10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 2016

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from                 to

Commission File Number 001-32108

Hornbeck Offshore Services, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	72-1375844
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

103 Northpark Boulevard, Suite 300

Covington, Louisiana 70433

(985) 727-2000

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of exchange, on which registered
Common Stock, $0.01 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  o    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  Yes o No x

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  o Accelerated filer  x Non-accelerated filer  o Smaller reporting company  o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes   ¨    No  x

The aggregate market value of the Common Stock held by non-affiliates computed by reference to the price at which the Common Stock was last sold as of the last day of registrant’s most recently completed second fiscal quarter is $286,306,654.

The number of outstanding shares of Common Stock as of January 31, 2017 is 36,466,840 shares.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive 2017 proxy statement, anticipated to be filed with the Securities and Exchange Commission within 120 days after the close of the Registrant’s fiscal year, are incorporated by reference into Part III of this Annual Report on Form 10-K.

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

FORM 10-K

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2016

TABLE OF CONTENTS

PART I		1
	Item 1—Business	1
	Item 1A—Risk Factors	15
	Item 1B—Unresolved Staff Comments	23
	Item 2—Properties	23
	Item 3—Legal Proceedings	24
	Item 4—Mine Safety Disclosures	24
PART II		25
	Item  5—Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer
	Purchases of Equity Securities	25
	Item 6—Selected Financial Data	26
	Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
	Item 7A—Quantitative and Qualitative Disclosures About Market Risk	44
	Item 8—Financial Statements and Supplementary Data	45
	Item 9—Changes in and Disagreements with Accountants on Accounting and Financial Disclosures	45
	Item 9A—Controls and Procedures	45
	Item 9B—Other Information	47
PART III		49
	Item 10—Directors, Executive Officers and Corporate Governance	49
	Item 11—Executive Compensation	49
	Item 12—Security Ownership of Certain Beneficial Owners and Management and Related
	Stockholder Matters	49
	Item 13—Certain Relationships and Related Transactions, and Director Independence	49
	Item 14—Principal Accounting Fees and Services	49
PART IV		50
	Item 15—Exhibits and Financial Statement Schedules	50
CONSOLIDATED FINANCIAL STATEMENTS		F - 1
SIGNATURES		S - 1
EXHIBIT INDEX		E - 1

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Forward Looking Statements

This Annual Report on Form 10-K contains “forward-looking statements,” as contemplated by the Private Securities Litigation Reform Act of 1995, in which the Company discusses factors it believes may affect its performance in the future. Forward-looking statements are all statements other than historical facts, such as statements regarding assumptions, expectations, beliefs and projections about future events or conditions. You can generally identify forward-looking statements by the appearance in such a statement of words like “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “remain,” “should,” “will,” or other comparable words or the negative of such words. The accuracy of the Company’s assumptions, expectations, beliefs and projections depends on events or conditions that change over time and are thus susceptible to change based on actual experience, new developments and known and unknown risks. The Company gives no assurance that the forward-looking statements will prove to be correct and does not undertake any duty to update them. The Company’s actual future results might differ from the forward-looking statements made in this Annual Report on Form 10-K for a variety of reasons, including sustained low or further declines in oil and natural gas prices; continued weakness in demand for the Company’s services through and beyond the maturity of any of the Company's long-term debt; unplanned customer suspensions, cancellations, rate reductions or non-renewals of vessel charters, vessel management contracts, or failures to finalize commitments to charter or manage vessels; sustained or further reductions in capital spending budgets by customers; the inability to accurately predict vessel utilization levels and dayrates; fewer than anticipated deepwater and ultra-deepwater drilling units operating in the GoM or other regions where the Company operates; the effect of inconsistency by the United States government in the pace of issuing drilling permits and plan approvals in the GoM or other drilling regions; the Company’s inability to successfully complete the remainder of its current vessel newbuild program on-time and on-budget, which involves the construction and integration of highly complex vessels and systems; the inability to successfully market the vessels that the Company owns, is constructing or might acquire; the government's cancellation or non-renewal of the management, operations and maintenance contracts for vessels; an oil spill or other significant event in the United States or another offshore drilling region that could have a broad impact on deepwater and other offshore energy exploration and production activities, such as the suspension of activities or significant regulatory responses; the imposition of laws or regulations that result in reduced exploration and production activities or that increase the Company’s operating costs or operating requirements; environmental litigation that impacts customer plans or projects; disputes with customers; bureaucratic, administrative or operating barriers that delay vessels in foreign markets from going on-hire or result in contractual penalties or deductions imposed by foreign customers; industry risks; the impact stemming from the reduction of Petrobras' announced plans for or administrative barriers to exploration and production activities in Brazil; recent disruption in Mexican offshore activities; age or other restrictions imposed on our vessels by customers; unanticipated difficulty in effectively competing in or operating in international markets; less than anticipated subsea infrastructure and field development demand in the GoM and other markets affecting our MPSVs; sustained vessel over capacity for existing demand levels in the markets in which the Company competes; economic and geopolitical risks; weather-related risks; upon a return to improved operating conditions, the shortage of or the inability to attract and retain qualified personnel, when needed, including vessel personnel for active vessels or vessels the Company may reactivate or acquire; any success in unionizing the Company's U.S. fleet personnel; regulatory risks; the repeal or administrative weakening of the Jones Act or adverse changes in the interpretation of the Jones Act related to the U.S. citizenship qualification; drydocking delays and cost overruns and related risks; vessel accidents, pollution incidents or other events resulting in lost revenue, fines, penalties or other expenses that are unrecoverable from insurance policies or other third parties; unexpected litigation and insurance expenses; fluctuations in foreign currency valuations compared to the U.S. dollar and risks associated with expanded foreign operations, such as non-compliance with or the unanticipated effect of tax laws, customs laws, immigration laws, or other legislation that result in higher than anticipated tax rates or other costs; the inability to repatriate foreign-sourced earnings and profits; or the inability of the Company to refinance or otherwise retire funded debt obligations that come

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due in 2019, 2020 and 2021. In addition, the Company’s future results may be impacted by adverse economic conditions, such as inflation, deflation, or lack of liquidity in the capital markets, that may negatively affect it or parties with whom it does business resulting in their non-payment or inability to perform obligations owed to the Company, such as the failure of customers to fulfill their contractual obligations or the failure by individual banks to provide funding under the Company’s credit agreement, if required. Further, the Company can give no assurance regarding when and to what extent it will effect common stock or note repurchases. Should one or more of the foregoing risks or uncertainties materialize in a way that negatively impacts the Company, or should the Company’s underlying assumptions prove incorrect, the Company’s actual results may vary materially from those anticipated in its forward-looking statements, and its business, financial condition and results of operations could be materially and adversely affected and, if sufficiently severe, could result in noncompliance with certain covenants of the Company's currently undrawn revolving credit facility. Additional factors that you should consider are set forth in detail in the “Risk Factors” section of this Annual Report on Form 10-K as well as other filings the Company has made and will make with the Securities and Exchange Commission which, after their filing, can be found on the Company’s website, www.hornbeckoffshore.com.

The Company makes references to certain industry-related terms in this Annual Report on Form 10-K. A glossary and definitions of such terms can be found in Item 9B—Other Information on page 47.

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PART I

ITEM 1—Business

COMPANY OVERVIEW

Hornbeck Offshore Services, Inc. was incorporated under the laws of the State of Delaware in 1997. In this Annual Report on Form 10-K, references to “Company,” “we,” “us,” “our” or like terms refer to Hornbeck Offshore Services, Inc. and its subsidiaries, except as otherwise indicated. Hornbeck Offshore Services, Inc. is a leading provider of marine transportation, subsea installation and accommodation support services to exploration and production, oilfield service, offshore construction and U.S. military customers. Since our establishment, we have primarily focused on providing innovative technologically advanced marine solutions to meet the evolving needs of the deepwater and ultra-deepwater energy industry in domestic and select foreign locations. Throughout our history, we have expanded our fleet of vessels primarily through a series of new vessel construction programs, as well as through acquisitions of existing vessels. We maintain our headquarters at 103 Northpark Boulevard, Suite 300, Covington, Louisiana, 70433; our telephone number is (985) 727-2000.

We own and operate one of the youngest and largest fleets of U.S.-flagged, new generation OSVs and MPSVs. In late 2011, we commenced our fifth OSV newbuild program, which also includes the construction of MPSVs. Since that time, we have grown our new generation fleet from 51 OSVs and four MPSVs to 62 OSVs and eight MPSVs, after accounting for the sale of five OSVs in 2014 and 2015. Upon completion of the last two vessels currently contracted to be delivered under this newbuild program in 2018, our expected fleet will be comprised of 62 OSVs and ten MPSVs. Together, these vessels support the deep-well, deepwater and ultra-deepwater activities of the offshore oil and gas industry. Such activities include oil and gas exploration, field development, production, construction, installation, IRM, well-stimulation and other enhanced oil recovery activities. We have also developed a specialized application of our new generation OSVs for use by the U.S. military. Our new generation OSVs and MPSVs have enhanced capabilities that allow us to more effectively support the premium drilling and installation equipment and facilities required for the offshore deep-well, deepwater and ultra-deepwater energy industry. We are one of the top two operators of domestic high-spec new generation OSVs and MPSVs and one of the top four operators of such equipment worldwide, based on DWT. Our fleet is among the youngest in the industry, with a weighted-average age, based on DWT, of eight years.

While we have historically operated our vessels predominately in the U.S. GoM, we have diversified our market presence and now operate in three core geographic markets: the GoM, Mexico and Brazil. In addition to our core markets, we frequently operate in other foreign regions on a project or term charter basis. We have recently operated in the Middle East, the Mediterranean Sea, the Black Sea and Latin America, including Nicaragua, Guyana, Trinidad and Argentina. We have further diversified by providing specialized vessel solutions to non-oilfield customers, such as the United States military as well as oceanographic research and other customers that utilize sophisticated marine platforms in their operations. In addition, we have provided vessel management services for other vessel owners, such as crewing, daily operational management and maintenance activities. We also operate a shore-base support facility located in Port Fourchon, Louisiana. See "Item 2-Properties" for a listing of our shoreside support facilities.

Although all of our vessels are physically capable of operating in both domestic and international waters, approximately 85% are qualified under Section 27 of the Merchant Marine Act of 1920, as amended, or the Jones Act, to engage in the U.S. coastwise trade. The two remaining vessels being constructed under our fifth OSV newbuild program will be eligible for Jones Act coastwise trading privileges. Foreign owned, flagged, built or crewed vessels are restricted in their ability to conduct U.S. coastwise trade and are typically excluded from such trade in the GoM. Of the public company OSV peer group, we own the largest fleet of Jones Act-qualified, new generation OSVs and MPSVs, which we believe offers us a competitive advantage in the GoM. From time to time, we may elect to reflag certain of our vessels to the flag of another nation. Since 2009, we have reflagged seven Jones Act-qualified OSVs to Mexican and other flags, including one under Brazilian registry. Once a Jones Act-qualified vessel is reflagged or a new vessel is foreign flagged, it permanently loses the right to engage in U.S. coastwise trade.

We intend to continue our efforts through up cycles and down cycles to maximize stockholder value through our long-term return-oriented growth strategy. We will, as opportunities arise, acquire or construct additional vessels, as well as divest certain assets that we consider to be non-core or otherwise not in line with our long-term strategy or prevailing industry trends.

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DESCRIPTION OF OUR BUSINESS

The Deepwater Offshore Energy Industry

The modern quest to explore for and produce energy resources located offshore began in the 1940’s. While these offshore operations began in shallow waters, relatively close to shore, technological advances have permitted them to migrate to ever deeper waters and well depths. Until the late 1970's, most offshore activity was technologically and logistically restricted to that which was accessible on the continental shelf, or waters of up to about 500 feet of depth. Since that time, a number of advances have opened drilling regions in deepwater. The initial push into deeper waters was facilitated through the development of “floating” drilling units that could be positioned over a drilling site without being fixed to the seafloor. Petrobras pioneered these techniques in Brazil beginning in the late 1970’s as it lacked an accessible “shallow water” continental shelf. The first deepwater project in the United States Gulf of Mexico was completed in 1993 in nearly 3,000 feet of water by Shell Oil Company. That Shell facility produced a then unheard of 46,000 barrels per day from a reservoir tapped at 25,000 feet. Today, exploration and production activities have pushed into the ultra-deepwater, where wells are routinely drilled in water depths of more than 8,000 feet, the deepest having been drilled in approximately 10,000 feet of water.

In addition to the ability to operate in very deepwater, technological advances have also allowed hydrocarbon resources to be detected, drilled for and produced at extreme well depths. “Pre-salt” discoveries in Brazil are being drilled and produced in waters exceeding 5,000 feet and at well depths of more than 35,000 feet. In 2014, Chevron announced first oil from its Jack/St. Malo facility in the GoM, which is expected to produce previously undetectable lower tertiary hydrocarbons at a rate of 94,000 barrels per day from deposits more than 20,000 feet below the seabed situated in 7,000 feet of water. In addition to contending with extreme deepwater and deep well depths, these projects present challenges involving high temperatures and pressures within reservoirs and the associated difficulties of safely bringing those resources to the surface and then transporting them to shoreside locations. Despite these challenges, today deepwater production accounts for approximately 80% percent of all offshore production in the United States. The GoM production is expected to account for 18% and 21% of total forecast U.S. crude oil production in 2016 and 2017.

Deepwater Regions

The energy industry has had success in many deepwater regions throughout the world. Deepwater drilling efforts are underway in the Mediterranean Sea, the Indian Ocean and Asia. However, the so-called “golden triangle” of deepwater activity is comprised of deposits found offshore West Africa, the Eastern coast of South America - dominated by Brazil and more recently, Guyana - and the GoM. Our core markets are the U.S. GoM, Mexico and Brazil.

As large international oil companies were pushed out of participating in many regions of the world by national oil companies intent upon retaining for themselves the economic benefits of national exploitation, the deepwater GoM grew in significance. The deepwater GoM is among the most abundant hydrocarbon regions in the world. Political stability in the United States and accessibility of deepwater lease blocks allows major oil companies to plan, execute and finance the significant long-term commitments that deepwater success requires. While the scale and complexity associated with deepwater projects is considerable, the significant size of the resource discoveries allows companies to replenish reserves on a large scale from relatively few projects. Unlike most on-shore exploration and production projects, deepwater projects require long-lead times to plan and execute, but also enjoy long production lives once online. For instance, the first exploratory wells at the Jack/St. Malo fields were drilled in 2003 and 2004 and first oil was not produced until 2014. Now online, Chevron projects that the Jack/St. Malo fields are expected to produce an estimated 500 million oil equivalent barrels over 30 years. Consequently, short term fluctuations in oil and gas prices typically do not have the same impact on sanctioned deepwater projects as such fluctuations may have on other on-shore and continental shelf projects. As a result of the severity and length of current on-going commodity price declines, some previously sanctioned deepwater projects have, nevertheless, been deferred and the pace of newly sanctioned projects in the deepwater GoM has slowed considerably since 2015.

Emerging opportunities for the deepwater offshore energy industry are presented by recent changes in Mexico and Brazil, two of our core markets, which have both recently expanded access to their deepwater regions to foreign operators. In December 2013, the Mexican congress ended PEMEX's 75 year-old monopoly on drilling activities in Mexico and voted in favor of allowing the government to grant contracts and licenses for exploration and production of oil and gas to foreign firms, which previously had been prohibited under Mexico’s constitution. During 2015, Mexico hosted the first two auctions for offshore oil and natural gas blocks allowed by the energy reforms. Drilling activities pursuant to these auctions will commence in 2017. In December 2016, Mexico conducted its first ever deepwater auctions, which drew bids from several major integrated oil companies on 10 deepwater opportunities. Eight blocks were awarded to

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companies including Exxon, CNOOC, Murphy Oil Company, Total, BHP and Chevron. Mexican officials have indicated their intention to proceed with additional deepwater auctions in 2017 and 2018.

Brazil, through its state-owned national oil company, Petrobras, has been a pioneer in deepwater drilling and remains a dominant player in the global deepwater energy industry. Petrobras claims approximately 13.3 billion barrels of proven deepwater and ultra-deepwater resources, the vast majority of which are located in pre-salt formations, which were the driving force behind an ambitious national plan to dramatically increase production by 2021 to 3.4 million barrels per day. These plans were sidelined by declines in the price of oil combined with a wide reaching corruption probe involving Petobras. In light of these difficulties being experienced by Petrobras, in 2016, the Brazilian Congress determined to re-open the vast Brazilian pre-salt regions to foreign operators.

The Subsea Oilfield

Deepwater successes have driven further innovation around the infrastructure required to produce and transport ashore the abundant resources that have been discovered. In shallower regions, once hydrocarbons are discovered, they are typically produced by installing a fixed platform over the well site onto which are installed all of the equipment and infrastructure necessary to produce the hydrocarbons and move them ashore through pipelines. Platforms also provide a locale from which well maintenance and similar activities can be performed. The size, pressures, temperatures and water depths of deepwater hydrocarbon deposits require enormous amounts of infrastructure to develop, produce and maintain their wells. These challenges have pushed the development of technologies to allow infrastructure to be placed directly onto the seafloor, as opposed to a fixed platform. The process of building out this subsea oilfield requires the use of vessels to transport infrastructure to location, install infrastructure to subsea points and inspect, repair and maintain it all over the multi-decade life of the field. When hydrocarbons are brought to the surface, they are brought from multiple subsea locations through pipelines to a single deepwater floating "top-side" production facility. These "top-side" production facilities take years to design, engineer, transport, install and, often, cost billions of dollars and represent a significant source of demand for vessel services during their installation and commissioning. More recently, deepwater producers have capitalized on their existing deepwater infrastructure to gain efficiencies through the use of so-called "tie-backs". A tie-back allows a deepwater well to be produced without having to install a new top-side facility by "tying the well back" to an existing top-side facility accessible to the well location. Tie-backs require the installation of subsea infrastructure to connect the well to the remote "top-side" facility.

Depiction of a GoM Subsea Deepwater Oilfield

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OSVs

OSVs primarily serve exploratory and developmental drilling rigs and production facilities and support offshore and subsea construction, installation, IRM and decommissioning activities. OSVs differ from other ships primarily due to their cargo-carrying flexibility and capacity. In addition to transporting deck cargo, such as pipe or drummed material and equipment, OSVs also transport liquid mud, potable and drilling water, diesel fuel, dry bulk cement and personnel between shore bases and offshore rigs and production facilities. Deepwater environments require OSVs with capabilities that allow them to more effectively support drilling and related subsea construction projects that occur far from shore, in deepwater and increasingly at extreme well depths. In order to best serve these projects, we have designed our various classes of new generation vessels in a manner that seeks to maximize their liquid mud and dry bulk cement capacities, as well as their larger areas of open deck space. Deepwater operations also require vessels having dynamic positioning, or anchorless station-keeping capability, driven primarily by safety concerns that preclude vessels from physically mooring to floating deepwater installations. DP systems have experienced steady increases in technology over time with the highest DP rating currently being DP-3. The number following the DP notation generally indicates the degree of redundancy built into the vessel’s systems and the range of usefulness of the vessel in deepwater construction and subsea operations. Higher numbers represent greater DP capabilities. Today, deepwater drilling operations in the GoM overwhelmingly prefer a DP-2 notation and a vessel with 2,500 DWT capacity or greater. We consider these vessels to be high-spec new generation OSVs. Currently, 54 of our vessels are DP-2 and two are DP-3. The two remaining MPSVs contracted to be constructed under our fifth OSV newbuild program are expected to be DP-2. Ultra-deepwater projects, which occur in waters of greater than 5,000 feet, are driving a need for DP-2 vessels with very large capacities. The distance of these projects from shore, together with their water and well depths dictate the use of massive volumes of bulk drilling materials and related supplies. The OSVs that have been delivered as part of our fifth OSV newbuild program are among the largest in the world. With DWT capacities of 5,500 DWT to 6,200 DWT, we believe these ultra high-spec vessels provide our ultra-deepwater drilling customers vessel solutions that help them to maximize efficiencies and improve the logistical challenges prevalent in their projects.

Vessels that do not carry a DP-2 notation or have less than 2,500 DWT capacity typically operate in more shallow U.S. waters or in foreign locations in which DP-2 has not yet emerged as the dominant standard. Currently, 18 of our vessels are low-spec, comprising 13% of our fleet by DWT. The remaining 87% of our fleet is considered high-spec, including roughly 60% of our overall fleet that is ultra high-spec.

Two ultra high-spec HOSMAX OSVs

MPSVs

MPSVs also support the deepwater activities of the energy industry. MPSVs are distinguished from OSVs in that they are more specialized and often significantly larger vessels that are principally used for IRM activities, such as the subsea installation of well heads, risers, jumpers, umbilicals and other equipment placed on the seafloor. MPSVs are also utilized in connection with the setting of pipelines, the commissioning and de-commissioning of offshore facilities, the maintenance and/or repair of subsea equipment and the intervention of such wells, well testing and flow-back operations and other sophisticated deepwater operations. To perform these various functions, MPSVs are or can be equipped with a variety of lifting and deployment systems, including large capacity cranes, winches or reel systems, well intervention equipment, ROVs and accommodation facilities. The typical MPSV is outfitted with one or more deepwater cranes

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employing active heave compensation technology, one or more ROVs and expansive accommodations for the offshore crew, including customer personnel. MPSVs can also be outfitted as a flotel to provide accommodations to large numbers of offshore construction and technical personnel involved in large-scale offshore projects, such as the commissioning of a floating offshore production facility. When in a flotel mode, the MPSV provides living quarters for personnel, catering, laundry, medical services, recreational facilities and offices. In addition, flotels coordinate and help to provide the facilities necessary for the offshore workers being accommodated to safely move from the vessel to other offshore structures being supported through the use of articulated gangways that allow personnel to "walk to work." Generally, MPSVs command higher day rates than OSVs due to their significantly larger relative size and versatility, as well as higher construction and operating costs.

370 class MPSVs

We have devised MPSVs that, in addition to the array of services described above, are also capable of being utilized to transport deck or bulk cargoes in capacities exceeding most other new generation OSVs. We own and operate two proprietary 370 class DP-2 new generation MPSVs with such capabilities. These MPSVs have approximately double the deadweight and three times the liquid mud barrel-capacity of one of our 265 class new generation OSVs and more than four times the liquid mud barrel-capacity of one of our 240 class new generation OSVs. Moreover, with their large tanks, these MPSVs have assisted in large volume deepwater well testing and flow-back operations, as well as supporting large drilling operations in remote or harsh conditions. Both of our 370 class MPSVs have certifications by the USCG that permit Jones Act-qualified operations as a supply vessel, industrial/construction vessel and as a petroleum and chemical tanker under subchapters “L”, “I”, “D”, and “O”, respectively. We believe that these vessels are not only the largest supply vessels in the world, but are also the only vessels in the world to have received all four of these certifications.

400 class and 310 class MPSVs

Until recently, due to a lack of Jones Act-qualified MPSVs, many customers would charter an OSV to carry equipment to location, which was then installed by a foreign flag MPSV. By eliminating the need for two vessels, we believe our customers will improve efficiencies and mitigate operational risks. Our Jones Act-qualified MPSVs are equipped with a heave-compensated knuckle-boom crane, helideck, accommodations for approximately 90-100 persons and are suitable for two or more work-class ROVs. Moreover, our Jones Act-qualified MPSVs are also equipped with below-deck cargo tanks, allowing them to expand their mission utility to include services more typically provided by OSVs.

In February 2016, we announced upgrades to the four remaining MPSVs under construction in our ongoing newbuild program. The modifications to the first two MPSVs, which were delivered in the third quarter of 2016, increased the berthing capacity, expanded the cargo-carrying capabilities and expanded the work area for ROVs. The modifications to the other two MPSVs will include the addition of a 60-foot mid-body plug, installation of an additional crane, increased berthing capacity, expanded cargo-carrying capacities and expanded work areas for ROVs. These two 400 class MPSVs are scheduled to be delivered in the first and third quarters of 2018. Because all four of these MPSVs are Jones Act-qualified, we expect that they will enable our customers to transport equipment from shore to the installation site to be installed by the MPSV without needing to use a second (domestic) vessel for transport like foreign-flagged MPSVs are required to do. We believe that, once delivered, the 400 class MPSVs will be the largest and most capable Jones Act-qualified MPSVs available in the market.

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Rendering of Planned HOS 400' Class MPSV

In April 2015, we also outfitted one of our 310 class OSVs that was placed in service under our ongoing newbuild program as a 310 class MPSV in flotel configuration. This U.S.-flagged, Jones Act-qualified MPSV includes a 35-ton knuckle-boom crane, a motion-compensated gangway and accommodations for 194 persons. Being Jones Act-qualified gives it mission flexibility that foreign flag flotels lack in the GoM.

430 class

We also operate the HOS Iron Horse and HOS Achiever, which are 430 class DP-3 new generation MPSVs. A DP-3 notation requires greater vessel and ship-system redundancies. DP-3 systems also include separate vessel compartments with fire-retardant walls for generators, prime movers, switchboards and most other DP components. These 430 class MPSVs are designed to handle a variety of global offshore energy applications, many of which are not dependent on the exploratory rig count. They are excellent platforms for those specialty services described above for our 400 and 310 class MPSVs with the exception of handling liquid cargoes. The HOS Iron Horse and the HOS Achiever are not U.S.-flagged vessels, however, they can engage in certain legally permissible operations in the U.S. that do not constitute coastwise trade. The HOS Achiever is currently configured as a flotel with accommodations for up to 270 personnel onboard, including the vessel's marine crew, hotel and catering staff. These accommodations allow this vessel to support the commissioning of deepwater installations around the world. Because flotel services do not typically involve the transportation of passengers, foreign-flag vessels, such as our 430 class MPSVs, can provide this service in the U.S.

We believe that our reputation for safety and technologically superior vessels, combined with our size and scale in certain core markets relative to our public company OSV peer group, enhance our ability to compete for work awarded by major oil companies, independent oil companies, national oil companies and the U.S. government, who are among our primary customers. These customers demand a high level of safety and technological advancements to meet the more stringent regulatory standards in the GoM. As our customers’ needs and requirements become more demanding, we expect that smaller vessel operators may struggle to meet these standards.

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The following table provides information, as of February 15, 2017, regarding our owned fleet of 62 new generation OSVs, eight MPSVs and two MPSVs yet to be delivered under our fifth OSV newbuild program, as well as our managed fleet of four new generation OSVs that serve the U.S. Navy.

Our Vessels

Name	Design	Current Service Function	Current Location	In-Service Date	Deadweight (long tons)	Liquid Mud Capacity (barrels)	Total Horsepower	DP Class(1)
OWNED VESSELS:
MPSVs
HOS Iron Horse	430	Multi-Purpose (FF)	Latin America	Nov 2009	5,908	n/a	8,050	DP-3
HOS Achiever	430	Stacked (FF)	GoM	Oct 2008	5,096	n/a	8,050	DP-3
HOS Warhorse	400ES	Multi-Purpose	TBD	1Q2018 est.(2)	6,200 est	14,100 est.	9,000 est.	DP-2
HOS Wild Horse	400ES	Multi-Purpose	TBD	3Q2018 est.(2)	6,200 est.	14,100 est.	9,000 est.	DP-2
HOS Centerline	370	Multi-Purpose	GoM	Mar 2009	7,903	30,962	6,000	DP-2
HOS Strongline	370	Multi-Purpose	GoM	Mar 2010	7,881	30,962	6,000	DP-2
HOS Bayou	310	Multi-Purpose	GoM	Dec 2014	5,189	20,981	7,300	DP-2
HOS Warland	310ES	Multi-Purpose	GoM	Aug 2016	4,997	19,120	9,000	DP-2
HOS Woodland	310ES	Multi-Purpose	GoM	Sep 2016	5,067	19,120	9,000	DP-2
HOS Riverbend	300	Stacked	GoM	Feb 2014	4,529	16,938	7,300	DP-2
OSVs
300 class (Over 5,000 DWT)
HOS Commander	320	Supply	Latin America	Nov 2013	6,046	20,911	6,008	DP-2
HOS Carolina	320	Supply	GoM	Feb 2014	6,059	20,911	6,008	DP-2
HOS Claymore	320	Supply	GoM	Mar 2014	6,042	20,911	6,008	DP-2
HOS Captain	320	Supply	GoM	Jul 2014	6,051	20,911	6,008	DP-2
HOS Clearview	320	Stacked	GoM	Aug 2014	6,053	20,911	6,008	DP-2
HOS Crockett	320	Supply	GoM	Dec 2014	6,047	20,911	6,008	DP-2
HOS Caledonia	320	Supply	GoM	Jan 2015	6,066	20,911	6,008	DP-2
HOS Crestview	320	Stacked	GoM	Feb 2015	6,052	20,911	6,008	DP-2
HOS Cedar Ridge	320	Supply	GoM	Nov 2015	6,046	20,911	6,008	DP-2
HOS Carousel	320	Stacked	GoM	Jun 2015	6,059	20,911	6,008	DP-2
HOS Black Foot	310	Supply	GoM	Jul 2014	6,055	21,417	7,300	DP-2
HOS Black Rock	310	Stacked	GoM	Aug 2014	6,055	21,417	7,300	DP-2
HOS Black Watch	310	Supply	GoM	Oct 2014	6,055	21,417	7,300	DP-2
HOS Brass Ring	310	Supply (FF)	Latin America	Jan 2016	5,633	21,417	6,700	DP-2
HOS Briarwood	310	Stacked	GoM	Jan 2016	5,350	21,417	6,700	DP-2
HOS Red Dawn	300	Supply	GoM	Jun 2013	5,407	20,846	6,700	DP-2
HOS Red Rock	300	Supply	GoM	Oct 2013	5,407	20,846	6,700	DP-2
HOS Renaissance	300	Supply	GoM	Nov 2013	5,407	20,846	6,700	DP-2
HOS Coral	290	Supply	GoM	Mar 2009	5,609	15,212	6,140	DP-2
280 class (3,500 to 5,000 DWT)
HOS Ridgewind	265	Supply	Middle East	Nov 2001	2,928	9,414	6,780	DP-2
HOS Brimstone	265	Stacked	GoM	Jun 2002	3,718	10,350	6,780	DP-2
HOS Stormridge	265	Stacked	GoM	Aug 2002	3,659	10,350	6,780	DP-2
HOS Sandstorm	265	Stacked	GoM	Oct 2002	3,659	10,336	6,780	DP-2
240 class (2,500 to 3,500 DWT)
HOS Saylor	240	Stacked (FF)	GoM	Oct 1999	2,774	n/a	7,844	DP-1
HOS Navegante	240	Stacked (FF)	GoM	Jan 2000	3,289	4,450	7,844	DP-2
HOS Resolution	250 EDF	Stacked	GoM	Oct 2008	2,751	8,240	6,000	DP-2
HOS Mystique	250 EDF	Stacked	GoM	Jan 2009	2,333	8,300	5,586	DP-2
HOS Pinnacle	250 EDF	Stacked	GoM	Feb 2010	2,707	8,240	6,000	DP-2
HOS Windancer	250 EDF	Stacked	GoM	May 2010	2,724	8,240	6,000	DP-2
HOS Wildwing	250 EDF	Stacked	GoM	Sept 2010	2,707	8,240	6,000	DP-2
HOS Bluewater	240 ED	Stacked	GoM	Mar 2003	2,754	8,270	4,000	DP-2
HOS Gemstone	240 ED	Stacked	GoM	Jun 2003	2,758	8,270	4,000	DP-2
HOS Greystone	240 ED	Stacked	GoM	Sep 2003	2,754	8,270	4,000	DP-2
HOS Silverstar	240 ED	Stacked	GoM	Jan 2004	2,762	8,270	4,000	DP-2
HOS Polestar	240 ED	Stacked	GoM	May 2008	2,752	8,270	4,000	DP-2
HOS Shooting Star	240 ED	Stacked	GoM	Jul 2008	2,728	8,270	4,000	DP-2
HOS North Star	240 ED	Stacked	GoM	Nov 2008	2,749	8,270	4,000	DP-2
HOS Lode Star	240 ED	Stacked	GoM	Feb 2009	2,746	8,270	4,000	DP-2
HOS Silver Arrow	240 ED	Supply	Other U.S.	Oct 2009	2,666	8,270	4,000	DP-2
HOS Sweet Water	240 ED	Stacked	GoM	Dec 2009	2,707	8,270	4,000	DP-2

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Name	Design	Current Service Function	Current Location	In-Service Date	Deadweight (long tons)	Liquid Mud Capacity (barrels)	Total Horsepower	DP Class(1)
HOS Beignet	S240 E	Stacked	GoM	May 2013(3)	2,772	8,000	4,000	DP-2
HOS Boudin	S240 E	Stacked	GoM	May 2013(3)	2,715	8,000	4,000	DP-2
HOS Bourre'	S240 E	Stacked	GoM	Sep 2013(3)	2,772	8,000	4,000	DP-2
HOS Coquille	S240 E	Stacked	GoM	Sep 2013(3)	2,742	8,000	4,000	DP-2
HOS Cayenne	S240 E	Stacked	GoM	Nov 2013(3)	2,772	8,000	4,000	DP-2
HOS Chicory	S240 E	Stacked	GoM	Nov 2013(3)	2,731	8,000	4,000	DP-2
200 class (1,500 to 2,500 DWT)
HOS Innovator	240 E	Stacked	GoM	Apr 2001	2,036	6,290	4,520	DP-2
HOS Dominator	240 E	Military	Other U.S.	Feb 2002	2,054	6,400	4,000	DP-2
HOS Deepwater	240	Stacked (FF)	Mexico	Nov 1999	2,259	4,470	4,000	DP-1
HOS Cornerstone	240	Stacked	GoM	Mar 2000	2,259	6,280	4,000	DP-2
HOS Beaufort	S200	Stacked	GoM	Mar 1999	2,246	4,120	4,000	DP-1
HOS Hawke	S200	Stacked (FF)	GoM	Jul 1999	1,767	4,100	4,000	DP-1
HOS Douglas	S200	Stacked	GoM	Apr 2000	2,246	4,120	4,000	DP-1
HOS Nome	S200	Stacked	GoM	Aug 2000	2,246	4,120	4,000	DP-1
HOS Crossfire	200	Stacked (FF)	Mexico	Nov 1998	1,780	2,714	4,000	DP-1
HOS Super H	200	Stacked	GoM	Jan 1999	1,764	3,590	4,000	DP-1
HOS Brigadoon	200	Stacked (FF)	Mexico	Mar 1999	1,767	3,590	4,000	DP-1
HOS Thunderfoot	200	Supply (FF)	Mexico	May 1999	1,677	3,600	4,000	DP-1
HOS Dakota	200	Stacked (FF)	Mexico	Jun 1999	1,780	2,714	4,000	DP-1
HOS Explorer	220	Stacked	GoM	Feb 1999	1,625	3,050	3,900	DP-1
HOS Voyager	220	Stacked	GoM	May 1998	1,625	3,050	3,900	DP-1
HOS Pioneer	220	Stacked	GoM	Jun 2000	1,630	3,050	4,000	DP-1
MANAGED VESSELS:
240 class (2,500 to 3,500 DWT)
Black Powder	250 EDF	Military	Other U.S.	Jun 2009	2,900	8,300	6,000	DP-2
Westwind	250 EDF	Military	Other U.S.	Jun 2009	2,900	8,300	6,000	DP-2
Eagleview	250 EDF	Military	Other U.S.	Oct 2009	2,900	8,300	6,000	DP-2
Arrowhead	250 EDF	Military	Other U.S.	Jan 2009	2,900	8,300	6,000	DP-2

FF—foreign-flagged

TBD—to be determined

⁽¹⁾  “DP-1,” “DP-2” and “DP-3” mean various classifications, or equivalent, of dynamic positioning systems on new generation vessels to automatically maintain a vessel’s position and heading through anchor-less station keeping.

⁽²⁾  These vessels are currently being constructed under our fifth OSV newbuild construction program with anticipated in-service dates during 2018.

⁽³⁾  These six vessels were converted into 240 class DP-2 OSVs as part of our 200 class OSV retrofit program in 2013. They were originally constructed and placed in service in their prior Super 200 class DP-1 configuration in 1999 or 2000 and were acquired by us in August 2007.

We own long-term lease rights to two adjacent shore-base facilities located in Port Fourchon, Louisiana, named HOS Port. Port Fourchon’s proximity to the deepwater GoM provides a strategic logistical advantage for servicing drilling rigs, production facilities and other offshore installations and sites. We also utilize HOS Port as a shoreside facility for performing vessel maintenance, outfitting and other in-the-water shipyard activities. Developed as a multi-use facility, Port Fourchon has historically been a land base for offshore oil support services and the Louisiana Offshore Oil Port, or LOOP. According to industry sources, Port Fourchon services nearly all deepwater rigs and almost half of all shallow water rigs in the GoM. The HOS Port facility has approximately two years remaining on its current leases and three additional five-year renewal options on each parcel. The combined acreage of HOS Port is approximately 60 acres with total waterfront bulkhead of nearly 3,000 linear feet. HOS Port not only supports our existing fleet and customers’ deepwater logistics requirements, but it underscores our long-term commitment to and our long-term outlook for the deepwater GoM.

Principal Markets

OSVs and MPSVs operate worldwide, but are generally concentrated in relatively few offshore regions with high levels of exploration and development activity, such as the GoM, the North Sea, Southeast Asia, West Africa, Latin America, and the Middle East. Our core geographic markets are the GoM, Mexico and Brazil. In these markets we provide services to several major integrated oil companies as well as mid-size and large independent oil companies with deepwater and ultra-deepwater activities and to national oil companies such as PEMEX and Petrobras. We also occasionally operate in select international markets, which have included the rest of Latin America, West Africa, the Mediterranean Sea, the Black Sea and the Caribbean basin. We are often subcontracted by other oilfield service companies, both in the GoM and internationally, to provide a new generation fleet that enables them to render offshore oilfield services, such as well stimulation or other enhanced oil recovery activities, diving and ROV operations, construction, installation, inspection, maintenance, repair and decommissioning services. We also provide a specialized application of our new generation OSVs for use by the United States military.

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While there is some vessel migration between regions, key factors such as mobilization costs, vessel suitability and government statutes prohibiting foreign-flagged vessels from operating in certain waters, or coastwise cabotage laws such as the Jones Act, can limit the migration of OSVs. Because some MPSVs are generally utilized for non-cargo operations, they are less limited by cabotage laws. Demand for OSVs, as evidenced by dayrates and utilization rates, is primarily related to offshore oil and natural gas exploration, development and production activity. Such activity is influenced by a number of factors, including the actual and forecasted price of oil and natural gas, the level of drilling permit activity, capital budgets of offshore exploration and production companies, and repair and maintenance needs in the deepwater oilfield.

Offshore exploration and production activities are increasingly focused on deep wells (as defined by total well depth rather than water depth), whether on the Outer Continental Shelf or in the deepwater or ultra-deepwater. These types of wells require high-specification equipment, which has driven the recent and nearly completed newbuild cycle for drilling rigs and for OSVs. There were 47 floating rigs under construction or on order on February 15, 2017 and, as of that date, there were options outstanding to build 10 additional floating rigs. In addition, on that date, there were 102 high-spec jack-up rigs under construction or on order worldwide, and there were options outstanding to build 14 additional high-spec jack-up rigs. Most, if not all, of these rigs were ordered prior to the downturn in oil prices that has persisted since late 2014. Consequently, the market for deepwater drilling rigs is expected to be over-supplied for the forseeable future. This oversupply of rigs may drive down the cost of contracting a drilling rig, with the result that more rigs are employed, which could positively impact utilization of supply vessels. Each drilling rig working on deep-well projects typically requires more than one OSV to service it, and the number of OSVs required is dependent on many factors, including the type of activity being undertaken, the location of the rig and the size and capacity of the OSVs. During normal operating conditions, based on the historical data for the number of floating rigs and OSVs working, we believe that two to four OSVs per rig are required in the GoM and even more OSVs are necessary per rig in Brazil where greater logistical challenges result in longer vessel turnaround times to service drill sites. Typically, during the initial drilling stage, more OSVs are required to supply drilling mud, drill pipe and other materials than at later stages of the drilling cycle. In addition, generally more OSVs are required the farther a drilling rig is located from shore. Under normal weather conditions, the transit time to deepwater drilling rigs in the GoM and Brazil can typically range from six to 24 hours for a new generation vessel. In Brazil, transit time for a new generation vessel to some of the newer, more logistically remote deepwater drilling rig locations are more appropriately measured in days, not hours. In addition to drilling rig support, deepwater and ultra-deepwater exploration and production activities should result in the expansion of other specialty-service offerings for our vessels. These markets include subsea construction support, installation, IRM work, and life-of-field services, which include well-stimulation, workovers and decommissioning.

Our charters are the product of either direct negotiation or a competitive proposal process, which evaluates vessel capability, availability and price. Our primary method of chartering in the GoM is through direct vessel negotiations with our customers on either a long-term or spot basis. In the international market, we sometimes charter through local entities in order to comply with cabotage or other local requirements. Some charters are solicited by customers through international vessel brokerage firms, which earn a commission that is customarily paid by the vessel owner. Our operations and management agreement with the U.S. Navy's Military Sealift Command was a sole source selection based upon certain capabilities unique to the Company that were developed while the applicable vessels were chartered to the Navy. All of our charters, whether long-term or spot, are priced on a dayrate basis, whereby for each day that the vessel is under contract to the customer, we earn a fixed amount of charter-hire for making the vessel available for the customer’s use. Many long-term contracts and all government, including national oil company, charters contain early termination options in favor of the customer; however, some have fees designed to discourage early termination. Long-term charters sometimes contain provisions that permit us to increase our dayrates in order to be compensated for certain increased operational expenses or regulatory changes.

Competition

The offshore support vessel industry is highly competitive. Competition primarily involves such factors as:

• quality, capability and age of vessels;

• quality, capability and nationality of the crew members;

• ability to meet the customer’s schedule;

• safety record, reputation, experience and;

• price.

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Our high-spec OSVs are predominately U.S.-flagged vessels, which qualify them under the Jones Act to engage in domestic coastwise trade. The Jones Act restricts the ability of vessels that are foreign-built, foreign-owned, foreign-crewed or foreign-flagged from engaging in coastwise trade in the United States. The transportation services typically provided by OSVs constitute coastwise trade as defined by the Jones Act. See "Item 1A-Risk Factors" for a more detailed discussion of the Jones Act. Consequently, competition for our services in the GoM is largely restricted to other U.S. vessel owners and operators, both publicly and privately held. We believe that we operate the second largest fleet by DWT of new generation Jones Act-qualified OSVs in the United States. Internationally, our OSVs compete against other U.S. owners, as well as foreign owners and operators of OSVs. Some of our international competitors may benefit from a lower cost basis in their vessels, which are usually not constructed in U.S. shipyards, as well as from lower crewing costs and favorable tax regimes. While foreign vessel owners cannot engage in U.S. coastwise trade, some cabotage laws in other parts of the world permit temporary waivers for foreign vessels if domestic vessels are unavailable. We and other U.S. and foreign vessel owners have been able to obtain such waivers in the foreign jurisdictions in which we operate.

Many of the services provided by MPSVs do not involve the transportation of merchandise and therefore are generally not considered coastwise trade under U.S. and foreign cabotage laws. Consequently, our MPSVs face, and the HOSMAX MPSVs being constructed under our fifth OSV newbuild program will face, competition from both foreign-flagged vessels and U.S.-flagged vessels for non-coastwise trade activities. However, because our MPSVs will be Jones Act-qualified, we believe our customers will achieve greater efficiency as our MPSVs will eliminate the need for customers to separately charter a Jones Act-qualified vessel to transport project cargo from a U.S. point to an installation site. In addition, our U.S.-flagged MPSVs will compete for projects with other international MPSVs as well as participate in the GoM and international OSV markets as large-capacity carriers of drilling fluids, petroleum products and deck cargos in support of deep-well exploration, development and production operations. Competition in the MPSV industry is significantly affected by the particular capabilities of a vessel to meet the requirements of a customer’s project. While operating in the GoM, our foreign-flagged DP-3 MPSVs are required to utilize U.S. crews while foreign-owned vessels have historically been allowed to employ non-U.S. mariners, often from low-wage nations. U.S. crews are often more expensive than foreign crews. Also, foreign MPSV owners may have more favorable tax regimes than ours. Consequently, prices for foreign-owned MPSVs in the GoM are often lower than prices we can charge. Finally, some potential MPSV customers are also owners of MPSVs that will compete with our vessels. However, we have, for some time, observed a clear preference by our customers for a “one-stop” Jones Act solution, which would provide improved efficiencies, derived from a single U.S.-flagged vessel as well as greater regulatory certainty as compliance questions continue to arise from the use of foreign-flagged vessels in the subsea GoM. In the post-Macondo GoM, we see this Jones Act preference as a long-term trend, not only for construction vessels but for vessels of all types working offshore.

We continue to observe intense scrutiny by our customers on the safety and environmental management systems of vessel operators. As a consequence, we believe that deepwater customers are increasingly biased towards companies that have demonstrated a financial and operational commitment and capacity to employ such systems. We believe this trend will, over time, make it difficult for small enterprises to compete effectively in the deepwater OSV and MPSV markets. Additionally, we have observed less willingness by operators to utilize DP-1 vessels in deepwater operations in the GoM. This trend will likely result in the retirement of non-DP vessels and a migration of DP-1 vessels to non-deepwater regions, such as the shelf, and certain international regions.

Although some of our principal competitors are larger or have more extensive international operations than we do, we believe that our financial strength, operating capabilities and reputation for quality and safety enable us to compete effectively with other fleets in the market areas in which we operate or intend to operate. In particular, we believe that the relatively young age and advanced features of our OSVs and MPSVs provide us with a competitive advantage. The ages of our high-spec new generation OSVs range from one year to 18 years with a weighted-average fleet age, based on DWT, of five years. In fact, approximately 80% of our active new generation OSVs have been placed in-service since January 1, 2008. The average age of the industry’s conventional U.S.-flagged OSV fleet is over 35 years and the industry's domestic new generation OSV fleet is approximately nine years. We believe that most of these older vessels are cold-stacked and many of them have been or will be permanently retired in the next few years due to physical and economic obsolescence. Worldwide competition for new generation vessels has been impacted in recent years by the increase in newbuild OSVs placed in-service to address greater customer interest in deep-well, deepwater and ultra-deepwater drilling activity and the decline in industry activity due to low oil prices. Upon completion of our fifth OSV newbuild program, we expect to own a fleet of 72 Upstream vessels of which 81% will be DP-2 or DP-3 with a weighted-average fleet age, based on DWT, of nine years in 2018.

Our success depends in large part on our ability to attract and retain highly skilled and qualified personnel. Our inability to hire, train and retain a sufficient number of qualified employees could impact our ability to manage, maintain

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and grow our business. In crewing our vessels, we require skilled employees who can perform physically demanding work and operate complex vessel systems. As the result of our vessel stacking strategy, we have reduced our mariner headcount significantly. When these stacked vessels return to service, we will need to hire and train additional mariners to operate such vessels.

CUSTOMER DEPENDENCY

Our customers are generally limited to large, independent, integrated or nationally-owned energy companies. These firms are relatively few in number. The percentage of revenues attributable to a customer in any particular year depends on the level of oil and natural gas exploration, development and production activities undertaken by such customer, the availability and suitability of our vessels for the customer’s projects or products and other factors, many of which are beyond our control. For the year ended December 31, 2016, Royal Dutch Shell plc (including worldwide affiliates), Military Sealift Command and Hess Corporation each accounted for 10% or more of our consolidated revenues. For a discussion of significant customers in prior periods, see Note 13 to our consolidated financial statements.

GOVERNMENT REGULATION

Environmental Laws and Regulations

Our operations are subject to a variety of federal, state, local and international laws and regulations regarding the discharge of materials into the environment or otherwise relating to environmental protection. The requirements of these laws and regulations have become more complex and stringent in recent years and may, in certain circumstances, impose strict liability, rendering a company liable for environmental damages and remediation costs without regard to negligence or fault on the part of such party. Aside from possible liability for damages and costs including natural resource damages associated with releases of oil or hazardous materials into the environment, such laws and regulations may expose us to liability for the conditions caused by others or even acts of ours that were in compliance with all applicable laws and regulations at the time such acts were performed. Failure to comply with applicable laws and regulations may result in the imposition of administrative, civil and criminal penalties, revocation of permits, issuance of corrective action orders and suspension or termination of our operations. Moreover, it is possible that future changes in the environmental laws, regulations or enforcement policies that impose additional or more restrictive requirements or claims for damages to persons, property, natural resources or the environment could result in substantial costs and liabilities to us and could have a material adverse effect on our financial condition, results of operations or cash flows. We have performed what we consider to be appropriate environmental due diligence in connection with our operations and, where possible, we have taken all necessary steps to qualify for any applicable statutory defenses and limits of liability available under environmental regulations. We believe that we are in substantial compliance with currently applicable environmental laws and regulations.

OPA 90 and regulations promulgated pursuant thereto amend and augment the oil spill provisions of the Clean Water Act and impose a variety of duties and liabilities on “responsible parties” related to the prevention and/or reporting of oil spills and damages resulting from such spills in or threatening U.S. Waters, including the Outer Continental Shelf or adjoining shorelines. A “responsible party” includes the owner or operator of an onshore facility, pipeline or vessel or the lessee or permittee of the area in which an offshore facility is located. OPA 90 assigns liability to each responsible party for containment and oil removal costs, as well as a variety of public and private damages including the costs of responding to a release of oil, natural resource damages, damages for injury to, or economic losses resulting from, destruction of real or personal property of persons who own or lease such affected property. For any vessels, other than “tank vessels,” that are subject to OPA 90, the liability limits are the greater of $1,100 per gross ton or $939,800. A party cannot take advantage of liability limits if the spill was caused by gross negligence or willful misconduct or resulted from violation of a federal safety, construction or operating regulation. In addition, for vessels carrying crude oil from a well situated on the Outer Continental Shelf, the limits apply only to liability for damages (e.g. natural resources, real or personal property, subsistence use, reserves, profits and earnings capacity, and public services damages). The owner or operator of such vessel is liable for all removal costs resulting from a discharge without limits. If the party fails to report a spill or to cooperate fully in the cleanup, the liability limits likewise do not apply and certain defenses may not be available. Moreover, OPA 90 imposes on responsible parties the need for proof of financial responsibility to cover at least some costs in a potential spill. As required, we have provided satisfactory evidence of financial responsibility to the USCG for all of our vessels over 300 tons.

OPA 90 also imposes ongoing requirements on a responsible party, including preparedness and prevention of oil spills and preparation of an oil spill response plan. We have engaged the Marine Spill Response Corporation to serve as our Oil Spill Removal Organization for purposes of providing oil spill removal resources and services for our operations in

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U.S. waters as required by the USCG. In addition, our Tank Vessel Response Plan and Non-Tank Vessel Response Plan have been approved by the USCG.

The Clean Water Act imposes strict controls on the discharge of pollutants into the navigable waters of the United States. The Clean Water Act also provides for civil, criminal and administrative penalties for any unauthorized discharge of oil or other hazardous substances in reportable quantities and imposes liability for the costs of removal and remediation of an unauthorized discharge, including the costs of restoring damaged natural resources. Many states have laws that are analogous to the Clean Water Act and also require remediation of accidental releases of petroleum in reportable quantities. Our OSVs routinely transport diesel fuel to offshore rigs and platforms and also carry diesel fuel for their own use. Our OSVs also transport bulk chemical materials used in drilling activities and liquid mud, which contain oil and oil by-products. We maintain vessel response plans as required by the Clean Water Act to address potential oil and fuel spills.

The Comprehensive Environmental Response, Compensation, and Liability Act of 1980, also known as “CERCLA” or “Superfund,” and similar laws impose liability for releases of hazardous substances into the environment. CERCLA currently exempts crude oil from the definition of hazardous substances for purposes of the statute, but our operations may involve the use or handling of other materials that may be classified as hazardous substances. CERCLA assigns strict liability to each responsible party for response costs, as well as natural resource damages. Under CERCLA, responsible parties include not only owners and operators of vessels but also any person who arranged for the disposal or treatment, or arranged with a transporter for transport for disposal or treatment of hazardous substances, and any person who accepted hazardous substances for transport to disposal or treatment facilities. Thus, we could be held liable for releases of hazardous substances that resulted from operations by third parties not under our control or for releases associated with practices performed by us or others that were standard in the industry at the time.

The Resource Conservation and Recovery Act regulates the generation, transportation, storage, treatment and disposal of onshore hazardous and non-hazardous wastes and requires states to develop programs to ensure the safe treatment, storage and disposal of wastes. We generate non-hazardous wastes and small quantities of hazardous wastes in connection with routine operations. We believe that all of the wastes that we generate are handled in all material respects in compliance with the Resource Conservation and Recovery Act and analogous state statutes.

The USCG's final Ballast Rule became effective on June 21, 2012, and the EPA renewed the Vessel General Permit under the National Pollutant Discharge Elimination System on December 19, 2013. In addition, the International Maritime Organization, or IMO, ratified the International Convention for the Control and Management of Ships’ Ballast Water and Sediments on September 8, 2016, otherwise known as the Ballast Water Management Convention, or BWMC. The BWMC has similar standards to that of the USCG and EPA ballast water regulations and will enter into force on September 8, 2017. These regulations require all our existing vessels to meet certain standards pertaining to ballast water discharges. An exemption to certain compliance requirements in the U.S. is provided for vessels that operate within an isolated geographic region, as determined by the USCG. Most of our vessels operating in the GoM are exempt from the ballast water treatment requirements. However, for non-exempt vessels, ballast water treatment equipment may be required to be utilized on the vessel. In late 2016, the USCG approved certain types of ballast water treatment systems and, as a result, we will have to become compliant with ballast water treatment requirements that previously were waived in the U.S. Internationally, compliance with IMO’s BWMC is not expected to impact us until 2018, as implementation of these rules is based on the renewal of a vessel’s International Oil Pollution Prevention Certificate after September 8, 2017. We have currently estimated the cost of compliance with either the USCG's Ballast Rule or the BWMC to be approximately $250,000 per vessel that is required to be fitted with a treatment system. 

The Clean Air Act, or CAA, passed by Congress in 1970 regulates all air pollutants resulting from industrial activities. The 1990 amendments to the CAA established jurisdiction of offshore regions. Proposed and existing facilities and vessels must prepare, as part of their development plans and reporting procedures, detailed emissions data to prove compliance with the CAA and obtain necessary permits. We believe that all of our facilities and vessels have obtained the necessary permits and are operating in all material respects in compliance with the CAA. The EPA also imposed emissions regulations affecting vessels that operate in the United States. These regulations impose standards that may require modifications to our vessels at a cost that we have as yet been unable to estimate. Moreover, the EPA’s decision to regulate “greenhouse gases” as a pollutant may result in further regulations and compliance costs.

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Climate Change

Greenhouse gas emissions have increasingly become the subject of international, national, regional, state and local attention. The EPA has adopted regulations under the Clean Air Act that require new and existing industrial facilities to obtain permits for carbon dioxide equivalent emissions above emission thresholds. In addition, the EPA adopted rules that mandate reporting of greenhouse gas data and other information by i) industrial sources, ii) suppliers of certain products, and iii) facilities that inject carbon dioxide underground. To the extent that these regulations may apply, we could be responsible for costs associated with complying with such regulations. Cap and trade initiatives to limit greenhouse gas emissions have been introduced in the European Union. Similarly, in prior years, numerous bills related to climate change have been introduced in the U.S. Congress, which could adversely impact most industries. In addition, future regulation of greenhouse gas could occur pursuant to future treaty obligations, statutory or regulatory changes or new climate change legislation in the jurisdictions in which we operate. It is uncertain whether any of these initiatives will be implemented. However, based on published media reports, we believe that it is unlikely that the current proposed initiatives in the U.S. will be implemented without substantial modification. If such initiatives are implemented, we do not believe that such initiatives would have a direct, material adverse effect on our operating results.

Restrictions on greenhouse gas emissions or other related legislative or regulatory enactments could have an effect in those industries that use significant amounts of petroleum products, which could potentially result in a reduction in demand for petroleum products and, consequently and indirectly, our offshore transportation and support services. We are currently unable to predict the manner or extent of any such effect. Furthermore, one of the asserted long-term physical effects of climate change may be an increase in the severity and frequency of adverse weather conditions, such as hurricanes, which may increase our insurance costs or risk retention, limit insurance availability or reduce the areas in which, or the number of days during which, our customers would contract for our vessels in general and in the GoM in particular. We are currently unable to predict the manner or extent of any such effect.

EMPLOYEES

On December 31, 2016, we had 797 employees, including 611 operating personnel and 186 corporate, administrative and management personnel. Excluded from these personnel totals are 78 third-country nationals that we contracted to serve on our vessels as of December 31, 2016. These non-U.S. mariners are typically provided by international crewing agencies. With the exception of 85 employees located in Brazil and Mexico, none of our employees are represented by a union or employed pursuant to a collective bargaining agreement or similar arrangement. We have not experienced any strikes or work stoppages, and our management believes that we continue to experience good relations with our employees.

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GEOGRAPHIC AREAS

The table below presents revenues by geographic region for the past three fiscal years (in thousands):

	Year Ended December 31,
	2016		2015		2014
United States	$	185,475	$	328,262	$	490,314
International	38,824		147,808		144,479
	$	224,299	$	476,070	$	634,793

The table below presents net property, plant and equipment by geographic region for the past three fiscal years (in thousands):

	December 31,
	2016		2015		2014
United States	$	2,250,384	$	2,218,646	$	2,052,145
International	328,004		356,015		407,341
	$	2,578,388	$	2,574,661	$	2,459,486

Foreign Operations

Operating in foreign markets presents many political, social and economic challenges. Although we take measures to mitigate these risks, they cannot be completely eliminated. See "Item—1A Risk Factors" for a further discussion of the risks of operating in foreign markets.

SEASONALITY

Demand for our offshore support services is directly affected by the levels of offshore drilling and production activity. Budgets of many of our customers are based upon a calendar year, and demand for our services has historically been stronger in the second and third calendar quarters when allocated budgets are expended by our customers and weather conditions are more favorable for offshore activities. Many other factors, such as the expiration of drilling leases and the supply of and demand for oil and natural gas, may affect this general trend in any particular year. In addition, we typically have an increase in demand for our vessels to survey and repair offshore infrastructure immediately following major hurricanes or other named storms in the GoM.

WEBSITE AND OTHER ACCESS TO COMPANY REPORTS AND OTHER MATERIALS

Our website address is http://www.hornbeckoffshore.com. We make available on this website, free of charge, access to our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, Proxy Statements and amendments to those reports, as well as other documents that we file with, or furnish to, the Commission pursuant to Sections 13(a) or 15(d) of the Exchange Act, as soon as reasonably practicable after such documents are filed with, or furnished to, the Commission. We intend to use our website as a means of disclosing material non-public information and for complying with disclosure obligations under Regulation FD. Such disclosures will be included on our website under the heading “Investors—IR Home.” Accordingly, investors should monitor such portion of our website, in addition to following our press releases, Commission filings and public conference calls and webcasts. Periodically, we also update our investor presentations which can be viewed on our website. You may read and copy any materials we file with the Commission at the Commission’s Public Reference Room at 100 F Street, N.E., Washington, DC 20549. You can obtain information on the operation of the Public Reference Room by calling the Commission at 1-800-732-0330. The SEC maintains an Internet site that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the Commission at http://www.sec.gov. Our Corporate Governance Guidelines, Code of Conduct, titled "Navigating with Integrity," (which applies to all employees, including our Chief Executive Officer and certain Financial and Accounting Officers), Code of Business Conduct and Ethics for Members of the Board of Directors, and the charters for our Audit, Nominating/Corporate Governance and Compensation Committees, can all be found on the Investor Relations page of our website under “Corporate Governance”. We intend to disclose any changes to or waivers from the Code of Conduct that would otherwise be required to be disclosed under Item 5.05 of Form 8-K on our website. We will also provide printed copies of these materials to any stockholder upon request to Hornbeck Offshore Services, Inc., Attn: General Counsel, 103 Northpark Boulevard, Suite 300, Covington, Louisiana 70433. The information on our

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website is not, and shall not be deemed to be, a part of this report or incorporated into any other filings we make with the Commission.

ITEM 1A—Risk Factors

Our results of operations and financial condition can be adversely affected by numerous risks. You should carefully consider the risks described below as well as the other information we have provided in this Annual Report on Form 10-K. The risks described below are not the only ones we face. You should also consider the factors contained in our “Forward Looking Statements” disclaimer found on page ii of this Annual Report on Form 10-K. Additional risks not presently known to us or that we currently deem immaterial may also impair our business operations.

We may not have the funds available or be able to obtain the funds necessary to meet the obligations relating to our 2019 convertible senior notes, our 2020 senior notes, or our 2021 senior notes.

Our 2019 convertible senior notes, our 2020 senior notes, and our 2021 senior notes, which collectively have a face value of $1,125 million, mature in September 2019, April 2020, and March 2021, respectively. In addition, upon the occurrence of certain change of control events, as defined in the indentures governing the 2020 senior notes and the 2021 senior notes, holders of such notes would have the right to require us to repurchase such notes at 101% of their principal amount, plus accrued and unpaid interest. Further, upon certain fundamental changes as defined in the indenture governing the 2019 convertible senior notes, holders of such notes would have the right to require us to repurchase such notes at 100% of their principal amount, plus any accrued and unpaid interest. We do not expect to have sufficient cash on hand and cash flow from operations to meet all of these obligations as they come due and will need to access additional sources of capital in order to refinance some or all of this indebtedness prior to maturity. There can be no assurance that we will succeed in accessing new capital or, if successful, that the capital we raise will not be expensive or dilutive to stockholders. Failure to meet our obligations related to any tranche of our senior notes may result in the acceleration of our other indebtedness and result in a material adverse effect on our financial condition and results of operations.

As a result of the ongoing declines in oil prices that began in late 2014, our clients have reduced and may further reduce spending on exploration and production projects, resulting in a decrease in demand for our services.

Oil and natural gas prices, and market expectations of potential changes in these prices, significantly impact the level of worldwide drilling and production services activities. Reduced demand for oil and natural gas or periods of surplus oil and natural gas generally result in lower prices for these commodities and often impact the economics of planned drilling projects and ongoing production projects, resulting in the curtailment, reduction, delay or postponement of such projects for an indeterminate period of time. When drilling and production activity and spending declines, both vessel dayrates and utilization for our vessels historically decline as well. This has been the case, beginning in October 2014 and continuing into 2017.

Oil prices worldwide have dropped significantly since 2014. If the current depressed oil and natural gas prices persist for a prolonged period, or decline further, oil and gas exploration and production companies will likely cancel or curtail additional drilling programs and lower production spending on existing wells even more than they have already, thereby further reducing demand for our services.

Any prolonged reduction in the overall level of exploration and development activities, whether resulting from changes in oil and gas prices or otherwise, could materially and adversely affect us by negatively impacting:

•our revenues, cash flows and profitability;

•the fair market value of our vessels;

•our ability to maintain or increase our borrowing capacity;

• our ability to obtain capital to re-finance our existing debt or expand our business through acquisitions, or otherwise;

•the collectability of our receivables; and

• our ability to retain or rehire skilled personnel whom we would need in the event of an upturn in the demand for our services.

If any of the foregoing were to occur, it could have a material adverse effect on our business and financial results.

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Increases in the supply of vessels could decrease dayrates.

In addition to our fifth OSV newbuild program, which is nearing completion, certain of our competitors previously announced plans to construct new vessels to be deployed in domestic and foreign locations, thus adding to the available vessel capacity. A remobilization to the GoM oilfield of U.S.-flagged vessels currently operating in other regions or in non-oilfield applications would result in an increase in vessel capacity in the GoM, one of our core markets. Similarly, vessel capacity in foreign markets, including our core markets of Mexico and Brazil, may also be impacted by U.S.-flagged or other vessels migrating to such foreign locations. Further, a repeal, suspension or significant modification of the Jones Act, or the administrative erosion of its benefits, permitting vessels that are either foreign-flagged, foreign-built, foreign-owned, foreign-controlled or foreign-operated to engage in the U.S. coastwise trade, would also result in an increase in capacity. Any increase in the supply of OSVs or MPSVs, whether through new construction, refurbishment or conversion of vessels from other uses, remobilization or changes in law or its application, could not only increase competition for charters and lower utilization and dayrates, which would adversely affect our revenues and profitability, but could also worsen the impact of the current or any future downturn in the oil and gas industry on our results of operations and financial condition. Because some services provided by MPSVs are not protected by the Jones Act, foreign competitors may bring additional MPSVs to the GoM or build additional MPSVs that we will compete with domestically or internationally for such services.

The level of offshore oil and gas exploration, development and production activity has historically been volatile and is likely to continue to be so in the future. The level of activity is subject to large fluctuations in response to relatively minor changes in a variety of factors that are beyond our control

Changes in, among others, the following factors can negatively impact our performance:

• worldwide demand for oil and natural gas;

• prevailing oil and natural gas prices and expectations about future prices and price volatility;

• changes in capital spending budgets by our customers;

• the ability of oil and gas companies to generate or otherwise obtain funds for exploration and production;

• local and international political and economic conditions and policies;

• unavailability of drilling rigs in our core markets of the GoM, Mexico and Brazil;

• the cost of offshore exploration for, and production and transportation of, oil and natural gas;

• successful exploration for, and production and transportation of, oil and natural gas from onshore sources;

• consolidation of oil and gas and oil service companies operating offshore;

• availability and rate of discovery of new oil and natural gas reserves in offshore areas;

• technological advances affecting energy production and consumption;

• the ability or willingness of the Organization of Petroleum Exporting Countries, or OPEC, to set and maintain production levels for oil;

• oil and natural gas production levels by non-OPEC countries;

• weather conditions; and

• environmental and other regulations affecting our customers and their other service providers.

Since late 2014, we have observed a significant decline in oil prices, which has caused oil companies to announce and implement significant reductions in their capital spending programs, that is the source of much of our business activity. A prolonged reduction in oil prices is having and could continue to have a significant adverse and long-term impact on the Company’s financial condition and results of operations.

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The early termination of contracts on our vessels could have an adverse effect on our operations.

Some of the long-term contracts for our vessels and all contracts with governmental entities and national oil companies contain early termination options in favor of the customer; however, some have early termination remedies or other provisions designed to discourage the customers from exercising such options. We cannot assure that our customers would not choose to exercise their termination rights in spite of such remedies or the threat of litigation with us. Until replacement of such business with other customers, any termination could temporarily disrupt our business or otherwise adversely affect our financial condition and results of operations. We might not be able to replace such business on economically equivalent terms. In addition, during the current and prior downturns, we have experienced customers requesting contractual concessions even though contrary to existing contractual terms. While not legally required to give concessions, commercial considerations may dictate that we do so, given the relatively few deepwater customers operating in the GoM.

Intense competition in our industry could reduce our profitability and market share.

Contracts for our vessels are generally awarded on an intensely competitive basis. Some of our competitors are willing to accept lower dayrates in order to maintain utilization, which can have a negative impact on our dayrates and utilization. As a result, we could lose customers and market share to these competitors. Similarly, competition in various markets may also be impacted by U.S.-flagged vessels migrating in and out of foreign locations due to the pace of drilling activity in the GoM.

Additional reductions in Petrobras' announced plans for exploration and production activities offshore

Brazil could have a material adverse effect on the market for high-spec OSVs.

Petrobras accounts for a substantial portion of global deepwater drilling activity and has publicly announced plans to reduce its investment in exploration and production activities by roughly $24 billion from 2017 through 2021 compared to the prior four-year 2015-2019 plan. This reduction and any decision by Petrobras to further reduce the scope or pace of its announced exploration and production plans offshore Brazil could negatively impact the worldwide market for high-spec OSVs and limit our ability to effect further expansion into this market.

We may not be able to complete the construction of our remaining newbuild program or may experience delays or cost overruns related to that program.

We are currently constructing the last two MPSVs under our pending newbuild program. These vessels are large and complex. We are required to make remaining milestone payments to the shipyard and other vendors totaling approximately $71 million, the majority of which payments will be due in 2018 upon delivery of each vessel from the shipyard. While we have sufficient cash on hand today to meet these obligations, unforeseen events could result in our inability to fund these obligations when they come due, which could have an adverse impact on our business plans, financial condition and results from operations. Additionally, the shipyard might be delayed or unforeseen events could result in significant cost overruns for which, under certain circumstances, we might be responsible. Such delays or cost overruns could impact our ability to meet our obligations to the shipyard and could otherwise materially and adversely affect our financial condition and results from operations.

The failure to successfully complete repairs, maintenance and routine drydockings on-schedule and on-budget could adversely affect our financial condition and results of operations.

We routinely engage shipyards to drydock our vessels for regulatory compliance and to provide repair and maintenance. These activities are subject to the risks of delay and cost overruns inherent in any large construction project, including shortages of equipment, lack of shipyard availability, unforeseen engineering problems, work stoppages, weather interference, unanticipated cost increases, including costs of steel, inability to obtain necessary certifications and approvals and shortages of materials or skilled labor. Significant delays could result in adverse effects to our anticipated contract commitments or revenues. Significant cost overruns could adversely affect our financial condition and results of operations.

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We have grown, and may continue to grow, through acquisitions that give rise to risks and challenges that could adversely affect our future financial results.

We regularly consider possible acquisitions of single vessels, vessel fleets and businesses that complement our existing operations to enable us to grow our business. Acquisitions can involve a number of special risks and challenges, including:

• diversion of management time and attention from our existing business and other business opportunities;

• delays in closing or the inability to close an acquisition for any reason, including third party consents or approvals;

• any unanticipated negative impact on us of disclosed or undisclosed matters relating to any vessels or operations acquired;

• loss or termination of employees, including costs associated with the termination or replacement of those employees;

• assumption of debt or other liabilities of the acquired business, including litigation related to the acquired business;

• the incurrence of additional acquisition-related debt as well as increased expenses and working capital requirements;

• dilution of stock ownership of existing stockholders;

• increased costs and efforts in connection with compliance with Section 404 of the Sarbanes-Oxley Act; and

• substantial accounting charges for restructuring and related expenses, impairment of goodwill, amortization of intangible assets, and stock-based compensation expense.

Even if we consummate an acquisition, the process of integrating acquired operations into our own may result in unforeseen operating difficulties and costs and may require significant management attention and financial resources. In addition, integrating acquired businesses may impact the effectiveness of our internal controls over financial reporting. In the currently depressed market for OSVs, we might not be able to place vessels we acquire into immediate service, which will result in our paying for the cost to stack these vessels and eventually the cost to bring them out of stack, which could be a significant barrier to their utilization if we do not have sufficient liquidity to justify such expenses. Any of the foregoing, and other factors, could harm our ability to achieve anticipated levels of utilization and profitability from acquired vessels or businesses or to realize other anticipated benefits of acquisitions.

We can give no assurance that we will be able to identify desirable acquisition candidates or that we will be successful in entering into definitive agreements or closing such acquisitions on satisfactory terms. An inability to acquire additional vessels or businesses may limit our growth potential.

Our contracts with the United States Government could be impacted by budget cuts.

Our government contracts depend upon annual funding commitments authorized by Congress. In a period of government budget cuts or other political events, our contracts might not be re-authorized, resulting in a material decline in our anticipated revenues.

We are subject to complex laws and regulations, including environmental regulations that can adversely affect the cost, manner or feasibility of doing business.

Increasingly stringent federal, state, local and foreign laws and regulations governing worker health and safety and the manning, construction and operation of vessels significantly affect our operations. Many aspects of the marine industry are subject to extensive governmental regulation by the USCG, the National Transportation Safety Board, the EPA and the United States Customs Service, and their foreign equivalents, and to regulation by private industry organizations such as the American Bureau of Shipping. The USCG and the National Transportation Safety Board set safety standards and are authorized to investigate vessel accidents and recommend improved safety standards, while the USCG and Customs Service are authorized to inspect vessels at will. Our operations are also subject to international conventions, federal, state, local and international laws and regulations that control the discharge of pollutants into the

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environment or otherwise relate to environmental protection. Compliance with such laws, regulations and standards may require installation of costly equipment, increased manning, specific training, and/or operational changes. While we endeavor to comply with all applicable laws, circumstances might exist where we might not come into complete compliance with applicable laws and regulations which could result in administrative and civil penalties, criminal sanctions, imposition of remedial obligations or the suspension or termination of our operations. Some environmental laws impose strict liability for remediation of spills and releases of oil and hazardous substances, which could subject us to liability without regard to whether we were negligent or at fault. These laws and regulations may expose us to liability for the conduct of, or conditions caused by, others, including charterers. Moreover, these laws and regulations could change in ways that substantially increase costs that we may not be able to pass along to our customers. Any changes in applicable conventions or laws, regulations or standards that would impose additional requirements or restrictions on our or our oil and gas exploration and production customers’ operations could adversely affect our financial condition and results of operations. It is possible that laws and regulations may become even more stringent, which could also adversely affect our financial condition and results of operations.

We are also subject to the Merchant Marine Act of 1936, which provides that, upon proclamation by the President of a national emergency or a threat to the security of the national defense, the Secretary of Transportation may requisition or purchase any vessel or other watercraft owned by United States citizens (which includes United States corporations), including vessels under construction in the United States. If one of our OSVs or MPSVs were purchased or requisitioned by the federal government under this law, we would be entitled to be paid the fair market value of the vessel in the case of a purchase or, in the case of a requisition, the fair market value of charter hire. We would also not be entitled to be compensated for any consequential damages we suffer as a result of the requisition or purchase of any of our OSVs or MPSVs. The purchase or the requisition for an extended period of time of one or more of our vessels could adversely affect our results of operations and financial condition.

Finally, we are subject to the Merchant Marine Act of 1920, commonly referred to as the Jones Act, which requires that vessels engaged in coastwise trade to carry cargo between U.S. ports be documented under the laws of the United States and be controlled by U.S. citizens. A corporation is not considered a U.S. citizen unless, among other things, at least 75% of the ownership of voting interests with respect to its equity securities are held by U.S. citizens. We endeavor to ensure that we would be determined to be a U.S. citizen as defined under these laws by including in our certificate of incorporation certain restrictions on the ownership of our capital stock by non-U.S. citizens and establishing certain mechanisms to maintain compliance with these laws. If we are determined at any time not to be in compliance with these citizenship requirements, our vessels might become ineligible to engage in the coastwise trade in U.S. domestic waters, and our business and operating results would be adversely affected.

The Jones Act’s provisions restricting coastwise trade to vessels controlled by U.S. citizens have been circumvented in recent years by foreign interests that seek to engage in trade reserved for vessels controlled by U.S. citizens and otherwise qualifying for coastwise trade. Legal challenges against such actions are difficult, costly to pursue and are of uncertain outcome. In addition, the Jones Act is often criticized and there are efforts underway by affected interest groups to seek its repeal. To the extent such efforts are successful and foreign competition is permitted, such competition could have a material adverse effect on domestic companies in the offshore service vessel industry and on our financial condition and results of operations. In addition, in the interest of national defense, the Secretary of Homeland Security is authorized to suspend the coastwise trading restrictions imposed by the Jones Act on vessels not controlled by U.S. citizens. Such waivers are granted from time-to-time.

Our business involves many operating risks that may disrupt our business or otherwise result in substantial losses, and insurance may be unavailable or inadequate to protect us against these risks.

Our vessels are subject to operating risks such as:

• catastrophic marine disaster;

• adverse weather and sea conditions;

• mechanical failure;

• collisions or allisions;

• oil and hazardous substance spills;

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• navigation errors;

• acts of God; and

• war and terrorism.

The occurrence of any of these events may result in damage to or loss of our vessels or other property, injury or death of people or contamination of the environment. If any of these events were to occur, we could be exposed to liability for resulting damages and possible penalties that, pursuant to typical marine indemnity policies, we must pay and then seek reimbursement from our insurer. Affected vessels may also be removed from service and thus be unavailable for income-generating activity. While we believe our insurance coverage is adequate and insures us against risks that are customary in the industry, we may be unable to renew such coverage in the future at commercially reasonable rates. Moreover, existing or future coverage may not be sufficient to cover claims that may arise and we do not maintain insurance for loss of income resulting from a marine casualty.

Our operations in international markets and shipyard activities in foreign shipyards subjects us to risks inherent in conducting business internationally.

We derive a portion of our revenues from foreign sources. In addition, certain of our shipyard repair and procurement activities are being conducted with foreign vendors. We therefore face risks inherent in conducting business internationally, such as legal and governmental regulatory requirements, potential vessel seizure or nationalization of assets, import-export quotas or other trade barriers, difficulties in collecting accounts receivable and longer collection periods, political and economic instability, kidnapping of or assault on personnel, piracy, adverse tax consequences, difficulties and costs of staffing international operations and language and cultural differences. We do not hedge against foreign currency risk. While we endeavor to contract in U.S. Dollars when operating internationally, some contracts may be denominated in a foreign currency, which would result in a foreign currency exposure risk. All of these risks are beyond our control and difficult to insure against. We cannot predict the nature and the likelihood of any such events. If such an event should occur, however, it could have a material adverse effect on our financial condition and results of operations.

We may lose the right to operate in some international markets in which we have a presence.

In certain foreign markets in which we operate, most notably Mexico, we sometimes depend upon governmental waivers of cabotage laws. These waivers could be revoked or made more burdensome, which could result in our inability to continue our operations or materially increase the costs of operating in such foreign locations. In addition, our foreign customers are often large state-owned oil companies that have monopolies or near monopolies in their home countries. These companies sometimes impose contractual requirements or restrictions that cannot be negotiated away and that can impose significant operating risks upon us. From time to time, we have challenged these contractual actions in foreign markets, which entails significant risks.

Future results of operations depend on the long-term financial stability of our customers.

Some of the contracts we enter into for our vessels are full utilization contracts with initial terms ranging from one to five years. We enter into these long-term contracts with our customers based on a credit assessment at the time of execution. Our financial condition in any period may therefore depend on the long-term stability and creditworthiness of our customers. We can provide no assurance that our customers will fulfill their obligations under our long-term contracts and the insolvency or other failure of a customer to fulfill its obligations under such contracts could adversely affect our financial condition and results of operations.

We may be unable to attract and retain qualified, skilled employees necessary to operate our business.

Our success depends in large part on our ability to attract and retain highly skilled and qualified personnel. Our inability to hire, train and retain a sufficient number of qualified employees could impair our ability to manage, maintain and grow our business.

In crewing our vessels, we require skilled employees who can perform physically demanding work. As a result of the recent volatility of the oil and gas industry, we have significantly reduced our mariner headcount. Additionally, as a result of such volatility, vessel employees and potential employees may choose to pursue employment in fields that offer a more desirable work environment at wage rates that are competitive with ours. Further, unlike the current weak market

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conditions, during normal market conditions, we face strong competition within the broader oilfield industry for employees and potential employees, including competition from drilling rig operators for our fleet personnel. We may have difficulty hiring employees or finding suitable replacements as needed and, once normal market conditions return, should a reduced pool of workers arise, it is possible that we would have to raise wage rates or increase our benefits offered to attract workers and to retain our current employees. In such circumstances, should we not be able to increase our service rates to our customers to compensate for wage-rate increases or recruit qualified personnel to operate our vessels at full utilization, our financial condition and results of operations may be adversely affected.

Our employees are covered by federal laws that may subject us to job-related claims in addition to those provided by state laws.

Some of our employees are covered by provisions of the Jones Act, the Death on the High Seas Act and general maritime law. These laws preempt state workers’ compensation laws and permit these employees and their representatives to pursue actions against employers for job-related incidents in federal courts based on tort theories. Because we are not generally protected by the damage limits imposed by state workers’ compensation statutes for these types of claims, we may have greater exposure for any claims made by these employees.

Our success depends on key members of our management, the loss of whom could disrupt our business operations.

We depend to a large extent on the efforts and continued employment of our executive officers and key management personnel. We do not maintain key-man insurance. The loss of services of one or more of our executive officers or key management personnel could have a negative impact on our financial condition and results of operations.

Restrictions contained in the indentures governing our 2020 senior notes, our 2021 senior notes, and in the agreement governing our revolving credit facility may limit our ability to obtain additional financing and to pursue other business opportunities.

Covenants contained in the indenture governing our 2020 senior notes, in the indenture governing our 2021 senior notes and in the agreement governing our revolving credit facility require us to meet certain financial tests, which may limit or otherwise restrict:

• our flexibility in operating, planning for, and reacting to changes, in our business;

• our ability to dispose of assets, withstand current or future economic or industry downturns and compete with others in our industry for strategic opportunities; and

• our ability to obtain additional financing for working capital, refinancing of existing debt, capital expenditures, including our newbuild programs, acquisitions, general corporate and other purposes.

We have high levels of fixed costs that will be incurred regardless of our level of business activity.

Our business has high fixed costs. Downtime or low productivity due to reduced demand, as is currently being experienced, from weather interruptions or other causes can have a significant negative effect on our operating results and financial condition. In addition, given our recent vessel stackings, our fixed costs are borne by a substantially smaller active fleet of vessels.

Our revenues and operating results may vary significantly from quarter to quarter due to a number of factors such as volatility in our vessel dayrates, changes in utilization, vessel incidents and other unforeseen matters. Many of these factors that may cause our actual financial results to vary from our publicly disclosed earnings guidance and forecasts are outside of our control.

Our actual financial results might vary from those anticipated by us or by securities analysts and investors, and these variations could be material. From time to time we publicly provide various forms of guidance, which reflect our projections about future market expectations and operating performance. The numerous assumptions underlying such guidance may be impacted by factors that are beyond our control and might not turn out to be accurate. Although we believe that the assumptions underlying our projections are reasonable when such projections are made, actual results could be materially different, particularly with respect to our MPSVs.

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We are susceptible to unexpected increases in operating expenses such as crew wages, materials and supplies, maintenance and repairs, and insurance costs.

Many of our operating costs, such as crew wages, materials and supplies, maintenance and repairs, and insurance costs, are unpredictable and vary based on events beyond our control. Our gross margins will vary based on fluctuations in our operating costs. If our costs increase or we encounter unforeseen costs, we may not be able to recover such costs from our customers, which could adversely affect our financial position, results of operations and cash flows.

Stacked vessels may introduce additional operational issues.

In recognition of weak market conditions, we have elected to stack OSVs and MPSVs on various dates since October 1, 2014. We may choose to stack additional vessels should market conditions warrant. In connection with such stackings, we have reduced our mariner headcount significantly. Operationally, we limit the number of persons available to maintain such stacked vessels. Also, we have fewer revenue-producing units in service that can contribute to our results and contribute cash flows to cover our fixed costs and commitments. When stacked vessels return to service, we will incur previously deferred drydocking costs for regulatory recertifications and may incur costs to hire and train mariners to operate such vessels. Delay in reactivating stacked vessels and the costs and other expenses related to the reactivation of stacked vessels could have a material adverse effect on our cash flows and results of operations.

We may be adversely affected by uncertainty in the global financial markets.

Our future results may be impacted by volatility, weakness or deterioration in the debt and equity capital markets. Inflation, deflation, or other adverse economic conditions may negatively affect us or parties with whom we do business resulting in their non-payment or inability to perform obligations owed to us, such as the failure of customers to honor their commitments, the failure of shipyards and major suppliers to complete orders or the failure by banks to provide expected funding under our revolving credit agreement. Additionally, credit market conditions may slow our collection efforts as customers experience increased difficulty in obtaining requisite financing, potentially leading to lost revenue and higher than normal accounts receivable. This could result in greater expense associated with collection efforts and increased bad debt expense.

Any significant softening in the already limited global economic recovery may adversely impact our ability to issue additional debt and equity in the future on acceptable terms. We cannot be certain that additional funding will be available if needed and to the extent required, on acceptable terms.

We may be unable to collect amounts owed to us by our customers.

We typically grant our customers credit on a short-term basis. Related credit risks are inherent as we do not typically collateralize receivables due from customers. We provide estimates for uncollectible accounts based primarily on our judgment using historical losses, current economic conditions and individual evaluations of each customer as evidence supporting the receivables valuations stated on our financial statements. However, our receivables valuation estimates may not be accurate and receivables due from customers reflected in our financial statements may not be collectible.

Future changes in legislation, policy, restrictions or regulations for drilling in the United States that cause delays or deter new drilling could have a material adverse effect on our financial position, results of operations and cash flows.

In response to the April 20, 2010, Deepwater Horizon incident, the regulatory agencies with jurisdiction over oil and gas exploration, including the DOI, imposed temporary moratoria on drilling operations, by requiring operators to reapply for exploration plans and drilling permits that had previously been approved, and by adopting numerous new regulations and new interpretations of existing regulations regarding offshore operations that are applicable to our customers and with which their new applications for exploration plans and drilling permits must prove compliant. Compliance with these new regulations and new interpretations of existing regulations have materially increased the cost of drilling operations in the GoM. These additional compliance costs could materially adversely impact our business, financial position or results of operations.

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The fundamental change purchase feature of our 2019 convertible senior notes and the change of control purchase features of our 2020 senior notes and our 2021 senior notes and provisions of our certificate of incorporation, bylaws, stockholder rights plan and Delaware law may delay or prevent an otherwise beneficial takeover attempt of the Company.

The terms of our 2019 convertible senior notes require us to purchase the notes for cash in the event of a fundamental change, as defined in the applicable indenture. Upon a change in control, our 2020 senior notes and our 2021 senior notes require us to repurchase such senior notes at 101% of aggregate principal. A takeover of the Company would trigger the requirement that we purchase the 2019 convertible senior notes, the 2020 senior notes and the 2021 senior notes. Furthermore, our certificate of incorporation and bylaws, Delaware corporations law, and our stockholder rights plan contain provisions that could have the effect of making it more difficult for a third party to acquire, or discourage a third party from attempting to acquire, control of us. These provisions could limit the price that investors might be willing to pay in the future for shares of our common stock and may have the effect of delaying or preventing a takeover of the Company that would otherwise be beneficial to investors.

Our stock price has been volatile, declining precipitously from time to time during the period from 2013 through the present, and it could decline again.

The securities markets in general and our common stock in particular have experienced significant price and volume volatility in recent years. The market price and trading volume of our common stock may continue to experience significant fluctuations due not only to general stock market conditions but also to a change in sentiment in the market regarding our operations or business prospects or those of companies in our industry. In addition to the other risk factors discussed above, the price and volume volatility of our common stock may be affected by:

• factors influencing the levels of global oil and natural gas exploration and exploitation activities, such as the current depressed prices for oil or natural gas;

• the ability or willingness of OPEC to set and maintain production levels for oil;

• oil and gas production levels by non-OPEC countries;

• operating results that vary from the expectations of securities analysts and investors;

• disasters such as the Deepwater Horizon incident in the Gulf of Mexico in 2010;

• the operating and securities price performance of companies that investors or analysts consider comparable to us;

• actions by rating agencies related to our 2019 convertible senior notes, our 2020 senior notes, or our 2021 senior notes;

• geopolitical risks;

• announcements of strategic developments, acquisitions and other material events by us or by our competitors; and

• changes in global financial markets and global economies and general market conditions, such as interest rates, commodity and equity prices and the value of financial assets.

ITEM 1B—Unresolved Staff Comments

None.

ITEM 2—Properties

Our principal executive offices are in Covington, Louisiana, where we lease approximately 65,000 square feet of office space under a lease with an initial term expiring in September 2025 and three additional five-year renewal periods. Our primary domestic operating office is located in Port Fourchon, Louisiana. We also maintain four international offices from which we operate our fleet of vessels in Mexico and Brazil, as set forth below. For more information, see "Management’s Discussion and Analysis of Financial Condition and Results of Operations" included within this report. We

23

believe that our facilities, including waterfront locations used for vessel dockage and certain vessel repair work, provide an adequate base of operations for the foreseeable future.

Our principal properties as of December 31, 2016 are as follows:

Location	Description	Area Using Property	Owned/Leased
Covington, Louisiana, USA	Corporate Headquarters	Corporate	Leased
Hammond, Louisiana, USA	Warehouse	GoM	Owned
Port Fourchon, Louisiana, USA	Dock, Office, Warehouse, Yard	GoM	Leased
Paraiso, Tabasco, Mexico	Office	Mexico	Leased
Ciudad Del Carmen, Campeche, Mexico	Office	Mexico	Leased
Barra da Tijuca, Rio de Janeiro, Brazil	Office	Brazil	Leased
Niteroi, Rio de Janeiro, Brazil	Office	Brazil	Leased
Houston, Texas, USA	Office	GoM	Leased

In addition to the foregoing, our revenues are principally derived from our vessels described in "Item 1—Business" of this Annual Report on Form 10-K.

Item 3—Legal Proceedings

In December 2000, LEEVAC Marine Inc. (a predecessor entity to our current subsidiary Hornbeck Offshore Transportation, LLC, or HOT) was one of several companies that formed a limited liability company, SSIC Remediation, LLC, or SSIC, which conducted interim phase environmental remedial activities at the SBA Shipyards site in Jennings, Louisiana pursuant to a December 9, 2002 Order and Agreement with the EPA. In 2015, the EPA notified SSIC’s counsel of its renewed interest in the site and on September 9, 2016 published a final rule (effective October 11, 2016) adding the site to the General Superfund section of the CERCLA National Priorities List. In November 2016, HOT and nine other parties voluntarily entered into an Administrative Settlement Agreement and Order on Consent to conduct a Remedial Investigation/Feasibility Study, or RIFS, in connection with the site. HOT has accrued a liability of $0.1 million to cover expenses anticipated to be incurred with respect to conducting the RIFS. HOT’s anticipated percentage of liability for the RIFS cost and subsequent cleanup efforts with other members of the group is 4%. The Company has not made a judgment concerning the ultimate cost of clean up should it be required.

Item 4—Mine Safety Disclosures

None.

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PART II

Item 5—Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock, $0.01 par value, trades on the New York Stock Exchange, or NYSE, under the trading symbol “HOS”. The following table sets forth, for the quarterly periods indicated, the high and low sale prices for our common stock as reported by the NYSE during 2016 and 2015.

	2016				2015
	High		Low		High		Low
First Quarter	$	12.98	$	5.58	$	25.40	$	17.91
Second Quarter	$	12.57	$	7.67	$	25.22	$	18.64
Third Quarter	$	9.62	$	4.35	$	20.98	$	13.33
Fourth Quarter	$	9.07	$	3.00	$	17.80	$	8.23

On January 31, 2017, we had 23 holders of record of our common stock.

We have not previously declared or paid, and we do not plan to declare or pay in the foreseeable future, any cash dividends on our common stock. Our current intention is to retain all additional cash that our business generates to cover all of our growth capital expenditures, commercial-related capital expenditures, annually recurring cash debt service, maintenance capital expenditures and cash income taxes. Any future payment of cash dividends or stock or debt repurchases will depend upon our financial condition, capital requirements, plans to reduce our long-term debt and our earnings, as well as other factors that our Board of Directors may deem relevant. In addition, the indentures governing our 2020 senior notes, our 2021 senior notes and the agreement governing our revolving credit facility include restrictions on our ability to pay cash dividends on our common stock. See "Item 7-Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 6 to our consolidated financial statements for further discussion.

See "Item 12-Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters” for information regarding shares of common stock authorized for issuance under our equity compensation plans.

Repurchase of Common Stock

On October 28, 2014, our Board of Directors authorized us to repurchase up to $150 million in shares of our common stock using different methods including, but not limited to, open-market purchases, privately negotiated transactions, accelerated share repurchases and Rule 10b5-1 trading plans. The timing and amount of the repurchases depends on several factors, such as market conditions, applicable legal requirements, available liquidity, the discretion of management and other appropriate factors. The repurchase program does not obligate us to acquire any particular amount of common stock and may be modified, suspended or discontinued at any time. As of December 31, 2016, we had repurchased and retired 891,396 shares at an average price of $28.05 per share. The repurchased shares cost a total of $25 million and represented roughly 2.5% of our total shares outstanding prior to the commencement of the program. As of February 24, 2017, no additional shares had been repurchased.

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Item 6—Selected Financial Data

SELECTED HISTORICAL CONSOLIDATED FINANCIAL INFORMATION

(In thousands, except operating and per share data)

Our selected historical consolidated financial information as of and for the years ended December 31, 2016, 2015, 2014, 2013 and 2012, was derived from our audited historical consolidated financial statements prepared in accordance with GAAP. The data should be read in conjunction with and is qualified in its entirety by reference to “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our historical consolidated financial statements and the notes to those statements included elsewhere in this Annual Report on Form 10-K. In 2013, we closed the sale of our Downstream segment to Genesis Marine, LLC. The historical results for the Downstream segment and the gain on the sale of that segment have been presented as discontinued operations for all periods in the Selected Historical Consolidated Financial Information presented herein. See Note 14 of the Consolidated Financial Statements for more information.

	Year Ended December 31,
	2016			2015			2014			2013			2012
Statement of Operations Data:
Revenues	$	224,299		$	476,070		$	634,793		$	548,145		$	463,309
Operating expenses	131,658			219,260			296,500			239,239			226,462
Depreciation and amortization	113,556			109,029			115,450			85,962			73,675
General and administrative expenses	43,358			48,297			54,245			53,428			45,178
Gain (loss) on sale of assets	54			44,060			822			1,587			(350		)
Operating income (loss)	(64,219		)	143,544			169,420			171,103			117,644
Loss on early extinguishment of debt	—			—			—			(25,776		)	(6,048		)
Interest income	1,490			1,525			1,086			2,515			2,167
Interest expense	48,675			39,496			30,733			47,352			57,869
Other income (expenses)(1)	2,052			1,005			501			(92		)	185
Income (loss) before income taxes	(109,352		)	106,578			140,274			100,398			56,079
Income tax expense (benefit)	(45,506		)	39,757			52,367			36,320			21,384
Income (loss) from continuing operations	(63,846		)	66,821			87,907			64,078			34,695
Income from discontinued operations, net of tax	—			—			618			47,315			2,322
Net income (loss)	(63,846		)	66,821			88,525			111,393			37,017
Per Share Data:
Basic earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.87		$	2.43		$	1.79		$	0.98
Basic earnings per common share from discontinued operations	—			—			0.02			1.31			0.07
Basic earnings (loss) per common share	$	(1.76	)	$	1.87		$	2.45		$	3.10		$	1.05
Diluted earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.84		$	2.40		$	1.76		$	0.97
Diluted earnings per common share from discontinued operations	—			—			0.01			1.29			0.06
Diluted earnings (loss) per common share	$	(1.76	)	$	1.84		$	2.41		$	3.05		$	1.03
Weighted average basic shares outstanding	36,248			35,755			36,172			35,895			35,311
Weighted average diluted shares outstanding(2)	36,248			36,302			36,692			36,548			36,080
Balance Sheet Data (at period end):
Cash and cash equivalents	$	217,027		$	259,801		$	185,123		$	439,291		$	576,678
Working capital(3)	225,412			279,522			254,827			447,195			360,754
Property, plant, and equipment from continuing operations, net	2,578,388			2,574,661			2,459,486			2,125,374			1,643,623
Property, plant, and equipment from discontinued operations, net	—			—			—			759			168,487
Total assets(4)	2,878,275			2,984,416			2,860,935			2,743,015			2,584,971
Total short-term debt(5)	—			—			—			—			238,071
Total long-term debt(6) (7)	1,083,710			1,070,281			1,057,487			1,045,297			833,326
Total stockholders’ equity	1,402,996			1,446,163			1,370,765			1,295,428			1,165,845
Statement of Cash Flows Data:
Net cash provided by (used in) continuing operations:
Operating activities	$	53,050		$	215,843		$	163,106		$	207,067		$	128,865
Investing activities	(97,011		)	(141,349		)	(401,515		)	(526,630		)	(255,323		)
Financing activities	198			1,023			(19,664		)	(61,344		)	334,391
Net cash provided by (used in) discontinued operations:
Operating activities	$	—		$	—		$	2,374		$	15,368		$	13,847
Investing activities	—			—			1,638			228,689			(1,772		)
Other Financial Data (unaudited):
EBITDA(8)	$	51,389		$	253,578		$	285,371		$	231,197		$	185,456
Capital expenditures	97,535			293,349			408,693			542,651			258,325
Other Operating Data (unaudited)(9):
Average number of new generation OSVs(10)	61.9			60.0			57.4			50.7			51.0
Average number of active new generation OSVs(11)	20.6			42.0			56.6			50.3			48.3
Average new generation OSV fleet capacity (DWT)	218,854			206,030			177,033			132,564			128,190
Average new generation OSV vessel capacity (DWT)	3,535			3,436			3,076			2,609			2,514
Average new generation OSV utilization rate(12)	25.2		%	54.4		%	79.6		%	83.7		%	83.2		%
Effective new generation OSV utilization rate (13)	75.7		%	77.8		%	80.7		%	84.4		%	87.8		%
Average new generation OSV dayrate(14)	$	25,233		$	26,278		$	27,416		$	26,605		$	23,445
Effective dayrate(15)	$	6,359		$	14,295		$	21,823		$	22,268		$	19,506

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⁽¹⁾  Represents other operating income and expenses, including equity in income from investments and foreign currency transaction gains or losses.

⁽²⁾  For the year ended December 31, 2016, due to a net loss, the Company excluded from the calculation of loss per share the effect of equity awards representing rights to acquire 975 shares of common stock. For the year ended December 31, 2015, the Company had 322 anti-dilutive stock options. For the years ended December 31, 2014, 2013 and 2012, the Company had no anti-dilutive stock options. See Note 3 of our consolidated financial statements for more information about diluted shares outstanding.

⁽³⁾  Includes working capital (deficit) from discontinued operations in the amount of $470, $1,461, and $(1,750) as of December 31, 2014, 2013, and 2012, respectively.

⁽⁴⁾  Includes total assets from discontinued operations in the amount of $470, $2,337, and $176,277 as of December 31, 2014, 2013 and 2012, respectively.

⁽⁵⁾  Excludes imputed original issue discount associated with our 2026 convertible senior notes in the amount of $11,093 as of December 31, 2012. Also excludes deferred financing costs associated with our 2026 convertible senior notes in the amount of $836 as of December 31, 2012. These notes were putable by the holders to the Company on November 15, 2013 and therefore were classified as short-term debt. These notes were converted or redeemed in full by the Company in November 2013.

⁽⁶⁾  Excludes original issue discount associated with our 2017 senior notes in the amount of $4,771 as of December 31, 2012; and imputed original issue discount associated with our 2019 convertible senior notes in the amount of $31,093, $41,600, $51,528, $60,908 and $69,699 as of December 31, 2016, 2015, 2014, 2013 and 2012, respectively.

⁽⁷⁾  Excludes deferred financing costs associated with our 2017 senior notes in the amount of $3,702 as of December 31, 2012; and deferred financing costs associated with our 2019 convertible senior notes in the amount of $3,061, $4,095, $5,073, $5,996 and $6,801 as of December 31, 2016, 2015, 2014, 2013 and 2012, respectively; and deferred financing costs associated with our 2020 senior notes in the amount of $3,025, $3,944, $4,863, $5,782 and $6,701 as of December 31, 2016, 2015, 2014, 2013 and 2012, respectively; and deferred financing costs associated with our 2021 senior notes in the amount of $4,111, $5,080, $6,049, $7,017 as of December 31, 2016, 2015, 2014 and 2013, respectively.

⁽⁸⁾  See our discussion of EBITDA as a non-GAAP financial measure immediately following these footnotes.

⁽⁹⁾  Excluded from the Other Operating Data are the results of operations for our MPSVs, our shore-base facility, and vessel management services. Due to the fact that each of our MPSVs have a workload capacity and significantly higher income generating potential than each of our new generation OSVs, the utilization and dayrate levels of our MPSVs could have a very large impact on our results of operations. For this reason, our consolidated operating results, on a period-to-period basis, are disproportionately impacted by the level of dayrates and utilization achieved by our MPSVs.

⁽¹⁰⁾  We owned 62 new generation OSVs as of December 31, 2016. Our average number of new generation OSVs for the years ended December 31, 2016, 2015, 2014, 2013, and 2012, reflect the deliveries of certain vessels under our fourth and fifth OSV newbuild programs. Please refer to Our Vessels on page 7 of this Form 10-K for more information about vessel names and placed in-service dates. Excluded from this data is one conventional OSV, which was sold during 2016 that was considered a non-core asset.

⁽¹¹⁾  In response to weak market conditions, we elected to stack certain of our new generation OSVs on various dates in 2009 and 2010. Based on improved market conditions, we had re-activated all of our stacked new generation OSVs by June 30, 2013. During 2014, we experienced weak market conditions for which we elected to stack certain of our new generation OSVs on various dates during the fourth quarter of 2014 and throughout 2015 and 2016.

⁽¹²⁾  Utilization rates are average rates based on a 365-day year. Vessels are considered utilized when they are generating revenues.

⁽¹³⁾  Effective utilization rate is based on a denominator comprised only of vessel-days available for service by the active fleet, which excludes the impact of stacked vessel days.

⁽¹⁴⁾  Average dayrates represent average revenue per day, which includes charter hire, crewing services and net brokerage revenues, based on the number of days during the period that the OSVs generated revenue.

⁽¹⁵⁾  Effective dayrate represents the average dayrate multiplied by the average new generation utilization rate.

Non-GAAP Financial Measures

We disclose and discuss EBITDA as a non-GAAP financial measure in our public releases, including quarterly earnings releases, investor conference calls and other filings with the Commission. We define EBITDA as earnings (net income) before interest, income taxes, depreciation and amortization. Our measure of EBITDA may not be comparable to similarly titled measures presented by other companies. Other companies may calculate EBITDA differently than we do, which may limit their usefulness as comparative measures.

We view EBITDA primarily as a liquidity measure and, as such, we believe that the GAAP financial measure most directly comparable to this measure is cash flows provided by operating activities. Because EBITDA is not a measure of financial performance calculated in accordance with GAAP, it should not be considered in isolation or as a substitute for operating income, net income or loss, cash flows provided by operating, investing and financing activities, or other income or cash flow statement data prepared in accordance with GAAP.

EBITDA is widely used by investors and other users of our financial statements as a supplemental financial measure that, when viewed with our GAAP results and the accompanying reconciliation, we believe provides additional information that is useful to gain an understanding of the factors and trends affecting our ability to service debt, pay deferred taxes and fund drydocking charges and other maintenance capital expenditures. We also believe the disclosure of EBITDA helps investors meaningfully evaluate and compare our cash flow generating capacity from quarter to quarter and year to year.

EBITDA is also a financial metric used by management (i) as a supplemental internal measure for planning and forecasting overall expectations and for evaluating actual results against such expectations; (ii) as a significant criteria for annual incentive cash bonuses paid to our executive officers and other shore-based employees; (iii) to compare to the EBITDA of other companies when evaluating potential acquisitions; and (iv) to assess our ability to service existing fixed charges and incur additional indebtedness.

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The following table provides the detailed components of EBITDA from continuing operations as we define that term for the years ended December 31, 2016, 2015, 2014, 2013, and 2012 respectively (in thousands).

	Year Ended December 31,
	2016			2015			2014			2013			2012
Components of EBITDA:
Income (loss) from continuing operations	$	(63,846	)	$	66,821		$	87,907		$	64,078		$	34,695
Interest, net:
Debt obligations	48,675			39,496			30,733			47,352			57,869
Interest income	(1,490		)	(1,525		)	(1,086		)	(2,515		)	(2,167		)
Total interest, net	47,185			37,971			29,647			44,837			55,702
Income tax expense (benefit)	(45,506		)	39,757			52,367			36,320			21,384
Depreciation	93,071			82,566			71,301			55,332			52,005
Amortization	20,485			26,463			44,149			30,630			21,670
EBITDA	$	51,389		$	253,578		$	285,371		$	231,197		$	185,456

The following table reconciles EBITDA from continuing operations to cash flows provided by operating activities for the years ended December 31, 2016, 2015, 2014, 2013, and 2012 respectively (in thousands). 

	Year Ended December 31,
	2016			2015			2014			2013			2012
EBITDA Reconciliation to GAAP:
EBITDA	$	51,389		$	253,578		$	285,371		$	231,197		$	185,456
Cash paid for deferred drydocking charges	(3,978		)	(13,267		)	(43,609		)	(35,875		)	(39,211		)
Cash paid for interest	(50,152		)	(50,492		)	(50,548		)	(53,636		)	(38,597		)
Cash paid for taxes	(3,732		)	(4,808		)	(5,679		)	(4,537		)	(1,332		)
Changes in working capital	50,351			65,415			(32,213		)	33,458			3,571
Stock-based compensation expense	9,983			10,293			10,324			11,888			10,805
(Gain) loss on sale of assets	(54		)	(44,060		)	(822		)	(1,587		)	350
Loss on early extinguishment of debt	—			—			—			25,776			6,048
Changes in other, net	(757		)	(816		)	282			383			1,775
Cash flows provided by continuing operations	$	53,050		$	215,843		$	163,106		$	207,067		$	128,865

In addition, we also make certain adjustments, as applicable, to EBITDA for losses on early extinguishment of debt, stock-based compensation expense and interest income, to internally evaluate our performance based on the computation of ratios historically used in certain financial covenants of our credit agreements with various lenders. We believe that these ratios can be material components of financial covenants and, when applicable, failure to comply with such covenants could result in the acceleration of indebtedness or the imposition of restrictions on our financial flexibility. The recent changes to the applicable covenants contained in our credit facility are described in Note 6 of our consolidated financial statements included herein.

The following table provides certain detailed adjustments to EBITDA, as defined in our revolving credit facility for the years ended December 31, 2016, 2015, 2014, 2013, and 2012, respectively (in thousands).

Adjustments to EBITDA for Computation of Financial Ratios Used in Debt Covenants

	Year Ended December 31,
	2016		2015		2014		2013		2012
Loss on early extinguishment of debt	$	—	$	—	$	—	$	25,776	$	6,048
Stock-based compensation expense	9,983		10,293		10,324		11,914		10,891
Interest income	1,490		1,525		1,086		2,515		2,167

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Set forth below are the material limitations associated with using EBITDA as a non-GAAP financial measure compared to cash flows provided by operating activities.

• EBITDA does not reflect the future capital expenditure requirements that may be necessary to replace our existing vessels as a result of normal wear and tear,

• EBITDA does not reflect the interest, future principal payments and other financing-related charges necessary to service the debt that we have incurred in acquiring and constructing our vessels,

• EBITDA does not reflect the deferred income taxes that we will eventually have to pay once we are no longer in an overall tax net operating loss carryforward position, as applicable, and

• EBITDA does not reflect changes in our net working capital position.

Management compensates for the above-described limitations in using EBITDA as a non-GAAP financial measure by only using EBITDA to supplement our GAAP results.

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Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following management’s discussion and analysis of financial condition and results of operations should be read in conjunction with our historical consolidated financial statements and their notes included elsewhere in this Annual Report on Form 10-K. This discussion contains forward-looking statements that reflect our current views with respect to future events and financial performance. Our actual results may differ materially from those anticipated in these forward-looking statements or as a result of certain factors such as those set forth in our Forward Looking Statements disclaimer on page ii of this Annual Report on Form 10-K.

General

During 2016, oil prices averaged $43 per barrel. The drop in oil price, from $84 in October 2014, is due to surplus oil, driven in part by a significant rise in U.S. shale oil production as well as other previously unavailable sources of supply, coupled with OPEC suppliers in the Middle East and Russia not reducing their output. In addition, economic weakness in many regions of the world, notably Europe and China, has reduced the previously expected oil consumption growth rate. As a result of lower oil prices, major and independent oil companies with deepwater operations have significantly reduced their capital spending budgets, which are the principal demand drivers for our services. Less spending by our customers combined with a global oversupply of OSVs for current market conditions, including high-spec OSVs in our core markets, have resulted in significant reductions in our dayrates and utilization. In November 2016, OPEC announced an agreement for its members to reduce production beginning in 2017 in an effort to reduce the global surplus of oil. Other oil producing nations agreed to voluntary cuts as well. While the announcement has resulted in a recent increase in oil prices above $50 per barrel, it remains to be seen whether OPEC and non-OPEC countries will comply with their announced agreement to lower production. In addition, the recent increase in prices has incentivized some U.S. shale oil producers to increase their production which may offset all or part of the cuts implemented by OPEC members. Consequently, the recent increase in oil prices may not be sustainable during 2017.

The principal issue facing the industry at this time is the ultimate duration of the current downturn. While we have taken extensive measures to reduce costs, these reductions alone will not be sufficient to mitigate the full impact of revenue loss over an extended period of time. Even in light of the currently reduced level of EBITDA generation, our cash on hand provides a healthy liquidity cushion through the end of 2018. However, we do not believe that our current cash on hand, revolving credit availability and cash generated from operations under current market conditions will be sufficient to repay all three tranches of our $1,125.0 million of principal amount in funded debt that begins to mature in September 2019, without refinancing or restructuring some or all of such debt.

In the GoM, nine high-spec OSVs have been delivered into the domestic market during 2016, including one of our own. We expect an additional 13 high-spec OSVs to be delivered into domestic service through 2018. We do not anticipate significant growth in the supply of high-spec OSVs beyond the currently anticipated level of 207 of such vessels by the end of 2018. During the fourth quarter of 2016, there was an average of roughly 36 floating rigs available in the GoM, while an average of 23.2 were working. As of February 15, 2017, there were 37 rigs available and 24 were working. However, 10 floating rigs have contracts that will expire during 2017. We do not know whether the remaining rigs will receive contract renewals for operations in the GoM. We expect four new rigs to arrive in the GoM during 2017. Once a rig arrives in the GoM, it can take several months to commence work and, therefore, we do not know the timing of when operations of newly arrived rigs will begin, if at all. In the market place, we continue to observe operators shortening or canceling rig contracts, which we believe will further reduce demand for vessels. Given these market conditions, we anticipate our average dayrates and utilization levels will continue to be depressed during 2017. However, the GoM is one of the premier deepwater markets in the world and we are committed to supporting our customers in this market. We feel that once the current supply and demand fundamentals return to normal conditions our results from operations will improve.

In recognition of these weak market conditions, we stacked OSVs and MPSVs on various dates commencing on October 1, 2014. As of December 31, 2016, we had 44 OSVs and two MPSVs stacked. We may consider stacking additional vessels or reactivating vessels as market conditions warrant. These 46 stacked vessels represent 66% of our fleetwide vessel headcount, or 52% of our total OSV and MPSV deadweight tonnage. By stacking vessels, we expect to significantly reduce our cash outlays and lower our risk profile; however, we will have fewer revenue-producing units in service that can contribute to our results and contribute cash flows to cover our fixed costs and

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commitments. While we may choose to stack additional vessels should market conditions warrant, our current expectation is to retain our current active fleet of 24 vessels in the market and to accept contracts at the best available terms even if such contracts are below our cash break even cost of operations.

In Mexico, while the energy reform continues to progress, questions remain on the timing of the incremental activity expected in the Mexican deepwater GoM given the current oil price environment. PEMEX budget reductions have resulted in contract cancellations, drastically curtailing the number of our vessels operating in Mexico from 2015 levels. During 2016, six of our Mexican-flagged vessels were stacked. Nevertheless, we consider Mexico to be a long-term market for our services, especially in light of energy reforms being carried out there. Despite current oil prices, 26 companies were pre-approved as bidders for the first-ever Mexican deepwater lease auction, which occurred in December 2016. We continue to explore opportunities to place additional vessels into Mexico to support PEMEX in its ongoing shallow water activity and non-PEMEX customers in support of future shelf and deepwater activity there.

In Brazil, Petrobras has moved towards an "all Brazilian flag" vessel fleet, which has limited opportunities in Brazil for foreign-flagged vessels, except where highly specialized services are required. In January 2016, we placed one of our newbuild HOSMAX 310 class OSVs into Brazilian registry and have imported that vessel into Brazil. In October 2016, Brazil enacted new legislation that will allow international oil companies to participate as operators of pre-salt offshore developments, reversing a policy that reserved these properties to Petrobras, exclusively. By doing so, the Brazilian government has created the possibility that foreign operators might spur additional exploration and development activity that has been dampened by low oil prices and Petrobras' difficulties.

Our Vessels

All of our current vessels are qualified under the Jones Act to engage in U.S. coastwise trade, except for eight foreign-flagged new generation OSVs, one foreign-flagged well-stimulation vessel and two foreign-flagged MPSVs. As of December 31, 2016, our 18 active new generation OSVs, six MPSVs and four managed OSVs were operating in domestic and international areas as noted in the following table: 

Operating Areas
Domestic
GoM	17
Other U.S. coastlines(1)	6
	23
Foreign
Brazil	1
Mexico	1
Middle East	1
Other Latin America	2
	5
Total Active Vessels(2)	28

⁽¹⁾  Comprised of two owned vessels and four managed vessels that are currently supporting the military.

⁽²⁾  Excluded from this table are 44 OSVs and two MPSVs that were stacked as of December 31, 2016.

OSV Newbuild Program #5. In February 2016, we announced the expansion of our fifth OSV newbuild program to enhance the four then-remaining vessels to be delivered as MPSVs. These enhancements include additional accommodations, additional ROV workspaces, additional crane lifting capacities and, for each of the final two MPSVs, the addition of a 60-foot mid-body section. Our fifth OSV newbuild program now consists of four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MPSVs. As of February 15, 2017, we had delivered and placed in service 22 vessels under such newbuild program. Delivery of the two remaining vessels under this 24-vessel domestic newbuild program is expected to occur during the first and third quarters of 2018. We expect to own 62 new generation OSVs and to manage four vessels for the U.S. Navy, as of December 31, 2017. These aggregate OSV vessel additions result in a projected average new generation OSV fleet complement of 62.0 for fiscal year 2017. With the addition of the two MPSVs, we expect to own ten MPSVs as of December 31, 2018. These MPSV additions result in a projected average MPSV fleet complement of 8.0, 9.3 and 10.0 vessels for the fiscal years 2017, 2018 and 2019, respectively. The aggregate cost of our fifth OSV newbuild program, excluding construction period interest, is expected to be approximately $1,335.0 million, approximately 94.7% of which has already been incurred. For further information regarding our fifth OSV newbuild program, please refer to the Capital Expenditures and Related Commitments section.

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Operating Costs

Our operating costs are primarily a function of fleet size, areas of operations and utilization levels. The most significant direct operating costs are wages paid to vessel crews, maintenance and repairs, and marine insurance. Because most of these expenses are incurred regardless of vessel utilization, our direct operating costs as a percentage of revenues may fluctuate considerably with changes in dayrates and utilization. As of December 31, 2016, we had 46 stacked vessels. By removing these vessels from our active operating fleet, we have been able to significantly reduce our operating costs, including crew costs. If market conditions worsen, we may elect to stack additional vessels. Our fixed operating costs are now spread over 24 owned and operated vessels and four vessels managed for the U.S. Navy.

In certain foreign markets in which we operate, we are susceptible to higher operating costs, such as materials and supplies, crew wages, maintenance and repairs, taxes, importation duties, and insurance costs. Difficulties and costs of staffing international operations, including vessel crews, and language and cultural differences generally contribute to a higher cost structure in foreign locations compared to our domestic operations. We may not be able to recover higher international operating costs through higher dayrates charged to our customers. Therefore, when we increase our international complement of vessels, our gross margins may fluctuate depending on the foreign areas of operation and the complement of vessels operating domestically.

In addition to the operating costs described above, we incur fixed charges related to the depreciation of our fleet and amortization of costs for routine drydock inspections and maintenance and repairs necessary to ensure compliance with applicable regulations and to maintain certifications for our vessels with the USCG and various classification societies. The aggregate number of drydockings and other repairs undertaken in a given period determines the level of maintenance and repair expenses and marine inspection amortization charges. We capitalize costs incurred for drydock inspection and regulatory compliance and amortize such costs over the period between such drydockings, typically 30 months. Applicable maritime regulations require us to drydock our vessels twice in a five-year period for inspection and routine maintenance and repair. If we undertake a disproportionately large number of drydockings in a particular fiscal period, comparability of results may be affected. While we can defer required drydockings of stacked vessels, we will be required to conduct such deferred drydockings prior to such vessels returning to service, which could delay their return to active service.

Critical Accounting Estimates

Our consolidated financial statements included in this Annual Report on Form 10-K have been prepared in accordance with accounting principles generally accepted in the United States. In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP. In other circumstances, we are required to make estimates, judgments and assumptions that we believe are reasonable based upon available information. We base our estimates and judgments on historical experience and various other factors that we believe are reasonable based upon the information available. Actual results may differ from these estimates under different assumptions and conditions. We believe that of our significant accounting policies discussed in Note 2 to our consolidated financial statements, the following may involve estimates that are inherently more subjective.

Carrying Value of Vessels. We depreciate our OSVs and MPSVs over estimated useful lives of 25 years each. Salvage value for our new generation marine equipment is typically 25% of the originally recorded cost for these asset types. In assigning depreciable lives to these assets, we have considered the effects of both physical deterioration largely caused by wear and tear due to operating use and other economic and regulatory factors that could impact commercial viability. To date, our experience confirms that these policies are reasonable, although there may be events or changes in circumstances in the future that indicate that recovery of the carrying amount of our vessels might not be possible.

We presently review our vessels for impairment using the following asset groups: New Generation OSVs and MPSVs. Management has concluded that these groupings are appropriate because our vessels are highly relevant and mobile and are consistent based on the operating and marketing characteristics desired by our customers. When analyzing asset groups for impairment, we consider both historical and projected operating cash flows, operating income, and EBITDA based on current operating environment and future conditions that we can reasonably anticipate, such as inflation or prospective wage costs. These projections are based on, but not limited to, job location, current and historical market dayrates included in recent sales proposals, utilization and contract coverage; along with anticipated market drivers, such as drilling rig movements, results of offshore lease sales and discussions with our customers regarding their ongoing drilling plans. We also consider recent vessel sales and recent vessel appraisals.

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If events or changes in circumstances as set forth above indicate that the asset group’s carrying amount may not be recoverable, we would then be required to estimate the undiscounted future cash flows expected to result from the use of the asset group and its eventual disposition. If the sum of the expected future cash flows is less than the carrying amount of the vessel, we would be required to reduce the carrying amount to fair value. Examples of events or changes in circumstances that could indicate that the recoverability of the carrying amount of our asset groups should be assessed might include a significant change in regulations such as OPA 90, a significant decrease in the market value of the asset group and current period operating or cash flow losses combined with a history of operating or cash flow losses or a projection or forecast that demonstrates continuing losses associated with the asset group.

During the second quarter of 2016, we identified indicators of impairment relating to our vessels. As required by current accounting guidance, we calculated the undiscounted cash flows using a probability weighted forecast for each of our asset groups over their respective remaining useful lives. The total of the undiscounted cash flows was greater than the net book values of our asset groups and, therefore, we concluded that we did not have an impairment to our long-lived assets as of June 30, 2016. In the development of the undiscounted cash flows, in addition to the previously discussed considerations above and in light of current market conditions, we estimate the length of time it takes for the market to absorb our stacked vessels and return those vessels to active status. Any significant revisions to this estimate has the greatest impact in the development of the undiscounted cash flows. If the estimate of the return to active status for our stacked vessels were to be two years longer than its current estimate, the undiscounted cash flows would decrease by approximately 10%, but would still be greater than the respective net book values. See Note 5 to our consolidated financial statements included herein for further discussion. We have not observed any additional indicators of impairment related to our vessels subsequent to June 30, 2016 and we believe that the assumptions used in our undiscounted cash flow analysis continue to be reasonable under current market conditions. We will continue to closely monitor market conditions and potential impairment indicators as long as this market downturn persists.

Recertification Costs. Our vessels are required by regulation to be recertified after certain periods of time. These recertification costs are incurred while the vessel is in drydock where other routine repairs and maintenance are performed and, at times, major replacements and improvements are performed. We expense routine repairs and maintenance as they are incurred. Recertification costs can be accounted for in one of two ways: (1) defer and amortize or (2) expense as incurred. We defer and amortize recertification costs over the length of time that the recertification is expected to last, which is generally 30 months. Major replacements and improvements, which extend the vessel’s economic useful life or functional operating capability, are capitalized and depreciated over the vessel’s remaining economic useful life. Inherent in this process are judgments we make regarding whether the specific cost incurred is capitalizable and the period that the incurred cost will benefit.

Mobilization Costs. Vessels will routinely move to and from international and domestic operating areas. Mobilization costs associated with relocating vessels typically include fuel, crew costs, vessel modifications, materials and supplies, importation taxes or other pre-positioning expenses required by the customer. The extent of mobilization costs incurred to relocate a vessel is directly related to the customer contract terms and area of operation. Some of our charter agreements provide for us to recover mobilization costs through billings to our customers. Unless mobilization costs are rebillable to customers, we expense these costs as incurred.

Revenue Recognition. We charter our vessels to customers under time charters based on a daily rate of hire and recognize revenue as earned on a daily basis during the contract period of the specific vessel.

Allowance for Doubtful Accounts. Our customers are primarily national oil companies, major and independent, domestic and international, oil and gas and oil service companies. Our customers are granted credit on a short-term basis and related credit risks are considered minimal. We usually do not require collateral. We provide an estimate for uncollectible accounts based primarily on management’s judgment. Management uses the relative age of receivable balances, historical losses, current economic conditions and individual evaluations of each customer to make adjustments to the allowance for doubtful accounts. Our historical losses have not been significant. However, because amounts due from individual customers can be significant, future adjustments to the allowance can be material if one or more individual customer’s balances are deemed uncollectible.

Income Taxes. We follow accounting standards for income taxes that require the use of the liability method of computing deferred income taxes. Under this method, deferred income taxes are provided for the temporary differences between the financial reporting basis and the tax basis of our assets and liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The assessment of the realization of deferred tax assets, particularly those related to tax net operating loss carryforwards and foreign tax credit (FTC) carryforwards, involves the use of management’s judgment to determine whether it is more likely than not that we will realize such tax

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benefits in the future prior to their expiration. We continue to review our projected operating results related to the realization of these FTC carryforwards and recently concluded that it is more likely than not we may not realize the full benefit of our FTC carryforwards that are scheduled to expire in 2019. Accordingly, during the fourth quarter of 2016, we recorded a valuation allowance of $2.3 million to reflect the potential inability to fully utilize these credits. In addition, each reporting period, we assess and adjust for any significant changes to our liability for unrecognized income tax benefits. We account for any interest and penalties relating to uncertain tax positions in general and administrative expenses.

Stock-Based Compensation Expense. All equity-settled share-based payments to employees and directors, including grants of stock options and restricted stock units, are recognized over the vesting period in the income statement based on their fair values at the date of grant. All cash-settled share-based payments to employees and directors are recognized in the income statement based on their fair values at the end of the reporting period over their vesting period.

Legal Contingencies. We are involved in a variety of claims, lawsuits, investigations and proceedings, as described in Note 10 to our consolidated financial statements. We determine whether an estimated loss from a contingency should be accrued by assessing whether a loss is deemed probable and can be reasonably estimated. We assess our potential liability by analyzing our litigation and regulatory matters using available information. We develop our views on estimated losses in consultation with outside counsel handling our defense in these matters, which involves an analysis of potential results, assuming a combination of litigation and settlement strategies. Should developments in any of these matters cause a change in our determination such that we expect an unfavorable outcome and result in the need to recognize a material accrual, or should any of these matters result in a final adverse judgment or be settled for a significant amount, they could have a material adverse effect on our results of operations in the period or periods in which such change in determination, judgment or settlement occurs.

Results of Operations

The tables below set forth the average dayrates, utilization rates and effective dayrates for our owned new generation OSVs and the average number and size of such vessels owned during the periods indicated. These vessels generate a substantial portion of our revenues and operating profit. Excluded from the OSV information below is the results of operations for our MPSVs, our shore-base facility, and vessel management services, including the four vessels managed for the U.S. Navy. The Company does not provide average or effective dayrates for its MPSVs. MPSV dayrates are impacted by highly variable customer-required cost-of-sales associated with ancillary equipment and services, such as ROVs, accomodation units and cranes, which are typically recovered through higher dayrates charged to the customer. Due to the fact that each of our MPSVs have a workload capacity and significantly higher income generating potential than each of the Company’s new generation OSVs, the utilization and dayrate levels of our MPSVs could have a very large impact on our results of operations. For this reason, our consolidated operating results, on a period-to-period basis, are disproportionately impacted by the level of dayrates and utilization achieved by our eight MPSVs.

	Years Ended December 31,
	2016			2015			2014
Offshore Supply Vessels:
Average number of new generation OSVs(1)	61.9			60.0			57.4
Average number of active new generation OSVs(2)	20.6			42.0			56.6
Average new generation OSV fleet capacity (DWT)	218,854			206,030			177,033
Average new generation OSV capacity (DWT)	3,535			3,436			3,076
Average new generation OSV utilization rate(3)	25.2		%	54.4		%	79.6		%
Effective new generation OSV utilization rate(4)	75.7		%	77.8		%	80.7		%
Average new generation OSV dayrate(5)	$	25,233		$	26,278		$	27,416
Effective dayrate(6)	$	6,359		$	14,295		$	21,823

⁽¹⁾  We owned 62 new generation OSVs as of December 31, 2016. Our average number of new generation OSVs for the year ended December 31, 2016 reflects the deliveries of certain vessels under our fifth OSV newbuild program. Please refer to Our Vessels on page 7 of this Form 10-K for more information about vessel names and placed in-service dates.

⁽²⁾  In response to weak market conditions, we elected to stack certain of our new generation OSVs on various dates since October 2014. Active new generation OSVs represent vessels that are immediately available for service during each respective period.

⁽³⁾  Utilization rates are average rates based on a 365-day year. Vessels are considered utilized when they are generating revenues.

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⁽⁴⁾  Effective utilization rate is based on a denominator comprised only of vessel-days available for service by the active fleet, which excludes the impact of stacked vessel days.

⁽⁵⁾  Average new generation OSV dayrates represent average revenue per day, which includes charter hire, crewing services and net brokerage revenues, based on the number of days during the period that the OSVs generated revenues.

⁽⁶⁾  Effective dayrate represents the average dayrate multiplied by the average new generations utilization rate.

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YEAR ENDED DECEMBER 31, 2016 COMPARED TO YEAR ENDED DECEMBER 31, 2015

Summarized financial information for the fiscal years ended December 31, 2016and 2015, respectively, is shown below in the following table (in thousands, except percentage changes):

	Year Ended December 31,					Increase (Decrease)
	2016			2015		$ Change			% Change
Revenues:
Vessel revenues
Domestic	$	151,612		$	298,574	$	(146,962	)	(49.2	)	%
Foreign	38,824			147,808		(108,984		)	(73.7	)	%
	190,436			446,382		(255,946		)	(57.3	)	%
Non-vessel revenues	33,863			29,688		4,175			14.1		%
	224,299			476,070		(251,771		)	(52.9	)	%
Operating expenses	131,658			219,260		(87,602		)	(40.0	)	%
Depreciation and amortization	113,556			109,029		4,527			4.2		%
General and administrative expenses	43,358			48,297		(4,939		)	(10.2	)	%
	288,572			376,586		(88,014		)	(23.4	)	%
Gain on sale of assets	54			44,060		(44,006		)	(99.9	)	%
Operating income (loss)	(64,219		)	143,544		(207,763		)	>(100.0)		%
Interest expense	48,675			39,496		9,179			23.2		%
Interest income	1,490			1,525		(35		)	(2.3	)	%
Income tax expense (benefit)	(45,506		)	39,757		(85,263		)	>(100.0)		%
Net income (loss)	$	(63,846	)	$	66,821	$	(130,667	)	>(100.0)		%

Revenues. Revenues for 2016decreased by $251.8 million, or 52.9%, to $224.3 million compared to $476.1 million for 2015. Our weighted-average active operating fleet for 2016 was approximately 27 vessels compared to 48 vessels for 2015.

Vessel revenues decreased $255.9 million, or 57.3%, to $190.4 million for 2016 compared to $446.4 million for 2015. The decrease in vessel revenues primarily resulted from weak market conditions in the GoM, which led to our decision to stack new generation OSVs on various dates during fiscal 2016 and fiscal 2015. For 2016, we had an average of 41.3 OSVs stacked compared to an average of 18.0 OSVs stacked in the prior year. This decrease in vessel revenues was partially offset by $12.7 million in revenues earned from the full or partial-period contribution of eight vessels that were placed in service under our fifth OSV newbuild program since December 2014. Revenue from our MPSV fleet decreased $88.2 million, or 65.5%, for 2016 compared to 2015. Average new generation OSV dayrates were $25,233 for 2016 compared to $26,278 for 2015, a decrease of $1,045, or 4.0%. Our new generation OSV utilization was 25.2% for 2016 compared to 54.4% for 2015. This decrease in utilization is primarily due to weak market conditions for high-spec OSVs operating in the GoM and the incremental vessels that were stacked during 2016 compared to 2015. Our new generation fleet of OSVs incurred 169 days of aggregate downtime for regulatory drydockings and certain vessels were stacked for an aggregate of 15,111 days during 2016. Excluding stacked vessel days, our new generation OSV effective utilization was 75.7%and77.8%during the twelve months ended December 31, 2016 and 2015, respectively. Domestic vessel revenues decreased$147.0 million during 2016 compared to 2015 primarily due to lower effective dayrates earned by vessels operating in our fleet during the twelve months ended December 31, 2016 and the stacking of vessels since December 2014. Foreign vessel revenues decreased$109.0 million primarily due to an average of 11 OSVs and one MPSV that relocated to the GoM from foreign regions or have been stacked on various dates since December 2014. Foreign vessel revenues comprised 20.4% of our total vessel revenues for 2016 compared to 33.1% for 2015.

Non-vessel revenues increased $4.2 million, or 14.1%, to $33.9 million for 2016 compared to $29.7 million for 2015. The increase in non-vessel revenues is primarily due to the full period contribution of management services provided to the four vessels sold to the U.S Navy during 2015.

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Operating expenses. Operating expenses were $131.7 million, a decrease of $87.6 million, or 40.0%, for 2016 compared to $219.3 million for 2015. Operating expenses were primarily driven lower by vessels that were removed from our active fleet count since December 2014, which resulted in a substantial reduction in mariner headcount, and multiple reductions to active mariner pay levels since December 2014. This decrease was partially offset by $9.9 million of operating costs related to the full or partial-period contribution from vessels added to our fleet since December 2014.Aggregate cash operating expenses are projected to be in the range of $115.0 million to $130.0 million for 2017. Such cash operating expense estimate is exclusive of any additional repositioning expenses we may incur in connection with the potential relocation of more of our vessels into international markets or back to the GoM, and any customer-required cost-of-sales related to future contract fixtures that are typically recovered through higher dayrates.

Depreciation and Amortization. Depreciation and amortization expense of $113.6 million was $4.5 million, or 4.2%, higher for 2016 compared to 2015. Depreciation increased by $10.5 million primarily due to the contribution of eight vessels that were placed in service on various dates since December 2014.The depreciation increase was partially offset by a decrease in amortization expense of $6.0 million, which was mainly driven by postponed recertifications for certain of our stacked OSVs. Depreciation expense is expected to increase from current levels when the two remaining vessels under our current newbuild program are placed in service. Amortization expense is expected to decrease as the result of the deferral of regulatory recertification activities for vessels that have been stacked.

General and Administrative Expenses. General and administrative expenses of $43.4 million, or 19.3% of revenues, was $4.9 millionlower, during 2016 compared to 2015. The decrease in G&A expense was primarily due to lower shoreside compensation expense. Shoreside compensation expense was lower due to workforce reductions that were implemented in late 2015 and during 2016, as well as lower short-term incentive compensation expense. Our general and administrative expenses are expected to be in the approximate range of $43.0 to $48.0 million for 2017.

Gain on Sale of Assets. During 2015, we completed the sale of four 250EDF class OSVs to the U.S. Navy for cash consideration of $152.0 million. The sale resulted in a pre-tax gain of approximately $44.1 million ($27.6 million after-tax or $0.76 per diluted share).

Operating Income (Loss). Operating income decreased by $207.8 million to an operating loss of $(64.2) million during 2016 compared to 2015 for the reasons discussed above. Operating loss as a percentage of revenues was (28.6)% for 2016 compared to an operating income margin of 30.2% for 2015. Excluding the gain on sale of assets, our operating income for 2015 would have been $99.5 million, or 20.9% of revenues.

Interest Expense. Interest expense of $48.7 million increased$9.2 million during 2016 compared to 2015 primarily due to capitalizing a lower percentage of interest compared to the prior-year period driven by a lower average construction work-in-progress balance under our newbuild program in 2016. During 2016, we recorded $16.7 million of capitalized construction period interest, or roughly 25.5% of our total interest costs, compared to having $24.7 million, or roughly 38.5% of our total interest costs, for 2015.

Interest Income. Interest income was $1.5 million for fiscal 2016 and for fiscal 2015. Our average cash balance decreased to $237.5 million for 2016 compared to $269.9 million for 2015. The average interest rate earned on our invested cash balances was approximately 0.6% and 0.5% during fiscal years 2016 and 2015, respectively. The decrease in average cash balance was primarily due to cash outflows associated with our fifth OSV newbuild program and lower revenues earned by active vessels operating in our fleet during 2016 compared to the prior-year period.

Income Tax Expense (Benefit). Our effective tax (benefit) rate was (41.6)% and 37.3% for 2016 and 2015, respectively. Our income tax expense for each year primarily consisted of deferred taxes. Our income tax rate differs from the federal statutory rate primarily due to expected state tax liabilities and items not deductible for federal income tax purposes. Our benefit rate for fiscal 2016 was higher than the tax rate in the prior year due to a favorable tax election we made in our 2015 federal income tax return filed in the fourth quarter of 2016. We anticipate our tax rate for fiscal 2017 will be approximately 35%.

Net Income (Loss). Operating performance decreased year-over-year by $130.7 million for a reported net loss of $(63.8) million for 2016 compared to net income of $66.8 million for 2015. Excluding the gain on sale of assets, net income would have been $39.2 million for 2015. This decrease in net income for 2016 was primarily driven by lower revenues due to weak market conditions discussed above and the reduction of active vessels in our operating fleet.

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YEAR ENDED DECEMBER 31, 2015 COMPARED TO YEAR ENDED DECEMBER 31, 2014

Summarized financial information for the fiscal years ended December 31, 2015 and 2014, respectively, is shown below in the following table (in thousands, except percentage changes):

	Year Ended December 31,				Increase (Decrease)
	2015		2014		$ Change			% Change
Revenues:
Vessel revenues
Domestic	$	298,574	$	477,498	$	(178,924	)	(37.5	)	%
Foreign	147,808		144,479		3,329			2.3		%
	446,382		621,977		(175,595		)	(28.2	)	%
Non-vessel revenues	29,688		12,816		16,872			>100.0		%
	476,070		634,793		(158,723		)	(25.0	)	%
Operating expenses	219,260		296,500		(77,240		)	(26.1	)	%
Depreciation and amortization	109,029		115,450		(6,421		)	(5.6	)	%
General and administrative expenses	48,297		54,245		(5,948		)	(11.0	)	%
	376,586		466,195		(89,609		)	(19.2	)	%
Gain on sale of assets	44,060		822		43,238			>100.0		%
Operating income	143,544		169,420		(25,876		)	(15.3	)	%
Interest expense	39,496		30,733		8,763			28.5		%
Interest income	1,525		1,086		439			40.4		%
Income tax expense	39,757		52,367		(12,610		)	(24.1	)	%
Income from continuing operations	66,821		87,907		(21,086		)	(24.0	)	%
Income from discontinued operations, net of tax	—		618		(618		)	(100.0	)	%
Net income	$	66,821	$	88,525	$	(21,704	)	(24.5	)	%

Revenues. Revenues for 2015decreased by $158.7 million, or 25.0%, to $476.1 million compared to $634.8 million for 2014. Our weighted-average active operating fleet for 2015 was approximately 48 vessels compared to 61 vessels for 2014.

Vessel revenues decreased $175.6 million, or 28.2%, to $446.4 million for 2015 compared to $622.0 million for 2014. The decrease in vessel revenues primarily resulted from weak market conditions in the GoM, which led to our decision to stack 28 new generation OSVs on various dates between October 1, 2014 and December 31, 2015. For 2015, we had an average of 18.0 vessels stacked compared to 0.8 vessels stacked in the prior year. This decrease in vessel revenues was partially offset by $54.0 million in revenues from the full or partial-period contribution of 14 vessels that were placed in service under our fifth OSV newbuild program since December 2013. Revenue from our MPSV fleet decreased $40.7 million, or 23.2%, for 2015 compared to 2014. Average new generation OSV dayrates were $26,278 for 2015 compared to $27,416 for 2014, a decrease of $1,138, or 4.2%. Our new generation OSV utilization was 54.4% for 2015 compared to 79.6% for 2014. This decrease in utilization is primarily due to weak spot market conditions for our high-spec OSVs operating in the GoM and the incremental vessels that were stacked during 2015 compared to 2014. Our new generation OSVs incurred 238 days of aggregate downtime for regulatory drydockings and were stacked for an aggregate of 6,587 days during 2015. Excluding stacked vessel days, our new generation OSV effective utilization was 77.8% and 80.7% during 2015 and 2014, respectively. Domestic vessel revenues decreased$178.9 million during 2015 compared to 2014 due to lower dayrates earned by vessels operating in our fleet during 2015 and the stacking of vessels in late 2014 through 2015. Foreign vessel revenues increased by $3.3 million primarily due to the full or partial-period contribution of 11 OSVs and two MPSVs that relocated to foreign regions on various dates since 2013. Foreign vessel revenues comprised 33.1% of our total vessel revenues for 2015 compared to 23.2% for 2014.

Non-vessel revenues increased $16.9 million, or 131.6%, to $29.7 million for 2015 compared to $12.8 million for 2014. The increase in non-vessel revenues is primarily due to incremental revenues associated with management services provided to the four vessels sold to the U.S Navy during 2015 compared to 2014.

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Operating expenses. Operating expenses were $219.3 million, a decrease of $77.2 million, or 26.1%, for 2015 compared to $296.5 million for 2014. Operating expenses were driven lower by vessels that were removed from our active fleet count since late 2014, which resulted in a substantial reduction in mariner headcount. This decrease was partially offset by $25.7 million of operating costs related to the full or partial-period contribution from vessels added to our fleet since December 2013.

Depreciation and Amortization. Depreciation and amortization expense was $6.4 million, or 5.6%, lower for 2015 compared to 2014. Depreciation increased by $11.3 million primarily due to the contribution of 14 vessels that were placed in service on various dates since December 2013. The depreciation increase was more than offset by a decrease in amortization expense of $17.7 million, primarily due to $6.8 million of incremental amortization recorded for the accelerated regulatory drydocking of vessels during 2014 along with lower amortization from the sale of four vessels to the U.S. Navy in 2015 and the deferral of planned drydockings for stacked vessels.

General and Administrative Expenses. General and administrative expenses of $48.3 milliondecreased by $5.9 million, or 11.0%, during 2015 compared to 2014. This decrease in G&A expenses was primarily due to lower shoreside compensation and short-term incentive compensation expense and a reduction in bad debt reserves. General and administrative expenses as a percentage of revenues were 10.1% for 2015 compared to 8.5% for 2014.

Gain on Sale of Assets. During 2015, we completed the sale of four 250EDF class OSVs, the HOS Arrowhead, the HOS Black Powder, the HOS Eagleview and the HOS Westwind, to the U.S. Navy for cash consideration of $152.0 million. The sale resulted in a pre-tax gain of approximately $44.1 million ($27.6 million after-tax or $0.76 per diluted share). During 2014, we sold a non-core 220 class OSV that resulted in an aggregate gain of approximately $0.8 million ($0.5 million after-tax or $0.01 per diluted share).

Operating Income. Operating income decreased by $25.9 million to $143.5 million during 2015 compared to 2014 for the reasons discussed above. Operating income as a percentage of revenues was 30.2% for 2015 compared to 26.7% for 2014. Excluding gain on sales of assets, our operating income for 2015 would have been $99.5 million, or 20.9% of revenues and for 2014 would have been $168.6 million, or 26.6% of revenues.

Interest Expense. Interest expense increased$8.8 million during 2015 compared to 2014 primarily due to capitalizing a lower percentage of interest compared to the prior year. During 2015, we capitalized interest of $24.7 million, or roughly 38% of our total interest costs, compared to capitalized interest of $33.2 million, or roughly 52% of our total interest costs, for 2014.

Interest Income. Interest income increased by $0.4 million to $1.5 million for 2015 compared to $1.1 million for 2014. Our average cash balance decreased to $269.9 million for 2015 compared to $307.9 million for 2014. The average interest rate earned on our invested cash balances was approximately 0.5% and 0.4% during 2015 and 2014, respectively. The decrease in average cash balance was primarily due to cash outflows associated with our fifth OSV newbuild program in 2014 and 2015 and lower revenue earned by active vessels operating in our fleet. These decreases were partially offset by cash inflows from the sale of four vessels to the U.S. Navy in 2015.

Income Tax Expense. Our effective tax rate was 37.3% for 2015 and 2014. During 2015 and 2014, our income tax expense primarily consisted of deferred taxes. Our income tax rate is different from the federal statutory rate primarily due to expected state tax liabilities and items not deductible for federal income tax purposes.

Income from Continuing Operations. Operating performance decreased year-over-year by $21.1 million for reported income from continuing operations of $66.8 million for 2015 compared to $87.9 million for 2014. Excluding gains on sale of assets from both periods presented, income from continuing operations would have been $39.2 million for 2015 compared to $87.4 million for 2014. This decrease in income from continuing operations for 2015 was primarily driven by lower revenues due to weak market conditions discussed above that were partially offset by the gain on sale of four vessels to the U.S. Navy in 2015.

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Liquidity and Capital Resources

Our capital requirements have historically been financed with cash flows from operations, proceeds from issuances of our debt and common equity securities, borrowings under our credit facilities and cash received from the sale of assets. We require capital to fund on-going operations, remaining obligations under our expanded fifth OSV newbuild program, vessel recertifications, discretionary capital expenditures and debt service and may require capital to fund potential future vessel construction, retrofit or conversion projects, acquisitions, stock repurchases or the retirement of debt. The nature of our capital requirements and the types of our financing sources are not expected to change significantly for 2017.

We have reviewed all of our debt agreements, including our revolving credit facility as amended in July 2016, as well as our liquidity position and projected future cash needs. Despite volatility in commodity markets, we remain confident in the short- and long-term viability of our business model. To date, our liquidity has been impacted by such volatility through lower than normal cash flow from operations. However, we project that, even with the current depressed operating levels, cash generated from operations together with cash on-hand should be sufficient to fund our operations and commitments at least through the end of 2018, which is the end of our current guidance period, without drawing on our revolving credit facility. We also believe that we will be able to fund all of the deferred maintenance capital expenditures that will be required upon reactivation of our stacked vessels when market conditions improve with existing sources of liquidity. We have three tranches of funded unsecured debt outstanding that mature in fiscal years 2019, 2020 and 2021, respectively. However, under existing market conditions, we do not currently expect to have sufficient liquidity to repay the principal of these three tranches of funded unsecured debt outstanding when they mature, without refinancing or restructuring some or all of such debt. While we anticipate addressing these balances in advance of their respective maturities, refinancing in the current climate is not likely to be achievable on terms that are in-line with our historic cost of debt capital. We remain fully cognizant of the challenges currently facing the offshore oil and gas industry and are proactively taking steps to protect the business enterprise.

As of December 31, 2016, we had total cash and cash equivalents of $217.0 million. On July 29, 2016, we amended our existing revolving credit facility and as of February 24, 2017, we remain in compliance with all covenants under such facility. The amended facility provides continued access to a reduced level of standby liquidity for working capital and general corporate purposes, including acquisitions, newbuild and conversion programs and other capital expenditures. The borrowing base of the amended credit facility was reduced from $300.0 million to $200.0 million. Among other things, the amended revolving credit facility limits our cash balance to $50 million at any time the facility is drawn, increases the minimum liquidity (cash and revolver availability) level required for prepayment of our 2019 convertible senior notes, 2020 senior notes, and 2021 senior notes from $100 million to $150 million, and increases the minimum liquidity level required to permit a merger, formation or acquisition of a subsidiary or an investment (other than certain permitted investments) from $20 million to $100 million. The amended facility also increased the unused commitment fee to 50 basis points for all pricing levels and the London Interbank Offered Rate, or LIBOR, spreads for funded borrowings to a new range of 225 basis points to 325 basis points. The minimum collateral-to-loan value ratio under the amended facility was restored to its prior level of 200% of the borrowing base, which had been reduced to 150% of the borrowing base when the facility was amended and extended in February 2015. Accordingly, the number of vessels pledged as collateral was increased from 10 OSVs valued in excess of $450 million to 12 OSVs valued in excess of $400 million. None of our remaining assets have been granted as security. The amended credit facility reduced the minimum interest coverage ratio from 3.00x to 1.00x with step-ups to 1.25x in the third quarter of 2018 and 1.50x in the first quarter of 2019 and delayed the step-down in the total debt-to-capitalization ratio from 55% to 50% by six quarters to the third quarter of 2018. We have the option of making a one-time election to suspend the interest coverage ratio for a holiday period of no more than four quarters, ending no later than the fourth quarter of 2017, with a single permitted rescission. We project that we will elect to utilize this interest coverage holiday during fiscal 2017. If we elect to exercise the interest coverage holiday, then the borrowing base will be capped at $75 million during the period of the holiday and the LIBOR spreads for funded borrowings will be increased by an additional 50 basis points during and after the holiday. For additional information with respect to other changes to our revolving credit facility, please refer to Note 6 of our consolidated financial statements included herein and the First Amendment to Second Amended and Restated Credit Agreement referenced as an exhibit to this Form 10-K. The full undrawn amount of such facility is available for all uses of proceeds, including working capital, if necessary, except during an interest coverage ratio holiday, when the borrowing base will be capped at $75 million, and subject to the anti-cash hoarding provision discussed above. If we were not able to maintain compliance with certain covenants of our currently undrawn revolving credit facility, the proceeds of such facility would not be available to us.

On October 28, 2014, our Board of Directors authorized us to repurchase up to $150 million in shares of our common stock from time to time, $25 million of which was used to buy-back 891,396 shares during the fourth quarter

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of 2014. There were no such repurchases during 2016 or 2015. In addition to the foregoing, we may, subject to market conditions and our other strategic options, from time to time amend, extinguish or repurchase our outstanding debt securities or exchange them for other debt or equity securities or loans. While we have an authorized share repurchase program, we currently intend, subject to market conditions, to prioritize our cash usage appropriate to the current market cycle, our longer term commitments and our strategic objectives.

Although in current market conditions, we were still able to generate positive cash flows from operating activities in 2016, events beyond our control, such as sustained low prices for oil and natural gas, a further significant decline in such commodity prices, renewed regulatory-driven delays in the issuance of drilling plans and permits in the GoM, declines in expenditures for exploration, development and production activity, any extended reduction in domestic consumption of refined petroleum products and other reasons discussed under the "Forward Looking Statements" on page ii and "Item 1A—Risk Factors" of this Annual Report on Form 10-K, may affect our financial condition, results of operations or cash flows in the future. Should the need for additional financing arise, we may not be able to access the capital markets on attractive terms at that time or otherwise obtain sufficient capital to meet our maturing debt obligations or finance growth opportunities that may arise. We will continue to closely monitor our liquidity position, as well as the state of the global capital and credit markets. See further discussion in the Contractual Obligations section below.

Cash Flows

Operating Activities. We rely primarily on cash flows from operations to provide working capital for current and future operations. Cash flows from operating activities were $53.1 million in 2016, $215.8 million in 2015, and $163.1 million in 2014. Operating cash flows in 2016 were unfavorably affected by weak market conditions for our vessels operating worldwide, which led to a decline in our weighted-average active operating fleet from 48 to 27 vessels. Operating cash flows in 2015 were favorably impacted by a reduction in outstanding accounts receivable balances combined with lower cash outflows for regulatory drydocking expenses compared to the prior year, partially offset by lower cash inflows from weak market conditions. Cash flows from operations for 2015 reflect full or partial-period contributions from 14 vessels that were placed in service under our fifth OSV newbuild program on various dates during 2014 and 2015. Operating cash flows in 2014 included the impact of $43.6 million of costs related to regulatory recertifications for our vessels. Operating cash flows in 2014 were unfavorably affected by the weak market conditions for our OSVs operating in the GoM, partially offset by the full or partial-period contributions from 14 vessels that were placed in service under our fifth OSV newbuild program on various dates during 2014.

Investing Activities. Net cash used in investing activities was $97.0 million in 2016, $141.3 million in 2015, and $401.5 million in 2014. Cash used in 2016 consisted mainly of construction costs incurred for our fifth OSV newbuild program. Cash used in 2015 consisted of construction costs incurred for our fifth OSV newbuild program partially offset by $152.0 million in aggregate proceeds from the sale of four 250EDF class OSVs to the U.S. Navy. The proceeds from the asset sale have been reinvested in the construction of vessels under our fifth OSV newbuild program. Cash used during 2014 primarily consisted of construction costs incurred for our fifth OSV newbuild program and capital improvements made to our existing operating fleet, partially offset by $7.2 million in aggregate net cash proceeds from the sale of non-core assets.

Financing Activities. Net cash provided by (used in) financing activities was $0.2 million in 2016, $1.0 million in 2015, and $(19.7) million in 2014. Net cash provided by financing activities in 2016 resulted from net proceeds from common shares issued pursuant to our employee stock-based incentive plans, partially offset by deferred financing costs related to the amendments of our existing revolving credit facility. Net cash provided by financing activities in 2015 resulted from net proceeds from common shares issued pursuant to our employee stock-based incentive plans, partially offset by deferred financing costs related to the amendment and extension of our existing $300 million revolving credit facility. Net cash used in financing activities for 2014 primarily resulted from the repurchase of our common stock. See Note 7 to our consolidated financial statements for further information regarding the common stock repurchase.

Discontinued Operations. Net cash provided by discontinued operations related to our former Downstream segment's tug and tank barge business was $4.0 million in 2014. Net cash provided by discontinued operations in 2014 primarily resulted from the sale of our final three older, lower-horsepower tugs. See Note 14 for further discussion regarding Discontinued Operations. The proceeds from the asset sale have been reinvested in the construction of vessels under our fifth OSV newbuild program.

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Commitments and Contractual Obligations

The following table sets forth our aggregate contractual obligations as of December 31, 2016 (in thousands).

Contractual Obligations	Total		Less than 1 Year		1-3 Years		3-5 Years		Thereafter
Vessel construction commitments(1)	$	70,849	$	25,878	$	44,971	$	—	$	—
5.000% senior notes due 2021(2)	450,000		—		—		450,000		—
5.875% senior notes due 2020(3)	375,000		—		—		375,000		—
1.500% convertible senior notes due 2019(4)	300,000		—		300,000		—		—
Interest payments(5)	191,860		49,031		98,063		44,766		—
Operating leases(6)	37,254		2,826		4,786		4,980		24,662
Total	$	1,424,963	$	77,735	$	447,820	$	874,746	$	24,662

⁽¹⁾  Vessel construction commitments reflect contractual milestone payments for our fifth OSV newbuild program. The total project costs for the currently contracted 24-vessel program are expected to be $1,335.0 million, excluding capitalized construction period interest. From the inception of this program through December 31, 2016, we have incurred $1,264.0 million, or 94.7%, of total expected project costs.

⁽²⁾  Our 2021 senior notes, with a fixed interest rate of 5.000% per year, mature on March 1, 2021 and currently include $4,111 of deferred financing costs.

⁽³⁾  Our 2020 senior notes, with a fixed interest rate of 5.875% per year, mature on April 1, 2020 and currently include $3,025 of deferred financing costs.

⁽⁴⁾  Our 2019 convertible senior notes, with a fixed interest rate of 1.500% per year, mature on September 1, 2019 and currently include $31,093 of non-cash original issue discount and $3,061 of deferred financing costs. Holders of the convertible senior notes may require that such notes be repurchased at their option pursuant to certain types of corporate transactions described in Note 6 of our consolidated financial statements included herein. The debt maturities reflected in the table above assume that the holders of our convertible senior notes do not require that such notes be repurchased prior to their maturity in September 2019.

⁽⁵⁾  Interest payments relate to our 2021 senior notes due March 1, 2021, our 2020 senior notes due April 1, 2020 and our 2019 convertible senior notes due September 1, 2019 with semi-annual interest payments of $11.3 million payable March 1 and September 1, $11.0 million payable April 1 and October 1, and $2.3 million payable March 1 and September 1, respectively. Non-cash interest expense has been excluded from the table above.

⁽⁶⁾  Included in operating leases are commitments for a shore-base port facility, office space, and office equipment. See “Item 2—Properties” for additional information regarding our leased office space and other facilities.

Debt

As of December 31, 2016, the Company had the following outstanding long-term debt (in thousands, except effective interest rate):

	Total Debt		Effective Interest Rate		Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020, net of deferred financing costs of $3,025 (1)	$	371,975	6.08	%	$	11,000	April 1 and October 1
5.000% senior notes due 2021, net of deferred financing costs of $4,111 (1)	445,889		5.21	%	11,300		March 1 and September 1
1.500% convertible senior notes due 2019, net of original issue discount of $31,093 and deferred financing costs of $3,061	265,846		6.23	%	2,300		March 1 and September 1
	$	1,083,710

(1) The senior notes do not require any payments of principal prior to their stated maturity dates, but pursuant to the indentures under which the 2020 and 2021 senior notes were issued, we would be required to make offers to purchase such senior notes upon the occurrence of specified events, such as certain asset sales or a change in control.

On July 29, 2016, we amended our existing revolving credit facility. The amended revolving credit facility remains undrawn as of February 24, 2017. With the revolving credit facility, we have the option of borrowing at a variable rate of interest equal to (i) LIBOR plus a margin of 2.25% to 3.25% or (ii) the greatest of the Prime Rate, the Federal Funds Effective Rate plus 1/2 of 1% or LIBOR, plus 1.0%; plus in each case an applicable margin. The applicable margin for each base rate is determined by a pricing grid, which is based on a total debt-to-capitalization ratio, as defined in the credit agreement governing the revolving credit facility, as amended. Unused commitment fees are payable quarterly at the annual rate of 50.0 basis points of the unused portion of the borrowing base of the new revolving credit facility, based on the defined total debt-to-capitalization ratio. For additional information with respect to our amended revolving credit facility, our 2020 senior notes, our 2021 senior notes and our 2019 convertible senior notes, please refer to Note 6 of our consolidated financial statements included herein.

The credit agreement governing the revolving credit facility and the indentures governing our 2020 and 2021 senior notes impose certain operating and financial restrictions on us. Such restrictions affect, and in many cases limit

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or prohibit, among other things, our ability to incur additional indebtedness, make capital expenditures, redeem equity, create liens, sell assets and pay dividends or make other restricted payments. Based on our financial ratios for the year ended December 31, 2016, the full amount of the undrawn borrowing base under our revolving credit facility is available to us for all uses of proceeds, including working capital, if necessary. For the year ended December 31, 2016, we were in compliance with all of our debt covenants. If we do not maintain compliance with certain covenants of our currently undrawn revolving credit facility, the proceeds of such facility will not be available to us. However, the recent amendment added greater flexibility under applicable covenants, subject to the anti-cash hoarding provision that limits our cash balance to no more than $50.0 million at any time the facility is drawn and has a balance outstanding, and to the reduced borrowing base applicable during the period of any interest coverage holiday, should we elect to utilize such a holiday. We continuously review our debt covenants and report to our lenders our compliance with financial ratios on a quarterly basis. We also consider such covenants in evaluating transactions that will have an effect on our financial ratios.

Capital Expenditures and Related Commitments

The following table sets forth the amounts incurred for our fifth OSV newbuild program, before construction period interest, during the year ended December 31, 2016 and since such program’s inception, as well as the estimated total project costs for such program (in millions):

	Year Ended December 31, 2016		Incurred Since Inception		Estimated    Program Totals(1)		Actual/Projected     Delivery Dates(1)
Growth Capital Expenditures:
OSV Newbuild Program #5(2)	$	62.4	$	1,264.0	$	1,335.0	2Q2013-3Q2018

⁽¹⁾  Estimated Program Totals and Projected Delivery Dates are based on internal estimates and are subject to change due to delays and possible cost overruns inherent in any large construction project, including, without limitations, shortages of equipment, lack of shipyard availability, unforeseen engineering problems, work stoppages, weather interference, unanticipated cost increases, the inability to obtain necessary certifications and approvals and shortages of materials, component equipment or skilled labor. All of the above historical and budgeted capital expenditure project amounts for our newbuild program represent estimated cash outlays and do not include any allocation of capitalized construction period interest. Actual and projected delivery dates correspond to the first and last vessels that were contracted with shipyards for construction and delivery under our currently active program, respectively.

⁽²⁾  Our fifth OSV newbuild program consists of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MPSVs. As of February 15, 2017, we had placed 22 vessels in service under such program. The remaining two vessels under this 24-vessel domestic newbuild program are currently expected to be placed in service in the first and third quarters of 2018. Please refer to Our Vessels on page 7 of this Form 10-K for more information about vessel names and placed-in-service dates.

The following table summarizes the costs incurred, prior to the allocation of construction period interest, for the purposes set forth below for the years ended December 31, 2016, 2015, and 2014, and a forecast for the fiscal year ending December 31, 2017 (in millions):

	Year Ended December 31,
	2017		2016		2015		2014
	Forecast		Actual		Actual		Actual
Maintenance and Other Capital Expenditures:
Maintenance Capital Expenditures
Deferred drydocking charges(1)	$	7.5	$	4.0	$	13.3	$	43.6
Other vessel capital improvements(2)	0.9		5.3		14.7		23.7
	8.4		9.3		28.0		67.3
Other Capital Expenditures
200 class OSV retrofit program(3)	—		—		—		0.1
Commercial-related vessel improvements(4)	0.2		15.4		72.1		31.3
Miscellaneous non-vessel additions(5)	0.9		0.6		16.5		9.6
	1.1		16.0		88.6		41.0
Total:	$	9.5	$	25.3	$	116.6	$	108.3

⁽¹⁾  Deferred drydocking charges for 2017 include the projected recertification costs for nine OSVs and three MPSVs.

⁽²⁾  Other vessel capital improvements include costs for discretionary vessel enhancements, which are typically incurred during a planned drydocking event to meet customer specifications.

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⁽³⁾  Our 200 class OSV retrofit program consisted of a vessel construction contract with a domestic shipyard to upgrade and stretch six of our Super 200 class DP-1 OSVs converting them into Stretch 240 class DP-2 OSVs. The total project costs for such program, which commenced in December 2012 and was completed in November 2013, was $50.4 million. These vessel improvement costs have typically resulted in higher dayrates charged to customers.

⁽⁴⁾  Commercial-related vessel improvements include items, such as cranes, ROVs, helidecks, living quarters, and other specialized vessel equipment, which costs are typically included in and offset, in whole or in part, by higher dayrates charged to customers.

⁽⁵⁾  Non-vessel capital expenditures are primarily related to information technology and shore-side support initiatives.

Inflation

To date, general inflationary trends have not had a material effect on our operating revenues or expenses.

Item 7A—Quantitative and Qualitative Disclosures About Market Risk

We have not entered into any derivative financial instrument transactions to manage or reduce market risk or for speculative purposes, other than the convertible note hedge and warrant transactions entered into concurrently with our convertible note offerings in August 2012. Such transactions were entered into to mitigate the potential dilutive effect of the conversion feature of the convertible notes on our common stock. A hypothetical 25% change from our closing share price of $7.22 to $9.03 as of December 31, 2016 would not have had an impact on such warrant transactions because the strike price of the warrants associated with the convertible notes is $68.53.

Changes in interest rates may result in changes in the fair market value of our financial instruments, interest income and interest expense. Our financial instruments that are exposed to interest rate risk are cash equivalents and long-term borrowings. Due to the short duration and conservative nature of our cash equivalent investment portfolio, we do not expect any material loss with respect to our investments. The book value for cash equivalents is considered to be representative of its fair value. A hypothetical 10% change in interest rates as of December 31, 2016 would have had no material impact on such investments, interest income or interest expense.

Changes in market interest rates would not impact the interest expense for our long-term fixed interest rate 2020 senior notes, 2021 senior notes, and 2019 convertible senior notes. However, changes in market interest rates would impact the fair market value of such notes. In general, the fair value of debt with a fixed interest rate will increase as interest rates fall. Conversely, the fair value of debt will decrease as interest rates rise. The currently outstanding 2020 senior notes accrue interest at a rate of 5.875% per annum and mature on April 1, 2020 and the effective interest rate on such notes is 6.08%. The currently outstanding 2021 senior notes accrue interest at the rate of 5.000% per annum and mature on March 1, 2021 and the effective interest rate on such notes is 5.21%. Our outstanding 2019 convertible senior notes accrue interest at the rate of 1.500% and mature on September 1, 2019. The effective interest rate on such notes, after taking into account the accretion of imputed original issue discount, is 6.23%.

In connection with our 2019 convertible senior notes, we are a party to outstanding convertible note hedge transactions with respect to our common stock. The counterparties to such transactions are Barclays Bank PLC; JP Morgan Chase Bank, National Association, London Branch; and Wells Fargo Bank, National Association. We are not currently aware of any collection issues with regard to any of these counterparties.

We estimate the fair value of our 2020 senior notes, 2021 senior notes and 2019 convertible senior notes, all of which are publicly traded, by using quoted market prices. The fair value of our undrawn revolving credit facility, when there are outstanding balances, approximates its carrying value. The face value, carrying value and fair value of our total debt was $1,125.0 million, $1,083.7 million and $788.5 million, respectively, as of December 31, 2016.

As of December 31, 2016, we had no amounts outstanding under our variable interest rate revolving credit facility. Therefore it is not currently subject to interest rate risk.

We have operations in international markets, which include two of our primary geographic regions of Brazil and Mexico. As of December 31, 2016, we had time charters for five of our vessels working in foreign markets. Although most of our time charter contracts are denominated U.S. Dollars, we do collect time charter payments and value added tax, or VAT, payments in local currencies for one vessel, which creates an exchange risk related to currency fluctuations. We also frequently acquire other vessel equipment for our active vessels that are denominated in foreign currencies, which creates an exchange risk to foreign currency fluctuations related to the payment terms of such commitments or purchases. To date, we have not hedged against any foreign currency rate fluctuations associated with foreign currency VAT payments or other foreign currency denominated transactions arising in the normal course of business. We continually monitor the currency exchange risks associated with conducting international operations. To date, gains or losses associated with such fluctuations have not been material. However, should we further expand our operations in international markets, we may become exposed to certain risks typically associated with foreign currency fluctuation.

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Item 8—Financial Statements and Supplementary Data

The financial statements and supplementary information required by this Item appear on pages F-1 through F-37 of this Annual Report on Form 10-K.

Item 9—Changes in and Disagreements with Accountants on Accounting and Financial Disclosures

None.

Item 9A—Controls and Procedures

Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of such period, our disclosure controls and procedures were effective to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures.

Management’s Report on Internal Control Over Financial Reporting

Management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13(a)-15(f) or Rule15d-15(f) under the Exchange Act. Internal control over financial reporting is a process to provide reasonable assurance regarding the reliability of our financial reporting for external purposes in accordance with U.S. generally accepted accounting principles. Internal control over financial reporting includes maintaining records that, in reasonable detail, accurately and fairly reflect our transactions; providing reasonable assurance that transactions are recorded as necessary for preparation of our financial statements in accordance with U.S. generally accepted accounting principles; providing reasonable assurance that receipts and expenditures of Company assets are made in accordance with authorizations of the Company’s management and board of directors; and providing reasonable assurance that unauthorized acquisition, use or disposition of Company assets that could have a material effect on our financial statements would be prevented or detected on a timely basis. Because of its inherent limitations, internal control over financial reporting is not intended to provide absolute assurance that a misstatement of our financial statements would be prevented or detected. In addition, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies of procedures may deteriorate.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2016, utilizing the criteria set forth in the report entitled Internal Control—Integrated Framework issued in 2013 by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based upon such assessment, our management concluded that our internal control over financial reporting was effective as of December 31, 2016.

Ernst & Young LLP, an independent registered public accounting firm, who audited our consolidated financial statements included in this Form 10-K, has issued an attestation report on our internal control over financial reporting which is included herein.

There were no changes in our internal controls over financial reporting that occurred during the year ended December 31, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of

Hornbeck Offshore Services, Inc.

We have audited Hornbeck Offshore Services, Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). Hornbeck Offshore Services, Inc.’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Hornbeck Offshore Services, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Hornbeck Offshore Services, Inc. and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of operations, comprehensive income, changes in stockholders' equity and cash flows for each of the three years in the period ended December 31, 2016 of Hornbeck Offshore Services, Inc. and our report dated February 24, 2017 expressed an unqualified opinion thereon.

	/s/ Ernst & Young LLP
New Orleans, Louisiana
February 24, 2017

46

Item 9B—Other Information

Glossary of Terms

"2014 senior notes" or "2014 notes" means 6.125% senior notes due 2014;

"2017 senior notes" or "2017 notes" means 8.000% senior notes due 2017;

"2019 convertible senior notes" or "2019 notes" means 1.500% convertible senior notes due 2019;

"2020 senior notes" or "2020 notes" means 5.875% senior notes due 2020;

"2021 senior notes" or "2021 notes" means 5.000% senior notes due 2021;

"2026 convertible senior notes" or "2026 notes" means 1.625% convertible senior notes due 2026;

“AHTS” means anchor-handling towing supply;

“ASC” means Financial Accounting Standards Board Accounting Standards Codification;

“average dayrate” means, when referring to OSVs or MPSVs, average revenue per day, which includes charter hire, crewing services and net brokerage revenues, based on the number of days during the period that the OSVs or MPSVs, as applicable, generated revenue. For purposes of vessel brokerage arrangements, this calculation excludes that portion of revenue that is equal to the cost of in-chartering third-party equipment paid by customers;

"BOEM" means the Bureau of Ocean Energy Management;

"BSEE" means the Bureau of Safety and Environmental Enforcement;

"cabotage laws" means laws pertaining to the privilege of operating vessels in the navigable waters of a nation;

“coastwise trade” means the transportation of merchandise or passengers by water, or by land and water, between points in the United States, either directly or via a foreign port;

“conventional” means, when referring to OSVs, vessels that are at least 30 years old, are generally less than 200’ in length or carry less than 1,500 deadweight tons of cargo when originally built and primarily operate, when active, on the continental shelf;

“deepwater” means offshore areas, generally 1,000’ to 5,000’ in depth;

“Deepwater Horizon incident” means the subsea blowout and resulting oil spill at the Macondo well site in the GoM in April 2010 and subsequent sinking of the Deepwater Horizon drilling rig;

“deep-well” means a well drilled to a true vertical depth of 15,000’ or greater, regardless of whether the well was drilled in the shallow water of the Outer Continental Shelf or in the deepwater or ultra-deepwater;

“DOI” means U.S. Department of the Interior and all its various sub-agencies, including effective October 1, 2011 the Bureau of Ocean Energy Management (“BOEM”), which handles offshore leasing, resource evaluation, review and administration of oil and gas exploration and development plans, renewable energy development, National Environmental Policy Act analysis and environmental studies, and the Bureau of Safety and Environmental Enforcement (“BSEE”) which is responsible for the safety and enforcement functions of offshore oil and gas operations, including the development and enforcement of safety and environmental regulations, permitting of offshore exploration, development and production activities, inspections, offshore regulatory programs, oil spill response and newly formed training and environmental compliance programs; BOEM and BSEE being successor entities to the Bureau of Ocean Energy Management, Regulation and Enforcement (“BOEMRE”), which effective June 2010 was the successor entity to the Minerals Management Service;

“domestic public company OSV peer group” includes Gulfmark Offshore, Inc. (NYSE:GLF), SEACOR Holdings Inc. (NYSE:CKH) and Tidewater Inc. (NYSE:TDW);

47

“DP-1”, “DP-2” and “DP-3” mean various classifications of dynamic positioning systems on new generation vessels to automatically maintain a vessel’s position and heading through anchor-less station-keeping;

“DWT” means deadweight tons;

“effective dayrate” means the average dayrate multiplied by the average utilization rate;

“EIA” means the U.S. Energy Information Administration;

"EPA" means United States Environmental Protection Agency;

“flotel” means on-vessel accommodations services, such as lodging, meals and office space;

"GAAP" means United States generally accepted accounting principles;

“GoM” means the U.S. Gulf of Mexico;

“high-specification” or “high-spec” means, when referring to new generation OSVs, vessels with cargo-carrying capacity of greater than 2,500 DWT (i.e., 240 class OSV notations or higher), and dynamic-positioning systems with a DP-2 classification or higher; and, when referring to jack-up drilling rigs, rigs capable of working in 400-ft. of water depth or greater, with hook-load capacity of 2,000,000 lbs. or greater, with cantilever reach of 70-ft. or greater; and minimum quarters capacity of 150 berths or more and dynamic-positioning systems with a DP-2 classification or higher;

"IHS-CERA" means the division of IHS Inc. focused on providing knowledge and independent analysis on energy markets, geopolitics, industry trends and strategy;

"IHS-Petrodata" means the division of IHS Inc. focused on providing data, information, and market intelligence to the offshore energy industry;

“IRM” means inspection, repair and maintenance, also known as “IMR,” or inspection, maintenance and repair, depending on regional preference;

“Jones Act” means the U.S. cabotage law known as the Merchant Marine Act of 1920, as amended;

“Jones Act-qualified” means, when referring to a vessel, a U.S.-flagged vessel qualified to engage in domestic coastwise trade under the Jones Act;

“long-term contract” means a time charter of one year or longer in duration;

“Macondo” means the well site location in the deepwater GoM where the Deepwater Horizon incident occurred as well as such incident itself;

“MPSV” means a multi-purpose support vessel;

“MSRC” means the Marine Spill Response Corporation;

“new generation” means, when referring to OSVs, modern, deepwater-capable vessels subject to the regulations promulgated under the International Convention on Tonnage Measurement of Ships, 1969, which was adopted by the United States and made effective for all U.S.-flagged vessels in 1992 and foreign-flagged equivalent vessels;

“OPA 90” means the Oil Pollution Act of 1990;

“OSV” means an offshore supply vessel, also known as a “PSV,” or platform supply vessel, depending on regional preference;

“PEMEX” means Petroleos Mexicanos;

“Petrobras” means Petroleo Brasileiro S.A.;

“public company OSV peer group” means SEACOR Holdings Inc. (NYSE:CKH), GulfMark Offshore, Inc. (NYSE:GLF), Tidewater Inc. (NYSE:TDW), Farstad Shipping (NO:FAR), Solstad Offshore (NO:SOFF), Deep Sea Supply

48

(NO:DESSC), DOF ASA (NO:DOF), Siem Offshore (NO:SIOFF), Groupe Bourbon SA (GBB:FP), Havila Shipping ASA (NO:HAVI), Eidesvik Offshore (NO:EIOF) and/or Ezra Holdings Ltd (SI:EZRA);

“ROV” means a remotely operated vehicle;

"USCG" means United States Coast Guard;

“ultra-deepwater” means offshore areas, generally more than 5,000’ in depth; and

“ultra high-specification” or “ultra high-spec” means, when referring to new generation OSVs, vessels with cargo-carrying capacity of greater than 5,000 DWT (i.e., 300 class OSV notations or higher), and dynamic-positioning systems with a DP-2 classification or higher.

PART III

Item 10—Directors, Executive Officers and Corporate Governance

The information required under this item is incorporated by reference herein from the Company’s definitive 2017 proxy statement anticipated to be filed with the Securities and Exchange Commission within 120 days after December 31, 2016.

Item 11—Executive Compensation

The information required under this item is incorporated by reference herein from the Company’s definitive 2017 proxy statement anticipated to be filed with the Securities and Exchange Commission within 120 days after December 31, 2016.

Item 12—Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required under this item is incorporated by reference herein from the Company’s definitive 2017 proxy statement anticipated to be filed with the Securities and Exchange Commission within 120 days after December 31, 2016.

Item 13—Certain Relationships and Related Transactions, and Director Independence

The information required under this item is incorporated by reference herein from the Company’s definitive 2017 proxy statement anticipated to be filed with the Securities and Exchange Commission within 120 days after December 31, 2016.

Item 14—Principal Accounting Fees and Services

The information required under this item is incorporated by reference herein from the Company’s definitive 2017 proxy statement anticipated to be filed with the Securities and Exchange Commission within 120 days after December 31, 2016.

49

PART IV

Item 15—Exhibits and Financial Statement Schedules

(a) The following items are filed as part of this report:

1. Financial Statements. The financial statements and information required by Item 8 appear on pages F-1 through F-37 of this report. The Index to Consolidated Financial Statements appears on page F-1.

2. Financial Statement Schedules. All schedules are omitted because they are not applicable or the required information is shown in the financial statements or the notes thereto.

3. Exhibits. The Exhibit Index is shown on page E-1 of this report.

50

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page
CONSOLIDATED FINANCIAL STATEMENTS OF HORNBECK OFFSHORE SERVICES, INC.:
Report of Independent Registered Public Accounting Firm	F - 2
Consolidated Balance Sheets as of December 31, 2016 and 2015	F - 3
Consolidated Statements of Operations for Each of the Three Years in the Period Ended December 31, 2016	F - 4
Consolidated Statements of Comprehensive Income for Each of the Three Years in the Period Ended December  31, 2016	F - 5
Consolidated Statements of Changes in Stockholders’ Equity for Each of the Three Years in the Period Ended December 31, 2016	F - 6
Consolidated Statements of Cash Flows for Each of the Three Years in the Period Ended December 31, 2016	F - 7
Notes to Consolidated Financial Statements	F - 8

F - 1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders

Hornbeck Offshore Services, Inc.

We have audited the accompanying consolidated balance sheets of Hornbeck Offshore Services, Inc. and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of operations, comprehensive income, changes in stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2016. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Hornbeck Offshore Services, Inc. and subsidiaries at December 31, 2016 and 2015, and the consolidated results of their operations and their cash flows for each of the three years in the period ended December 31, 2016, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Hornbeck Offshore Services, Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 24, 2017 expressed an unqualified opinion thereon.

	/s/ Ernst & Young LLP
New Orleans, Louisiana
February 24, 2017

F - 2

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share data)

	Year Ended December 31,
	2016		2015
ASSETS
Current assets:
Cash and cash equivalents	$	217,027	$	259,801
Accounts receivable, net of allowance for doubtful accounts of $2,120 and $2,877, respectively	36,550		91,202
Other current assets	16,978		13,033
Total current assets	270,555		364,036
Property, plant and equipment, net	2,578,388		2,574,661
Deferred charges, net	19,077		35,273
Other assets	10,255		10,446
Total assets	$	2,878,275	$	2,984,416
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	11,774	$	35,742
Accrued interest	14,763		14,795
Accrued payroll and benefits	8,596		10,365
Other accrued liabilities	10,010		23,612
Total current liabilities	45,143		84,514
Long-term debt, net of original issue discount of $31,093 and $41,600 and deferred financing costs of $10,197 and $13,119, respectively	1,083,710		1,070,281
Deferred tax liabilities, net	343,020		381,619
Other liabilities	3,406		1,839
Total liabilities	1,475,279		1,538,253
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—
Common stock: $0.01 par value; 100,000 shares authorized; 36,467 and 35,985 shares issued and outstanding, respectively	365		360
Additional paid-in capital	754,394		748,041
Retained earnings	637,992		701,838
Accumulated other comprehensive income (loss)	10,245		(4,076		)
Total stockholders’ equity	1,402,996		1,446,163
Total liabilities and stockholders’ equity	$	2,878,275	$	2,984,416

The accompanying notes are an integral part of these consolidated statements

F - 3

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

	Year Ended December 31,
	2016			2015			2014
Revenues:
Vessel revenues	$	190,436		$	446,382		$	621,977
Non-vessel revenues	33,863			29,688			12,816
	224,299			476,070			634,793
Costs and expenses:
Operating expenses	131,658			219,260			296,500
Depreciation	93,071			82,566			71,301
Amortization	20,485			26,463			44,149
General and administrative expenses	43,358			48,297			54,245
	288,572			376,586			466,195
Gain on sale of assets	54			44,060			822
Operating income (loss)	(64,219		)	143,544			169,420
Other income (expense):
Interest income	1,490			1,525			1,086
Interest expense	(48,675		)	(39,496		)	(30,733		)
Other income	2,052			1,005			501
	(45,133		)	(36,966		)	(29,146		)
Income (loss) before income taxes	(109,352		)	106,578			140,274
Income tax expense (benefit)	(45,506		)	39,757			52,367
Income (loss) from continuing operations	(63,846		)	66,821			87,907
Income from discontinued operations, net of tax	—			—			618
Net income (loss)	$	(63,846	)	$	66,821		$	88,525
Earnings per share:
Basic earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.87		$	2.43
Basic earnings per common share from discontinued operations	—			—			0.02
Basic earnings (loss) per common share	$	(1.76	)	$	1.87		$	2.45
Diluted earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.84		$	2.40
Diluted earnings per common share from discontinued operations	—			—			0.01
Diluted earnings (loss) per common share	$	(1.76	)	$	1.84		$	2.41
Weighted average basic shares outstanding	36,248			35,755			36,172
Weighted average diluted shares outstanding	36,248			36,302			36,692

The accompanying notes are an integral part of these consolidated statements

F - 4

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands)

	Year Ended December 31,
	2016			2015			2014
Net income (loss)	$	(63,846	)	$	66,821		$	88,525
Other comprehensive income:
Foreign currency translation income (loss), net	14,321			(3,174		)	(107		)
Total comprehensive income (loss)	$	(49,525	)	$	63,647		$	88,418

The accompanying notes are an integral part of these consolidated statements

F - 5

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(In thousands)

	Common Stock					Additional Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Income			Total Stockholders Equity
	Shares		Amount
Balance at January 1, 2014	36,095		$	361		$	724,379		$	571,483		$	(795	)	$	1,295,428
Excess tax benefit from sharebased payments	—		—			292			—			—			292
Shares issued under employee benefit programs	353		4			2,182			—			—			2,186
Stock repurchased and retired	(891	)	(9		)	—			(24,991		)	—			(25,000		)
Stock-based compensation expense	—		—			9,441			—			—			9,441
Net income	—		—			—			88,525			—			88,525
Foreign currency translation loss	—		—			—			—			(107		)	(107		)
Balance at December 31, 2014	35,557		$	356		$	736,294		$	635,017		$	(902	)	$	1,370,765
Tax shortfall from sharebased payments	—		—			(572		)	—			—			(572		)
Shares issued under employee benefit programs	428		4			1,855			—			—			1,859
Stock-based compensation expense	—		—			10,464			—			—			10,464
Net income	—		—			—			66,821			—			66,821
Foreign currency translation loss	—		—			—			—			(3,174		)	(3,174		)
Balance at December 31, 2015	35,985		$	360		$	748,041		$	701,838		$	(4,076	)	$	1,446,163
Tax shortfall from sharebased payments	—		—			(1,863		)	—			—			(1,863		)
Shares issued under employee benefit programs	482		5			844			—			—			849
Stock-based compensation expense	—		—			7,372			—			—			7,372
Net loss	—		—			—			(63,846		)	—			(63,846		)
Foreign currency translation income	—		—			—			—			14,321			14,321
Balance at December 31, 2016	36,467		$	365		$	754,394		$	637,992		$	10,245		$	1,402,996

The accompanying notes are an integral part of these consolidated statements

F - 6

HORNBECK OFFSHORE SERVICES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Year Ended December 31,
	2016			2015			2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from continuing operations	$	(63,846	)	$	66,821		$	87,907
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities:
Depreciation	93,071			82,566			71,301
Amortization	20,485			26,463			44,149
Stock-based compensation expense	9,983			10,293			10,324
Addition to (reduction of) provision for bad debts	(757		)	(816		)	282
Deferred tax expense (benefit)	(43,051		)	34,086			50,440
Amortization of deferred financing costs	11,371			9,675			8,154
Gain on sale of assets	(54		)	(44,060		)	(822		)
Changes in operating assets and liabilities:
Accounts receivable	58,322			39,743			(38,500		)
Other current and long-term assets	(2,272		)	8,472			(8,393		)
Deferred drydocking charges	(3,978		)	(13,267		)	(43,609		)
Accounts payable	(10,901		)	(10,486		)	(4,146		)
Accrued liabilities and other liabilities	(15,292		)	6,448			(13,981		)
Accrued interest	(31		)	(95		)	—
Net cash provided by operating activities	53,050			215,843			163,106
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	(76,277		)	(190,070		)	(343,989		)
Net proceeds from sale of assets	524			152,000			7,178
Vessel capital expenditures	(20,689		)	(86,792		)	(55,089		)
Non-vessel capital expenditures	(569		)	(16,487		)	(9,615		)
Net cash used in investing activities	(97,011		)	(141,349		)	(401,515		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based payments	—			—			292
Repurchase of common stock	—			—			(25,000		)
Deferred financing costs	(1,102		)	(2,089		)	—
Net cash proceeds from other shares issued	1,300			3,112			5,044
Net cash provided by (used in) financing activities	198			1,023			(19,664		)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by operating activities	—			—			2,374
Net cash provided by investing activities	—			—			1,638
Net cash provided by discontinued operations	—			—			4,012
Effects of exchange rate changes on cash	989			(839		)	(107		)
Net increase (decrease) in cash and cash equivalents	(42,774		)	74,678			(254,168		)
Cash and cash equivalents at beginning of period	259,801			185,123			439,291
Cash and cash equivalents at end of period	$	217,027		$	259,801		$	185,123
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,152		$	50,492		$	50,548
Cash paid for income taxes	$	3,732		$	4,808		$	5,679

The accompanying notes are an integral part of these consolidated statements

F - 7

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Organization

Nature of Operations

Hornbeck Offshore Services, Inc., or the Company, was incorporated in the state of Delaware in 1997. The Company, through its subsidiaries, operates offshore supply vessels, or OSVs, multi-purpose support vessels, or MPSVs, and a shore-base facility to provide logistics support and specialty services to the offshore oil and gas exploration and production industry, primarily in the U.S. Gulf of Mexico, or GoM, Latin America and select international markets, as well as specialty services for the U.S. military. All significant intercompany accounts and transactions have been eliminated.

2. Summary of Significant Accounting Policies

Revenue Recognition

The Company charters its OSVs and MPSVs to clients under time charters based on a daily rate of hire and recognizes revenue as earned on a daily basis during the contract period of the specific vessel.

Deferred revenue represents payments received from customers or billings submitted to customers in advance of providing vessel access through time charters or other contracted arrangements.

Cash and Cash Equivalents

Cash and cash equivalents consist of all highly liquid investments in money market funds, deposits and investments available for current use with an initial maturity of three months or less.

Accounts Receivable

Accounts receivable consists of trade receivables, net of reserves and amounts to be rebilled to customers.

Property, Plant and Equipment

Property, plant and equipment is recorded at cost. Depreciation and amortization of equipment and leasehold improvements are computed using the straight-line method based on the estimated useful lives of the related assets. Major modifications and improvements, which extend the useful life of the vessel, are capitalized and amortized over the remaining useful life of the vessel. Gains and losses from retirements or other dispositions are recognized as incurred. Salvage values for new generation marine equipment are estimated to be 25% of the originally recorded cost.

The estimated useful lives by classification are as follows:

Offshore supply vessels	25 years
Multi-purpose support vessels	25 years
Non-vessel related property, plant and equipment	3-28 years

See “Considerations Regarding Impairment of Long-Lived Assets” below for more information.

Deferred Charges

The Company’s vessels are required by regulation to be recertified after certain periods of time. The Company defers the drydocking expenditures incurred due to regulatory marine inspections and amortizes the costs on a straight-line basis over the period to be benefited from such expenditures (generally 30 months). Financing charges are amortized over the term of the related debt.

Deferred charges also include prepaid lease expenses related to the Company’s shore-base port facility. Such prepaid lease expenses are being amortized on a straight-line basis over the effective remaining term of the lease.

F - 8

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Mobilization Costs

The Company incurs mobilization costs to transit its vessels to and from certain regions and/or for long-term contracts. These costs, which are typically expensed as incurred, include, but are not limited to, fuel, crew wages, vessel modification and pre-positioning expenses, materials and supplies and importation taxes.

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using currently enacted tax rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The provision for income taxes includes provisions for federal, state and foreign income taxes. Interest and penalties relating to uncertain tax positions are recorded as general and administrative expenses. In addition, the Company provides a valuation allowance for deferred tax assets if it is more likely than not that such items will either expire before the Company is able to realize the benefit or the future deductibility is uncertain. As a result of the sale of the Downstream segment during 2013, the Company believed that certain state operating loss carryforwards would not be realizable and thus recorded a valuation allowance of $0.9 million for the year ended December 31, 2013. During 2014, the Company recorded an additional $0.1 million related to these state operating losses. During 2015, the total valuation allowance of $1.0 million on these state operating losses was reversed since the losses were written off upon ceasing to do business in those particular jurisdictions. As of December 31, 2016, the Company believed that it is more likely than not that foreign tax credits expiring in 2019 will not be fully utilized. In the fourth quarter of 2016, the Company elected to establish a valuation allowance of $2.3 million for the portion of such credits that it has concluded may not be utilized by December 31, 2019.

Use of Estimates

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Legal Liabilities

In the ordinary course of business, the Company may become party to lawsuits, administrative proceedings, or governmental investigations. These matters may involve large or unspecified damages or penalties that may be sought from the Company and may require years to resolve. The Company records a liability related to a loss contingency to such legal matters in accrued liabilities if the Company determines the loss to be both probable and estimable. The liability is recorded for an amount that is management’s best estimate of the loss, or when a best estimate cannot be made, the minimum loss amount of a range of possible outcomes. Significant judgment is required in estimating such liabilities, the results of which can vary significantly from the actual outcomes of lawsuits, administrative proceedings or governmental investigations.

Concentration of Credit Risk

Customers are primarily major and independent, domestic and international, oil and oil service companies, as well as national oil companies and the U.S. military. The Company’s customers are granted credit on a short-term basis and related credit risks are considered minimal. The Company usually does not require collateral. The Company provides an estimate for uncollectible accounts based primarily on management’s judgment using the relative age of customer balances, historical losses, current economic conditions and individual evaluations of each customer to make adjustments to the allowance for doubtful accounts. As of December 31, 2016, one customer represented 14% of the Company's net

accounts receivable balance.

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HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table represents the allowance for doubtful accounts (in thousands):

	December 31,
	2016			2015			2014
Balance, beginning of year	$	2,877		$	3,693		$	3,411
Changes to provision	(757		)	(816		)	282
Balance, end of year	$	2,120		$	2,877		$	3,693

Foreign Currency Transaction Gains and Losses

Foreign currency transaction gains and losses are recorded in the period incurred except for advances to and investments in foreign subsidiaries.  Foreign currency gains and losses related to advances to or investments in foreign operations are accounted for as a foreign currency translation adjustment and recorded as other comprehensive income. Foreign currency transaction adjustments for fiscal years 2016, 2015 and 2014 were not material to the financial statements.  The balance in accumulated other comprehensive income as of December 31, 2016 relates primarily to the Company’s long term investments in its foreign subsidiaries.

Considerations Regarding Impairment of Long-Lived Assets

In accordance with ASC360, the Company periodically reviews long-lived asset valuations when events or changes in circumstances indicate that an asset's carrying value might not be recoverable. If indicators of impairment exist, the Company assesses the recoverability of its long-lived assets by comparing the projected future undiscounted cash flows associated with the related long-lived asset group over their remaining estimated useful lives. If the sum of the estimated undiscounted cash flows is less than the carrying amounts of the asset group, the assets would be written down to their estimated fair values based on the expected discounted future cash flows or appraised values attributable to the assets. The future cash flows are subjective and are based on the Company's current assumptions regarding future dayrates, utilization, operating expense, G&A expense and recertification costs that could differ from actual results.

As of June 30, 2016, the Company determined that it observed indicators of impairment related to its vessels. This resulted from the rapid deterioration of its second quarter 2016 operating results, as well as the uncertainty regarding future market conditions and the related impact on the Company's projected operating results. For the purposes of calculating the undiscounted cash flows, the Company groups its vessels into two groups, OSVs and MPSVs, and used a probability-weighted undiscounted cash flow projection to test for recoverability. After reviewing the results of this calculation, the Company determined that each of its asset groups has sufficient projected undiscounted cash flows to recover the remaining book value of the Company's long-lived assets within such group. During the second half of 2016, the Company reviewed the assumptions used in preparing the undiscounted cash flow projections and it concluded that such assumptions remain consistent with current market conditions. In addition, the Company has not observed any additional indicators of impairment related to its vessels during the second half of 2016 and the assumptions used to determine undiscounted cash flows remain appropriate. No triggering events occurred in 2015 or 2014 and the Company did not record any impairment losses related to its long-lived assets during those periods. The Company will continue to closely monitor market conditions and potential impairment indicators as long as this market downturn persists.

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HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Recent Accounting Pronouncements

The following table provides a brief description of recent accounting pronouncements that could have a material effect on our financial statements:

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have been adopted
ASU No. 2014-15, "Presentation of Financial Statements - Going Concern"	The standard requires management to evaluate whether there are conditions and events that raise substantial doubt about an entity's ability to continue as a going concern. Early adoption is permitted.	December 31, 2016	The implementation of this new guidance did not have a material impact on the consolidated financial statements.

Standards that have not been adopted
Accounting Standards Update (ASU) No. 2017-04, "Simplifying the Accounting for Goodwill Impairment"	The standard removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 requires prospective application. Early adoption is permitted for any impairment tests performed after January 1, 2017.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on the consolidated financial statements.
ASU No. 2017-01, "Business Combinations" (Topic 805): Clarifying the Definition of a Business	This standard provides guidance to assist entities with evaluating when a set of transferred assets and activities is a business. ASU 2017-01 requires prospective application.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-16, "Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory"	The standard requires the recognition of the tax effects of an intra-entity asset transfers in the period in which the transfer takes place. The new guidance does not apply to intra-entity transfers of inventory. ASU No. 2016-16 requires a modified retrospective approach. Early adoption is permitted.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments"	The standard clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. The new guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. ASU No. 2016-15 requires retrospective application. Early adoption is permitted.	January 1, 2018	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.

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HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have not been adopted
ASU No. 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments"	This standard requires measurement and recognition of expected credit losses for financial assets held. ASU No. 2016-13 requires modified retrospective application. Early adoption is permitted.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.
ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting"	This standard simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeitures and classification of related amounts within the statement of cash flows. Early adoption is permitted.	January 1, 2017	This standard requires excess tax benefits or deficiencies, relating to the vesting of restricted stock unit awards or the exercise of stock options, to be reflected as a component of the tax rate whereas they were previously recognized as equity. This may cause volatility to its effective tax rate as outstanding stock options are exercised or restricted stock awards vest. Additionally, our Consolidated Statements of Cash Flows will include excess tax benefits as an operating activity.
ASU No. 2016-02, "Leases" (Topic 842)	This standard requires lessees to recognize a lease liability and a right-of-use asset for all leases (with the exception of short-term leases) at the commencement date. ASU 2016-02 requires a modified retrospective application. Early adoption is permitted.	January 1, 2019	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2014-09, "Revenue from Contracts with Customers" (Topic 606)	This standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 requires retrospective application.	January 1, 2018	The Company has performed an initial evaluation of this standard and its impact on the financial statements. This included tasks such as identifying contracts, identifying performance obligations and reviewing the applicable revenue streams. In this review, nothing has been identified that would require a change in the current accounting for revenue. The Company will continue to review these new requirements prior to implementation which is expected under the modified retrospective method.

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HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

3. Earnings (Loss) Per Share

Basic earnings (loss) per common share was calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per common share was calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the year plus the effect of dilutive stock options and restricted stock unit awards. Weighted average number of common shares outstanding was calculated by using the sum of the shares determined on a daily basis divided by the number of days in the period. The table below reconciles the Company’s earnings per share (in thousands, except for per share data):

	Year Ended December 31,
	2016			2015		2014
Income (loss) from continuing operations	$	(63,846	)	$	66,821	$	87,907
Income from discontinued operations, net of tax (1)	—			—		618
Net income (loss)	$	(63,846	)	$	66,821	$	88,525
Weighted average number of shares of common stock outstanding	36,248			35,755		36,172
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	—			547		520
Weighted average number of dilutive shares of common stock outstanding	36,248			36,302		36,692
Earnings (loss) per common share:
Basic earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.87	$	2.43
Basic earnings per common share from discontinued operations	—			—		0.02
Basic earnings (loss) per common share	$	(1.76	)	$	1.87	$	2.45
Diluted earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.84	$	2.40
Diluted earnings per common share from discontinued operations	—			—		0.01
Diluted earnings (loss) per common share	$	(1.76	)	$	1.84	$	2.41

⁽¹⁾  On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

⁽²⁾  Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

⁽³⁾  For the years ended December 31, 2016, 2015 and 2014, the 2019 convertible senior notes issued in August 2012 were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of our 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation. See Note 6 for further information.

⁽⁴⁾  Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 8 for further information regarding certain of the Company’s restricted stock unit awards.

4. Defined Contribution Plan

The Company offers a 401(k) plan to all full-time employees. Employees must be at least eighteen years of age and have completed three months of service to be eligible for participation. Participants may elect to defer up to 60% of their compensation, subject to certain statutorily established limits. The Company may elect to make annual matching and profit sharing contributions to the 401(k) plan. In response to weak market conditions, the Company temporarily ceased matching contributions to the 401(k) plan effective January 1, 2015. During the year ended December 31, 2014, the Company made contributions to the 401(k) plan of approximately $6.0 million.

F - 13

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

5. Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	December 31,
	2016			2015
Offshore supply vessels and multi-purpose support vessels	$	2,825,389		$	2,409,221
Non-vessel related property, plant and equipment	132,320			132,034
Less: Accumulated depreciation	(539,561		)	(452,134		)
	2,418,148			2,089,121
Construction in progress	160,240			485,540
	$	2,578,388		$	2,574,661

In November 2011, the Company announced, and later expanded, its fifth OSV newbuild program. This program consisted of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MSPVs. As of December 31, 2016, the Company had placed in service 22 vessels under this newbuild program. During February 2016, the Company announced plans to enhance the marketability of the four then-remaining 310 class MPSVs. The first two of those MPSVs, which were delivered in the third quarter of 2016, were enhanced by increasing the berthing capacity, expanding the cargo carrying capabilities and expanding the work area for ROVs. The functionality of each of the second two MPSVs, which are still under construction, will be increased by adding a 60-foot mid-body plug, installing of an additional crane, increasing the berthing capacity, expanding the cargo-carrying capacities and expanding the work areas for ROVs. These latter two MPSVs have been upgraded to a 400 class designation.

In August 2016, the Company announced that it had reached an agreement with the shipyard to postpone the delivery of the final two 400 class MPSVs to be delivered under this program to the first and third quarters of 2018 without any additional cost to the Company. In addition, the payment terms for the remainder of the contract were adjusted to shift $43.3 million of construction milestone draws from the remainder of 2016 and 2017 into 2018.

Based on current contracts and internal estimates, the aggregate total cost of this program, before construction period interest, is expected to be approximately $1,335.0 million. From the inception of this program through December 31, 2016, the Company has incurred $1,264.0 million, or 94.7%, of total expected project costs.

During 2015, the Company closed on the sale of four 250EDF class OSVs, the HOS Arrowhead, the HOS Black Powder, the HOS Eagleview and the HOS Westwind, which were previously chartered to the U.S. Navy, for cash consideration of $152.0 million. The sale resulted in a pre-tax gain of approximately $44.1 million ($27.6 million after-tax or $0.76 per diluted share). These vessels are now managed by the Company for the U.S. Navy.

6. Long-Term Debt

As of the dates indicated below, the Company had the following outstanding long-term debt (in thousands):

	December 31,
	2016		2015
5.875% senior notes due 2020, net of deferred financing costs of $3,025 and $3,944	$	371,975	$	371,056
5.000% senior notes due 2021, net of deferred financing costs of $4,111 and $5,080	445,889		444,920
1.500% convertible senior notes due 2019, net of original issue discount of $31,093 and $41,600 and deferred financing costs of $3,061 and $4,095	265,846		254,305
Revolving credit facility due 2020	—		—
	$	1,083,710	$	1,070,281

F - 14

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The table below summarizes the Company's cash interest payments (in thousands):

	Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020	$	11,000	April 1 and October 1
5.000% senior notes due 2021	11,300		March 1 and September 1
1.500% convertible senior notes due 2019	2,300		March 1 and September 1

Annual maturities of debt, excluding the potential effects of conditions discussed in Convertible Senior Notes, during each year ending December 31, are as follows (in thousands):

2017	$	—
2018	—
2019	300,000
2020	375,000
2021	450,000
Thereafter	—
	$	1,125,000

2020 Senior Notes

On March 2, 2012, the Company issued $375.0 million in aggregate principal amount of 2020 senior notes, governed by an indenture, or the 2012 indenture. The net proceeds to the Company from the offering were approximately $367.4 million, net of transaction costs. The Company used $259.9 million of such proceeds on March 16, 2012 to repurchase approximately 84% of its outstanding 2014 senior notes pursuant to its tender offer for such notes. The Company used $49.5 million of proceeds on April 30, 2012 to redeem the remaining 16% of the outstanding 2014 senior notes. The repurchase and redemption of the 2014 senior notes resulted in a loss on early extinguishment of debt of approximately $6.0 million in 2012. The remaining proceeds were used for general corporate purposes, including the construction of vessels under the Company's fifth OSV newbuild program. The 2020 senior notes mature on April 1, 2020 and the effective interest rate is 6.08%. No principal payments are due until maturity. Pursuant to a registered exchange offer, the 2020 senior notes issued in March 2012 that were initially sold pursuant to a private placement were exchanged by the holders for 2020 senior notes with substantially the same terms, except that the issuance of the 2020 senior notes in the exchange offer was registered under the Securities Act. The original 2020 senior notes and the similar notes exchanged were issued under and are entitled to the benefits of the same 2012 indenture.

2021 Senior Notes

On March 14, 2013, the Company issued $450.0 million in aggregate principal amount of 2021 senior notes, governed by an indenture, or the 2013 indenture. The net proceeds to the Company from the offering were approximately $442.4 million, net of transaction costs. The Company used $252.7 million of such proceeds to repurchase approximately 94% of the outstanding 2017 senior notes pursuant to its tender offer for such notes. The Company used approximately $16.6 million of proceeds on May 13, 2013 to redeem the remaining 6% of the outstanding 2017 senior notes. The repurchase and redemption of the 2017 senior notes resulted in a loss on early extinguishment of debt of approximately $25.8 million in 2013. The remaining proceeds have been available for general corporate purposes, including funding for the acquisition, construction or retrofit of vessels. The 2021 senior notes mature on March 1, 2021 and the effective interest rate is 5.21%. No principal payments are due until maturity. Pursuant to a registered exchange offer, the 2021 senior notes issued in March 2013 that were initially sold pursuant to a private placement were exchanged by the holders for 2021 senior notes with substantially the same terms, except that the issuance of the 2021 senior notes in the exchange offer was registered under the Securities Act. The original 2021 senior notes and the similar notes exchanged were issued under and are entitled to the benefits of the same 2013 indenture.

F - 15

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The 2020 senior notes and 2021 senior notes are senior unsecured obligations and rank equally in right of payment with other existing and future senior indebtedness and senior in right of payment to any subordinated indebtedness that may be incurred by the Company in the future. Hornbeck Offshore Services, Inc., as the parent company issuer of the 2020 senior notes and the 2021 senior notes, has no independent assets or operations other than its ownership interest in its subsidiaries and affiliates. There are no significant restrictions on the Company’s ability, or the ability of any guarantor, to obtain funds from its subsidiaries by such means as a dividend or loan. The Company may, at its option, redeem all or part of the 2020 senior notes or 2021 senior notes from time to time at specified redemption prices and subject to certain conditions required by the indentures. The Company is permitted under the terms of the indentures to incur additional indebtedness in the future, provided that certain financial conditions set forth in the indentures are satisfied by the Company.

2019 Convertible Senior Notes

On August 13, 2012, the Company issued $300.0 million of 2019 convertible senior notes, which mature on September 1, 2019. Because the 2019 convertible senior notes are considered to be cash convertible debt, the Company has separately accounted for the liability and equity components of the 2019 convertible senior notes by allocating the $300.0 million in proceeds from the issuance between the liability component and the embedded conversion option, or the equity component. The allocation was conducted by estimating an interest rate at the time of issuance of the 2019 convertible senior notes for similar debt instruments that do not include an embedded conversion feature. A non-convertible interest rate of 5.75% was used to compute the initial fair value of the liability component of $227.6 million. For purposes of the fair value measurement, the Company determined that the valuation of the 2019 convertible senior notes falls under Level 2 of the fair value hierarchy. The excess of the $300.0 million of proceeds from the issuance of the 2019 convertible senior notes over the $227.6 million initial amount allocated to the liability component, or $72.4 million, was allocated to the embedded conversion option, or equity component. This excess was treated as an imputed original issue discount and is being amortized through interest expense, using the effective interest method, over the seven-year term of the 2019 convertible senior notes, which runs through September 1, 2019. The effective interest rate for these notes is 6.23%.

The initial conversion rate of the 2019 convertible senior notes is 18.5718 shares per $1,000 principal amount of notes, which equates to a conversion price of approximately $53.85 per share. The conversion rate was based on the last reported sale price of the Company’s common shares on the New York Stock Exchange of $39.16 on August 7, 2012. The conversion rate will be subject to adjustment in some events but will not be adjusted for accrued interest. In addition,

following certain corporate transactions that constitute “fundamental changes” (as defined in the indenture for the 2019 convertible senior notes), the conversion rate will be increased for holders who elect to convert notes in connection with

such corporate transactions in certain circumstances.

F - 16

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The 2019 convertible senior notes are convertible based on the applicable conversion rate only under the following circumstances:

• prior to June 1, 2019, during any fiscal quarter (and only during that fiscal quarter) commencing after December 31, 2012, if the last reported sale price of the Company’s common stock is greater than or equal to 135% of the conversion price for at least 20 trading days in the period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter; or

• prior to June 1, 2019, during the 5 business-day period after any 10 consecutive trading-day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day in the measurement period was less than 95% of the product of the last reported sale price of the Company’s common stock and the conversion rate on such trading day; or

• upon the occurrence of specified corporate transactions, as defined in the indenture governing the 2019 convertible senior notes; or

• beginning on June 1, 2019 until the close of business on the second scheduled trading day preceding the maturity date.

Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election.

If the holders of the 2019 convertible senior notes exercise the conversion provisions of the 2019 convertible senior notes and the Company elects to settle such conversions partially in cash (which it presently intends to do at least up to the principal amount of the notes), the Company will need to remit such cash amount to the converting holders. For that reason, in any period during which the 2019 convertible senior notes are convertible as provided above, the Company would classify the entire principal amount of the outstanding 2019 convertible senior notes as a current liability in the respective quarter. This evaluation of the classification of amounts outstanding associated with the 2019 convertible senior notes will occur every calendar quarter.

The 2019 convertible senior notes are not redeemable at the option of the Company prior to their maturity. No sinking fund is provided for the 2019 convertible senior notes and the 2019 convertible senior notes are not subject to legal defeasance. If the Company experiences specified types of corporate transactions, including certain change of control events or a de-listing of the Company’s common stock, holders of the 2019 convertible senior notes may require the Company to purchase all or a portion of their 2019 convertible senior notes. Any repurchase of the convertible senior notes pursuant to these provisions will be for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the purchase date.

In connection with the sale of the 2019 convertible senior notes, the Company entered into convertible senior note hedge transactions with respect to its common stock with affiliates of the initial purchasers of the notes, Barclays, Inc., JP Morgan Chase and Wells Fargo Bank, or the counterparties. Each of the 2019 convertible senior note hedge transactions is a privately-negotiated transaction that is economically equivalent to the purchase of call options on the Company’s common stock with strike prices equal to the conversion price of the 2019 convertible senior notes, and is intended to mitigate dilution to the Company’s stockholders and/or offset cash payment due upon the potential future conversion of the 2019 convertible senior notes. Under the 2019 convertible senior note hedge transactions, subject to customary anti-dilution provisions, the counterparties are required to deliver to the Company the approximate number of shares of the Company’s common stock and/or an amount of cash that the Company is obligated to deliver to the holders of the 2019 convertible senior notes assuming the conversion of such notes.

The Company also entered into separate privately-negotiated warrant transactions, whereby the Company sold to each of the counterparties call options to acquire approximately the same number of shares of its common stock underlying the convertible senior note hedge transactions, subject to customary anti-dilution adjustments, at a strike price of $68.53 per share of common stock, which represented a 75.0% premium over the closing price of the Company’s shares of common stock on August 7, 2012. Upon the exercise of the warrants, if the market price of the common stock exceeds the strike price of the warrants on any day within the valuation period, the Company will be required to deliver the

F - 17

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

corresponding value to the counterparties, at its option in cash or shares of its common stock. The 2019 convertible senior note hedge and warrant transactions are separate and legally distinct instruments that bind the Company and the counterparties and have no binding effect on the holders of the 2019 convertible senior notes.

For income tax reporting purposes, the Company has elected to integrate the 2019 convertible senior notes and the note hedge transactions. Integration of the 2019 convertible senior note hedge with the 2019 convertible senior notes creates an in-substance original issue debt discount for income tax reporting purposes and, therefore, the cost of the 2019 convertible senior note hedge is accounted for as interest expense over the term of the 2019 convertible senior notes for income tax reporting purposes. The associated income tax deductions will be recognized in the period that the deduction is taken for income tax reporting purposes. The Company has also treated the proceeds from the sale of warrants as a non-taxable increase in additional paid-in capital in stockholders’ equity.

The Company used a portion of the $290.8 million in net proceeds of the 2019 convertible senior notes offering, along with a portion of the $48.2 million in proceeds from the sale of warrants, to fund the $73.0 million cost of convertible senior note hedge transactions. The Company used a portion of the remaining net proceeds of approximately $266.0 million from the sale of the 2019 convertible senior notes and the sale of the warrants to retire its 2026 convertible senior notes, which were converted or redeemed by the Company in November 2013.

The Company incurred $9.3 million of fees and other costs related to the issuance of the 2019 convertible senior notes. These fees and other origination costs have been allocated to the liability and equity components of the 2019 convertible senior notes in proportion to their allocated values. Approximately $2.2 million of these fees and other origination costs were recorded as a reduction in additional paid-in capital. The remaining $7.1 million of fees and other costs are being amortized as interest expense over the seven-year term of the 2019 convertible senior notes, which runs through September 1, 2019.

Hornbeck Offshore Services, Inc., as the parent company issuer of the 2019 convertible senior notes, has no independent assets or operations other than its ownership interest in its subsidiaries and affiliates. There are no significant restrictions on the Company’s ability or the ability of any guarantor to obtain funds from its subsidiaries by such means as a dividend or loan. The 2019 convertible senior notes are general unsecured, senior obligations of the Company, ranking equally in right of payment with all of its existing and future senior indebtedness, including its 2020 and 2021 senior notes.

The 2019 convertible senior notes, the 2020 senior notes and the 2021 senior notes are guaranteed by certain of the Company’s subsidiaries. The guarantees are full and unconditional, joint and several, and prior to the fourth quarter of 2015, all of the Company's non-guarantor subsidiaries were minor as defined in the Securities and Exchange Commission regulations.

Revolving Credit Facility

On July 29, 2016, the Company amended its existing revolving credit facility. The amended facility provides continued access to a reduced level of standby liquidity for working capital and general corporate purposes, including acquisitions, newbuild and conversion programs and other capital expenditures. The changes to the Company’s revolving credit facility were effective July 29, 2016, and commenced with the fiscal quarter ending September 30, 2016. The more significant changes to the facility are noted below:

• reduce the borrowing base from $300.0 million to $200.0 million;

• increase the unused commitment fee to 50 basis points for all pricing levels;

• increase the London Interbank Offered Rate, or LIBOR, spreads on funded borrowings by 25 basis points for all pricing levels;

• increase the minimum collateral-to-loan value ratio from 150% of the borrowing base to 200% of the borrowing base, which resulted in a decrease in the fair value of collateral pledged from $450.0 million to $400.0 million;

• delay the previously scheduled step-down in the total debt-to-capitalization ratio, as defined, from 55% to 50% by six quarters to commence with the fiscal quarter ending September 30, 2018;

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HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

• reduce the minimum interest coverage ratio from 3.00x to 1.00x with a step-up to 1.25x for the fiscal quarter ending September 30, 2018 and a step-up to 1.50x for the fiscal quarter ending March 31, 2019;

• allow the Company the option of making a one-time election to suspend the interest coverage ratio for a holiday period of no more than four quarters, ending no later than December 31, 2017, with a single permitted rescission. If the Company elects to exercise the interest coverage holiday, then the borrowing base will be capped at $75.0 million during the holiday and the LIBOR spreads for funded borrowings will be increased by an additional 50 basis points during and after the interest coverage holiday;

• include an anti-cash hoarding provision that limits the Company's cash balance to no more than $50.0 million at any time during which the revolving credit facility is drawn;

• increase minimum liquidity (cash and credit facility availability) required for prepayment of the Company's 2019 convertible senior notes, 2020 senior notes, and 2021 senior notes from $100.0 million to $150.0 million subject to a maximum senior secured leverage ratio of 2-to-1;

• permit the Company to create one or more Investment Entities, as defined. The Investment Entities would be capitalized (i) by the Company, by transferring certain vessels identified in the First Amendment and (ii) by one or more unaffiliated third parties, by depositing cash, with the cash funding being available for acquisitions;

• amend the definitions of EBITDA and Pro Forma EBITDA to provide that, commencing with the earlier of (a) the first full fiscal quarter after the expiration of the interest coverage holiday and (b) the fiscal quarter ending March 31, 2018, or the Applicable Period, and until the third immediately following fiscal quarter thereafter, EBITDA and Pro Forma EBITDA, as applicable, shall mean, with respect to the Company and its consolidated subsidiaries, (a) for the Applicable Period, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarter multiplied by four, (b) for the Applicable Period and the immediately following fiscal quarter, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarters multiplied by two, and (c) for the Applicable Period and the two immediately following fiscal quarters, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarters multiplied by one and one-third;

• reduce the amount of liens permitted to secure debt (other than the Amended Facility) of any loan party from $50.0 million at any one time to $15.0 million, and to prohibit such liens during the interest coverage holiday;

• condition Restricted Payments, as defined, on pro forma compliance with the interest coverage ratio and the total debt-to-capitalization ratio and compliance with a maximum senior secured leverage ratio of 2-to-1;

• increase the amount of cash or cash equivalents on deposit or unused availability under the Amended Facility or a combination of both from $20.0 million to $100.0 million and require a maximum senior secured leverage ratio of 2-to-1 in order to permit a loan party to merge with another person, acquire or form a new subsidiary, make an investment (other than in an Investment Entity) or acquire any vessel or other capital assets; and

• limit sales or other dispositions of property or subsidiaries owning properties, other than inventory, certain equipment or investments in the Investment Entities, to (i) less than twenty percent of the consolidated net tangible assets of the Company if at the time of such sale or disposition the senior secured leverage ratio is less than or equal to 2-to-1, or (ii) less than ten percent of the consolidated net tangible assets of the Company if at the time of such sale or disposition the senior secured leverage ratio is greater than 2-to-1.

Other than these key changes, all other definitions and substantive terms in the Company’s credit agreement governing its revolving credit facility were unchanged by the July 2016 amendment and remain in effect through the remaining life of the facility.

As of December 31, 2016, there were no amounts drawn under the Company’s $200.0 million revolving credit facility and no letters of credit were outstanding. As of December 31, 2016, the Company was in compliance with all financial covenants contained in its amended revolving credit facility.

The credit agreement governing the amended revolving credit facility and the indentures governing the Company’s 2020 senior notes and 2021 senior notes impose certain operating and financial restrictions on the Company. Such restrictions affect, and in many cases limit or prohibit, among other things, the Company’s ability to incur additional

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

indebtedness, make capital expenditures, redeem equity, create liens, sell assets and make dividend or other restricted payments.

The Company estimates the fair value of its 2020 senior notes, 2021 senior notes and 2019 convertible senior notes by primarily using quoted market prices. The fair value of the Company’s revolving credit facility, when there are outstanding balances, approximates its carrying value. Given the observable nature of the inputs to these estimates, the fair values presented below for long-term debt have been assigned a Level 2, of the three-level valuation hierarchy. As of the dates indicated below, the Company had the following face values, carrying values and fair values (in thousands):

	December 31, 2016						December 31, 2015
	Face Value		Carrying Value		Fair Value		Face Value		Carrying Value		Fair Value
5.875% senior notes due 2020	$	375,000	$	371,975	$	270,938	$	375,000	$	371,056	$	257,813
5.000% senior notes due 2021	450,000		445,889		301,343		450,000		444,920		308,250
1.500% convertible senior notes due 2019	300,000		265,846		216,195		300,000		254,305		170,340
	$	1,125,000	$	1,083,710	$	788,476	$	1,125,000	$	1,070,281	$	736,403

Capitalized Interest

Interest expense excludes capitalized interest related to the construction or conversion of vessels in the approximate amount of $16.7 million, $24.7 million, and $33.2 million, for the years ended December 31, 2016, 2015, and 2014, respectively.

7. Stockholders’ Equity

Preferred Stock

The Company’s certificate of incorporation authorizes 5.0 million shares of preferred stock. The Board of Directors has the authority to issue preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof, including dividend rights, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences and the number of shares constituting any series or the designation of such series, without further vote or action by the Company’s stockholders.

Stockholder Rights Plan

On July 1, 2013, the Company’s Board of Directors implemented a stockholder rights plan establishing one right for each outstanding share of common stock. The rights become exercisable, and transferable apart from the Company’s common stock, 10 business days following a public announcement that a person or group has acquired beneficial ownership of, or has commenced a tender or exchange offer for, 10% or more of the Company’s common stock. This stockholder rights plan is substantially similar to the Company's prior stockholder rights plan that expired on June 17, 2013.

Repurchases of Common Stock

On October 28, 2014, the Company's Board of Directors authorized the Company to repurchase up to $150.0 million in shares of its common stock using different methods including, but not limited to, open-market purchases, privately negotiated transactions, accelerated share repurchases and Rule 10b5-1 trading plans. The timing and amount of the repurchases will depend on several factors, such as market conditions, applicable legal requirements, available liquidity, the discretion of management and other appropriate factors. The repurchase program does not obligate the Company to acquire any particular amount of common stock and may be modified, suspended or discontinued at any time. During the fourth quarter of 2014, the Company repurchased and retired 891,396 shares at an average price of $28.05 per share. The repurchased shares cost a total of $25.0 million and represent roughly 2.5% of the Company's total shares outstanding prior to the commencement of the program. The Company has not repurchased any additional shares subsequent to December 31, 2014.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

8. Stock-Based Compensation

Incentive Compensation Plan

The Company’s stock-based incentive compensation plan covers a maximum of 4.95 million shares of common stock that allows the Company to grant restricted stock awards, restricted stock unit awards, or collectively restricted stock, stock options, stock appreciation rights and fully-vested common stock to officers, other employees and directors. As of December 31, 2016, there were 542,266 shares available for future issuance to employees under the incentive compensation plan. The issuance of shares of common stock under the incentive compensation plan has been registered on Form S-8 with the Securities and Exchange Commission.

The financial impact of stock-based compensation expense related to the Company’s incentive compensation plan on its operating results are reflected in the table below (in thousands, except for per share data):

	Year Ended December 31,
	2016		2015		2014
Income before taxes	$	9,983	$	10,293	$	10,324
Net income	$	5,829	$	6,454	$	6,471
Earnings per common share:
Basic	$	0.16	$	0.18	$	0.18
Diluted	$	0.16	$	0.18	$	0.18

The accounting rules also require the benefits of tax deductions in excess of recognized compensation expense to be reported as financing cash flows, rather than as operating cash flows. The Company recorded the impact on cash flows from operating activities for tax shortfalls of approximately $1.9 million and $0.6 million for the years ended December 31, 2016 and 2015, respectively. The Company recorded the impact on cash flows used in financing activities for tax windfalls of approximately $0.3 million for the year ended December 31, 2014. Net cash proceeds from the exercise of stock options were $0.0 million, $0.1 million and $1.4 million for the years ended December 31, 2016, 2015 and 2014, respectively. The income tax expense (benefit) from stock option exercises and restricted stock vesting was $(1.9) million, $(0.6) million and $0.3 million for the respective periods.

Stock Options

The Company is authorized to grant stock options under its incentive compensation plan in which the purchase price of the stock subject to each option is established as the closing price on the New York Stock Exchange of the Company’s common stock on the date of grant and accordingly is not less than the fair market value of the stock on the date of grant. All options granted expire ten years after the date of grant, have an exercise price equal to or greater than the actual or estimated market price of the Company’s stock on the date of grant and vest over a three-year period. The Company has not granted stock options to any directors, executive officers or employees since 2011. The Company has recorded approximately $0.0 million, $0.0 million and $0.1 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with stock options.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table represents the Company’s stock option activity for the year ended December 31, 2016 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2016	304		$	28.11	3.2	$	—
Grants	—		—		—	—
Exercised	—		—		—	—
Forfeited or expired	(119	)	33.15		n/a	n/a
Options outstanding at December 31, 2016	185		$	24.86	4.1	$	—
Exercisable options outstanding at December 31, 2016	185		$	24.86	4.1	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2015 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2015	345		$	27.98	3.7	$	59
Grants	—		—		—	—
Exercised	(1	)	22.28		n/a	2
Forfeited or expired	(40	)	27.27		n/a	n/a
Options outstanding at December 31, 2015	304		$	28.11	3.2	$	—
Exercisable options outstanding at December 31, 2015	304		$	28.11	3.2	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2014 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2014	405		$	27.16	4.2	$	8,951
Grants	—		—		—	—
Exercised	(60	)	22.49		n/a	684
Forfeited or expired	—		—		—	—
Options outstanding at December 31, 2014	345		$	27.98	3.7	$	59
Exercisable options outstanding at December 31, 2014	345		$	27.98	3.7	$	59

Restricted Stock

Equity-Settled Restricted Stock

The Company’s incentive compensation plan allows the Company to issue restricted stock units, with either performance-based or time-based vesting provisions. The Company has granted performance-based restricted stock unit awards, which calculates the shares to be received based on the Company’s achievement of certain internal performance criteria over a three-year period as defined by the restricted stock unit agreement governing such awards. Performance for these types of awards has historically been measured by a number of factors that may differ from year to year, including such examples as the Company achieving a targeted return on invested capital, operating profit margin compared to peers, and safety record. The actual number of shares that could be received by the award recipients for the years in question can range from 0% to 150% of the Company’s base share awards depending on the number and/or

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

extent of performance goals attained by the Company. Compensation expense related to performance-based restricted stock unit awards is recognized over the period the restrictions lapse, from one to three years, based on the market price of the Company's stock on the date of grant applied to the shares that are expected to vest. The compensation expense related to time-based restricted stock unit awards, which is amortized over a one to three-year vesting period, is determined based on the market price of the Company’s stock on the date of grant applied to the total shares that are expected to fully vest. As of December 31, 2016, the Company had unamortized stock-based compensation expense of $4.6 million, which will be recognized on a straight-line basis over the remaining vesting period, or 1.1 years. In addition, the Company has recorded approximately $6.8 million, $9.3 million and $9.0 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with restricted stock-based unit awards.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2016	726		$	30.12
Granted during the period	537		6.44
Change in estimated payout of performance unit awards(1)	(95	)	27.52
Cancellations during the period	—		—
Vested	(348	)	23.50
Outstanding, as of December 31, 2016	820		$	17.72

⁽¹⁾    Annually the Company reviews the performance compared to pre-determined targets for outstanding performance unit awards. Based on current projections, the Company may increase or decrease the anticipated payout based on its historical operating results and near-term projections.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2015	590		$	37.13
Granted during the period(1)	479		21.40
Cancellations during the period	(104	)	21.84
Vested	(239	)	33.60
Outstanding, as of December 31, 2015	726		$	30.12

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2014	570		$	31.61
Granted during the period(1)	274		42.61
Cancellations during the period	—		—
Vested	(254	)	30.68
Outstanding, as of December 31, 2014	590		$	37.13

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

Cash-Settled Restricted Stock

The Company’s incentive compensation plan allows the Company to issue restricted stock units with cash-settled vesting provisions. The compensation expense related to cash-settled restricted stock unit awards is amortized over a vesting period of up to three years, as applicable, and is determined based on the market price of the Company’s stock on the date of grant applied to the total shares that are expected to fully vest. The cash-settled restricted stock units are re-measured quarterly based on the period-end market price of the Company's common stock and are classified as a liability, due to the settlement of these awards in cash. As of December 31, 2016, the Company had unamortized cash-settled restricted stock compensation expense of $5.1 million, which will be recognized on a straight-line basis over the remaining vesting period, or 1.8 years. In addition, the Company recorded approximately $2.6 million, $(0.2) million, and $(0.1) million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with cash-settled restricted stock unit awards.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2016	82		$	30.61
Granted during the period(2)	991		6.14
Cancellations during the period	(5	)	19.05
Vested	(15	)	34.32
Outstanding, as of December 31, 2016	1,053		$	7.60

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

⁽²⁾  Includes only the base shares awarded for both time-based and performance based awards. The performance-based awards have the potential to vest at up to 150% of the aggregate total of the base share awards.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2015	153		$	38.43
Granted during the period	47		21.84
Cancellations during the period	(1	)	30.87
Vested	(117	)	37.25
Outstanding, as of December 31, 2015	82		$	30.61

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2014	139		$	37.25
Granted during the period	35		43.00
Cancellations during the period	(3	)	39.14
Vested	(18	)	37.88
Outstanding, as of December 31, 2014	153		$	38.43

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

Employee Stock Purchase Plan

On May 3, 2005, the Company established the Hornbeck Offshore Services, Inc. 2005 Employee Stock Purchase Plan, or ESPP, which was adopted by the Company’s Board of Directors and approved by the Company’s stockholders. Under the ESPP, the Company is presently authorized to issue up to 2.2 million shares of common stock to eligible employees of the Company and its designated subsidiaries. Employees have the opportunity to purchase shares of the Company’s common stock at periodic intervals through accumulated payroll deductions that will be applied at semi-annual intervals to purchase shares of common stock at a discount from the market price as defined by the ESPP. The ESPP is designed to satisfy the requirements of Section 423 of the Internal Revenue Code of 1986, as amended, and thereby allows participating employees to defer recognition of taxes when purchasing the shares of common stock at a 15% discount under the ESPP. The Company has an effective Registration Statement on Form S-8 with the Commission registering the issuance of shares of common stock under the ESPP. As of December 31, 2016, there were 1.1 million shares available for future issuance to employees under the ESPP. The Company recorded approximately $0.6 million, $1.2 million, and $1.2 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with the ESPP.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The fair value of the employees’ stock purchase rights granted under the ESPP was estimated using the Black-Scholes model with the following assumptions for the years ended December 31, 2016 and 2015:

	2016			2015
Dividend yield	—		%	—		%
Expected volatility	91.6		%	61.3		%
Risk-free interest rate	0.5		%	0.3		%
Expected term (months)	6			6
Weighted-average grant-date fair value per share	$	3.14		$	4.86

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

9. Income Taxes

The net long-term deferred tax liabilities in the accompanying consolidated balance sheets include the following components (in thousands):

	Year Ended December 31,
	2016			2015			2014
Deferred tax liabilities:
Fixed assets	$	490,221		$	472,817		$	489,060
Deferred charges and other liabilities	10,908			11,317			18,013
Total deferred tax liabilities	501,129			484,134			507,073
Deferred tax assets:
Net operating loss carryforwards	(111,147		)	(52,374		)	(116,676		)
Allowance for doubtful accounts	(763		)	(1,036		)	(1,330		)
Stock-based compensation expense	(4,033		)	(4,830		)	(4,246		)
Alternative minimum tax credit carryforward	(20,863		)	(20,863		)	(20,863		)
Foreign tax credit carryforward	(17,554		)	(17,972		)	(12,332		)
Other	(6,044		)	(5,440		)	(5,676		)
Total deferred tax assets	(160,404		)	(102,515		)	(161,123		)
Valuation allowance	2,295			—			1,011
Total deferred tax liabilities, net	$	343,020		$	381,619		$	346,961

The components of the income tax expense follow (in thousands):

	Year Ended December 31,
	2016			2015		2014
Current tax expense (benefit):
U.S.	$	709		$	—	$	—
Foreign	(257		)	5,671		1,927
Total current tax expense	452			5,671		1,927
Deferred tax expense:
U.S.	(45,958		)	34,086		50,440
Total tax expense (benefit)	$	(45,506	)	$	39,757	$	52,367

Income from continuing operations before income taxes, based on jurisdiction earned, was as follows (in thousands):

	Year Ended December 31,
	2016			2015		2014
U.S.	$	(93,704	)	$	65,894	$	105,066
Foreign	(15,648		)	40,684		35,208
Total income (loss) from continuing operations before income taxes	$	(109,352	)	$	106,578	$	140,274

At December 31, 2016, the Company had federal tax net operating loss carryforwards of approximately $315.2 million, which will expire in 2031 through 2036 and foreign tax credit carryforwards of approximately $16.4 million, which will expire in 2019 through 2026. The Company has state tax net operating loss carryforwards of approximately $88.5

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

million, which will expire in 2030 through 2036 and can only be utilized if the Company generates taxable income in that particular jurisdiction.

As a result of the sale of the Downstream segment during the third quarter of 2013, the Company believed that certain state operating loss carryforwards might not be realizable and thus recorded a valuation allowance of $0.9 million for the year ended December 31, 2013. During 2014, the Company recorded an additional valuation allowance of $0.1 million related to those state operating losses. During 2015, the total valuation allowance of $1.0 million was reversed as these state operating losses were written off upon ceasing to do business in those particular jurisdictions. During the fourth quarter of 2016, the Company recorded a valuation allowance of $2.3 million related to foreign tax credits expiring in 2019. The Company has weighed the evidence, primarily net book income projections, and has concluded that it is more likely than not that the Company will not generate sufficient taxable income to utilize these credits by their expiration date of December 31, 2019.

The Company is no longer subject to tax audits by federal, state or local taxing authorities for years prior to 2012. The Company has ongoing examinations by various foreign tax authorities but does not believe that the results of these examinations will have a material adverse effect on the Company’s financial position or results of operations.

The following table reconciles the difference between the Company’s income tax provision calculated at the federal statutory rate of 35% and the actual income tax provision (in thousands):

	Year Ended December 31,
	2016			2015			2014
Statutory rate	$	(38,274	)	$	37,302		$	49,096
State taxes, net	(1,094		)	1,066			1,403
Non-deductible expense	1,070			1,440			1,927
Valuation allowance	2,295			(1,011		)	99
Income excluded from U.S. taxable income	(9,478		)	—			—
Foreign taxes and other	(25		)	960			(158		)
	$	(45,506	)	$	39,757		$	52,367

Due to a favorable election included in the Company's 2015 tax return, which was filed during the fourth quarter of 2016, the results of one of the Company's vessels was excluded from U.S. taxable income and was taxed based on its daily notional shipping income, as defined. This resulted in a favorable impact on deferred tax expense of $9.5 million. The Company does not anticipate having any vessels qualify for this election in the foreseeable future.

10. Commitments and Contingencies

Vessel Construction

In November 2011, the Company announced, and later expanded, its fifth OSV newbuild program. This program consisted of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MPSVs. As of December 31, 2016, the Company had placed in service 22 vessels under such program. The two remaining vessels under this 24-vessel domestic newbuild program are currently expected to be placed in service during 2018. Based on current contracts and internal estimates, the aggregate total cost of this program, before construction period interest, is expected to be approximately $1,335.0 million. From the inception of this program through December 31, 2016, the Company had incurred construction costs of approximately $1,264.0 million, or 94.7%, of total expected project costs.

Operating Leases

The Company is obligated under certain operating leases for office space and shore-base facilities. The Covington facility lease provides for an initial term expiring in September 2025 with three additional five-year renewal period options. The Company leases two adjacent shore-base facilities in Port Fourchon. At December 31, 2016, the leases had

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

approximately two years remaining on their existing terms and the Company has multiple renewal options on such facilities. Rent expense related to operating leases was approximately $4.0 million, $4.1 million and $3.9 million for the years ending December 31, 2016, 2015 and 2014, respectively.

Future minimum payments under noncancelable leases for years subsequent to 2016 are as follows (in thousands): 

Year Ended December 31,
2017	$	2,826
2018	2,377
2019	2,409
2020	2,456
2021	2,524
Thereafter	24,662
Total	$	37,254

Contingencies

In the normal course of its business, the Company becomes involved in various claims and legal proceedings in which monetary damages are sought. It is management’s opinion that the Company’s liability, if any, under such claims or proceedings would not materially affect the Company's financial position or results of operations. The Company insures against losses relating to its vessels, pollution and third party liabilities, including claims by employees under Section 33 of the Merchant Marine Act of 1920, or the Jones Act. Third party liabilities and pollution claims that relate to vessel operations are covered by the Company’s entry in a mutual protection and indemnity association, or P&I Club, as well as by marine liability policies in excess of the P&I Club’s coverage. The Company provides reserves for any individual claim deductibles for which the Company remains responsible by using an estimation process that considers Company-specific and industry data, as well as management’s experience, assumptions and consultation with outside counsel. As additional information becomes available, the Company will assess the potential liability related to its pending claims and revise its estimates. Although historically revisions to such estimates have not been material, changes in estimates of the potential liability could materially impact the Company’s results of operations, financial position or cash flows.

During 2013, the Company commenced the process of assigning the in-country vessel management services for its four vessels operating in Brazil from a third party provider to a wholly-owned subsidiary of the Company. As a result, this assignment may be interpreted by local authorities as a new importation of these vessels resulting in an importation assessment ranging from $0.5 million to $3.5 million. The Company disagrees with this interpretation. During the third quarter of 2015, the Brazilian court ruled in the Company's favor related to these claims and this decision has been appealed to a higher court. As of December 31, 2016, these potential duties have not been assessed or recorded in its financial statements. While the Company cannot estimate the amounts or timing of the resolution of this matter, the Company believes that the outcome will not have a material impact on its liquidity or financial position, but the ultimate resolution could have a material impact on its interim or annual results of operations. 

During 2012, a customer, ATP Oil and Gas, Inc., initiated a reorganization proceeding under Chapter 11 of the United States Bankruptcy Code, which in June 2014 was converted to a Chapter 7 case. Pre-petition receivables from ATP were $4.8 million and the Company has recorded $0.9 million in reserves. The Company believes its claim is secured under the Louisiana Oil Well Lien Act. A legal challenge related to the Company's liens has been raised in the bankruptcy proceedings by parties whose interests are affected by the liens. The Company, together with its outside legal counsel, believe its lien position is valid, but the Bankruptcy Court has disagreed. The matter is now being reviewed on appeal by the federal district court in Houston, Texas. An unfavorable final judgment would render the Company's position to that of an unsecured creditor in the bankruptcy proceeding. While the Company believes that the net receivables are collectible based on its position with respect to its liens, it will continue to monitor the proceedings, which may result in actual collections that may materially differ from the current estimate.

Vessel charters with Petrobras included limitations regarding fuel consumption. Petrobras had asserted claims against the Company relating to excess fuel consumption in 2010 and 2011. The Company’s exposure for these

F - 29

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

assessments, net of amounts accrued, was in the range of approximately $0.5 million to $3.0 million. The Company disagreed with a majority of these assessments. During the second quarter of 2015, the Brazilian court ruled in the Company's favor related to these claims. Subsequent to this ruling, Petrobras had filed and was denied multiple appeals. Petrobras had requested a final review of the case by the Supreme Court and, during the fourth quarter of 2016, this request was denied.

11. Deferred Charges

Deferred charges include the following (in thousands):

	Year Ended December 31,
	2016		2015
Deferred drydocking costs, net of accumulated amortization of $34,313 and $41,784 respectively	$	13,808	$	29,228
Prepaid lease expense, net of amortization of $1,700 and $1,542, respectively	2,688		2,847
Revolving credit facility deferred financing costs, net of accumulated amortization of $349 and $4,070 respectively	2,581		3,198
Total	$	19,077	$	35,273

12. Other Accrued Liabilities

Other accrued liabilities include the following (in thousands):

	Year Ended December 31,
	2016		2015
Accrued lease expense	$	4,763	$	4,339
Deferred revenue	2,245		5,734
Current taxes payable	215		3,958
Other	2,787		9,581
Total	$	10,010	$	23,612

13. Major Customers

In the years ended December 31, 2016, 2015, and 2014, revenues from the following customers represent 10% or more of consolidated revenues:

	Year Ended December 31,
	2016			2015			2014
Customer A	21	%		20	%		14	%
Customer B	15	%		n/a		(1)	n/a		(1)
Customer C	13	%		n/a		(1)	n/a		(1)
Customer D	n/a		(1)	10	%		n/a		(1)

⁽¹⁾  Customers represent less than 10% of consolidated revenue in each such year.

14. Discontinued Operations

On August 29, 2013, the Company closed the sale of substantially all of the assets and business of its Downstream segment's tug and tank barge fleet. Excluded from the sale were three older, lower-horsepower tugs considered to be non-core assets. During the year ended December 31, 2014, the remaining tugs were sold for net cash proceeds of $1.6

F - 30

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

million. These latter sales resulted in a pre-tax gain of approximately 0.9 million ($0.6 million after-tax or $0.02 per diluted share). The historical results for the Downstream segment and the gain on the sale of the three tugs have been presented as discontinued operations for 2014, the only applicable period in the accompanying condensed consolidated financial statements.

Summarized results of the Downstream segment from discontinued operations are as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Revenue	$	—	$	—	$	12
Gain on sale of assets	—		—		867
Operating Income	—		—		555
Income before income taxes	—		—		966
Income tax expense	—		—		348
Income from discontinued operations	—		—		618

At the closing of the sale of the tug and barge assets and the Downstream business in 2013, the Company entered into transition service agreements with Genesis to facilitate the transition of the sale of the business, including ship management agreements and a crew management agreement, pursuant to which the Company provided services related to the operation and management of certain vessels as well as supplying some of the marine crews for those vessels during the transition period. As of December 31, 2014, all of the transition service agreements had terminated.

15. Employment Agreements

The Company has employment agreements with certain members of its executive management team. These agreements include, among other things, contractually stated base level salaries and a structured cash incentive compensation program dependent upon the Company achieving certain targeted financial results. The agreements typically provide for certain targets such as an EBITDA target, an Operating Margin target and a Safety target, which may be varied from time to time by agreement between the Company and the management executive, as well as a discretionary component. In the event such a member of the executive management team is terminated due to certain events as defined in such officer’s agreement, the employee will continue to receive salary, bonus and other payments for the full remaining term of the agreement. The current term of these employment agreements expires on December 31, 2019 and automatically extends each year thereafter on January 1st, for an additional year.

16. Condensed Consolidating Financial Statements of Guarantors

The following tables present the condensed consolidating historical financial statements as of December 31, 2016 and 2015, and for each of the two years ended December 31, 2016, for the domestic subsidiaries of the Company that serve as guarantors of the Company's 2019 convertible senior notes, 2020 senior notes and 2021 senior notes and the financial results for the Company's subsidiaries that do not serve as guarantors. The guarantor subsidiaries of the 2019 convertible senior notes, 2020 senior notes and 2021 senior notes are 100% owned by the Company. The guarantees are full and unconditional and joint and several. The guarantees are full and unconditional and joint and several and, prior to 2015, all of the Company's non-guarantor subsidiaries were minor as defined in the Securities and Exchange Commission regulations. The non-guarantor subsidiaries of such notes include all of the Company's foreign subsidiaries.

F - 31

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2016
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	9	$	212,196	$	4,822		$	—		$	217,027
Accounts receivable, net of allowance for doubtful accounts of $2,120	—		30,846		5,704			—			36,550
Other current assets	15		16,176		787			—			16,978
Total current assets	24		259,218		11,313			—			270,555
Property, plant and equipment, net	—		2,449,473		128,915			—			2,578,388
Deferred charges, net	2,581		15,724		772			—			19,077
Intercompany receivable	1,779,872		680,663		107,038			(2,567,573		)	—
Investment in subsidiaries	768,718		8,602		(4,283		)	(773,037		)	—
Other assets	1,744		6,239		2,272			—			10,255
Total assets	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	11,325	$	449		$	—		$	11,774
Accrued interest	14,763		—		—			—			14,763
Accrued payroll and benefits	—		8,104		492			—			8,596
Other accrued liabilities	—		8,463		1,547			—			10,010
Total current liabilities	14,763		27,892		2,488			—			45,143
Long-term debt, net of original issue discount of $31,093 and deferred financing costs of $10,197	1,083,710		—		—			—			1,083,710
Deferred tax liabilities, net	—		337,503		5,517			—			343,020
Intercompany payables	61,715		2,264,900		245,276			(2,571,891		)	—
Other liabilities	—		3,416		(10		)	—			3,406
Total liabilities	1,160,188		2,633,711		253,271			(2,571,891		)	1,475,279
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 36,467 shares issued and outstanding	365		—		—			—			365
Additional paid-in capital	754,394		37,978		4,319			(42,297		)	754,394
Retained earnings	637,992		748,080		(21,658		)	(726,422		)	637,992
Accumulated other comprehensive income	—		150		10,095			—			10,245
Total stockholders’ equity	1,392,751		786,208		(7,244		)	(768,719		)	1,402,996
Total liabilities and stockholders’ equity	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275

F - 32

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	10	$	252,651	$	7,140		$	—		$	259,801
Accounts receivable, net of allowance for doubtful accounts of $2,877	—		41,963		48,418			821			91,202
Other current assets	12		12,955		66			—			13,033
Total current assets	22		307,569		55,624			821			364,036
Property, plant and equipment, net	—		2,472,367		102,294			—			2,574,661
Deferred charges, net	3,198		56,021		(23,946		)	—			35,273
Intercompany receivable	1,751,046		186,054		59,413			(1,996,513		)	—
Investment in subsidiaries	783,709		8,602		(4,283		)	(788,028		)	—
Other assets	1,743		6,648		2,055			—			10,446
Total assets	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	34,214	$	1,521		$	7		$	35,742
Accrued interest	14,795		—		—			—			14,795
Accrued payroll and benefits	—		9,913		452			—			10,365
Other accrued liabilities	—		16,989		6,623			—			23,612
Total current liabilities	14,795		61,116		8,596			7			84,514
Long-term debt, net of original issue discount of $41,600 and deferred financing costs of $13,119	1,070,281		—		—			—			1,070,281
Deferred tax liabilities, net	—		381,619		—			—			381,619
Intercompany payables	4,403		1,801,829		193,786			(2,000,018		)	—
Other liabilities	—		1,839		—			—			1,839
Total liabilities	1,089,479		2,246,403		202,382			(2,000,011		)	1,538,253
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 35,985 shares issued and outstanding	360		—		—			—			360
Additional paid-in capital	748,043		37,976		4,319			(42,297		)	748,041
Retained earnings	701,836		752,763		(11,349		)	(741,412		)	701,838
Accumulated other comprehensive income (loss)	—		119		(4,195		)	—			(4,076		)
Total stockholders’ equity	1,450,239		790,858		(11,225		)	(783,709		)	1,446,163
Total liabilities and stockholders’ equity	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416

F - 33

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Condensed Consolidating Statement of Operations

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Revenues	$	—		$	213,563		$	8,707		$	2,029	$	224,299
Costs and expenses:
Operating expenses	—			114,783			14,904			1,971		131,658
Depreciation	—			88,443			4,628			—		93,071
Amortization	—			19,024			1,461			—		20,485
General and administrative expenses	184			39,479			3,637			58		43,358
	184			261,729			24,630			2,029		288,572
Gain on sale of assets	—			53			1			—		54
Operating loss	(184		)	(48,113		)	(15,922		)	—		(64,219		)
Other income (expense):
Interest income	—			984			506			—		1,490
Interest expense	(48,673		)	—			(2		)	—		(48,675		)
Equity in earnings (losses) of consolidated subsidiaries	(14,989		)	—			—			14,989		—
Other income (expense), net	—			(2,272		)	4,324			—		2,052
	(63,662		)	(1,288		)	4,828			14,989		(45,133		)
Income (loss) before income taxes	(63,846		)	(49,401		)	(11,094		)	14,989		(109,352		)
Income tax benefit	—			(44,721		)	(785		)	—		(45,506		)
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)
Other comprehensive income:
Foreign currency translation gain	—			31			14,290			—		14,321
Total comprehensive income (loss)	$	(63,846	)	$	(4,649	)	$	3,981		$	14,989	$	(49,525	)

F - 34

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Condensed Consolidating Statement of Operations

(In thousands)

	Year ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Revenues	$	—		$	426,419		$	50,952		$	(1,301	)	$	476,070
Costs and expenses:
Operating expenses	—			178,748			41,514			(1,002		)	219,260
Depreciation	—			81,522			1,044			—			82,566
Amortization	—			25,782			681			—			26,463
General and administrative expenses	189			44,398			3,861			(151		)	48,297
	189			330,450			47,100			(1,153		)	376,586
Gain on sale of assets	—			44,060			—			—			44,060
Operating income (loss)	(189		)	140,029			3,852			(148		)	143,544
Other income (expense):
Interest income	—			1,125			400			—			1,525
Interest expense	(39,460		)	—			(36		)	—			(39,496		)
Equity in earnings (losses) of consolidated subsidiaries	106,798			—			—			(106,798		)	—
Other income (expense), net	—			(4,053		)	5,238			(180		)	1,005
	67,338			(2,928		)	5,602			(106,978		)	(36,966		)
Income (loss) before income taxes	67,149			137,101			9,454			(107,126		)	106,578
Income tax expense	—			35,194			4,563			—			39,757
Net income (loss)	$	67,149		$	101,907		$	4,891		$	(107,126	)	$	66,821

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Net income (loss)	$	67,149	$	101,907		$	4,891		$	(107,126	)	$	66,821
Other comprehensive income:
Foreign currency translation loss	—		(81		)	(3,093		)	—			(3,174		)
Total comprehensive income (loss)	$	67,149	$	101,826		$	1,798		$	(107,126	)	$	63,647

F - 35

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Condensed Consolidating Statements of Cash Flows

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(199	)	$	55,677		$	(2,428	)	$	—	$	53,050
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(76,615		)	338			—		(76,277		)
Net proceeds from sale of assets	—			523			1			—		524
Vessel capital expenditures	—			(19,604		)	(1,085		)	—		(20,689		)
Non-vessel capital expenditures	—			(467		)	(102		)	—		(569		)
Net cash used in investing activities	—			(96,163		)	(848		)	—		(97,011		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(1,102		)	—			—			—		(1,102		)
Net cash proceeds from other shares issued	1,300			—			—			—		1,300
Net cash provided by financing activities	198			—			—			—		198
Effects of exchange rate changes on cash	—			31			958			—		989
Net decrease in cash and cash equivalents	(1		)	(40,455		)	(2,318		)	—		(42,774		)
Cash and cash equivalents at beginning of period	10			252,651			7,140			—		259,801
Cash and cash equivalents at end of period	$	9		$	212,196		$	4,822		$	—	$	217,027
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,152		$	—		$	—		$	—	$	50,152
Cash paid for income taxes	$	—		$	1,292		$	2,440		$	—	$	3,732

Condensed Consolidating Statements of Cash Flows

(In thousands)

	Year Ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(1,029	)	$	109,987		$	106,885		$	—	$	215,843
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(120,767		)	(69,303		)	—		(190,070		)
Net proceeds from sale of assets	—			152,000			—			—		152,000
Vessel capital expenditures	—			(55,724		)	(31,068		)	—		(86,792		)
Non-vessel capital expenditures	—			(16,211		)	(276		)	—		(16,487		)
Net cash used in investing activities	—			(40,702		)	(100,647		)	—		(141,349		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(2,089		)	—			—			—		(2,089		)
Net cash proceeds from other shares issued	3,112			—			—			—		3,112
Net cash provided by financing activities	1,023			—			—			—		1,023
Effects of exchange rate changes on cash	—			(81		)	(758		)	—		(839		)
Net increase (decrease) in cash and cash equivalents	(6		)	69,204			5,480			—		74,678
Cash and cash equivalents at beginning of period	16			183,447			1,660			—		185,123
Cash and cash equivalents at end of period	$	10		$	252,651		$	7,140		$	—	$	259,801
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,492		$	—		$	—		$	—	$	50,492
Cash paid for income taxes	$	—		$	582		$	4,226		$	—	$	4,808

F - 36

HORNBECK OFFSHORE SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

17. Supplemental Selected Quarterly Financial Data (Unaudited) (in thousands, except per share data):

The following table contains selected unaudited quarterly financial data from the consolidated statements of operations for each quarter of fiscal years 2016 and 2015. The operating results for any quarter are not necessarily indicative of results for any future period.

	Quarter Ended
	Mar 31			Jun 30			Sep 30			Dec 31
Fiscal Year 2016(1)(2)
Revenues	$	76,820		$	53,673		$	51,927		$	41,879
Operating loss	(780		)	(21,510		)	(14,445		)	(27,484		)
Net loss	(7,514		)	(20,586		)	(16,503		)	(19,243		)
Earnings (loss) per common share:
Basic loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Diluted loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Fiscal Year 2015(1)(2)
Revenues	$	134,624		$	136,446		$	116,281		$	88,719
Operating income(3)	66,898			39,355			32,809			4,482
Net income (loss)	35,853			19,215			14,424			(2,671		)
Earnings (loss) per common share:
Basic earnings (loss) per common share	$	1.01		$	0.54		$	0.40		$	(0.07	)
Diluted earnings (loss) per common share	$	0.99		$	0.53		$	0.40		$	(0.07	)

⁽¹⁾  The sum of the four quarters may not equal annual results due to rounding.

⁽²⁾  Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

⁽³⁾  During the first quarter of 2015, the Company closed on the sale of three 250EDF class OSVs that were previously chartered to the U.S Navy for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). During the third quarter of 2015, the Company closed on the sale of one 250EDF class OSV that was previously chartered to the U.S Navy for cash consideration of $38.0 million. The sale resulted in a pre-tax gain of approximately $11.0 million ($6.7 million after-tax or $0.19 per diluted share). See Note 5 for further discussion.

F - 37

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Covington, the State of Louisiana, on February 24, 2017.

HORNBECK OFFSHORE SERVICES, INC.
By:	/s/    TODD M. HORNBECK
	Todd M. Hornbeck President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/S/    TODD M. HORNBECK	Chairman of the Board, President, and Chief Executive Officer (Principal Executive Officer)	February 24, 2017
(Todd M. Hornbeck)
/S/    JAMES O. HARP, JR.	Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)	February 24, 2017
(James O. Harp, Jr.)
/S/    LARRY D. HORNBECK	Director	February 24, 2017
(Larry D. Hornbeck)
/S/    BRUCE W. HUNT	Director	February 24, 2017
(Bruce W. Hunt)
/S/    STEVEN W. KRABLIN	Director	February 24, 2017
(Steven W. Krablin)
/S/    PATRICIA B. MELCHER	Director	February 24, 2017
(Patricia B. Melcher)
/S/    KEVIN O. MEYERS	Director	February 24, 2017
(Kevin O. Meyers)
/S/    JOHN T. RYND	Director	February 24, 2017
(John T. Rynd)
/S/    BERNIE W. STEWART	Director	February 24, 2017
(Bernie W. Stewart)
/S/    NICHOLAS L. SWYKA JR.	Director	February 24, 2017
(Nicholas L. Swyka, Jr.)

S - 1

Exhibit Index

Exhibit Number		Description of Exhibit
3.1	—	Second Restated Certificate of Incorporation of the Company, as amended (incorporated by reference to Exhibit 3.1 to the Company’s Form 10-Q for the quarter ended March 31, 2005).
3.2	—	Amended and Restated Certificate of Designation of Series A Junior Participating Preferred Stock filed with the Secretary of State of the State of Delaware on July 2, 2013 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed July 3, 2013).
3.3	—	Fourth Restated Bylaws of the Company adopted June 30, 2004 (incorporated by reference to Exhibit 3.3 to the Company’s Form 10-Q for the quarter ended June 30, 2004).
3.4	—	Amendment No. 1 to Fourth Restated Bylaws of the Company adopted June 21, 2012 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed June 27, 2012).
4.1	—	Specimen stock certificates for the Company’s common stock, $0.01 par value (for U.S. citizens and non-U.S. citizens) (incorporated by reference to Exhibit 4.4 to the Company’s Form 8-A/A filed July 3, 2013, Registration No. 001-32108).
4.2	—	Indenture, dated March 16, 2012 among Hornbeck Offshore Services, Inc., as issuer, the guarantors party thereto and Wells Fargo Bank, National Association, as trustee (including form of 5.875% Senior Notes due 2020) (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed March 21, 2012).
4.3	—	Indenture dated as of August 13, 2012 by and among Hornbeck Offshore Services, Inc., the guarantors named therein, and Wells Fargo Bank, National Association, as Trustee (including form of 1.500% Convertible Senior Notes due 2019) (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.4	—	Confirmation of Base Call Option Transaction dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and Barclays Bank PLC (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.5	—	Confirmation of Base Call Option Transaction dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and JPMorgan Chase Bank, National Association, London Branch (incorporated by reference to Exhibit 4.3 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.6	—	Confirmation of Base Call Option Transaction dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and Wells Fargo Bank, National Association (incorporated by reference to Exhibit 4.4 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.7	—	Confirmation of Additional Base Call Option Transaction dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and Barclays Bank PLC (incorporated by reference to Exhibit 4.5 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.8	—	Confirmation of Additional Base Call Option Transaction dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and JPMorgan Chase Bank, National Association, London Branch (incorporated by reference to Exhibit 4.6 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.9	—	Confirmation of Additional Base Call Option Transaction dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and Wells Fargo Bank, National Association (incorporated by reference to Exhibit 4.7 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.10	—	Confirmation of Base Warrant dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and Barclays Bank PLC (incorporated by reference to Exhibit 4.8 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.11	—	Confirmation of Base Warrant dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and JPMorgan Chase Bank, National Association, London Branch (incorporated by reference to Exhibit 4.9 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.12	—	Confirmation of Base Warrant dated as of August 7, 2012 by and between Hornbeck Offshore Services, Inc. and Wells Fargo Bank, National Association (incorporated by reference to Exhibit 4.10 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.13	—	Confirmation of Additional Warrants dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and Barclays Bank PLC (incorporated by reference to Exhibit 4.11 to the Company’s Current Report on Form 8-K filed on August 13, 2012).

E - 1

Exhibit Number		Description of Exhibit
4.14	—	Confirmation of Additional Warrants dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and JPMorgan Chase Bank, National Association, London Branch (incorporated by reference to Exhibit 4.12 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.15	—	Confirmation of Additional Warrants dated as of August 8, 2012 by and between Hornbeck Offshore Services, Inc. and Wells Fargo Bank, National Association (incorporated by reference to Exhibit 4.13 to the Company’s Current Report on Form 8-K filed on August 13, 2012).
4.16	—	Indenture governing the 5.000% Notes, dated March 28, 2013 among Hornbeck Offshore Services, Inc., as issuer, the guarantors party thereto and Wells Fargo Bank, National Association, as trustee (including form of 5.000% Senior Notes due 2021) (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on March 28, 2013).
4.17	—	Rights Agreement dated as of July 1, 2013 between Hornbeck Offshore Services, Inc. and Computershare Inc., as Rights Agent, which includes as Exhibit A the Amended and Restated Certificate of Designation of Series A Preferred Stock, as Exhibit B the form of Right Certificate and as Exhibit C the form of Summary of Rights to Purchase Shares (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed July 3, 2013).
4.18	—	First Supplemental Indenture, dated October 6, 2015 among Hornbeck Offshore Services, Inc., the guarantors party thereto and Wells Fargo Bank, National Association, as trustee (to the indenture governing the 1.5% Convertible Senior Notes due 2019) (incorporated by reference to Exhibit 4.18 to the Company’s Form 10-Q for the quarter ended September 30, 2015).
4.19	—	First Supplemental Indenture, dated October 6, 2015 among Hornbeck Offshore Services, Inc., the guarantors party thereto and Wells Fargo Bank, National Association, as trustee (to the indenture governing the 5.875% Senior Notes due 2020) (incorporated by reference to Exhibit 4.19 to the Company’s Form 10-Q for the quarter ended September 30, 2015).
4.20	—	First Supplemental Indenture, dated October 6, 2015 among Hornbeck Offshore Services, Inc., the guarantors party thereto and Wells Fargo Bank, National Association, as trustee (to the indenture governing the 5.000% Senior Notes due 2021) (incorporated by reference to Exhibit 4.20 to the Company’s Form 10-Q for the quarter ended September 30, 2015).
10.1	—	Facilities Use Agreement effective January 1, 2006, and incorporated Indemnification Agreement and amendments thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed February 21, 2006).
10.2†	—	Director & Advisory Director Compensation Policy, effective January 1, 2012 (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-K for the period ended December 31, 2011).
10.3†	—	Hornbeck Offshore Services, Inc. Deferred Compensation Plan dated as of July 10, 2007 (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q for the period ended June 30, 2007).
10.4†	—	Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan, dated effective May 2, 2006 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed May 4, 2006).
10.5†	—	Amendment to the Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan, dated effective May 12, 2008 (incorporated by reference to Exhibit 10.4 to the Company’s Form 10-Q for the period ended March 31, 2008).
10.6†	—	Second Amendment to the Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan, dated effective June 24, 2010 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed June 30, 2010).
10.7†	—	Amended and Restated Senior Employment Agreement dated May 7, 2007 by and between Todd M. Hornbeck and the Company (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the period ended March 31, 2007).
10.8†	—	Amended and Restated Employment Agreement dated May 7, 2007 by and between Carl G. Annessa and the Company (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q for the period ended March 31, 2007).
10.9†	—	Amended and Restated Employment Agreement dated May 7, 2007 by and between James O. Harp, Jr. and the Company (incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q for the period ended March 31, 2007).
10.10†	—	Amendment to Amended and Restated Senior Employment Agreement dated effective May 12, 2008 by and between Todd M. Hornbeck and the Company (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the period ended March 31, 2008).

E - 2

Exhibit Number		Description of Exhibit
10.11†	—	Amendment to Amended and Restated Employment Agreement dated effective May 12, 2008 by and between Carl G. Annessa and the Company (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q for the period ended March 31, 2008).
10.12†	—	Amendment to Amended and Restated Employment Agreement dated effective May 12, 2008 by and between James O. Harp, Jr. and the Company (incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q for the period ended March 31, 2008).
10.13†	—	Second Amendment to Amended and Restated Senior Employment Agreement dated effective December 31, 2009 by and between Todd M. Hornbeck and the Company (incorporated by reference to Exhibit 10.12 to the Company’s Form 10-K for the period ended December 31, 2009).
10.14†	—	Second Amendment to Amended and Restated Employment Agreement dated effective December 31, 2009 by and between Carl G. Annessa and the Company (incorporated by reference to Exhibit 10.13 to the Company’s Form 10-K for the period ended December 31, 2009).
10.15†	—	Second Amendment to Amended and Restated Employment Agreement dated effective December 31, 2009 by and between James O. Harp, Jr. and the Company (incorporated by reference to Exhibit 10.14 to the Company’s Form 10-K for the period ended December 31, 2009).
10.16†	—	Employment Agreement dated effective January 1, 2011 by and between Samuel A. Giberga and the Company (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the period ended June 30, 2011).
10.17†	—	Change in Control Agreement dated effective August 5, 2008 by and between Samuel A. Giberga and the Company (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended June 30, 2008).
10.18†	—	Employment Agreement dated effective January 1, 2013 by and between John S. Cook and the Company (incorporated by reference to Exhibit 10.18 to the Company's Form 10-K for the period ended December 31, 2012).
10.19†	—	Change in Control Agreement dated effective August 5, 2008 by and between John S. Cook and the Company (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q for the quarter ended June 30, 2008).
10.20†	—	Amendment to Change in Control Agreement dated effective December 31, 2009 by and between John S. Cook and the Company (incorporated by reference to Exhibit 10.19 to the Company’s Form 10-K for the period ended December 31, 2009).
10.21†	—	Amendment to Change in Control Agreement dated effective December 31, 2009 by and between Samuel A. Giberga and the Company (incorporated by reference to Exhibit 10.18 to the Company’s Form 10-K for the period ended December 31, 2009).
10.22	—	Form of Amended and Restated Indemnification Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended June 30, 2009).
10.23†	—	Form of Executive Non-Qualified Stock Option Agreement (incorporated by reference to Exhibit 10.16 to the Company’s Form 10-K for the period ended December 31, 2004).
10.24†	—	Form of Director Non-Qualified Stock Option Agreement (incorporated by reference to Exhibit 10.17 to the Company’s Form 10-K for the period ended December 31, 2004).
10.25†	—	Form of Employee Non-Qualified Stock Option Agreement (incorporated by reference to Exhibit 10.18 to the Company’s Form 10-K for the period ended December 31, 2004).
10.26†	—	Form of Restricted Stock Unit Agreement for Executive Officers (Time Vesting) (incorporated by reference to Exhibit 10.7 to the Company’s Form 10-Q for the quarter ended March 31, 2008).
10.27†	—	Form of Restricted Stock Unit Agreement for Non-Employee Directors (Time Vesting) (incorporated by reference to Exhibit 10.8 to the Company’s Form 10-Q for the quarter ended March 31, 2008).
10.28†	—	Form of Restricted Stock Unit Agreement for Executive Officers (Performance Based) (incorporated by reference to Exhibit 10.9 to the Company’s Form 10-Q for the quarter ended March 31, 2008).
10.29†	—	Form of Restricted Stock Unit Agreement for Executive Officers (Performance Based) (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended March 31, 2009).
10.30†	—	Form of Restricted Stock Unit Agreement for Executive Officers (Time Vesting) (incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q for the quarter ended March 31, 2009).

E - 3

Exhibit Number		Description of Exhibit
10.31†	—	Form of Restricted Stock Unit Agreement for Executive Officers (Performance Based) (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended March 31, 2010).
10.32	—	Vessel Construction Agreement dated November 14, 2011 by and between Hornbeck Offshore Services, Inc. and VT Halter Marine, Inc. (incorporated by reference to Exhibit 10.41 to the Company’s Form 10-K for the period ended December 31, 2011). (portions of this exhibit have been omitted pursuant to a request for confidential treatment filed with the Securities and Exchange Commission).
10.33	—	Consulting Agreement dated February 14, 2012 by and between Hornbeck Offshore Services, Inc. and Larry D. Hornbeck (incorporated by reference to Exhibit 10.43 to the Company’s Form 10-K for the period ended December 31, 2011).
10.34	—	Amendment No. 3 to the Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed June 24, 2013).
10.35	—	Form of Amended Appendix A to Employment Agreements for Executive Officers (incorporated by reference to Exhibit 10.1 to the Company's Form 10-Q for the quarter ended March 31, 2014).
10.36	—	Second Amended and Restated Credit Agreement dated as of February 6, 2015 by and among the Company and one of its subsidiaries, Hornbeck Offshore Services, LLC, each of the lenders and guarantors signatory thereto, and Wells Fargo Bank, National Association, as administrative agent for the lenders (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on February 12, 2015).
10.37	—	Second Amended and Restated Guaranty and Collateral Agreement dated as of February 6, 2015 by and among the Company, one of its subsidiaries, Hornbeck Offshore Services, LLC, each of the guarantors signatory thereto, and Wells Fargo Bank, National Association, as administrative agent for the lenders (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on February 12, 2015).
10.38	—	Amended and Restated Indemnification Agreement effective as of May 7, 2015 by and among the Company, Hornbeck Family Ranch, LP, Larry D. Hornbeck and Joan M. Hornbeck (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended March 31, 2015).
10.39†	—	Fourth Amendment to the Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan, effective June 18, 2015 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed June 24, 2015).
10.40†	—	First Amendment to the Hornbeck Offshore Services, Inc. 2005 Employee Stock Purchase Plan, effective June 18, 2015 (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed June 24, 2015).
10.41		Form of Amended Appendix A to Employment Agreements for Executive Officers (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q for the quarter ended March 31, 2016).
10.42		First Amendment to Second Amended and Restated Credit Agreement dated as of July 29, 2016 by and among the Company and one of its subsidiaries, Hornbeck Offshore Services, LLC, each of the lenders and guarantors signatory thereto, and Wells Fargo Bank, National Association, as administrative agent for the lenders (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on August 4, 2016).
*21	—	Subsidiaries of the Company
*23.1	—	Consent of Ernst & Young LLP
*31.1	—	Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*31.2	—	Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*32.1	—	Certification of the Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*32.2	—	Certification of the Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*101	—	Interactive Data File
*	Filed herewith.
†	Compensatory plan or arrangement under which executive officers or directors of the Company may participate.

E - 4

EX-21.1

EXHIBIT 21

Subsidiaries of Hornbeck Offshore Services, Inc.

Subsidiary Name	State or Country of Incorporation
Hornbeck Offshore Services, LLC	Delaware
Hornbeck Offshore Operators, LLC	Delaware
HOS Port, LLC	Delaware

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

Registration Statement (Form S-8 No. 333-119109), Registration Statement (Form S-8 No. 333-168908) and Registration Statement (Form S-8 No. 333-205198) pertaining to the Second Amended and Restated Hornbeck Offshore Services, Inc. Incentive Compensation Plan;

Registration Statement (Form S-8 No. 333-124698) and Registration Statement (Form S-8 No. 333-205201) pertaining to the Hornbeck Offshore Services, Inc. 2005 Employee Stock Purchase Plan; and

Registration Statement (Form S-4 No. 333-183777) of Hornbeck Offshore Services, Inc.

of our reports dated February 24, 2017, with respect to the consolidated financial statements of Hornbeck Offshore Services, Inc. and subsidiaries, and the effectiveness of internal control over financial reporting of Hornbeck Offshore Services, Inc., included in this Annual Report (Form 10-K) of Hornbeck Offshore Services, Inc. for the year ended December 31, 2016.

	/s/ Ernst & Young LLP
New Orleans, Louisiana
February 24, 2017

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Todd M. Hornbeck, certify that:

1. I have reviewed this Annual Report on Form 10-K of Hornbeck Offshore Services, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 24, 2017	/s/ Todd M. Hornbeck
	Todd M. Hornbeck
	Chief Executive Officer (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, James O. Harp, Jr., certify that:

1. I have reviewed this Annual Report on Form 10-K of Hornbeck Offshore Services, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 24, 2017	/s/ James O. Harp, Jr
	James O. Harp, Jr.
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Hornbeck Offshore Services, Inc., a Delaware corporation (the “Company”), on Form 10-K for the year ended December 31, 2016, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Todd M. Hornbeck, Chairman, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: February 24, 2017

/s/ Todd M. Hornbeck

Todd M. Hornbeck

Chairman, President and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Hornbeck Offshore Services, Inc., a Delaware corporation (the “Company”), on Form 10-K for the year ended December 31, 2016, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James O. Harp, Jr., Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: February 24, 2017

/s/ James O. Harp, Jr.

James O. Harp, Jr.

Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Jan. 31, 2017	Jun. 30, 2016
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Trading Symbol	HOS
Entity Registrant Name	HORNBECK OFFSHORE SERVICES INC /LA
Entity Central Index Key	0001131227
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		36,466,840
Entity Public Float			$ 286,306,654

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 217,027	$ 259,801	$ 185,123	$ 439,291
Accounts receivable, net of allowance for doubtful accounts of $2,120 and $2,877, respectively	36,550	91,202
Other current assets	16,978	13,033
Total current assets	270,555	364,036
Property, plant and equipment, net	2,578,388	2,574,661
Deferred charges, net	19,077	35,273
Other assets	10,255	10,446
Total assets	2,878,275	2,984,416
Current liabilities:
Accounts payable	11,774	35,742
Accrued interest	14,763	14,795
Accrued payroll and benefits	8,596	10,365
Other accrued liabilities	10,010	23,612
Total current liabilities	45,143	84,514
Long-term debt, net of original issue discount of $31,093 and $41,600 and deferred financing costs of $10,197 and $13,119, respectively	1,083,710	1,070,281
Deferred tax liabilities, net	343,020	381,619
Other liabilities	3,406	1,839
Total liabilities	1,475,279	1,538,253
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock: $0.01 par value; 100,000 shares authorized; 36,467 and 35,985 shares issued and outstanding, respectively	365	360
Additional paid-in capital	754,394	748,041
Retained earnings	637,992	701,838
Accumulated other comprehensive income (loss)	10,245	(4,076)
Total stockholders’ equity	1,402,996	1,446,163	$ 1,370,765	$ 1,295,428
Total liabilities and stockholders’ equity	$ 2,878,275	$ 2,984,416

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 2,120	$ 2,877
Current portion of long-term debt, original issue discount	0	0
Long-term debt, original issue discount	31,093	41,600
Debt Issuance Costs, Net	$ 10,197	$ 13,119
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common stock, shares issued	36,467,000	35,985,000
Common stock, shares outstanding	36,467,000	35,985,000

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Consolidated Statements Of Operations - USD ($) shares in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Vessel revenues		$ 190,436,000	$ 446,382,000	$ 621,977,000
Non-vessel revenues		33,863,000	29,688,000	12,816,000
Revenues		224,299,000	476,070,000	634,793,000
Costs and expenses:
Operating expenses		131,658,000	219,260,000	296,500,000
Depreciation		93,071,000	82,566,000	71,301,000
Amortization		20,485,000	26,463,000	44,149,000
General and administrative expenses		43,358,000	48,297,000	54,245,000
Costs and Expenses, Total		288,572,000	376,586,000	466,195,000
Gain on sale of assets		54,000	44,060,000	822,000
Operating income (loss)		(64,219,000)	143,544,000	169,420,000
Other income (expense):
Interest income		1,490,000	1,525,000	1,086,000
Interest expense		(48,675,000)	(39,496,000)	(30,733,000)
Other income		2,052,000	1,005,000	501,000
Nonoperating Income (Expense)		(45,133,000)	(36,966,000)	(29,146,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		(109,352,000)	106,578,000	140,274,000
Income tax expense (benefit)		(45,506,000)	39,757,000	52,367,000
Income (loss) from continuing operations		(63,846,000)	66,821,000	87,907,000	[1]
Income from discontinued operations, net of tax	[2]	0	0	618,000
Net income (loss)		$ (63,846,000)	$ 66,821,000	$ 88,525,000
Basic earnings (loss) per common share from continuing operations		$ (1.76)	$ 1.87	$ 2.43
Basic earnings per common share from discontinued operations		0.00	0.00	0.02
Basic earnings (loss) per common share		(1.76)	1.87	2.45
Diluted earnings (loss) per common share from continuing operations		(1.76)	1.84	2.40
Diluted earnings per common share from discontinued operations		0.00	0.00	0.01
Diluted earnings (loss) per common share		$ (1.76)	$ 1.84	$ 2.41
Weighted average basic shares outstanding		36,248	35,755	36,172
Weighted average diluted shares outstanding		36,248	36,302	36,692

[1] On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

[2] Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016	[1],[2]	Sep. 30, 2016	[1],[2]	Jun. 30, 2016	[1],[2]	Mar. 31, 2016	[1],[2]	Dec. 31, 2015	[2]	Sep. 30, 2015	[2]	Jun. 30, 2015	[2]	Mar. 31, 2015	[2]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss)	$ (19,243)		$ (16,503)		$ (20,586)		$ (7,514)		$ (2,671)		$ 14,424		$ 19,215		$ 35,853		$ (63,846)	$ 66,821	$ 88,525
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax																	14,321	(3,174)	(107)
Other comprehensive income:
Total comprehensive income (loss)																	$ (49,525)	$ 63,647	$ 88,418

[1] Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

[2] The sum of the four quarters may not equal annual results due to rounding.

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Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance (in shares) at Dec. 31, 2013		36,095,000
Beginning Balance at Dec. 31, 2013	$ 1,295,428	$ 361	$ 724,379	$ 571,483	$ (795)
Excess tax benefit (shortfall) from sharebased payments	292		292
Shares issued under employee benefit programs, Shares		353,000
Shares issued under employee benefit programs	$ 2,186	$ 4	2,182
Stock Repurchased and Retired During Period, Shares	(891,396)	(891,000)
Stock Repurchased and Retired During Period, Value	$ (25,000)	$ (9)		(24,991)
Stock-based compensation expense	9,441		9,441
Net income (Loss)	88,525			88,525
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(107)				(107)
Ending Balance (in shares) at Dec. 31, 2014		35,557,000
Ending Balance at Dec. 31, 2014	1,370,765	$ 356	736,294	635,017	(902)
Excess tax benefit (shortfall) from sharebased payments	(572)		(572)
Shares issued under employee benefit programs, Shares		428,000
Shares issued under employee benefit programs	$ 1,859	$ 4	1,855
Stock Repurchased and Retired During Period, Shares	0
Stock-based compensation expense	$ 10,464		10,464
Net income (Loss)	66,821			66,821
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(3,174)				(3,174)
Ending Balance (in shares) at Dec. 31, 2015		35,985,000
Ending Balance at Dec. 31, 2015	1,446,163	$ 360	748,041	701,838	(4,076)
Excess tax benefit (shortfall) from sharebased payments	(1,863)		(1,863)
Shares issued under employee benefit programs, Shares		482,000
Shares issued under employee benefit programs	$ 849	$ 5	844
Stock Repurchased and Retired During Period, Shares	0
Stock-based compensation expense	$ 7,372		7,372
Net income (Loss)	(63,846)			(63,846)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	14,321				14,321
Ending Balance (in shares) at Dec. 31, 2016		36,467,000
Ending Balance at Dec. 31, 2016	$ 1,402,996	$ 365	$ 754,394	$ 637,992	$ 10,245

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Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from continuing operations	$ (63,846,000)	$ 66,821,000	$ 87,907,000	[1]
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	93,071,000	82,566,000	71,301,000
Amortization	20,485,000	26,463,000	44,149,000
Stock-based compensation expense	9,983,000	10,293,000	10,324,000
Addition to (reduction of) provision for bad debts	(757,000)	(816,000)	282,000
Deferred tax expense (benefit)	(43,051,000)	34,086,000	50,440,000
Amortization of deferred financing costs	11,371,000	9,675,000	8,154,000
Gain on sale of assets	(54,000)	(44,060,000)	(822,000)
Changes in operating assets and liabilities:
Accounts receivable	58,322,000	39,743,000	(38,500,000)
Other current and long-term assets	2,272,000	(8,472,000)	8,393,000
Deferred drydocking charges	(3,978,000)	(13,267,000)	(43,609,000)
Accounts payable	(10,901,000)	(10,486,000)	(4,146,000)
Accrued liabilities and other liabilities	(15,292,000)	6,448,000	(13,981,000)
Accrued interest	(31,000)	(95,000)	0
Net cash provided by operating activities	53,050,000	215,843,000	163,106,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program 5	(76,277,000)	(190,070,000)	(343,989,000)
Net proceeds from sale of assets	524,000	152,000,000	7,178,000
Vessel capital expenditures	(20,689,000)	(86,792,000)	(55,089,000)
Non-vessel capital expenditures	(569,000)	(16,487,000)	(9,615,000)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(97,011,000)	(141,349,000)	(401,515,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based payments	0	0	292,000
Repurchase of common stock	0	0	(25,000,000)
Deferred financing costs	(1,102,000)	(2,089,000)	0
Net cash proceeds from other shares issued	1,300,000	3,112,000	5,044,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	198,000	1,023,000	(19,664,000)
Net Cash Provided by (Used in) Discontinued Operations
Net cash provided by operating activities	0	0	2,374,000
Net cash provided by investing activities	0	0	1,638,000
Net cash provided by discontinued operations	0	0	4,012,000
Effects of exchange rate changes on cash	989,000	(839,000)	(107,000)
Net increase (decrease) in cash and cash equivalents	(42,774,000)	74,678,000	(254,168,000)
Cash and cash equivalents at beginning of period	259,801,000	185,123,000	439,291,000
Cash and cash equivalents at end of period	217,027,000	259,801,000	185,123,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	50,152,000	50,492,000	50,548,000
Cash paid for income taxes	$ 3,732,000	$ 4,808,000	$ 5,679,000

[1] On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

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Organization

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Nature of Operations

Organization

Nature of Operations

Hornbeck Offshore Services, Inc., or the Company, was incorporated in the state of Delaware in 1997. The Company, through its subsidiaries, operates offshore supply vessels, or OSVs, multi-purpose support vessels, or MPSVs, and a shore-base facility to provide logistics support and specialty services to the offshore oil and gas exploration and production industry, primarily in the U.S. Gulf of Mexico, or GoM, Latin America and select international markets, as well as specialty services for the U.S. military. All significant intercompany accounts and transactions have been eliminated.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2016

Significant Accounting Policies

Summary of Significant Accounting Policies

Revenue Recognition

The Company charters its OSVs and MPSVs to clients under time charters based on a daily rate of hire and recognizes revenue as earned on a daily basis during the contract period of the specific vessel.

Deferred revenue represents payments received from customers or billings submitted to customers in advance of providing vessel access through time charters or other contracted arrangements.

Cash and Cash Equivalents

Cash and cash equivalents consist of all highly liquid investments in money market funds, deposits and investments available for current use with an initial maturity of three months or less.

Accounts Receivable

Accounts receivable consists of trade receivables, net of reserves and amounts to be rebilled to customers.

Property, Plant and Equipment

Property, plant and equipment is recorded at cost. Depreciation and amortization of equipment and leasehold improvements are computed using the straight-line method based on the estimated useful lives of the related assets. Major modifications and improvements, which extend the useful life of the vessel, are capitalized and amortized over the remaining useful life of the vessel. Gains and losses from retirements or other dispositions are recognized as incurred. Salvage values for new generation marine equipment are estimated to be 25% of the originally recorded cost.

The estimated useful lives by classification are as follows:

Offshore supply vessels	25 years
Multi-purpose support vessels	25 years
Non-vessel related property, plant and equipment	3-28 years

See “Considerations Regarding Impairment of Long-Lived Assets” below for more information.

Deferred Charges

The Company’s vessels are required by regulation to be recertified after certain periods of time. The Company defers the drydocking expenditures incurred due to regulatory marine inspections and amortizes the costs on a straight-line basis over the period to be benefited from such expenditures (generally 30 months). Financing charges are amortized over the term of the related debt.

Deferred charges also include prepaid lease expenses related to the Company’s shore-base port facility. Such prepaid lease expenses are being amortized on a straight-line basis over the effective remaining term of the lease.

Mobilization Costs

The Company incurs mobilization costs to transit its vessels to and from certain regions and/or for long-term contracts. These costs, which are typically expensed as incurred, include, but are not limited to, fuel, crew wages, vessel modification and pre-positioning expenses, materials and supplies and importation taxes.

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using currently enacted tax rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The provision for income taxes includes provisions for federal, state and foreign income taxes. Interest and penalties relating to uncertain tax positions are recorded as general and administrative expenses. In addition, the Company provides a valuation allowance for deferred tax assets if it is more likely than not that such items will either expire before the Company is able to realize the benefit or the future deductibility is uncertain. As a result of the sale of the Downstream segment during 2013, the Company believed that certain state operating loss carryforwards would not be realizable and thus recorded a valuation allowance of $0.9 million for the year ended December 31, 2013. During 2014, the Company recorded an additional $0.1 million related to these state operating losses. During 2015, the total valuation allowance of $1.0 million on these state operating losses was reversed since the losses were written off upon ceasing to do business in those particular jurisdictions. As of December 31, 2016, the Company believed that it is more likely than not that foreign tax credits expiring in 2019 will not be fully utilized. In the fourth quarter of 2016, the Company elected to establish a valuation allowance of $2.3 million for the portion of such credits that it has concluded may not be utilized by December 31, 2019.

Use of Estimates

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Legal Liabilities

In the ordinary course of business, the Company may become party to lawsuits, administrative proceedings, or governmental investigations. These matters may involve large or unspecified damages or penalties that may be sought from the Company and may require years to resolve. The Company records a liability related to a loss contingency to such legal matters in accrued liabilities if the Company determines the loss to be both probable and estimable. The liability is recorded for an amount that is management’s best estimate of the loss, or when a best estimate cannot be made, the minimum loss amount of a range of possible outcomes. Significant judgment is required in estimating such liabilities, the results of which can vary significantly from the actual outcomes of lawsuits, administrative proceedings or governmental investigations.

Concentration of Credit Risk

Customers are primarily major and independent, domestic and international, oil and oil service companies, as well as national oil companies and the U.S. military. The Company’s customers are granted credit on a short-term basis and related credit risks are considered minimal. The Company usually does not require collateral. The Company provides an estimate for uncollectible accounts based primarily on management’s judgment using the relative age of customer balances, historical losses, current economic conditions and individual evaluations of each customer to make adjustments to the allowance for doubtful accounts. As of December 31, 2016, one customer represented 14% of the Company's net

accounts receivable balance.

The following table represents the allowance for doubtful accounts (in thousands):

	December 31,
	2016			2015			2014
Balance, beginning of year	$	2,877		$	3,693		$	3,411
Changes to provision	(757		)	(816		)	282
Balance, end of year	$	2,120		$	2,877		$	3,693

Foreign Currency Transaction Gains and Losses

Foreign currency transaction gains and losses are recorded in the period incurred except for advances to and investments in foreign subsidiaries.  Foreign currency gains and losses related to advances to or investments in foreign operations are accounted for as a foreign currency translation adjustment and recorded as other comprehensive income. Foreign currency transaction adjustments for fiscal years 2016, 2015 and 2014 were not material to the financial statements.  The balance in accumulated other comprehensive income as of December 31, 2016 relates primarily to the Company’s long term investments in its foreign subsidiaries.

Considerations Regarding Impairment of Long-Lived Assets

In accordance with ASC360, the Company periodically reviews long-lived asset valuations when events or changes in circumstances indicate that an asset's carrying value might not be recoverable. If indicators of impairment exist, the Company assesses the recoverability of its long-lived assets by comparing the projected future undiscounted cash flows associated with the related long-lived asset group over their remaining estimated useful lives. If the sum of the estimated undiscounted cash flows is less than the carrying amounts of the asset group, the assets would be written down to their estimated fair values based on the expected discounted future cash flows or appraised values attributable to the assets. The future cash flows are subjective and are based on the Company's current assumptions regarding future dayrates, utilization, operating expense, G&A expense and recertification costs that could differ from actual results.

As of June 30, 2016, the Company determined that it observed indicators of impairment related to its vessels. This resulted from the rapid deterioration of its second quarter 2016 operating results, as well as the uncertainty regarding future market conditions and the related impact on the Company's projected operating results. For the purposes of calculating the undiscounted cash flows, the Company groups its vessels into two groups, OSVs and MPSVs, and used a probability-weighted undiscounted cash flow projection to test for recoverability. After reviewing the results of this calculation, the Company determined that each of its asset groups has sufficient projected undiscounted cash flows to recover the remaining book value of the Company's long-lived assets within such group. During the second half of 2016, the Company reviewed the assumptions used in preparing the undiscounted cash flow projections and it concluded that such assumptions remain consistent with current market conditions. In addition, the Company has not observed any additional indicators of impairment related to its vessels during the second half of 2016 and the assumptions used to determine undiscounted cash flows remain appropriate. No triggering events occurred in 2015 or 2014 and the Company did not record any impairment losses related to its long-lived assets during those periods. The Company will continue to closely monitor market conditions and potential impairment indicators as long as this market downturn persists.

Recent Accounting Pronouncements

The following table provides a brief description of recent accounting pronouncements that could have a material effect on our financial statements:

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have been adopted
ASU No. 2014-15, "Presentation of Financial Statements - Going Concern"	The standard requires management to evaluate whether there are conditions and events that raise substantial doubt about an entity's ability to continue as a going concern. Early adoption is permitted.	December 31, 2016	The implementation of this new guidance did not have a material impact on the consolidated financial statements.

Standards that have not been adopted
Accounting Standards Update (ASU) No. 2017-04, "Simplifying the Accounting for Goodwill Impairment"	The standard removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 requires prospective application. Early adoption is permitted for any impairment tests performed after January 1, 2017.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on the consolidated financial statements.
ASU No. 2017-01, "Business Combinations" (Topic 805): Clarifying the Definition of a Business	This standard provides guidance to assist entities with evaluating when a set of transferred assets and activities is a business. ASU 2017-01 requires prospective application.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-16, "Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory"	The standard requires the recognition of the tax effects of an intra-entity asset transfers in the period in which the transfer takes place. The new guidance does not apply to intra-entity transfers of inventory. ASU No. 2016-16 requires a modified retrospective approach. Early adoption is permitted.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments"	The standard clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. The new guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. ASU No. 2016-15 requires retrospective application. Early adoption is permitted.	January 1, 2018	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have not been adopted
ASU No. 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments"	This standard requires measurement and recognition of expected credit losses for financial assets held. ASU No. 2016-13 requires modified retrospective application. Early adoption is permitted.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.
ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting"	This standard simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeitures and classification of related amounts within the statement of cash flows. Early adoption is permitted.	January 1, 2017	This standard requires excess tax benefits or deficiencies, relating to the vesting of restricted stock unit awards or the exercise of stock options, to be reflected as a component of the tax rate whereas they were previously recognized as equity. This may cause volatility to its effective tax rate as outstanding stock options are exercised or restricted stock awards vest. Additionally, our Consolidated Statements of Cash Flows will include excess tax benefits as an operating activity.
ASU No. 2016-02, "Leases" (Topic 842)	This standard requires lessees to recognize a lease liability and a right-of-use asset for all leases (with the exception of short-term leases) at the commencement date. ASU 2016-02 requires a modified retrospective application. Early adoption is permitted.	January 1, 2019	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2014-09, "Revenue from Contracts with Customers" (Topic 606)	This standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 requires retrospective application.	January 1, 2018	The Company has performed an initial evaluation of this standard and its impact on the financial statements. This included tasks such as identifying contracts, identifying performance obligations and reviewing the applicable revenue streams. In this review, nothing has been identified that would require a change in the current accounting for revenue. The Company will continue to review these new requirements prior to implementation which is expected under the modified retrospective method.

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Earnings (Loss) Per Share

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Earnings (Loss) Per Share

Basic earnings (loss) per common share was calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per common share was calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the year plus the effect of dilutive stock options and restricted stock unit awards. Weighted average number of common shares outstanding was calculated by using the sum of the shares determined on a daily basis divided by the number of days in the period. The table below reconciles the Company’s earnings per share (in thousands, except for per share data):

	Year Ended December 31,
	2016			2015		2014
Income (loss) from continuing operations	$	(63,846	)	$	66,821	$	87,907
Income from discontinued operations, net of tax (1)	—			—		618
Net income (loss)	$	(63,846	)	$	66,821	$	88,525
Weighted average number of shares of common stock outstanding	36,248			35,755		36,172
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	—			547		520
Weighted average number of dilutive shares of common stock outstanding	36,248			36,302		36,692
Earnings (loss) per common share:
Basic earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.87	$	2.43
Basic earnings per common share from discontinued operations	—			—		0.02
Basic earnings (loss) per common share	$	(1.76	)	$	1.87	$	2.45
Diluted earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.84	$	2.40
Diluted earnings per common share from discontinued operations	—			—		0.01
Diluted earnings (loss) per common share	$	(1.76	)	$	1.84	$	2.41

⁽¹⁾  On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

⁽²⁾  Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

⁽³⁾  For the years ended December 31, 2016, 2015 and 2014, the 2019 convertible senior notes issued in August 2012 were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of our 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation. See Note 6 for further information.

⁽⁴⁾  Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 8 for further information regarding certain of the Company’s restricted stock unit awards.

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Defined Contribution Plan

12 Months Ended

Dec. 31, 2016

Defined Contribution Plan

Defined Contribution Plan

The Company offers a 401(k) plan to all full-time employees. Employees must be at least eighteen years of age and have completed three months of service to be eligible for participation. Participants may elect to defer up to 60% of their compensation, subject to certain statutorily established limits. The Company may elect to make annual matching and profit sharing contributions to the 401(k) plan. In response to weak market conditions, the Company temporarily ceased matching contributions to the 401(k) plan effective January 1, 2015. During the year ended December 31, 2014, the Company made contributions to the 401(k) plan of approximately $6.0 million.

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	December 31,
	2016			2015
Offshore supply vessels and multi-purpose support vessels	$	2,825,389		$	2,409,221
Non-vessel related property, plant and equipment	132,320			132,034
Less: Accumulated depreciation	(539,561		)	(452,134		)
	2,418,148			2,089,121
Construction in progress	160,240			485,540
	$	2,578,388		$	2,574,661

In November 2011, the Company announced, and later expanded, its fifth OSV newbuild program. This program consisted of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MSPVs. As of December 31, 2016, the Company had placed in service 22 vessels under this newbuild program. During February 2016, the Company announced plans to enhance the marketability of the four then-remaining 310 class MPSVs. The first two of those MPSVs, which were delivered in the third quarter of 2016, were enhanced by increasing the berthing capacity, expanding the cargo carrying capabilities and expanding the work area for ROVs. The functionality of each of the second two MPSVs, which are still under construction, will be increased by adding a 60-foot mid-body plug, installing of an additional crane, increasing the berthing capacity, expanding the cargo-carrying capacities and expanding the work areas for ROVs. These latter two MPSVs have been upgraded to a 400 class designation.

In August 2016, the Company announced that it had reached an agreement with the shipyard to postpone the delivery of the final two 400 class MPSVs to be delivered under this program to the first and third quarters of 2018 without any additional cost to the Company. In addition, the payment terms for the remainder of the contract were adjusted to shift $43.3 million of construction milestone draws from the remainder of 2016 and 2017 into 2018.

Based on current contracts and internal estimates, the aggregate total cost of this program, before construction period interest, is expected to be approximately $1,335.0 million. From the inception of this program through December 31, 2016, the Company has incurred $1,264.0 million, or 94.7%, of total expected project costs.

During 2015, the Company closed on the sale of four 250EDF class OSVs, the HOS Arrowhead, the HOS Black Powder, the HOS Eagleview and the HOS Westwind, which were previously chartered to the U.S. Navy, for cash consideration of $152.0 million. The sale resulted in a pre-tax gain of approximately $44.1 million ($27.6 million after-tax or $0.76 per diluted share). These vessels are now managed by the Company for the U.S. Navy.

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Long-Term Debt

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

As of the dates indicated below, the Company had the following outstanding long-term debt (in thousands):

	December 31,
	2016		2015
5.875% senior notes due 2020, net of deferred financing costs of $3,025 and $3,944	$	371,975	$	371,056
5.000% senior notes due 2021, net of deferred financing costs of $4,111 and $5,080	445,889		444,920
1.500% convertible senior notes due 2019, net of original issue discount of $31,093 and $41,600 and deferred financing costs of $3,061 and $4,095	265,846		254,305
Revolving credit facility due 2020	—		—
	$	1,083,710	$	1,070,281

The table below summarizes the Company's cash interest payments (in thousands):

	Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020	$	11,000	April 1 and October 1
5.000% senior notes due 2021	11,300		March 1 and September 1
1.500% convertible senior notes due 2019	2,300		March 1 and September 1

Annual maturities of debt, excluding the potential effects of conditions discussed in Convertible Senior Notes, during each year ending December 31, are as follows (in thousands):

2017	$	—
2018	—
2019	300,000
2020	375,000
2021	450,000
Thereafter	—
	$	1,125,000

2020 Senior Notes

On March 2, 2012, the Company issued $375.0 million in aggregate principal amount of 2020 senior notes, governed by an indenture, or the 2012 indenture. The net proceeds to the Company from the offering were approximately $367.4 million, net of transaction costs. The Company used $259.9 million of such proceeds on March 16, 2012 to repurchase approximately 84% of its outstanding 2014 senior notes pursuant to its tender offer for such notes. The Company used $49.5 million of proceeds on April 30, 2012 to redeem the remaining 16% of the outstanding 2014 senior notes. The repurchase and redemption of the 2014 senior notes resulted in a loss on early extinguishment of debt of approximately $6.0 million in 2012. The remaining proceeds were used for general corporate purposes, including the construction of vessels under the Company's fifth OSV newbuild program. The 2020 senior notes mature on April 1, 2020 and the effective interest rate is 6.08%. No principal payments are due until maturity. Pursuant to a registered exchange offer, the 2020 senior notes issued in March 2012 that were initially sold pursuant to a private placement were exchanged by the holders for 2020 senior notes with substantially the same terms, except that the issuance of the 2020 senior notes in the exchange offer was registered under the Securities Act. The original 2020 senior notes and the similar notes exchanged were issued under and are entitled to the benefits of the same 2012 indenture.

2021 Senior Notes

On March 14, 2013, the Company issued $450.0 million in aggregate principal amount of 2021 senior notes, governed by an indenture, or the 2013 indenture. The net proceeds to the Company from the offering were approximately $442.4 million, net of transaction costs. The Company used $252.7 million of such proceeds to repurchase approximately 94% of the outstanding 2017 senior notes pursuant to its tender offer for such notes. The Company used approximately $16.6 million of proceeds on May 13, 2013 to redeem the remaining 6% of the outstanding 2017 senior notes. The repurchase and redemption of the 2017 senior notes resulted in a loss on early extinguishment of debt of approximately $25.8 million in 2013. The remaining proceeds have been available for general corporate purposes, including funding for the acquisition, construction or retrofit of vessels. The 2021 senior notes mature on March 1, 2021 and the effective interest rate is 5.21%. No principal payments are due until maturity. Pursuant to a registered exchange offer, the 2021 senior notes issued in March 2013 that were initially sold pursuant to a private placement were exchanged by the holders for 2021 senior notes with substantially the same terms, except that the issuance of the 2021 senior notes in the exchange offer was registered under the Securities Act. The original 2021 senior notes and the similar notes exchanged were issued under and are entitled to the benefits of the same 2013 indenture.

The 2020 senior notes and 2021 senior notes are senior unsecured obligations and rank equally in right of payment with other existing and future senior indebtedness and senior in right of payment to any subordinated indebtedness that may be incurred by the Company in the future. Hornbeck Offshore Services, Inc., as the parent company issuer of the 2020 senior notes and the 2021 senior notes, has no independent assets or operations other than its ownership interest in its subsidiaries and affiliates. There are no significant restrictions on the Company’s ability, or the ability of any guarantor, to obtain funds from its subsidiaries by such means as a dividend or loan. The Company may, at its option, redeem all or part of the 2020 senior notes or 2021 senior notes from time to time at specified redemption prices and subject to certain conditions required by the indentures. The Company is permitted under the terms of the indentures to incur additional indebtedness in the future, provided that certain financial conditions set forth in the indentures are satisfied by the Company.

2019 Convertible Senior Notes

On August 13, 2012, the Company issued $300.0 million of 2019 convertible senior notes, which mature on September 1, 2019. Because the 2019 convertible senior notes are considered to be cash convertible debt, the Company has separately accounted for the liability and equity components of the 2019 convertible senior notes by allocating the $300.0 million in proceeds from the issuance between the liability component and the embedded conversion option, or the equity component. The allocation was conducted by estimating an interest rate at the time of issuance of the 2019 convertible senior notes for similar debt instruments that do not include an embedded conversion feature. A non-convertible interest rate of 5.75% was used to compute the initial fair value of the liability component of $227.6 million. For purposes of the fair value measurement, the Company determined that the valuation of the 2019 convertible senior notes falls under Level 2 of the fair value hierarchy. The excess of the $300.0 million of proceeds from the issuance of the 2019 convertible senior notes over the $227.6 million initial amount allocated to the liability component, or $72.4 million, was allocated to the embedded conversion option, or equity component. This excess was treated as an imputed original issue discount and is being amortized through interest expense, using the effective interest method, over the seven-year term of the 2019 convertible senior notes, which runs through September 1, 2019. The effective interest rate for these notes is 6.23%.

The initial conversion rate of the 2019 convertible senior notes is 18.5718 shares per $1,000 principal amount of notes, which equates to a conversion price of approximately $53.85 per share. The conversion rate was based on the last reported sale price of the Company’s common shares on the New York Stock Exchange of $39.16 on August 7, 2012. The conversion rate will be subject to adjustment in some events but will not be adjusted for accrued interest. In addition,

following certain corporate transactions that constitute “fundamental changes” (as defined in the indenture for the 2019 convertible senior notes), the conversion rate will be increased for holders who elect to convert notes in connection with

such corporate transactions in certain circumstances.

The 2019 convertible senior notes are convertible based on the applicable conversion rate only under the following circumstances:

• prior to June 1, 2019, during any fiscal quarter (and only during that fiscal quarter) commencing after December 31, 2012, if the last reported sale price of the Company’s common stock is greater than or equal to 135% of the conversion price for at least 20 trading days in the period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter; or

• prior to June 1, 2019, during the 5 business-day period after any 10 consecutive trading-day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day in the measurement period was less than 95% of the product of the last reported sale price of the Company’s common stock and the conversion rate on such trading day; or

• upon the occurrence of specified corporate transactions, as defined in the indenture governing the 2019 convertible senior notes; or

• beginning on June 1, 2019 until the close of business on the second scheduled trading day preceding the maturity date.

Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election.

If the holders of the 2019 convertible senior notes exercise the conversion provisions of the 2019 convertible senior notes and the Company elects to settle such conversions partially in cash (which it presently intends to do at least up to the principal amount of the notes), the Company will need to remit such cash amount to the converting holders. For that reason, in any period during which the 2019 convertible senior notes are convertible as provided above, the Company would classify the entire principal amount of the outstanding 2019 convertible senior notes as a current liability in the respective quarter. This evaluation of the classification of amounts outstanding associated with the 2019 convertible senior notes will occur every calendar quarter.

The 2019 convertible senior notes are not redeemable at the option of the Company prior to their maturity. No sinking fund is provided for the 2019 convertible senior notes and the 2019 convertible senior notes are not subject to legal defeasance. If the Company experiences specified types of corporate transactions, including certain change of control events or a de-listing of the Company’s common stock, holders of the 2019 convertible senior notes may require the Company to purchase all or a portion of their 2019 convertible senior notes. Any repurchase of the convertible senior notes pursuant to these provisions will be for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the purchase date.

In connection with the sale of the 2019 convertible senior notes, the Company entered into convertible senior note hedge transactions with respect to its common stock with affiliates of the initial purchasers of the notes, Barclays, Inc., JP Morgan Chase and Wells Fargo Bank, or the counterparties. Each of the 2019 convertible senior note hedge transactions is a privately-negotiated transaction that is economically equivalent to the purchase of call options on the Company’s common stock with strike prices equal to the conversion price of the 2019 convertible senior notes, and is intended to mitigate dilution to the Company’s stockholders and/or offset cash payment due upon the potential future conversion of the 2019 convertible senior notes. Under the 2019 convertible senior note hedge transactions, subject to customary anti-dilution provisions, the counterparties are required to deliver to the Company the approximate number of shares of the Company’s common stock and/or an amount of cash that the Company is obligated to deliver to the holders of the 2019 convertible senior notes assuming the conversion of such notes.

The Company also entered into separate privately-negotiated warrant transactions, whereby the Company sold to each of the counterparties call options to acquire approximately the same number of shares of its common stock underlying the convertible senior note hedge transactions, subject to customary anti-dilution adjustments, at a strike price of $68.53 per share of common stock, which represented a 75.0% premium over the closing price of the Company’s shares of common stock on August 7, 2012. Upon the exercise of the warrants, if the market price of the common stock exceeds the strike price of the warrants on any day within the valuation period, the Company will be required to deliver the corresponding value to the counterparties, at its option in cash or shares of its common stock. The 2019 convertible senior note hedge and warrant transactions are separate and legally distinct instruments that bind the Company and the counterparties and have no binding effect on the holders of the 2019 convertible senior notes.

For income tax reporting purposes, the Company has elected to integrate the 2019 convertible senior notes and the note hedge transactions. Integration of the 2019 convertible senior note hedge with the 2019 convertible senior notes creates an in-substance original issue debt discount for income tax reporting purposes and, therefore, the cost of the 2019 convertible senior note hedge is accounted for as interest expense over the term of the 2019 convertible senior notes for income tax reporting purposes. The associated income tax deductions will be recognized in the period that the deduction is taken for income tax reporting purposes. The Company has also treated the proceeds from the sale of warrants as a non-taxable increase in additional paid-in capital in stockholders’ equity.

The Company used a portion of the $290.8 million in net proceeds of the 2019 convertible senior notes offering, along with a portion of the $48.2 million in proceeds from the sale of warrants, to fund the $73.0 million cost of convertible senior note hedge transactions. The Company used a portion of the remaining net proceeds of approximately $266.0 million from the sale of the 2019 convertible senior notes and the sale of the warrants to retire its 2026 convertible senior notes, which were converted or redeemed by the Company in November 2013.

The Company incurred $9.3 million of fees and other costs related to the issuance of the 2019 convertible senior notes. These fees and other origination costs have been allocated to the liability and equity components of the 2019 convertible senior notes in proportion to their allocated values. Approximately $2.2 million of these fees and other origination costs were recorded as a reduction in additional paid-in capital. The remaining $7.1 million of fees and other costs are being amortized as interest expense over the seven-year term of the 2019 convertible senior notes, which runs through September 1, 2019.

Hornbeck Offshore Services, Inc., as the parent company issuer of the 2019 convertible senior notes, has no independent assets or operations other than its ownership interest in its subsidiaries and affiliates. There are no significant restrictions on the Company’s ability or the ability of any guarantor to obtain funds from its subsidiaries by such means as a dividend or loan. The 2019 convertible senior notes are general unsecured, senior obligations of the Company, ranking equally in right of payment with all of its existing and future senior indebtedness, including its 2020 and 2021 senior notes.

The 2019 convertible senior notes, the 2020 senior notes and the 2021 senior notes are guaranteed by certain of the Company’s subsidiaries. The guarantees are full and unconditional, joint and several, and prior to the fourth quarter of 2015, all of the Company's non-guarantor subsidiaries were minor as defined in the Securities and Exchange Commission regulations.

Revolving Credit Facility

On July 29, 2016, the Company amended its existing revolving credit facility. The amended facility provides continued access to a reduced level of standby liquidity for working capital and general corporate purposes, including acquisitions, newbuild and conversion programs and other capital expenditures. The changes to the Company’s revolving credit facility were effective July 29, 2016, and commenced with the fiscal quarter ending September 30, 2016. The more significant changes to the facility are noted below:

• reduce the borrowing base from $300.0 million to $200.0 million;

• increase the unused commitment fee to 50 basis points for all pricing levels;

• increase the London Interbank Offered Rate, or LIBOR, spreads on funded borrowings by 25 basis points for all pricing levels;

• increase the minimum collateral-to-loan value ratio from 150% of the borrowing base to 200% of the borrowing base, which resulted in a decrease in the fair value of collateral pledged from $450.0 million to $400.0 million;

• delay the previously scheduled step-down in the total debt-to-capitalization ratio, as defined, from 55% to 50% by six quarters to commence with the fiscal quarter ending September 30, 2018;

• reduce the minimum interest coverage ratio from 3.00x to 1.00x with a step-up to 1.25x for the fiscal quarter ending September 30, 2018 and a step-up to 1.50x for the fiscal quarter ending March 31, 2019;

• allow the Company the option of making a one-time election to suspend the interest coverage ratio for a holiday period of no more than four quarters, ending no later than December 31, 2017, with a single permitted rescission. If the Company elects to exercise the interest coverage holiday, then the borrowing base will be capped at $75.0 million during the holiday and the LIBOR spreads for funded borrowings will be increased by an additional 50 basis points during and after the interest coverage holiday;

• include an anti-cash hoarding provision that limits the Company's cash balance to no more than $50.0 million at any time during which the revolving credit facility is drawn;

• increase minimum liquidity (cash and credit facility availability) required for prepayment of the Company's 2019 convertible senior notes, 2020 senior notes, and 2021 senior notes from $100.0 million to $150.0 million subject to a maximum senior secured leverage ratio of 2-to-1;

• permit the Company to create one or more Investment Entities, as defined. The Investment Entities would be capitalized (i) by the Company, by transferring certain vessels identified in the First Amendment and (ii) by one or more unaffiliated third parties, by depositing cash, with the cash funding being available for acquisitions;

• amend the definitions of EBITDA and Pro Forma EBITDA to provide that, commencing with the earlier of (a) the first full fiscal quarter after the expiration of the interest coverage holiday and (b) the fiscal quarter ending March 31, 2018, or the Applicable Period, and until the third immediately following fiscal quarter thereafter, EBITDA and Pro Forma EBITDA, as applicable, shall mean, with respect to the Company and its consolidated subsidiaries, (a) for the Applicable Period, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarter multiplied by four, (b) for the Applicable Period and the immediately following fiscal quarter, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarters multiplied by two, and (c) for the Applicable Period and the two immediately following fiscal quarters, EBITDA, or Pro Forma EBITDA, as applicable, for such fiscal quarters multiplied by one and one-third;

• reduce the amount of liens permitted to secure debt (other than the Amended Facility) of any loan party from $50.0 million at any one time to $15.0 million, and to prohibit such liens during the interest coverage holiday;

• condition Restricted Payments, as defined, on pro forma compliance with the interest coverage ratio and the total debt-to-capitalization ratio and compliance with a maximum senior secured leverage ratio of 2-to-1;

• increase the amount of cash or cash equivalents on deposit or unused availability under the Amended Facility or a combination of both from $20.0 million to $100.0 million and require a maximum senior secured leverage ratio of 2-to-1 in order to permit a loan party to merge with another person, acquire or form a new subsidiary, make an investment (other than in an Investment Entity) or acquire any vessel or other capital assets; and

• limit sales or other dispositions of property or subsidiaries owning properties, other than inventory, certain equipment or investments in the Investment Entities, to (i) less than twenty percent of the consolidated net tangible assets of the Company if at the time of such sale or disposition the senior secured leverage ratio is less than or equal to 2-to-1, or (ii) less than ten percent of the consolidated net tangible assets of the Company if at the time of such sale or disposition the senior secured leverage ratio is greater than 2-to-1.

Other than these key changes, all other definitions and substantive terms in the Company’s credit agreement governing its revolving credit facility were unchanged by the July 2016 amendment and remain in effect through the remaining life of the facility.

As of December 31, 2016, there were no amounts drawn under the Company’s $200.0 million revolving credit facility and no letters of credit were outstanding. As of December 31, 2016, the Company was in compliance with all financial covenants contained in its amended revolving credit facility.

The credit agreement governing the amended revolving credit facility and the indentures governing the Company’s 2020 senior notes and 2021 senior notes impose certain operating and financial restrictions on the Company. Such restrictions affect, and in many cases limit or prohibit, among other things, the Company’s ability to incur additional indebtedness, make capital expenditures, redeem equity, create liens, sell assets and make dividend or other restricted payments.

The Company estimates the fair value of its 2020 senior notes, 2021 senior notes and 2019 convertible senior notes by primarily using quoted market prices. The fair value of the Company’s revolving credit facility, when there are outstanding balances, approximates its carrying value. Given the observable nature of the inputs to these estimates, the fair values presented below for long-term debt have been assigned a Level 2, of the three-level valuation hierarchy. As of the dates indicated below, the Company had the following face values, carrying values and fair values (in thousands):

	December 31, 2016						December 31, 2015
	Face Value		Carrying Value		Fair Value		Face Value		Carrying Value		Fair Value
5.875% senior notes due 2020	$	375,000	$	371,975	$	270,938	$	375,000	$	371,056	$	257,813
5.000% senior notes due 2021	450,000		445,889		301,343		450,000		444,920		308,250
1.500% convertible senior notes due 2019	300,000		265,846		216,195		300,000		254,305		170,340
	$	1,125,000	$	1,083,710	$	788,476	$	1,125,000	$	1,070,281	$	736,403

Capitalized Interest

Interest expense excludes capitalized interest related to the construction or conversion of vessels in the approximate amount of $16.7 million, $24.7 million, and $33.2 million, for the years ended December 31, 2016, 2015, and 2014, respectively.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock

The Company’s certificate of incorporation authorizes 5.0 million shares of preferred stock. The Board of Directors has the authority to issue preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof, including dividend rights, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences and the number of shares constituting any series or the designation of such series, without further vote or action by the Company’s stockholders.

Stockholder Rights Plan

On July 1, 2013, the Company’s Board of Directors implemented a stockholder rights plan establishing one right for each outstanding share of common stock. The rights become exercisable, and transferable apart from the Company’s common stock, 10 business days following a public announcement that a person or group has acquired beneficial ownership of, or has commenced a tender or exchange offer for, 10% or more of the Company’s common stock. This stockholder rights plan is substantially similar to the Company's prior stockholder rights plan that expired on June 17, 2013.

Repurchases of Common Stock

On October 28, 2014, the Company's Board of Directors authorized the Company to repurchase up to $150.0 million in shares of its common stock using different methods including, but not limited to, open-market purchases, privately negotiated transactions, accelerated share repurchases and Rule 10b5-1 trading plans. The timing and amount of the repurchases will depend on several factors, such as market conditions, applicable legal requirements, available liquidity, the discretion of management and other appropriate factors. The repurchase program does not obligate the Company to acquire any particular amount of common stock and may be modified, suspended or discontinued at any time. During the fourth quarter of 2014, the Company repurchased and retired 891,396 shares at an average price of $28.05 per share. The repurchased shares cost a total of $25.0 million and represent roughly 2.5% of the Company's total shares outstanding prior to the commencement of the program. The Company has not repurchased any additional shares subsequent to December 31, 2014.

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2016

Stock-Based Compensation

Stock-Based Compensation

Incentive Compensation Plan

The Company’s stock-based incentive compensation plan covers a maximum of 4.95 million shares of common stock that allows the Company to grant restricted stock awards, restricted stock unit awards, or collectively restricted stock, stock options, stock appreciation rights and fully-vested common stock to officers, other employees and directors. As of December 31, 2016, there were 542,266 shares available for future issuance to employees under the incentive compensation plan. The issuance of shares of common stock under the incentive compensation plan has been registered on Form S-8 with the Securities and Exchange Commission.

The financial impact of stock-based compensation expense related to the Company’s incentive compensation plan on its operating results are reflected in the table below (in thousands, except for per share data):

	Year Ended December 31,
	2016		2015		2014
Income before taxes	$	9,983	$	10,293	$	10,324
Net income	$	5,829	$	6,454	$	6,471
Earnings per common share:
Basic	$	0.16	$	0.18	$	0.18
Diluted	$	0.16	$	0.18	$	0.18

The accounting rules also require the benefits of tax deductions in excess of recognized compensation expense to be reported as financing cash flows, rather than as operating cash flows. The Company recorded the impact on cash flows from operating activities for tax shortfalls of approximately $1.9 million and $0.6 million for the years ended December 31, 2016 and 2015, respectively. The Company recorded the impact on cash flows used in financing activities for tax windfalls of approximately $0.3 million for the year ended December 31, 2014. Net cash proceeds from the exercise of stock options were $0.0 million, $0.1 million and $1.4 million for the years ended December 31, 2016, 2015 and 2014, respectively. The income tax expense (benefit) from stock option exercises and restricted stock vesting was $(1.9) million, $(0.6) million and $0.3 million for the respective periods.

Stock Options

The Company is authorized to grant stock options under its incentive compensation plan in which the purchase price of the stock subject to each option is established as the closing price on the New York Stock Exchange of the Company’s common stock on the date of grant and accordingly is not less than the fair market value of the stock on the date of grant. All options granted expire ten years after the date of grant, have an exercise price equal to or greater than the actual or estimated market price of the Company’s stock on the date of grant and vest over a three-year period. The Company has not granted stock options to any directors, executive officers or employees since 2011. The Company has recorded approximately $0.0 million, $0.0 million and $0.1 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with stock options.

The following table represents the Company’s stock option activity for the year ended December 31, 2016 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2016	304		$	28.11	3.2	$	—
Grants	—		—		—	—
Exercised	—		—		—	—
Forfeited or expired	(119	)	33.15		n/a	n/a
Options outstanding at December 31, 2016	185		$	24.86	4.1	$	—
Exercisable options outstanding at December 31, 2016	185		$	24.86	4.1	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2015 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2015	345		$	27.98	3.7	$	59
Grants	—		—		—	—
Exercised	(1	)	22.28		n/a	2
Forfeited or expired	(40	)	27.27		n/a	n/a
Options outstanding at December 31, 2015	304		$	28.11	3.2	$	—
Exercisable options outstanding at December 31, 2015	304		$	28.11	3.2	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2014 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2014	405		$	27.16	4.2	$	8,951
Grants	—		—		—	—
Exercised	(60	)	22.49		n/a	684
Forfeited or expired	—		—		—	—
Options outstanding at December 31, 2014	345		$	27.98	3.7	$	59
Exercisable options outstanding at December 31, 2014	345		$	27.98	3.7	$	59

Restricted Stock

Equity-Settled Restricted Stock

The Company’s incentive compensation plan allows the Company to issue restricted stock units, with either performance-based or time-based vesting provisions. The Company has granted performance-based restricted stock unit awards, which calculates the shares to be received based on the Company’s achievement of certain internal performance criteria over a three-year period as defined by the restricted stock unit agreement governing such awards. Performance for these types of awards has historically been measured by a number of factors that may differ from year to year, including such examples as the Company achieving a targeted return on invested capital, operating profit margin compared to peers, and safety record. The actual number of shares that could be received by the award recipients for the years in question can range from 0% to 150% of the Company’s base share awards depending on the number and/or extent of performance goals attained by the Company. Compensation expense related to performance-based restricted stock unit awards is recognized over the period the restrictions lapse, from one to three years, based on the market price of the Company's stock on the date of grant applied to the shares that are expected to vest. The compensation expense related to time-based restricted stock unit awards, which is amortized over a one to three-year vesting period, is determined based on the market price of the Company’s stock on the date of grant applied to the total shares that are expected to fully vest. As of December 31, 2016, the Company had unamortized stock-based compensation expense of $4.6 million, which will be recognized on a straight-line basis over the remaining vesting period, or 1.1 years. In addition, the Company has recorded approximately $6.8 million, $9.3 million and $9.0 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with restricted stock-based unit awards.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2016	726		$	30.12
Granted during the period	537		6.44
Change in estimated payout of performance unit awards(1)	(95	)	27.52
Cancellations during the period	—		—
Vested	(348	)	23.50
Outstanding, as of December 31, 2016	820		$	17.72

⁽¹⁾    Annually the Company reviews the performance compared to pre-determined targets for outstanding performance unit awards. Based on current projections, the Company may increase or decrease the anticipated payout based on its historical operating results and near-term projections.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2015	590		$	37.13
Granted during the period(1)	479		21.40
Cancellations during the period	(104	)	21.84
Vested	(239	)	33.60
Outstanding, as of December 31, 2015	726		$	30.12

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2014	570		$	31.61
Granted during the period(1)	274		42.61
Cancellations during the period	—		—
Vested	(254	)	30.68
Outstanding, as of December 31, 2014	590		$	37.13

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

Cash-Settled Restricted Stock

The Company’s incentive compensation plan allows the Company to issue restricted stock units with cash-settled vesting provisions. The compensation expense related to cash-settled restricted stock unit awards is amortized over a vesting period of up to three years, as applicable, and is determined based on the market price of the Company’s stock on the date of grant applied to the total shares that are expected to fully vest. The cash-settled restricted stock units are re-measured quarterly based on the period-end market price of the Company's common stock and are classified as a liability, due to the settlement of these awards in cash. As of December 31, 2016, the Company had unamortized cash-settled restricted stock compensation expense of $5.1 million, which will be recognized on a straight-line basis over the remaining vesting period, or 1.8 years. In addition, the Company recorded approximately $2.6 million, $(0.2) million, and $(0.1) million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with cash-settled restricted stock unit awards.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2016	82		$	30.61
Granted during the period(2)	991		6.14
Cancellations during the period	(5	)	19.05
Vested	(15	)	34.32
Outstanding, as of December 31, 2016	1,053		$	7.60

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

⁽²⁾  Includes only the base shares awarded for both time-based and performance based awards. The performance-based awards have the potential to vest at up to 150% of the aggregate total of the base share awards.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2015	153		$	38.43
Granted during the period	47		21.84
Cancellations during the period	(1	)	30.87
Vested	(117	)	37.25
Outstanding, as of December 31, 2015	82		$	30.61

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2014	139		$	37.25
Granted during the period	35		43.00
Cancellations during the period	(3	)	39.14
Vested	(18	)	37.88
Outstanding, as of December 31, 2014	153		$	38.43

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

Employee Stock Purchase Plan

On May 3, 2005, the Company established the Hornbeck Offshore Services, Inc. 2005 Employee Stock Purchase Plan, or ESPP, which was adopted by the Company’s Board of Directors and approved by the Company’s stockholders. Under the ESPP, the Company is presently authorized to issue up to 2.2 million shares of common stock to eligible employees of the Company and its designated subsidiaries. Employees have the opportunity to purchase shares of the Company’s common stock at periodic intervals through accumulated payroll deductions that will be applied at semi-annual intervals to purchase shares of common stock at a discount from the market price as defined by the ESPP. The ESPP is designed to satisfy the requirements of Section 423 of the Internal Revenue Code of 1986, as amended, and thereby allows participating employees to defer recognition of taxes when purchasing the shares of common stock at a 15% discount under the ESPP. The Company has an effective Registration Statement on Form S-8 with the Commission registering the issuance of shares of common stock under the ESPP. As of December 31, 2016, there were 1.1 million shares available for future issuance to employees under the ESPP. The Company recorded approximately $0.6 million, $1.2 million, and $1.2 million of compensation expense during the years ended December 31, 2016, 2015 and 2014, respectively, associated with the ESPP.

The fair value of the employees’ stock purchase rights granted under the ESPP was estimated using the Black-Scholes model with the following assumptions for the years ended December 31, 2016 and 2015:

	2016			2015
Dividend yield	—		%	—		%
Expected volatility	91.6		%	61.3		%
Risk-free interest rate	0.5		%	0.3		%
Expected term (months)	6			6
Weighted-average grant-date fair value per share	$	3.14		$	4.86

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Income Taxes

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The net long-term deferred tax liabilities in the accompanying consolidated balance sheets include the following components (in thousands):

	Year Ended December 31,
	2016			2015			2014
Deferred tax liabilities:
Fixed assets	$	490,221		$	472,817		$	489,060
Deferred charges and other liabilities	10,908			11,317			18,013
Total deferred tax liabilities	501,129			484,134			507,073
Deferred tax assets:
Net operating loss carryforwards	(111,147		)	(52,374		)	(116,676		)
Allowance for doubtful accounts	(763		)	(1,036		)	(1,330		)
Stock-based compensation expense	(4,033		)	(4,830		)	(4,246		)
Alternative minimum tax credit carryforward	(20,863		)	(20,863		)	(20,863		)
Foreign tax credit carryforward	(17,554		)	(17,972		)	(12,332		)
Other	(6,044		)	(5,440		)	(5,676		)
Total deferred tax assets	(160,404		)	(102,515		)	(161,123		)
Valuation allowance	2,295			—			1,011
Total deferred tax liabilities, net	$	343,020		$	381,619		$	346,961

The components of the income tax expense follow (in thousands):

	Year Ended December 31,
	2016			2015		2014
Current tax expense (benefit):
U.S.	$	709		$	—	$	—
Foreign	(257		)	5,671		1,927
Total current tax expense	452			5,671		1,927
Deferred tax expense:
U.S.	(45,958		)	34,086		50,440
Total tax expense (benefit)	$	(45,506	)	$	39,757	$	52,367

Income from continuing operations before income taxes, based on jurisdiction earned, was as follows (in thousands):

	Year Ended December 31,
	2016			2015		2014
U.S.	$	(93,704	)	$	65,894	$	105,066
Foreign	(15,648		)	40,684		35,208
Total income (loss) from continuing operations before income taxes	$	(109,352	)	$	106,578	$	140,274

At December 31, 2016, the Company had federal tax net operating loss carryforwards of approximately $315.2 million, which will expire in 2031 through 2036 and foreign tax credit carryforwards of approximately $16.4 million, which will expire in 2019 through 2026. The Company has state tax net operating loss carryforwards of approximately $88.5 million, which will expire in 2030 through 2036 and can only be utilized if the Company generates taxable income in that particular jurisdiction.

As a result of the sale of the Downstream segment during the third quarter of 2013, the Company believed that certain state operating loss carryforwards might not be realizable and thus recorded a valuation allowance of $0.9 million for the year ended December 31, 2013. During 2014, the Company recorded an additional valuation allowance of $0.1 million related to those state operating losses. During 2015, the total valuation allowance of $1.0 million was reversed as these state operating losses were written off upon ceasing to do business in those particular jurisdictions. During the fourth quarter of 2016, the Company recorded a valuation allowance of $2.3 million related to foreign tax credits expiring in 2019. The Company has weighed the evidence, primarily net book income projections, and has concluded that it is more likely than not that the Company will not generate sufficient taxable income to utilize these credits by their expiration date of December 31, 2019.

The Company is no longer subject to tax audits by federal, state or local taxing authorities for years prior to 2012. The Company has ongoing examinations by various foreign tax authorities but does not believe that the results of these examinations will have a material adverse effect on the Company’s financial position or results of operations.

The following table reconciles the difference between the Company’s income tax provision calculated at the federal statutory rate of 35% and the actual income tax provision (in thousands):

	Year Ended December 31,
	2016			2015			2014
Statutory rate	$	(38,274	)	$	37,302		$	49,096
State taxes, net	(1,094		)	1,066			1,403
Non-deductible expense	1,070			1,440			1,927
Valuation allowance	2,295			(1,011		)	99
Income excluded from U.S. taxable income	(9,478		)	—			—
Foreign taxes and other	(25		)	960			(158		)
	$	(45,506	)	$	39,757		$	52,367

Due to a favorable election included in the Company's 2015 tax return, which was filed during the fourth quarter of 2016, the results of one of the Company's vessels was excluded from U.S. taxable income and was taxed based on its daily notional shipping income, as defined. This resulted in a favorable impact on deferred tax expense of $9.5 million. The Company does not anticipate having any vessels qualify for this election in the foreseeable future.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies

Commitments and Contingencies

Vessel Construction

In November 2011, the Company announced, and later expanded, its fifth OSV newbuild program. This program consisted of vessel construction contracts with three domestic shipyards to build four 300 class OSVs, five 310 class OSVs, ten 320 class OSVs, three 310 class MPSVs and two 400 class MPSVs. As of December 31, 2016, the Company had placed in service 22 vessels under such program. The two remaining vessels under this 24-vessel domestic newbuild program are currently expected to be placed in service during 2018. Based on current contracts and internal estimates, the aggregate total cost of this program, before construction period interest, is expected to be approximately $1,335.0 million. From the inception of this program through December 31, 2016, the Company had incurred construction costs of approximately $1,264.0 million, or 94.7%, of total expected project costs.

Operating Leases

The Company is obligated under certain operating leases for office space and shore-base facilities. The Covington facility lease provides for an initial term expiring in September 2025 with three additional five-year renewal period options. The Company leases two adjacent shore-base facilities in Port Fourchon. At December 31, 2016, the leases had approximately two years remaining on their existing terms and the Company has multiple renewal options on such facilities. Rent expense related to operating leases was approximately $4.0 million, $4.1 million and $3.9 million for the years ending December 31, 2016, 2015 and 2014, respectively.

Future minimum payments under noncancelable leases for years subsequent to 2016 are as follows (in thousands): 

Year Ended December 31,
2017	$	2,826
2018	2,377
2019	2,409
2020	2,456
2021	2,524
Thereafter	24,662
Total	$	37,254

Contingencies

In the normal course of its business, the Company becomes involved in various claims and legal proceedings in which monetary damages are sought. It is management’s opinion that the Company’s liability, if any, under such claims or proceedings would not materially affect the Company's financial position or results of operations. The Company insures against losses relating to its vessels, pollution and third party liabilities, including claims by employees under Section 33 of the Merchant Marine Act of 1920, or the Jones Act. Third party liabilities and pollution claims that relate to vessel operations are covered by the Company’s entry in a mutual protection and indemnity association, or P&I Club, as well as by marine liability policies in excess of the P&I Club’s coverage. The Company provides reserves for any individual claim deductibles for which the Company remains responsible by using an estimation process that considers Company-specific and industry data, as well as management’s experience, assumptions and consultation with outside counsel. As additional information becomes available, the Company will assess the potential liability related to its pending claims and revise its estimates. Although historically revisions to such estimates have not been material, changes in estimates of the potential liability could materially impact the Company’s results of operations, financial position or cash flows.

During 2013, the Company commenced the process of assigning the in-country vessel management services for its four vessels operating in Brazil from a third party provider to a wholly-owned subsidiary of the Company. As a result, this assignment may be interpreted by local authorities as a new importation of these vessels resulting in an importation assessment ranging from $0.5 million to $3.5 million. The Company disagrees with this interpretation. During the third quarter of 2015, the Brazilian court ruled in the Company's favor related to these claims and this decision has been appealed to a higher court. As of December 31, 2016, these potential duties have not been assessed or recorded in its financial statements. While the Company cannot estimate the amounts or timing of the resolution of this matter, the Company believes that the outcome will not have a material impact on its liquidity or financial position, but the ultimate resolution could have a material impact on its interim or annual results of operations. 

During 2012, a customer, ATP Oil and Gas, Inc., initiated a reorganization proceeding under Chapter 11 of the United States Bankruptcy Code, which in June 2014 was converted to a Chapter 7 case. Pre-petition receivables from ATP were $4.8 million and the Company has recorded $0.9 million in reserves. The Company believes its claim is secured under the Louisiana Oil Well Lien Act. A legal challenge related to the Company's liens has been raised in the bankruptcy proceedings by parties whose interests are affected by the liens. The Company, together with its outside legal counsel, believe its lien position is valid, but the Bankruptcy Court has disagreed. The matter is now being reviewed on appeal by the federal district court in Houston, Texas. An unfavorable final judgment would render the Company's position to that of an unsecured creditor in the bankruptcy proceeding. While the Company believes that the net receivables are collectible based on its position with respect to its liens, it will continue to monitor the proceedings, which may result in actual collections that may materially differ from the current estimate.

Vessel charters with Petrobras included limitations regarding fuel consumption. Petrobras had asserted claims against the Company relating to excess fuel consumption in 2010 and 2011. The Company’s exposure for these assessments, net of amounts accrued, was in the range of approximately $0.5 million to $3.0 million. The Company disagreed with a majority of these assessments. During the second quarter of 2015, the Brazilian court ruled in the Company's favor related to these claims. Subsequent to this ruling, Petrobras had filed and was denied multiple appeals. Petrobras had requested a final review of the case by the Supreme Court and, during the fourth quarter of 2016, this request was denied.

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Deferred Charges

12 Months Ended

Dec. 31, 2016

Deferred Charges

Deferred Charges

Deferred charges include the following (in thousands):

	Year Ended December 31,
	2016		2015
Deferred drydocking costs, net of accumulated amortization of $34,313 and $41,784 respectively	$	13,808	$	29,228
Prepaid lease expense, net of amortization of $1,700 and $1,542, respectively	2,688		2,847
Revolving credit facility deferred financing costs, net of accumulated amortization of $349 and $4,070 respectively	2,581		3,198
Total	$	19,077	$	35,273

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Other Accrued Liabilities (Notes)

12 Months Ended

Dec. 31, 2016

Accrued Liabilities, Current [Abstract]

Other Liabilities Disclosure [Text Block]

Other Accrued Liabilities

Other accrued liabilities include the following (in thousands):

	Year Ended December 31,
	2016		2015
Accrued lease expense	$	4,763	$	4,339
Deferred revenue	2,245		5,734
Current taxes payable	215		3,958
Other	2,787		9,581
Total	$	10,010	$	23,612

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Major Customers

12 Months Ended

Dec. 31, 2016

Major Customers

Major Customers

In the years ended December 31, 2016, 2015, and 2014, revenues from the following customers represent 10% or more of consolidated revenues:

	Year Ended December 31,
	2016			2015			2014
Customer A	21	%		20	%		14	%
Customer B	15	%		n/a		(1)	n/a		(1)
Customer C	13	%		n/a		(1)	n/a		(1)
Customer D	n/a		(1)	10	%		n/a		(1)

⁽¹⁾  Customers represent less than 10% of consolidated revenue in each such year.

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Discontinued Operations

12 Months Ended

Dec. 31, 2016

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

On August 29, 2013, the Company closed the sale of substantially all of the assets and business of its Downstream segment's tug and tank barge fleet. Excluded from the sale were three older, lower-horsepower tugs considered to be non-core assets. During the year ended December 31, 2014, the remaining tugs were sold for net cash proceeds of $1.6 million. These latter sales resulted in a pre-tax gain of approximately 0.9 million ($0.6 million after-tax or $0.02 per diluted share). The historical results for the Downstream segment and the gain on the sale of the three tugs have been presented as discontinued operations for 2014, the only applicable period in the accompanying condensed consolidated financial statements.

Summarized results of the Downstream segment from discontinued operations are as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Revenue	$	—	$	—	$	12
Gain on sale of assets	—		—		867
Operating Income	—		—		555
Income before income taxes	—		—		966
Income tax expense	—		—		348
Income from discontinued operations	—		—		618

At the closing of the sale of the tug and barge assets and the Downstream business in 2013, the Company entered into transition service agreements with Genesis to facilitate the transition of the sale of the business, including ship management agreements and a crew management agreement, pursuant to which the Company provided services related to the operation and management of certain vessels as well as supplying some of the marine crews for those vessels during the transition period. As of December 31, 2014, all of the transition service agreements had terminated.

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Employment Agreements

12 Months Ended

Dec. 31, 2016

Employment Agreements

Employment Agreements

The Company has employment agreements with certain members of its executive management team. These agreements include, among other things, contractually stated base level salaries and a structured cash incentive compensation program dependent upon the Company achieving certain targeted financial results. The agreements typically provide for certain targets such as an EBITDA target, an Operating Margin target and a Safety target, which may be varied from time to time by agreement between the Company and the management executive, as well as a discretionary component. In the event such a member of the executive management team is terminated due to certain events as defined in such officer’s agreement, the employee will continue to receive salary, bonus and other payments for the full remaining term of the agreement. The current term of these employment agreements expires on December 31, 2019 and automatically extends each year thereafter on January 1st, for an additional year.

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Condensed Consolidating Guarantor Financial Information (Notes)

12 Months Ended

Dec. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Condensed Financial Statements

Condensed Consolidating Financial Statements of Guarantors

The following tables present the condensed consolidating historical financial statements as of December 31, 2016 and 2015, and for each of the two years ended December 31, 2016, for the domestic subsidiaries of the Company that serve as guarantors of the Company's 2019 convertible senior notes, 2020 senior notes and 2021 senior notes and the financial results for the Company's subsidiaries that do not serve as guarantors. The guarantor subsidiaries of the 2019 convertible senior notes, 2020 senior notes and 2021 senior notes are 100% owned by the Company. The guarantees are full and unconditional and joint and several. The guarantees are full and unconditional and joint and several and, prior to 2015, all of the Company's non-guarantor subsidiaries were minor as defined in the Securities and Exchange Commission regulations. The non-guarantor subsidiaries of such notes include all of the Company's foreign subsidiaries.

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2016
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	9	$	212,196	$	4,822		$	—		$	217,027
Accounts receivable, net of allowance for doubtful accounts of $2,120	—		30,846		5,704			—			36,550
Other current assets	15		16,176		787			—			16,978
Total current assets	24		259,218		11,313			—			270,555
Property, plant and equipment, net	—		2,449,473		128,915			—			2,578,388
Deferred charges, net	2,581		15,724		772			—			19,077
Intercompany receivable	1,779,872		680,663		107,038			(2,567,573		)	—
Investment in subsidiaries	768,718		8,602		(4,283		)	(773,037		)	—
Other assets	1,744		6,239		2,272			—			10,255
Total assets	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	11,325	$	449		$	—		$	11,774
Accrued interest	14,763		—		—			—			14,763
Accrued payroll and benefits	—		8,104		492			—			8,596
Other accrued liabilities	—		8,463		1,547			—			10,010
Total current liabilities	14,763		27,892		2,488			—			45,143
Long-term debt, net of original issue discount of $31,093 and deferred financing costs of $10,197	1,083,710		—		—			—			1,083,710
Deferred tax liabilities, net	—		337,503		5,517			—			343,020
Intercompany payables	61,715		2,264,900		245,276			(2,571,891		)	—
Other liabilities	—		3,416		(10		)	—			3,406
Total liabilities	1,160,188		2,633,711		253,271			(2,571,891		)	1,475,279
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 36,467 shares issued and outstanding	365		—		—			—			365
Additional paid-in capital	754,394		37,978		4,319			(42,297		)	754,394
Retained earnings	637,992		748,080		(21,658		)	(726,422		)	637,992
Accumulated other comprehensive income	—		150		10,095			—			10,245
Total stockholders’ equity	1,392,751		786,208		(7,244		)	(768,719		)	1,402,996
Total liabilities and stockholders’ equity	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	10	$	252,651	$	7,140		$	—		$	259,801
Accounts receivable, net of allowance for doubtful accounts of $2,877	—		41,963		48,418			821			91,202
Other current assets	12		12,955		66			—			13,033
Total current assets	22		307,569		55,624			821			364,036
Property, plant and equipment, net	—		2,472,367		102,294			—			2,574,661
Deferred charges, net	3,198		56,021		(23,946		)	—			35,273
Intercompany receivable	1,751,046		186,054		59,413			(1,996,513		)	—
Investment in subsidiaries	783,709		8,602		(4,283		)	(788,028		)	—
Other assets	1,743		6,648		2,055			—			10,446
Total assets	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	34,214	$	1,521		$	7		$	35,742
Accrued interest	14,795		—		—			—			14,795
Accrued payroll and benefits	—		9,913		452			—			10,365
Other accrued liabilities	—		16,989		6,623			—			23,612
Total current liabilities	14,795		61,116		8,596			7			84,514
Long-term debt, net of original issue discount of $41,600 and deferred financing costs of $13,119	1,070,281		—		—			—			1,070,281
Deferred tax liabilities, net	—		381,619		—			—			381,619
Intercompany payables	4,403		1,801,829		193,786			(2,000,018		)	—
Other liabilities	—		1,839		—			—			1,839
Total liabilities	1,089,479		2,246,403		202,382			(2,000,011		)	1,538,253
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 35,985 shares issued and outstanding	360		—		—			—			360
Additional paid-in capital	748,043		37,976		4,319			(42,297		)	748,041
Retained earnings	701,836		752,763		(11,349		)	(741,412		)	701,838
Accumulated other comprehensive income (loss)	—		119		(4,195		)	—			(4,076		)
Total stockholders’ equity	1,450,239		790,858		(11,225		)	(783,709		)	1,446,163
Total liabilities and stockholders’ equity	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416

Condensed Consolidating Statement of Operations

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Revenues	$	—		$	213,563		$	8,707		$	2,029	$	224,299
Costs and expenses:
Operating expenses	—			114,783			14,904			1,971		131,658
Depreciation	—			88,443			4,628			—		93,071
Amortization	—			19,024			1,461			—		20,485
General and administrative expenses	184			39,479			3,637			58		43,358
	184			261,729			24,630			2,029		288,572
Gain on sale of assets	—			53			1			—		54
Operating loss	(184		)	(48,113		)	(15,922		)	—		(64,219		)
Other income (expense):
Interest income	—			984			506			—		1,490
Interest expense	(48,673		)	—			(2		)	—		(48,675		)
Equity in earnings (losses) of consolidated subsidiaries	(14,989		)	—			—			14,989		—
Other income (expense), net	—			(2,272		)	4,324			—		2,052
	(63,662		)	(1,288		)	4,828			14,989		(45,133		)
Income (loss) before income taxes	(63,846		)	(49,401		)	(11,094		)	14,989		(109,352		)
Income tax benefit	—			(44,721		)	(785		)	—		(45,506		)
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)
Other comprehensive income:
Foreign currency translation gain	—			31			14,290			—		14,321
Total comprehensive income (loss)	$	(63,846	)	$	(4,649	)	$	3,981		$	14,989	$	(49,525	)

Condensed Consolidating Statement of Operations

(In thousands)

	Year ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Revenues	$	—		$	426,419		$	50,952		$	(1,301	)	$	476,070
Costs and expenses:
Operating expenses	—			178,748			41,514			(1,002		)	219,260
Depreciation	—			81,522			1,044			—			82,566
Amortization	—			25,782			681			—			26,463
General and administrative expenses	189			44,398			3,861			(151		)	48,297
	189			330,450			47,100			(1,153		)	376,586
Gain on sale of assets	—			44,060			—			—			44,060
Operating income (loss)	(189		)	140,029			3,852			(148		)	143,544
Other income (expense):
Interest income	—			1,125			400			—			1,525
Interest expense	(39,460		)	—			(36		)	—			(39,496		)
Equity in earnings (losses) of consolidated subsidiaries	106,798			—			—			(106,798		)	—
Other income (expense), net	—			(4,053		)	5,238			(180		)	1,005
	67,338			(2,928		)	5,602			(106,978		)	(36,966		)
Income (loss) before income taxes	67,149			137,101			9,454			(107,126		)	106,578
Income tax expense	—			35,194			4,563			—			39,757
Net income (loss)	$	67,149		$	101,907		$	4,891		$	(107,126	)	$	66,821

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Net income (loss)	$	67,149	$	101,907		$	4,891		$	(107,126	)	$	66,821
Other comprehensive income:
Foreign currency translation loss	—		(81		)	(3,093		)	—			(3,174		)
Total comprehensive income (loss)	$	67,149	$	101,826		$	1,798		$	(107,126	)	$	63,647

Condensed Consolidating Statements of Cash Flows

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(199	)	$	55,677		$	(2,428	)	$	—	$	53,050
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(76,615		)	338			—		(76,277		)
Net proceeds from sale of assets	—			523			1			—		524
Vessel capital expenditures	—			(19,604		)	(1,085		)	—		(20,689		)
Non-vessel capital expenditures	—			(467		)	(102		)	—		(569		)
Net cash used in investing activities	—			(96,163		)	(848		)	—		(97,011		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(1,102		)	—			—			—		(1,102		)
Net cash proceeds from other shares issued	1,300			—			—			—		1,300
Net cash provided by financing activities	198			—			—			—		198
Effects of exchange rate changes on cash	—			31			958			—		989
Net decrease in cash and cash equivalents	(1		)	(40,455		)	(2,318		)	—		(42,774		)
Cash and cash equivalents at beginning of period	10			252,651			7,140			—		259,801
Cash and cash equivalents at end of period	$	9		$	212,196		$	4,822		$	—	$	217,027
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,152		$	—		$	—		$	—	$	50,152
Cash paid for income taxes	$	—		$	1,292		$	2,440		$	—	$	3,732

Condensed Consolidating Statements of Cash Flows

(In thousands)

	Year Ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(1,029	)	$	109,987		$	106,885		$	—	$	215,843
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(120,767		)	(69,303		)	—		(190,070		)
Net proceeds from sale of assets	—			152,000			—			—		152,000
Vessel capital expenditures	—			(55,724		)	(31,068		)	—		(86,792		)
Non-vessel capital expenditures	—			(16,211		)	(276		)	—		(16,487		)
Net cash used in investing activities	—			(40,702		)	(100,647		)	—		(141,349		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(2,089		)	—			—			—		(2,089		)
Net cash proceeds from other shares issued	3,112			—			—			—		3,112
Net cash provided by financing activities	1,023			—			—			—		1,023
Effects of exchange rate changes on cash	—			(81		)	(758		)	—		(839		)
Net increase (decrease) in cash and cash equivalents	(6		)	69,204			5,480			—		74,678
Cash and cash equivalents at beginning of period	16			183,447			1,660			—		185,123
Cash and cash equivalents at end of period	$	10		$	252,651		$	7,140		$	—	$	259,801
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,492		$	—		$	—		$	—	$	50,492
Cash paid for income taxes	$	—		$	582		$	4,226		$	—	$	4,808

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Supplemental Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2016

Supplemental Selected Quarterly Financial Data

Supplemental Selected Quarterly Financial Data (Unaudited) (in thousands, except per share data):

The following table contains selected unaudited quarterly financial data from the consolidated statements of operations for each quarter of fiscal years 2016 and 2015. The operating results for any quarter are not necessarily indicative of results for any future period.

	Quarter Ended
	Mar 31			Jun 30			Sep 30			Dec 31
Fiscal Year 2016(1)(2)
Revenues	$	76,820		$	53,673		$	51,927		$	41,879
Operating loss	(780		)	(21,510		)	(14,445		)	(27,484		)
Net loss	(7,514		)	(20,586		)	(16,503		)	(19,243		)
Earnings (loss) per common share:
Basic loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Diluted loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Fiscal Year 2015(1)(2)
Revenues	$	134,624		$	136,446		$	116,281		$	88,719
Operating income(3)	66,898			39,355			32,809			4,482
Net income (loss)	35,853			19,215			14,424			(2,671		)
Earnings (loss) per common share:
Basic earnings (loss) per common share	$	1.01		$	0.54		$	0.40		$	(0.07	)
Diluted earnings (loss) per common share	$	0.99		$	0.53		$	0.40		$	(0.07	)

⁽¹⁾  The sum of the four quarters may not equal annual results due to rounding.

⁽²⁾  Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

⁽³⁾  During the first quarter of 2015, the Company closed on the sale of three 250EDF class OSVs that were previously chartered to the U.S Navy for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). During the third quarter of 2015, the Company closed on the sale of one 250EDF class OSV that was previously chartered to the U.S Navy for cash consideration of $38.0 million. The sale resulted in a pre-tax gain of approximately $11.0 million ($6.7 million after-tax or $0.19 per diluted share). See Note 5 for further discussion.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2016

Revenue Recognition

Revenue Recognition

The Company charters its OSVs and MPSVs to clients under time charters based on a daily rate of hire and recognizes revenue as earned on a daily basis during the contract period of the specific vessel.

Deferred revenue represents payments received from customers or billings submitted to customers in advance of providing vessel access through time charters or other contracted arrangements.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents consist of all highly liquid investments in money market funds, deposits and investments available for current use with an initial maturity of three months or less.

Accounts Receivable

Accounts Receivable

Accounts receivable consists of trade receivables, net of reserves and amounts to be rebilled to customers.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment is recorded at cost. Depreciation and amortization of equipment and leasehold improvements are computed using the straight-line method based on the estimated useful lives of the related assets. Major modifications and improvements, which extend the useful life of the vessel, are capitalized and amortized over the remaining useful life of the vessel. Gains and losses from retirements or other dispositions are recognized as incurred. Salvage values for new generation marine equipment are estimated to be 25% of the originally recorded cost.

Deferred Charges

Deferred Charges

The Company’s vessels are required by regulation to be recertified after certain periods of time. The Company defers the drydocking expenditures incurred due to regulatory marine inspections and amortizes the costs on a straight-line basis over the period to be benefited from such expenditures (generally 30 months). Financing charges are amortized over the term of the related debt.

Deferred charges also include prepaid lease expenses related to the Company’s shore-base port facility. Such prepaid lease expenses are being amortized on a straight-line basis over the effective remaining term of the lease.

Precontract Costs, Policy

Mobilization Costs

The Company incurs mobilization costs to transit its vessels to and from certain regions and/or for long-term contracts. These costs, which are typically expensed as incurred, include, but are not limited to, fuel, crew wages, vessel modification and pre-positioning expenses, materials and supplies and importation taxes.

Income Taxes

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using currently enacted tax rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The provision for income taxes includes provisions for federal, state and foreign income taxes. Interest and penalties relating to uncertain tax positions are recorded as general and administrative expenses. In addition, the Company provides a valuation allowance for deferred tax assets if it is more likely than not that such items will either expire before the Company is able to realize the benefit or the future deductibility is uncertain. As a result of the sale of the Downstream segment during 2013, the Company believed that certain state operating loss carryforwards would not be realizable and thus recorded a valuation allowance of $0.9 million for the year ended December 31, 2013. During 2014, the Company recorded an additional $0.1 million related to these state operating losses. During 2015, the total valuation allowance of $1.0 million on these state operating losses was reversed since the losses were written off upon ceasing to do business in those particular jurisdictions. As of December 31, 2016, the Company believed that it is more likely than not that foreign tax credits expiring in 2019 will not be fully utilized. In the fourth quarter of 2016, the Company elected to establish a valuation allowance of $2.3 million for the portion of such credits that it has concluded may not be utilized by December 31, 2019.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Commitments and Contingencies, Policy

Legal Liabilities

In the ordinary course of business, the Company may become party to lawsuits, administrative proceedings, or governmental investigations. These matters may involve large or unspecified damages or penalties that may be sought from the Company and may require years to resolve. The Company records a liability related to a loss contingency to such legal matters in accrued liabilities if the Company determines the loss to be both probable and estimable. The liability is recorded for an amount that is management’s best estimate of the loss, or when a best estimate cannot be made, the minimum loss amount of a range of possible outcomes. Significant judgment is required in estimating such liabilities, the results of which can vary significantly from the actual outcomes of lawsuits, administrative proceedings or governmental investigations.

Concentration of Credit Risk

Concentration of Credit Risk

Customers are primarily major and independent, domestic and international, oil and oil service companies, as well as national oil companies and the U.S. military. The Company’s customers are granted credit on a short-term basis and related credit risks are considered minimal. The Company usually does not require collateral. The Company provides an estimate for uncollectible accounts based primarily on management’s judgment using the relative age of customer balances, historical losses, current economic conditions and individual evaluations of each customer to make adjustments to the allowance for doubtful accounts. As of December 31, 2016, one customer represented 14% of the Company's net

accounts receivable balance.

Foreign Currency Transactions and Translations Policy

Foreign Currency Transaction Gains and Losses

Foreign currency transaction gains and losses are recorded in the period incurred except for advances to and investments in foreign subsidiaries.  Foreign currency gains and losses related to advances to or investments in foreign operations are accounted for as a foreign currency translation adjustment and recorded as other comprehensive income. Foreign currency transaction adjustments for fiscal years 2016, 2015 and 2014 were not material to the financial statements.  The balance in accumulated other comprehensive income as of December 31, 2016 relates primarily to the Company’s long term investments in its foreign subsidiaries.

Impairment of Long-Lived Assets

Considerations Regarding Impairment of Long-Lived Assets

In accordance with ASC360, the Company periodically reviews long-lived asset valuations when events or changes in circumstances indicate that an asset's carrying value might not be recoverable. If indicators of impairment exist, the Company assesses the recoverability of its long-lived assets by comparing the projected future undiscounted cash flows associated with the related long-lived asset group over their remaining estimated useful lives. If the sum of the estimated undiscounted cash flows is less than the carrying amounts of the asset group, the assets would be written down to their estimated fair values based on the expected discounted future cash flows or appraised values attributable to the assets. The future cash flows are subjective and are based on the Company's current assumptions regarding future dayrates, utilization, operating expense, G&A expense and recertification costs that could differ from actual results.

As of June 30, 2016, the Company determined that it observed indicators of impairment related to its vessels. This resulted from the rapid deterioration of its second quarter 2016 operating results, as well as the uncertainty regarding future market conditions and the related impact on the Company's projected operating results. For the purposes of calculating the undiscounted cash flows, the Company groups its vessels into two groups, OSVs and MPSVs, and used a probability-weighted undiscounted cash flow projection to test for recoverability. After reviewing the results of this calculation, the Company determined that each of its asset groups has sufficient projected undiscounted cash flows to recover the remaining book value of the Company's long-lived assets within such group. During the second half of 2016, the Company reviewed the assumptions used in preparing the undiscounted cash flow projections and it concluded that such assumptions remain consistent with current market conditions. In addition, the Company has not observed any additional indicators of impairment related to its vessels during the second half of 2016 and the assumptions used to determine undiscounted cash flows remain appropriate. No triggering events occurred in 2015 or 2014 and the Company did not record any impairment losses related to its long-lived assets during those periods. The Company will continue to closely monitor market conditions and potential impairment indicators as long as this market downturn persists.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Estimated Useful Lives by Classification

The estimated useful lives by classification are as follows:

Offshore supply vessels	25 years
Multi-purpose support vessels	25 years
Non-vessel related property, plant and equipment	3-28 years

See “Considerations Regarding Impairment of Long-Lived Assets” below for more information.

Allowance for Doubtful Accounts

The following table represents the allowance for doubtful accounts (in thousands):

	December 31,
	2016			2015			2014
Balance, beginning of year	$	2,877		$	3,693		$	3,411
Changes to provision	(757		)	(816		)	282
Balance, end of year	$	2,120		$	2,877		$	3,693

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Recent Accounting Pronouncements

The following table provides a brief description of recent accounting pronouncements that could have a material effect on our financial statements:

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have been adopted
ASU No. 2014-15, "Presentation of Financial Statements - Going Concern"	The standard requires management to evaluate whether there are conditions and events that raise substantial doubt about an entity's ability to continue as a going concern. Early adoption is permitted.	December 31, 2016	The implementation of this new guidance did not have a material impact on the consolidated financial statements.

Schedule of New Accounting Pronouncements Not yet Adopted

Standards that have not been adopted
Accounting Standards Update (ASU) No. 2017-04, "Simplifying the Accounting for Goodwill Impairment"	The standard removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 requires prospective application. Early adoption is permitted for any impairment tests performed after January 1, 2017.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on the consolidated financial statements.
ASU No. 2017-01, "Business Combinations" (Topic 805): Clarifying the Definition of a Business	This standard provides guidance to assist entities with evaluating when a set of transferred assets and activities is a business. ASU 2017-01 requires prospective application.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-16, "Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory"	The standard requires the recognition of the tax effects of an intra-entity asset transfers in the period in which the transfer takes place. The new guidance does not apply to intra-entity transfers of inventory. ASU No. 2016-16 requires a modified retrospective approach. Early adoption is permitted.	January 1, 2018	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments"	The standard clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. The new guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. ASU No. 2016-15 requires retrospective application. Early adoption is permitted.	January 1, 2018	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.

Standard	Description	Date of Adoption	Effect on the financial statements and other significant matters
Standards that have not been adopted
ASU No. 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments"	This standard requires measurement and recognition of expected credit losses for financial assets held. ASU No. 2016-13 requires modified retrospective application. Early adoption is permitted.	January 1, 2020	The Company believes that the implementation of this new guidance will not have a material impact on it consolidated financial statements.
ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting"	This standard simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeitures and classification of related amounts within the statement of cash flows. Early adoption is permitted.	January 1, 2017	This standard requires excess tax benefits or deficiencies, relating to the vesting of restricted stock unit awards or the exercise of stock options, to be reflected as a component of the tax rate whereas they were previously recognized as equity. This may cause volatility to its effective tax rate as outstanding stock options are exercised or restricted stock awards vest. Additionally, our Consolidated Statements of Cash Flows will include excess tax benefits as an operating activity.
ASU No. 2016-02, "Leases" (Topic 842)	This standard requires lessees to recognize a lease liability and a right-of-use asset for all leases (with the exception of short-term leases) at the commencement date. ASU 2016-02 requires a modified retrospective application. Early adoption is permitted.	January 1, 2019	The Company is evaluating the effect of this new standard on its financial statements and related disclosures.
ASU No. 2014-09, "Revenue from Contracts with Customers" (Topic 606)	This standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 requires retrospective application.	January 1, 2018	The Company has performed an initial evaluation of this standard and its impact on the financial statements. This included tasks such as identifying contracts, identifying performance obligations and reviewing the applicable revenue streams. In this review, nothing has been identified that would require a change in the current accounting for revenue. The Company will continue to review these new requirements prior to implementation which is expected under the modified retrospective method.

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Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of Earnings Per Share

The table below reconciles the Company’s earnings per share (in thousands, except for per share data):

	Year Ended December 31,
	2016			2015		2014
Income (loss) from continuing operations	$	(63,846	)	$	66,821	$	87,907
Income from discontinued operations, net of tax (1)	—			—		618
Net income (loss)	$	(63,846	)	$	66,821	$	88,525
Weighted average number of shares of common stock outstanding	36,248			35,755		36,172
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	—			547		520
Weighted average number of dilutive shares of common stock outstanding	36,248			36,302		36,692
Earnings (loss) per common share:
Basic earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.87	$	2.43
Basic earnings per common share from discontinued operations	—			—		0.02
Basic earnings (loss) per common share	$	(1.76	)	$	1.87	$	2.45
Diluted earnings (loss) per common share from continuing operations	$	(1.76	)	$	1.84	$	2.40
Diluted earnings per common share from discontinued operations	—			—		0.01
Diluted earnings (loss) per common share	$	(1.76	)	$	1.84	$	2.41

⁽¹⁾  On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

⁽²⁾  Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

⁽³⁾  For the years ended December 31, 2016, 2015 and 2014, the 2019 convertible senior notes issued in August 2012 were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of our 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation. See Note 6 for further information.

⁽⁴⁾  Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 8 for further information regarding certain of the Company’s restricted stock unit awards.

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	December 31,
	2016			2015
Offshore supply vessels and multi-purpose support vessels	$	2,825,389		$	2,409,221
Non-vessel related property, plant and equipment	132,320			132,034
Less: Accumulated depreciation	(539,561		)	(452,134		)
	2,418,148			2,089,121
Construction in progress	160,240			485,540
	$	2,578,388		$	2,574,661

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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Outstanding Long-Term Debt

As of the dates indicated below, the Company had the following outstanding long-term debt (in thousands):

	December 31,
	2016		2015
5.875% senior notes due 2020, net of deferred financing costs of $3,025 and $3,944	$	371,975	$	371,056
5.000% senior notes due 2021, net of deferred financing costs of $4,111 and $5,080	445,889		444,920
1.500% convertible senior notes due 2019, net of original issue discount of $31,093 and $41,600 and deferred financing costs of $3,061 and $4,095	265,846		254,305
Revolving credit facility due 2020	—		—
	$	1,083,710	$	1,070,281

The table below summarizes the Company's cash interest payments (in thousands):

	Semi-Annual Cash Interest Payment		Payment Dates
5.875% senior notes due 2020	$	11,000	April 1 and October 1
5.000% senior notes due 2021	11,300		March 1 and September 1
1.500% convertible senior notes due 2019	2,300		March 1 and September 1

Annual Maturities of Debt

Annual maturities of debt, excluding the potential effects of conditions discussed in Convertible Senior Notes, during each year ending December 31, are as follows (in thousands):

2017	$	—
2018	—
2019	300,000
2020	375,000
2021	450,000
Thereafter	—
	$	1,125,000

Schedule of Face Value, Carrying Value and Fair Value [Line Items]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

As of the dates indicated below, the Company had the following face values, carrying values and fair values (in thousands):

	December 31, 2016						December 31, 2015
	Face Value		Carrying Value		Fair Value		Face Value		Carrying Value		Fair Value
5.875% senior notes due 2020	$	375,000	$	371,975	$	270,938	$	375,000	$	371,056	$	257,813
5.000% senior notes due 2021	450,000		445,889		301,343		450,000		444,920		308,250
1.500% convertible senior notes due 2019	300,000		265,846		216,195		300,000		254,305		170,340
	$	1,125,000	$	1,083,710	$	788,476	$	1,125,000	$	1,070,281	$	736,403

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Financial Impact of Stock-Based Compensation Expense Charges

The financial impact of stock-based compensation expense related to the Company’s incentive compensation plan on its operating results are reflected in the table below (in thousands, except for per share data):

	Year Ended December 31,
	2016		2015		2014
Income before taxes	$	9,983	$	10,293	$	10,324
Net income	$	5,829	$	6,454	$	6,471
Earnings per common share:
Basic	$	0.16	$	0.18	$	0.18
Diluted	$	0.16	$	0.18	$	0.18

Summary of Stock Option Activity

The following table represents the Company’s stock option activity for the year ended December 31, 2015 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2015	345		$	27.98	3.7	$	59
Grants	—		—		—	—
Exercised	(1	)	22.28		n/a	2
Forfeited or expired	(40	)	27.27		n/a	n/a
Options outstanding at December 31, 2015	304		$	28.11	3.2	$	—
Exercisable options outstanding at December 31, 2015	304		$	28.11	3.2	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2016 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2016	304		$	28.11	3.2	$	—
Grants	—		—		—	—
Exercised	—		—		—	—
Forfeited or expired	(119	)	33.15		n/a	n/a
Options outstanding at December 31, 2016	185		$	24.86	4.1	$	—
Exercisable options outstanding at December 31, 2016	185		$	24.86	4.1	$	—

The following table represents the Company’s stock option activity for the year ended December 31, 2014 (in thousands, except per share data and years):

	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2014	405		$	27.16	4.2	$	8,951
Grants	—		—		—	—
Exercised	(60	)	22.49		n/a	684
Forfeited or expired	—		—		—	—
Options outstanding at December 31, 2014	345		$	27.98	3.7	$	59
Exercisable options outstanding at December 31, 2014	345		$	27.98	3.7	$	59

Summary of Restricted Stock Award Activity

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2016	726		$	30.12
Granted during the period	537		6.44
Change in estimated payout of performance unit awards(1)	(95	)	27.52
Cancellations during the period	—		—
Vested	(348	)	23.50
Outstanding, as of December 31, 2016	820		$	17.72

⁽¹⁾    Annually the Company reviews the performance compared to pre-determined targets for outstanding performance unit awards. Based on current projections, the Company may increase or decrease the anticipated payout based on its historical operating results and near-term projections.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2014	570		$	31.61
Granted during the period(1)	274		42.61
Cancellations during the period	—		—
Vested	(254	)	30.68
Outstanding, as of December 31, 2014	590		$	37.13

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

The following table summarizes the equity-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share
Restricted stock unit awards:
Restricted stock unit awards as of January 1, 2015	590		$	37.13
Granted during the period(1)	479		21.40
Cancellations during the period	(104	)	21.84
Vested	(239	)	33.60
Outstanding, as of December 31, 2015	726		$	30.12

⁽¹⁾  Includes the base share awards for time-based awards. Includes the full amount of both base and bonus share awards for performance-based awards granted during the period, which represents up to 150% of the aggregate total of the base share awards.

Schedule of Other Share-based Compensation, Activity [Table Text Block]

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2015 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2015	153		$	38.43
Granted during the period	47		21.84
Cancellations during the period	(1	)	30.87
Vested	(117	)	37.25
Outstanding, as of December 31, 2015	82		$	30.61

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2014 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2014	139		$	37.25
Granted during the period	35		43.00
Cancellations during the period	(3	)	39.14
Vested	(18	)	37.88
Outstanding, as of December 31, 2014	153		$	38.43

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

The following table summarizes the cash-settled restricted stock unit awards activity during the year ended December 31, 2016 (in thousands, except per share data):

	Number of Shares		Weighted Avg. Fair Value Per Share(1)
Cash-Settled restricted stock unit awards:
Cash-settled restricted stock unit awards as of January 1, 2016	82		$	30.61
Granted during the period(2)	991		6.14
Cancellations during the period	(5	)	19.05
Vested	(15	)	34.32
Outstanding, as of December 31, 2016	1,053		$	7.60

⁽¹⁾  The weighted average fair value per share is determined by the stock price on the date of grant for time-based shares.

⁽²⁾  Includes only the base shares awarded for both time-based and performance based awards. The performance-based awards have the potential to vest at up to 150% of the aggregate total of the base share awards.

Summary of Weighted Average Assumptions and Fair Value of Options under ESPP

The fair value of the employees’ stock purchase rights granted under the ESPP was estimated using the Black-Scholes model with the following assumptions for the years ended December 31, 2016 and 2015:

	2016			2015
Dividend yield	—		%	—		%
Expected volatility	91.6		%	61.3		%
Risk-free interest rate	0.5		%	0.3		%
Expected term (months)	6			6
Weighted-average grant-date fair value per share	$	3.14		$	4.86

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Components of Long Term Deferred Tax Liabilities Net

The net long-term deferred tax liabilities in the accompanying consolidated balance sheets include the following components (in thousands):

	Year Ended December 31,
	2016			2015			2014
Deferred tax liabilities:
Fixed assets	$	490,221		$	472,817		$	489,060
Deferred charges and other liabilities	10,908			11,317			18,013
Total deferred tax liabilities	501,129			484,134			507,073
Deferred tax assets:
Net operating loss carryforwards	(111,147		)	(52,374		)	(116,676		)
Allowance for doubtful accounts	(763		)	(1,036		)	(1,330		)
Stock-based compensation expense	(4,033		)	(4,830		)	(4,246		)
Alternative minimum tax credit carryforward	(20,863		)	(20,863		)	(20,863		)
Foreign tax credit carryforward	(17,554		)	(17,972		)	(12,332		)
Other	(6,044		)	(5,440		)	(5,676		)
Total deferred tax assets	(160,404		)	(102,515		)	(161,123		)
Valuation allowance	2,295			—			1,011
Total deferred tax liabilities, net	$	343,020		$	381,619		$	346,961

Components of Income Tax Expenses

The components of the income tax expense follow (in thousands):

	Year Ended December 31,
	2016			2015		2014
Current tax expense (benefit):
U.S.	$	709		$	—	$	—
Foreign	(257		)	5,671		1,927
Total current tax expense	452			5,671		1,927
Deferred tax expense:
U.S.	(45,958		)	34,086		50,440
Total tax expense (benefit)	$	(45,506	)	$	39,757	$	52,367

Income (Loss) Before Income Taxes Based on Jurisdiction Earned

Income from continuing operations before income taxes, based on jurisdiction earned, was as follows (in thousands):

	Year Ended December 31,
	2016			2015		2014
U.S.	$	(93,704	)	$	65,894	$	105,066
Foreign	(15,648		)	40,684		35,208
Total income (loss) from continuing operations before income taxes	$	(109,352	)	$	106,578	$	140,274

Reconciliation of Difference Between Company's Income Tax Provision Calculated at Federal Statutory Rate and Actual Income Tax Provision

The following table reconciles the difference between the Company’s income tax provision calculated at the federal statutory rate of 35% and the actual income tax provision (in thousands):

	Year Ended December 31,
	2016			2015			2014
Statutory rate	$	(38,274	)	$	37,302		$	49,096
State taxes, net	(1,094		)	1,066			1,403
Non-deductible expense	1,070			1,440			1,927
Valuation allowance	2,295			(1,011		)	99
Income excluded from U.S. taxable income	(9,478		)	—			—
Foreign taxes and other	(25		)	960			(158		)
	$	(45,506	)	$	39,757		$	52,367

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Future Minimum Payments Under Noncancelable Leases

Future minimum payments under noncancelable leases for years subsequent to 2016 are as follows (in thousands): 

Year Ended December 31,
2017	$	2,826
2018	2,377
2019	2,409
2020	2,456
2021	2,524
Thereafter	24,662
Total	$	37,254

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Deferred Charges (Tables)

12 Months Ended

Dec. 31, 2016

Deferred Charges

Deferred charges include the following (in thousands):

	Year Ended December 31,
	2016		2015
Deferred drydocking costs, net of accumulated amortization of $34,313 and $41,784 respectively	$	13,808	$	29,228
Prepaid lease expense, net of amortization of $1,700 and $1,542, respectively	2,688		2,847
Revolving credit facility deferred financing costs, net of accumulated amortization of $349 and $4,070 respectively	2,581		3,198
Total	$	19,077	$	35,273

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Other Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Other accrued liabilities include the following (in thousands):

	Year Ended December 31,
	2016		2015
Accrued lease expense	$	4,763	$	4,339
Deferred revenue	2,245		5,734
Current taxes payable	215		3,958
Other	2,787		9,581
Total	$	10,010	$	23,612

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Major Customers (Tables)

12 Months Ended

Dec. 31, 2016

Revenues from Customer Exceeding 10%

In the years ended December 31, 2016, 2015, and 2014, revenues from the following customers represent 10% or more of consolidated revenues:

	Year Ended December 31,
	2016			2015			2014
Customer A	21	%		20	%		14	%
Customer B	15	%		n/a		(1)	n/a		(1)
Customer C	13	%		n/a		(1)	n/a		(1)
Customer D	n/a		(1)	10	%		n/a		(1)

⁽¹⁾  Customers represent less than 10% of consolidated revenue in each such year.

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2016

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Discontinued Operations, Income Statement and Balance Sheet

Summarized results of the Downstream segment from discontinued operations are as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Revenue	$	—	$	—	$	12
Gain on sale of assets	—		—		867
Operating Income	—		—		555
Income before income taxes	—		—		966
Income tax expense	—		—		348
Income from discontinued operations	—		—		618

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Condensed Consolidating Guarantor Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Condensed Balance Sheet

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2016
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	9	$	212,196	$	4,822		$	—		$	217,027
Accounts receivable, net of allowance for doubtful accounts of $2,120	—		30,846		5,704			—			36,550
Other current assets	15		16,176		787			—			16,978
Total current assets	24		259,218		11,313			—			270,555
Property, plant and equipment, net	—		2,449,473		128,915			—			2,578,388
Deferred charges, net	2,581		15,724		772			—			19,077
Intercompany receivable	1,779,872		680,663		107,038			(2,567,573		)	—
Investment in subsidiaries	768,718		8,602		(4,283		)	(773,037		)	—
Other assets	1,744		6,239		2,272			—			10,255
Total assets	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	11,325	$	449		$	—		$	11,774
Accrued interest	14,763		—		—			—			14,763
Accrued payroll and benefits	—		8,104		492			—			8,596
Other accrued liabilities	—		8,463		1,547			—			10,010
Total current liabilities	14,763		27,892		2,488			—			45,143
Long-term debt, net of original issue discount of $31,093 and deferred financing costs of $10,197	1,083,710		—		—			—			1,083,710
Deferred tax liabilities, net	—		337,503		5,517			—			343,020
Intercompany payables	61,715		2,264,900		245,276			(2,571,891		)	—
Other liabilities	—		3,416		(10		)	—			3,406
Total liabilities	1,160,188		2,633,711		253,271			(2,571,891		)	1,475,279
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 36,467 shares issued and outstanding	365		—		—			—			365
Additional paid-in capital	754,394		37,978		4,319			(42,297		)	754,394
Retained earnings	637,992		748,080		(21,658		)	(726,422		)	637,992
Accumulated other comprehensive income	—		150		10,095			—			10,245
Total stockholders’ equity	1,392,751		786,208		(7,244		)	(768,719		)	1,402,996
Total liabilities and stockholders’ equity	$	2,552,939	$	3,419,919	$	246,027		$	(3,340,610	)	$	2,878,275

Condensed Consolidating Balance Sheet

(In thousands, except per share data)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	10	$	252,651	$	7,140		$	—		$	259,801
Accounts receivable, net of allowance for doubtful accounts of $2,877	—		41,963		48,418			821			91,202
Other current assets	12		12,955		66			—			13,033
Total current assets	22		307,569		55,624			821			364,036
Property, plant and equipment, net	—		2,472,367		102,294			—			2,574,661
Deferred charges, net	3,198		56,021		(23,946		)	—			35,273
Intercompany receivable	1,751,046		186,054		59,413			(1,996,513		)	—
Investment in subsidiaries	783,709		8,602		(4,283		)	(788,028		)	—
Other assets	1,743		6,648		2,055			—			10,446
Total assets	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	—	$	34,214	$	1,521		$	7		$	35,742
Accrued interest	14,795		—		—			—			14,795
Accrued payroll and benefits	—		9,913		452			—			10,365
Other accrued liabilities	—		16,989		6,623			—			23,612
Total current liabilities	14,795		61,116		8,596			7			84,514
Long-term debt, net of original issue discount of $41,600 and deferred financing costs of $13,119	1,070,281		—		—			—			1,070,281
Deferred tax liabilities, net	—		381,619		—			—			381,619
Intercompany payables	4,403		1,801,829		193,786			(2,000,018		)	—
Other liabilities	—		1,839		—			—			1,839
Total liabilities	1,089,479		2,246,403		202,382			(2,000,011		)	1,538,253
Stockholders’ equity:
Preferred stock: $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	—		—		—			—			—
Common stock: $0.01 par value; 100,000 shares authorized; 35,985 shares issued and outstanding	360		—		—			—			360
Additional paid-in capital	748,043		37,976		4,319			(42,297		)	748,041
Retained earnings	701,836		752,763		(11,349		)	(741,412		)	701,838
Accumulated other comprehensive income (loss)	—		119		(4,195		)	—			(4,076		)
Total stockholders’ equity	1,450,239		790,858		(11,225		)	(783,709		)	1,446,163
Total liabilities and stockholders’ equity	$	2,539,718	$	3,037,261	$	191,157		$	(2,783,720	)	$	2,984,416

Condensed Income Statement

Condensed Consolidating Statement of Operations

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Revenues	$	—		$	213,563		$	8,707		$	2,029	$	224,299
Costs and expenses:
Operating expenses	—			114,783			14,904			1,971		131,658
Depreciation	—			88,443			4,628			—		93,071
Amortization	—			19,024			1,461			—		20,485
General and administrative expenses	184			39,479			3,637			58		43,358
	184			261,729			24,630			2,029		288,572
Gain on sale of assets	—			53			1			—		54
Operating loss	(184		)	(48,113		)	(15,922		)	—		(64,219		)
Other income (expense):
Interest income	—			984			506			—		1,490
Interest expense	(48,673		)	—			(2		)	—		(48,675		)
Equity in earnings (losses) of consolidated subsidiaries	(14,989		)	—			—			14,989		—
Other income (expense), net	—			(2,272		)	4,324			—		2,052
	(63,662		)	(1,288		)	4,828			14,989		(45,133		)
Income (loss) before income taxes	(63,846		)	(49,401		)	(11,094		)	14,989		(109,352		)
Income tax benefit	—			(44,721		)	(785		)	—		(45,506		)
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)

Condensed Consolidating Statement of Operations

(In thousands)

	Year ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Revenues	$	—		$	426,419		$	50,952		$	(1,301	)	$	476,070
Costs and expenses:
Operating expenses	—			178,748			41,514			(1,002		)	219,260
Depreciation	—			81,522			1,044			—			82,566
Amortization	—			25,782			681			—			26,463
General and administrative expenses	189			44,398			3,861			(151		)	48,297
	189			330,450			47,100			(1,153		)	376,586
Gain on sale of assets	—			44,060			—			—			44,060
Operating income (loss)	(189		)	140,029			3,852			(148		)	143,544
Other income (expense):
Interest income	—			1,125			400			—			1,525
Interest expense	(39,460		)	—			(36		)	—			(39,496		)
Equity in earnings (losses) of consolidated subsidiaries	106,798			—			—			(106,798		)	—
Other income (expense), net	—			(4,053		)	5,238			(180		)	1,005
	67,338			(2,928		)	5,602			(106,978		)	(36,966		)
Income (loss) before income taxes	67,149			137,101			9,454			(107,126		)	106,578
Income tax expense	—			35,194			4,563			—			39,757
Net income (loss)	$	67,149		$	101,907		$	4,891		$	(107,126	)	$	66,821

Condensed Statement of Comprehensive Income

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
Net income (loss)	$	(63,846	)	$	(4,680	)	$	(10,309	)	$	14,989	$	(63,846	)
Other comprehensive income:
Foreign currency translation gain	—			31			14,290			—		14,321
Total comprehensive income (loss)	$	(63,846	)	$	(4,649	)	$	3,981		$	14,989	$	(49,525	)

Condensed Consolidating Statements of Comprehensive Income

(In thousands)

	Year Ended December 31, 2015
	Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating			Consolidated
Net income (loss)	$	67,149	$	101,907		$	4,891		$	(107,126	)	$	66,821
Other comprehensive income:
Foreign currency translation loss	—		(81		)	(3,093		)	—			(3,174		)
Total comprehensive income (loss)	$	67,149	$	101,826		$	1,798		$	(107,126	)	$	63,647

Condensed Cash Flow Statement

Condensed Consolidating Statements of Cash Flows

(In thousands)

	Year Ended December 31, 2015
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(1,029	)	$	109,987		$	106,885		$	—	$	215,843
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(120,767		)	(69,303		)	—		(190,070		)
Net proceeds from sale of assets	—			152,000			—			—		152,000
Vessel capital expenditures	—			(55,724		)	(31,068		)	—		(86,792		)
Non-vessel capital expenditures	—			(16,211		)	(276		)	—		(16,487		)
Net cash used in investing activities	—			(40,702		)	(100,647		)	—		(141,349		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(2,089		)	—			—			—		(2,089		)
Net cash proceeds from other shares issued	3,112			—			—			—		3,112
Net cash provided by financing activities	1,023			—			—			—		1,023
Effects of exchange rate changes on cash	—			(81		)	(758		)	—		(839		)
Net increase (decrease) in cash and cash equivalents	(6		)	69,204			5,480			—		74,678
Cash and cash equivalents at beginning of period	16			183,447			1,660			—		185,123
Cash and cash equivalents at end of period	$	10		$	252,651		$	7,140		$	—	$	259,801
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,492		$	—		$	—		$	—	$	50,492
Cash paid for income taxes	$	—		$	582		$	4,226		$	—	$	4,808

	Year Ended December 31, 2016
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$	(199	)	$	55,677		$	(2,428	)	$	—	$	53,050
CASH FLOWS FROM INVESTING ACTIVITIES:
Costs incurred for OSV newbuild program #5	—			(76,615		)	338			—		(76,277		)
Net proceeds from sale of assets	—			523			1			—		524
Vessel capital expenditures	—			(19,604		)	(1,085		)	—		(20,689		)
Non-vessel capital expenditures	—			(467		)	(102		)	—		(569		)
Net cash used in investing activities	—			(96,163		)	(848		)	—		(97,011		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Deferred financing costs	(1,102		)	—			—			—		(1,102		)
Net cash proceeds from other shares issued	1,300			—			—			—		1,300
Net cash provided by financing activities	198			—			—			—		198
Effects of exchange rate changes on cash	—			31			958			—		989
Net decrease in cash and cash equivalents	(1		)	(40,455		)	(2,318		)	—		(42,774		)
Cash and cash equivalents at beginning of period	10			252,651			7,140			—		259,801
Cash and cash equivalents at end of period	$	9		$	212,196		$	4,822		$	—	$	217,027
SUPPLEMENTAL DISCLOSURES OF CASH FLOW ACTIVITIES:
Cash paid for interest	$	50,152		$	—		$	—		$	—	$	50,152
Cash paid for income taxes	$	—		$	1,292		$	2,440		$	—	$	3,732

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Supplemental Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Unaudited Quarterly Financial Data

The following table contains selected unaudited quarterly financial data from the consolidated statements of operations for each quarter of fiscal years 2016 and 2015. The operating results for any quarter are not necessarily indicative of results for any future period.

	Quarter Ended
	Mar 31			Jun 30			Sep 30			Dec 31
Fiscal Year 2016(1)(2)
Revenues	$	76,820		$	53,673		$	51,927		$	41,879
Operating loss	(780		)	(21,510		)	(14,445		)	(27,484		)
Net loss	(7,514		)	(20,586		)	(16,503		)	(19,243		)
Earnings (loss) per common share:
Basic loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Diluted loss per common share	$	(0.21	)	$	(0.57	)	$	(0.45	)	$	(0.53	)
Fiscal Year 2015(1)(2)
Revenues	$	134,624		$	136,446		$	116,281		$	88,719
Operating income(3)	66,898			39,355			32,809			4,482
Net income (loss)	35,853			19,215			14,424			(2,671		)
Earnings (loss) per common share:
Basic earnings (loss) per common share	$	1.01		$	0.54		$	0.40		$	(0.07	)
Diluted earnings (loss) per common share	$	0.99		$	0.53		$	0.40		$	(0.07	)

⁽¹⁾  The sum of the four quarters may not equal annual results due to rounding.

⁽²⁾  Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

⁽³⁾  During the first quarter of 2015, the Company closed on the sale of three 250EDF class OSVs that were previously chartered to the U.S Navy for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). During the third quarter of 2015, the Company closed on the sale of one 250EDF class OSV that was previously chartered to the U.S Navy for cash consideration of $38.0 million. The sale resulted in a pre-tax gain of approximately $11.0 million ($6.7 million after-tax or $0.19 per diluted share). See Note 5 for further discussion.

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Summary of Significant Accounting Policies - Estimated Useful Lives by Classification (Detail)	12 Months Ended
	Dec. 31, 2016
Offshore Supply Vessels
Significant Accounting Policies [Line Items]
Estimated useful life	25 years
Multi Purpose Support Vessel
Significant Accounting Policies [Line Items]
Estimated useful life	25 years
Non-vessel related property, plant and equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Non-vessel related property, plant and equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life	28 years

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		12 Months Ended
	Dec. 31, 2016 mo customer	Dec. 31, 2016 USD ($) mo	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Significant Accounting Policies [Line Items]
Number of Customers | customer	1
Amortization period for deferred charges | mo	30	30
Valuation Allowance, Deferred Tax Asset, Change in Amount | $		$ 2,295	$ (1,011)	$ 99	$ 912
Maximum
Significant Accounting Policies [Line Items]
Salvage values for marine equipment	25.00%	25.00%
Other Capitalized Property Plant and Equipment [Member] | Minimum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		3 years
Other Capitalized Property Plant and Equipment [Member] | Maximum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		28 years
Accounts Receivable [Member] | Customer E [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	14.00%

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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Provision for Doubtful Accounts	$ (757)	$ (816)	$ 282
Balance, beginning of year	2,877	3,693	3,411
Balance, end of year	$ 2,120	$ 2,877	$ 3,693

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Earnings (Loss) Per Share - Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2016	[3],[4]	Sep. 30, 2016	[3],[4]	Jun. 30, 2016	[3],[4]	Mar. 31, 2016	[3],[4]	Dec. 31, 2015	[4]	Sep. 30, 2015	[4]	Jun. 30, 2015	[4]	Mar. 31, 2015	[4]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations																		$ (63,846)	$ 66,821	$ 87,907	[1]
Income from discontinued operations, net of tax (1)	[2]																	0	0	618
Net income (loss)		$ (19,243)		$ (16,503)		$ (20,586)		$ (7,514)		$ (2,671)		$ 14,424		$ 19,215		$ 35,853		$ (63,846)	$ 66,821	$ 88,525
Weighted average number of shares of common stock outstanding																		36,248,000	35,755,000	36,172,000
Add: Net effect of dilutive stock options and unvested restricted stock (2)(3)(4)	[5],[6]																	0	547,000	520,000
Weighted average number of dilutive shares of common stock outstanding																		36,248,000	36,302,000	36,692,000
Basic earnings (loss) per common share from continuing operations																		$ (1.76)	$ 1.87	$ 2.43
Basic earnings per common share from discontinued operations																		0.00	0.00	0.02
Basic earnings (loss) per common share		$ (0.53)		$ (0.45)		$ (0.57)		$ (0.21)		$ (0.07)		$ 0.40		$ 0.54		$ 1.01		(1.76)	1.87	2.45
Diluted earnings (loss) per common share from continuing operations																		(1.76)	1.84	2.40
Diluted earnings per common share from discontinued operations																		0.00	0.00	0.01
Diluted earnings (loss) per common share		$ (0.53)		$ (0.45)		$ (0.57)		$ (0.21)		$ (0.07)		$ 0.40		$ 0.53		$ 0.99		$ (1.76)	$ 1.84	$ 2.41
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from the calculation of diluted earnings per share																		975	322	0

[1] On August 29, 2013, the Company closed the sale of its Downstream segment. See Note 14 for further discussion of this transaction.

[2] Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

[3] Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

[4] The sum of the four quarters may not equal annual results due to rounding.

[5] Dilutive unvested restricted stock units are expected to fluctuate from quarter to quarter depending on the Company’s performance compared to a predetermined set of performance criteria. See Note 8 for further information regarding certain of the Company’s restricted stock unit awards.

[6] For the years ended December 31, 2016, 2015 and 2014, the 2019 convertible senior notes issued in August 2012 were not dilutive, as the average price of the Company’s stock was less than the effective conversion price of such notes. It is the Company's stated intention to redeem the principal amount of our 2019 convertible senior notes in cash and the Company has used the treasury method for determining potential dilution in the diluted earnings per share computation. See Note 6 for further information.

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Defined Contribution Plan - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) yr	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Minimum age to be eligible for participation | yr	18
Period of service to be eligible for participation	3 months
Percentage of earnings that can be deferred	60.00%
Employer contribution | $	$ 0	$ 0	$ 6,000,000

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Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (539,561)	$ (452,134)
Property Plant And Equipment Excluding Construction In Progress Net	2,418,148	2,089,121
Construction in progress	160,240	485,540
Property, plant and equipment, net	2,578,388	2,574,661
Offshore supply vessels and multi-purpose support vessels
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	2,825,389	2,409,221
Non-vessel related property, plant and equipment
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 132,320	$ 132,034

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Property, Plant and Equipment - Additional Information (Detail)				1 Months Ended	12 Months Ended
	Feb. 17, 2016 Vessel	Aug. 28, 2015 USD ($) Vessel $ / shares	Feb. 27, 2015 USD ($) Vessel $ / shares	Nov. 30, 2011 Shipyard Vessel	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($) Vessel	Dec. 31, 2015 USD ($) Vessel $ / shares	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Aggregate cost of OSV newbuild program excluding construction period interest | $						$ 1,335,000,000
Cost incurred on OSV newbuild program | $						$ 1,264,000,000
Percentage of total project cost						94.70%
NumberofVesselsSold | Vessel		1	3				4
Proceeds from Sale of Other Property, Plant, and Equipment | $		$ 38,000,000	$ 114,000,000				$ 152,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | $		11,000,000	33,100,000			$ 54,000	44,060,000	$ 822,000
Gain (Loss) on Disposition of Assets | $		$ 6,700,000	$ 20,700,000				$ 27,600,000
Gain (Loss) on Disposition of Assets, net of tax per share | $ / shares		$ 0.19	$ 0.57				$ 0.76
Newbuild program 5
Property, Plant and Equipment [Line Items]
Number Of Construction Shipyards, Domestic | Shipyard				3
Number of Vessels Placed in Service | Vessel						22
Aggregate cost of OSV newbuild program excluding construction period interest | $						$ 1,335,000,000
Cost incurred on OSV newbuild program | $						$ 1,264,000,000
Percentage of total project cost						94.70%
Newbuild program 5 | Subsequent Event
Property, Plant and Equipment [Line Items]
Estimated Construction Cost, Year Five | $					$ 43,300,000
Newbuild program 5 | Offshore Supply Vessel Class 300
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel				4
Newbuild program 5 | Offshore Supply Vessel Class 310
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel				5
Newbuild program 5 | Offshore Supply Vessel Class 320
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel				10
Newbuild program 5 | Multi Purpose Supply Vessel Class 310
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel	2			3		4
Newbuild program 5 | Multi Purpose Support Vessel
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel				3
Newbuild program 5 | Multi Purpose Supply Vessel Class 400
Property, Plant and Equipment [Line Items]
Number of vessels to be constructed | Vessel	2			2

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Long-Term Debt - Outstanding Long-Term Debt (Detail) - USD ($) $ in Thousands			12 Months Ended
	Apr. 01, 2017	Mar. 01, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 14, 2013	Aug. 13, 2012	Mar. 02, 2012
Debt Instrument [Line Items]
Deferred Finance Costs, Net			$ 10,197	$ 13,119
Senior notes, original issue discount			31,093	41,600
Long-term debt, Excluding Current Maturities			1,083,710	1,070,281
Cash paid for interest			50,152	50,492	$ 50,548
Long-term Debt			1,083,710	1,070,281
Debt Instrument, Face Amount			1,125,000	1,125,000
Debt, Fair Value			$ 788,476	$ 736,403
Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Interest Rate			5.875%	5.875%
Deferred Finance Costs, Net			$ 3,025	$ 3,944
Senior Notes			371,975	371,056
Debt Instrument, Face Amount			375,000	375,000				$ 375,000
Debt, Fair Value			$ 270,938	$ 257,813
Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Interest Rate			5.00%	5.00%
Deferred Finance Costs, Net			$ 4,111	$ 5,080
Senior Notes			445,889	444,920
Debt Instrument, Face Amount			450,000	450,000
Convertible 5.000 Percent Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 450,000
Debt, Fair Value			$ 301,343	$ 308,250
Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Interest Rate			1.50%	1.50%
Deferred Finance Costs, Net			$ 3,061	$ 4,095
Senior notes, original issue discount			31,093	41,600
Senior Notes			265,846	254,305
Debt Instrument, Face Amount			300,000	300,000			$ 300,000
Debt, Fair Value			216,195	170,340
Revolving Credit Facility Due 2016
Debt Instrument [Line Items]
Long-term Line of Credit			$ 0	$ 0
Subsequent Event [Member] | Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Cash paid for interest	$ 11,000
Subsequent Event [Member] | Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Cash paid for interest		$ 11,300
Subsequent Event [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Cash paid for interest		$ 2,300

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Long-Term Debt - Annual Maturities of Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 13, 2012	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2015	Mar. 02, 2012
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,125,000			$ 1,125,000
Convertible One Point Five Percent Senior Notes Due Twenty Nineteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300,000	$ 300,000			300,000
Debt Instrument Maturity Year		2019
Debt Instrument, Maturity Date	Sep. 01, 2019
Senior Notes Five Point Zero Zero Zero Percent Due Twenty Twenty One [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 450,000			450,000
Debt Instrument Maturity Year			2021
Debt Instrument, Maturity Date			Mar. 01, 2021
Senior Notes Five Point Eight Seven Five Percent Due Twenty Twenty [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 375,000			$ 375,000	$ 375,000
Debt Instrument Maturity Year				2020
Debt Instrument, Maturity Date				Apr. 01, 2020

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Long-Term Debt - Additional Information (Details)												1 Months Ended	3 Months Ended	12 Months Ended				42 Months Ended
	Oct. 01, 2016	Sep. 01, 2016	Jul. 28, 2016 USD ($)	Apr. 01, 2016	Mar. 01, 2016	Mar. 14, 2013 USD ($)	Aug. 13, 2012 USD ($) $ / shares	Aug. 13, 2012 USD ($) $ / shares	Apr. 30, 2012 USD ($)	Mar. 16, 2012 USD ($)	Mar. 02, 2012 USD ($)	Aug. 07, 2012 $ / shares	Sep. 30, 2018	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)	Feb. 06, 2020 USD ($)	Jul. 29, 2016 USD ($)
Debt Instrument [Line Items]
Deferred Finance Costs, Net														$ 10,197,000	$ 13,119,000
Debt Instrument, Principal amount														$ 1,125,000,000	1,125,000,000
Loss on early extinguishment of debt																$ (25,800,000)	$ (6,000,000)
Proceeds from Convertible Debt								$ 300,000,000
Debt Instrument, Convertible, Conversion Ratio							18.5718
Conversion Price per Share | $ / shares							$ 53.85	$ 53.85
Market Price Per Share | $ / shares												$ 39.16
Repurchase Price As Percentage Of Principal Amount Of Senior Notes														100.00%
Proceeds from Issuance of Warrants								$ 48,200,000
Purchase Of Convertible Note Hedges								73,000,000
Debt, Fair Value														$ 788,476,000	736,403,000
Capitalized interest, approximate amount														$ 16,700,000	$ 24,700,000	$ 33,200,000
Senior notes 6.125 Percent Due 2014
Debt Instrument [Line Items]
Percentage Of debt outstanding tendered									16.00%	84.00%
Senior Notes 8.000 Percent Due 2017
Debt Instrument [Line Items]
Percentage Of debt outstanding tendered						94.00%
Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Debt Interest Rate														5.875%	5.875%
Deferred Finance Costs, Net														$ 3,025,000	$ 3,944,000
Debt Instrument, Principal amount											$ 375,000,000			375,000,000	375,000,000
Proceeds from Issuance of Senior Long-term Debt											$ 367,400,000
Repayments of Senior Debt						$ 16,600,000			$ 49,500,000	$ 259,900,000
Debt Instrument Maturity Year																	2020
Debt Instrument, Maturity Date																	Apr. 01, 2020
Debt Instrument, Effective Interest Rate																	6.08%
Senior Notes														371,975,000	371,056,000
Debt, Fair Value														$ 270,938,000	$ 257,813,000
Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Debt Interest Rate														5.00%	5.00%
Deferred Finance Costs, Net														$ 4,111,000	$ 5,080,000
Debt Instrument, Principal amount														450,000,000	450,000,000
Debt Instrument Maturity Year																2021
Debt Instrument, Maturity Date																Mar. 01, 2021
Senior Notes														445,889,000	444,920,000
Convertible 5.000 Percent Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Principal amount						450,000,000
Proceeds from Issuance of Senior Long-term Debt						442,400,000
Repayments of Senior Debt						$ 252,700,000
Percentage Of debt outstanding tendered						6.00%
Debt Instrument, Effective Interest Rate						5.21%
Debt, Fair Value														$ 301,343,000	$ 308,250,000
Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Interest Rate														1.50%	1.50%
Deferred Finance Costs, Net														$ 3,061,000	$ 4,095,000
Debt Instrument, Principal amount							$ 300,000,000	300,000,000						$ 300,000,000	300,000,000
Proceeds from Issuance of Senior Long-term Debt								266,000,000
Debt Issuance Costs, Gross							$ 9,300,000	$ 9,300,000
Debt Instrument Maturity Year														2019
Debt Instrument, Maturity Date							Sep. 01, 2019
Debt Instrument, Effective Interest Rate							6.23%	6.23%
Proceeds from Convertible Debt								$ 300,000,000
Discount Rate Used To Determine Liability Fair Value							5.75%	5.75%
Debt Instrument Convertible Carrying Amount Of Liability Component							$ 227,600,000	$ 227,600,000
Debt Instrument, Convertible, Carrying Amount of Equity Component							72,400,000	72,400,000
Debt Instrument Maturity Period														7 years
Decrease In Additional Paid In Capital																	$ 2,200,000
Amortization Of Deferred Financing Costs To Interest Expense														$ 7,100,000
Senior Notes														265,846,000	254,305,000
Debt, Fair Value														216,195,000	$ 170,340,000
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt								290,800,000
Amended Line Of Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral Amount																			$ 400,000,000
PledgedCollateralAsPercentageOfBorrwingBase																			200.00%
Revolving credit facility, Current Borrowing Capacity														$ 200,000,000					$ 200,000,000
Line of Credit Facility, Maximum Borrowing Capacity																			75,000,000
Line of Credit Facility, Covenant, Minimum Liquidity for Prepayment																			150,000,000
Line of Credit Facility, Covenant, Amount Of Liens Permitted To Secure Debt																			$ 15,000,000
Before Amendment [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral Amount			$ 450,000,000
PledgedCollateralAsPercentageOfBorrwingBase			150.00%
Revolving credit facility, Current Borrowing Capacity			$ 300,000,000
Line of Credit Facility, Covenant, Debt to Capitalization, Percent														55.00%
Line of Credit Facility, Covenant, Minimum Liquidity for Prepayment			100,000,000
Line of Credit Facility, Covenant, Amount Of Liens Permitted To Secure Debt			50,000,000
Line of Credit Facility, Covenant, Amount of Cash or Cash Equivalents on Deposit or Unused Availability			$ 20,000,000
Semi Annual Payment First Payment [Member] | Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest payable date				--04-01
Semi Annual Payment First Payment [Member] | Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest payable date					--03-01
Semi Annual Payment First Payment [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest payable date					--03-01
Semi Annual Payment Second Payment [Member] | Senior Notes 5.875 Percent Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest payable date	--10-01
Semi Annual Payment Second Payment [Member] | Senior Notes 5.000 Percent Due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest payable date		--09-01
Semi Annual Payment Second Payment [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest payable date		--09-01
Warrant [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Principal Amount Senior Notes for conversion							1,000	1,000
Debt Instrument Convertible Conversion Warrant Strike Price | $ / shares												$ 68.53
Debt Instrument Convertible Conversion Premium												75.00%
Conversion Condition Two [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Principal Amount Senior Notes for conversion							$ 1,000	$ 1,000
Number Of Trading Days Whether Consecutive Or Not For First Condition Of Convertibility Of Notes							5 days
Number of consecutive trading days used in conversion analysis							10 days
Trading price per 1000 principal amount of notes, percent							95.00%
Conversion Condition One [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument Conversion Circumstance Percentage Stock Price Of Stock Conversion Threshold							135.00%
Number of consecutive trading days used in conversion analysis							30 days
Minimum | Conversion Condition One [Member] | Convertible 1.500 Percent Senior Notes Due 2019
Debt Instrument [Line Items]
Number Of Trading Days Whether Consecutive Or Not For First Condition Of Convertibility Of Notes							20 days
Subsequent Event [Member] | Amended Line Of Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant, Debt to Capitalization, Percent													50.00%
Line of Credit Facility, Covenant, Maximum Cash Balance When Drawn																		$ 50,000,000
Line of Credit Facility, Covenant, Maximum Senior Secured Leverage Ratio																		2
Line of Credit Facility, Covenant, Amount of Cash or Cash Equivalents on Deposit or Unused Availability																		$ 100,000,000

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Stockholders' Equity - Additional Information (Detail)		12 Months Ended
	Jul. 01, 2013	Dec. 31, 2016 Right shares	Dec. 31, 2015 shares	Dec. 31, 2014 USD ($) $ / shares shares	Oct. 28, 2014 USD ($)
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized | shares		5,000,000	5,000,000
Stockholder rights plan for each outstanding share of common stock | Right		1
Business days after public announcement	10 days
Authorized amount | $					$ 150,000,000.0
Stock Repurchased and Retired During Period, Shares | shares		0	0	891,396
Stock repurchased and retired during period,average price paid per share | $ / shares				$ 28.05
Stock repurchased and retired during period, value | $				$ 25,000,000
Stock Repurchase Program, Percent of Shares Repurchased to Shares Outstanding				2.50%
Minimum
Stockholders Equity Note [Line Items]
Percentage of tender offer or exchange for rights to become exercisable		10.00%

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 1,900	$ 600
Number of shares available for grants in future	542,266
Tax deduction (benefit), excess of compensation	$ (1,900)	(600)	$ 300
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	0	0	292
Proceeds from Stock Options Exercised	$ 0	100	1,400
Stock option expiration period from the date of grant				10 years
Stock-based incentive compensation plan, maximum number of shares covered	4,950,000
Share-based Compensation	$ 9,983	10,293	10,324
Vesting Period (in years)				3 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 0	0	$ 100
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period (in years)	3 years
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Thresholds For Potential Shares To Be Issued	0.00%
Vesting Period (in years)	1 year
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Thresholds For Potential Shares To Be Issued	150.00%		150.00%
Vesting Period (in years)	3 years
Time Based Restricted Stock Units (RSU) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period (in years)	1 year
Time Based Restricted Stock Units (RSU) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period (in years)	3 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock based compensation expense	$ 4,600
Unamortized stock based compensation expense, recognition period	1 year 1 month 24 days
Share-based Compensation	$ 6,800	9,300	$ 9,000
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock based compensation expense	$ 5,100
Unamortized stock based compensation expense, recognition period	1 year 9 months 27 days
Share-based Compensation	$ 2,600	(200)	(100)
Vesting Period (in years)	3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangements By Share Based Payment Award Discount From Market Price	15.00%
Number of shares available for grants in future	1,103,731
Stock-based incentive compensation plan, maximum number of shares covered	2,200,000
Share-based Compensation	$ 600	$ 1,200	$ 1,200

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Stock-Based Compensation - Financial Impact of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 9,983	$ 10,293	$ 10,324
Net income	$ 5,829	$ 6,454	$ 6,471
Earnings per common share:
Basic (usd per share)	0.16	0.18	0.18
Diluted (usd per share)	0.16	0.18	0.18

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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Options outstanding at Beginning of Year	304	345	405
Grants	0	0	0
Exercised	0	(1)	(60)
Forfeited or expired	119	40	0
Options outstanding at End of Year	185	304	345	405
Exercisable options outstanding	185	304	345
Weighted Average Exercise Price
Options outstanding at Beginning of Year	$ 28.11	$ 27.98	$ 27.16
Grants	0	0	0
Exercised	0.00	22.28	22.49
Forfeited or expired	33.15	27.27	0.00
Options outstanding at End of Year	24.86	28.11	27.98	$ 27.16
Exercisable options outstanding	$ 24.86	$ 28.11	$ 27.98
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsinPeriodWeightedAverageRemainingContractualTerm(Years)			0 years
Share Based Compensation Arrangement By Share Based Payment Award Nonvested Options Granted In Period Weighted Average Remaining Contractual Term (Years)	0 years	0 years	0 years
Weighted Average Remaining Contractual Term (years)
Options outstanding at Beginning of Year	4 years 1 month 12 days	3 years 2 months 12 days	3 years 8 months 12 days	4 years 2 months 12 days
Options outstanding at End of Year	4 years 1 month 12 days	3 years 2 months 12 days	3 years 8 months 12 days	4 years 2 months 12 days
Exercisable options outstanding	4 years 1 month 12 days	3 years 2 months 12 days	3 years 8 months 6 days
Aggregate Intrinsic Value
Options outstanding at Beginning of Year	$ 0	$ 59	$ 8,951
Grants	0	0	0
Exercised	0	2	684
Options outstanding at End of Year	0	0	59	$ 8,951
Exercisable options outstanding	$ 0	$ 0	$ 59

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Stock-Based Compensation - Summary of Nonvested Stock Option Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsinPeriodWeightedAverageRemainingContractualTerm(Years)			0 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(15)	(117)	(18)
Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 34.32	$ 37.25	$ 37.88
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested	820	726	590	570
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	537	479	274
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	0	(104)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(348)	(239)	(254)
Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 17.72	$ 30.12	$ 37.13	$ 31.61
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	6.44	21.40	42.61
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled And Forfeited In Period Weighted Average Grant Date Fair Value	0.00	21.84	0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 23.50	$ 33.60	$ 30.68

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Stock-Based Compensation - Summary of Restricted Stock Award Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Change In Estimated Payout of Performance Unit Awards	(95)
Vested	(15)	(117)	(18)
Weighted Avg. Fair Value Per Share
Change In Estimated Payout of Performance Unit Awards, Weighted Average Fair Value Per Share	$ 27.52
Vested	$ 34.32	$ 37.25	$ 37.88
Restricted Stock
Number of Shares
Restricted stock awards at Beginning of Year	726	590	570
Granted during the period	537	479	274
Cancellations during the period	0	(104)	0
Vested	(348)	(239)	(254)
Outstanding, at End of Year	820	726	590
Weighted Avg. Fair Value Per Share
Restricted stock awards at Beginning of Year	$ 30.12	$ 37.13	$ 31.61
Granted during the period	6.44	21.40	42.61
Cancellations during the period	0.00	21.84	0.00
Vested	23.50	33.60	30.68
Outstanding, at End of Year	$ 17.72	$ 30.12	$ 37.13
Phantom Share Units (PSUs)
Number of Shares
Restricted stock awards at Beginning of Year	82	153	139
Granted during the period	991	47	35
Cancellations during the period	(5)	(1)	(3)
Outstanding, at End of Year	1,053	82	153
Weighted Avg. Fair Value Per Share
Restricted stock awards at Beginning of Year	$ 30.61	$ 38.43	$ 37.25
Granted during the period	6.14	21.84	43.00
Cancellations during the period	19.05	30.87	39.14
Outstanding, at End of Year	$ 7.60	$ 30.61	$ 38.43

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Stock-Based Compensation - Summary of Weighted Average Assumptions and Fair Value of Options under ESPP (Detail) - Employee Stock Purchase Plan - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	91.60%	61.30%
Risk-free interest rate	0.49%	0.30%
Expected term (months)	6 months	6 months
Weighted-average grant-date fair value per share	$ 3.14	$ 4.86

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Income Taxes - Components of Long Term Deferred Tax Liabilities Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax liabilities:
Fixed assets	$ 490,221	$ 472,817	$ 489,060
Deferred charges and other liabilities	10,908	11,317	18,013
Deferred Tax Liabilities, Gross, Noncurrent	501,129	484,134	507,073
Deferred tax assets:
Net operating loss carryforwards	(111,147)	(52,374)	(116,676)
Allowance for doubtful accounts	(763)	(1,036)	(1,330)
Stock-based compensation expense	(4,033)	(4,830)	(4,246)
Alternative minimum tax credit carryforward	(20,863)	(20,863)	(20,863)
Foreign tax credit carryforward	(17,554)	(17,972)	(12,332)
Other	(6,044)	(5,440)	(5,676)
Total deferred tax assets	(160,404)	(102,515)	(161,123)
Valuation allowance	2,295	0	1,011
Deferred tax liabilities, net
Total deferred tax liabilities	$ 343,020	$ 381,619	$ 346,961

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Federal tax operating loss carryforwards, net	$ 315,200
Foreign tax credit carryforward	16,400
State tax operating loss carryforwards, net	88,500
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 2,295	$ (1,011)	$ 99	$ 912
Federal statutory rate	35.00%
Internal Revenue Service (IRS) | Minimum
Income Taxes [Line Items]
Operating loss carry forward, expiration year	2031
Internal Revenue Service (IRS) | Maximum
Income Taxes [Line Items]
Operating loss carry forward, expiration year	2036
Foreign markets | Minimum
Income Taxes [Line Items]
Tax credit carry forward, expiration year	2019
Foreign markets | Maximum
Income Taxes [Line Items]
Tax credit carry forward, expiration year	2026
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Operating loss carry forward, expiration year	2030
State and Local Jurisdiction | Maximum
Income Taxes [Line Items]
Operating loss carry forward, expiration year	2036

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Income Taxes - Components of Income Tax Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S.	$ 709	$ 0	$ 0
Foreign	(257)	5,671	1,927
Total current tax expense	452	5,671	1,927
U.S.	(45,958)	34,086	50,440
Total tax expense (benefit)	$ (45,506)	$ 39,757	$ 52,367

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Income Taxes - Income (Loss) Before Income Taxes Based on Jurisdiction Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
U.S.	$ (93,704)	$ 65,894	$ 105,066
Foreign	(15,648)	40,684	35,208
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (109,352)	$ 106,578	$ 140,274

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Income Taxes - Reconciliation of Difference Between Company's Income Tax Provision Calculated at Federal Statutory Rate and Actual Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Provision of Income Taxes [Line Items]
Statutory rate	$ (38,274)	$ 37,302	$ 49,096
State taxes, net	(1,094)	1,066	1,403
Non-deductible expense	1,070	1,440	1,927
Valuation Allowance, Deferred Tax Asset, Change in Amount	2,295	(1,011)	99	$ 912
Effective Income Tax Rate Reconciliation Income Excluded from U.S. Taxable Income	(9,478)	0	0
Foreign taxes and other	(25)	960	(158)
Total tax expense (benefit)	$ (45,506)	$ 39,757	$ 52,367

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Commitments and Contingencies - Additional Information (Detail) $ in Millions		1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 17, 2016 Vessel	Nov. 30, 2011 Vessel Shipyard	Jun. 30, 2013	Dec. 31, 2016 USD ($) Vessel Contract	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 Vessel	Jun. 30, 2012 Contract	Dec. 20, 2005 Contract
Commitments and Contingencies Disclosure [Line Items]
Aggregate cost of OSV newbuild program excluding construction period interest				$ 1,335.0
Cost incurred on OSV newbuild program				$ 1,264.0
Percentage of total project cost				94.70%
Operating leases rent expense				$ 4.0	$ 4.1	$ 3.9
Amount owed by ATP, reserves				$ 0.9
Covington facility lease
Commitments and Contingencies Disclosure [Line Items]
Lease expiration date				2025-09
Number of lease renewal options | Contract								3
Operating lease, renewal option term			5 years
Shore-base facility lease
Commitments and Contingencies Disclosure [Line Items]
Number of lease renewal options | Contract									4
New facility lease
Commitments and Contingencies Disclosure [Line Items]
Number of lease renewal options | Contract				3
Operating lease, remaining term				2 years
Importation assessment | Brazil
Commitments and Contingencies Disclosure [Line Items]
Number of Vessels operating in Brazil | Vessel							4
Newbuild program 5
Commitments and Contingencies Disclosure [Line Items]
Number Of Construction Shipyards, Domestic | Shipyard		3
Number of Vessels Placed in Service | Vessel				22
Number Of Vessels | Vessel		24		2
Aggregate cost of OSV newbuild program excluding construction period interest				$ 1,335.0
Cost incurred on OSV newbuild program				$ 1,264.0
Percentage of total project cost				94.70%
Newbuild program 5 | Offshore Supply Vessel Class 300
Commitments and Contingencies Disclosure [Line Items]
Number of vessels to be constructed | Vessel		4
Newbuild program 5 | Offshore Supply Vessel Class 310
Commitments and Contingencies Disclosure [Line Items]
Number of vessels to be constructed | Vessel		5
Newbuild program 5 | Offshore Supply Vessel Class 320
Commitments and Contingencies Disclosure [Line Items]
Number of vessels to be constructed | Vessel		10
Newbuild program 5 | Multi Purpose Supply Vessel Class 310
Commitments and Contingencies Disclosure [Line Items]
Number of vessels to be constructed | Vessel	2	3		4
Newbuild program 5 | Multi Purpose Supply Vessel Class 400
Commitments and Contingencies Disclosure [Line Items]
Number of vessels to be constructed | Vessel	2	2
ATP Oil and Gas, Inc [Member]
Commitments and Contingencies Disclosure [Line Items]
Amount owed by ATP				$ 4.8
Minimum | Importation assessment | Brazil
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Estimate of Possible Loss				0.5
Minimum | Petrobas [Member] | Brazil
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Estimate of Possible Loss				0.5
Maximum | Importation assessment | Brazil
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Estimate of Possible Loss				3.5
Maximum | Petrobas [Member] | Brazil
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Estimate of Possible Loss				$ 3.0

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Commitments and Contingencies - Future Minimum Payments Under Noncancelable Leases (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
2017	$ 2,826
2018	2,377
2019	2,409
2020	2,456
2021	2,524
Thereafter	24,662
Total	$ 37,254

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Deferred Charges (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Deferred drydocking costs, net of accumulated amortization of $41,784 and $38,429 respectively	$ 13,808	$ 29,228
Prepaid lease expense, net of amortization of $1,542 and $1,384 respectively	2,688	2,847
Debt Issuance Costs, Line of Credit Arrangements, Net	2,581	3,198
Total	$ 19,077	$ 35,273

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Deferred Charges (Additional Information) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Deferred financing costs, accumulated amortization	$ 349	$ 4,070
Deferred drydocking costs, accumulated amortization	34,313	41,784
Prepaid lease expense, net of amortization	$ 1,700	$ 1,542

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Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Accrued Rent	$ 4,763	$ 4,339
Deferred Revenue	2,245	5,734
Taxes Payable, Current	215	3,958
Other Accrued Liabilities	2,787	9,581
Other Accrued Liabilities, Current	$ 10,010	$ 23,612

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Major Customers - Revenues from Customer Exceeding 10% (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Customer A
Revenue, Major Customer [Line Items]
Percentage of total revenue by customer	21.00%	20.00%	14.00%
Customer B
Revenue, Major Customer [Line Items]
Percentage of total revenue by customer	15.00%
Customer C
Revenue, Major Customer [Line Items]
Percentage of total revenue by customer	13.00%
Customer D
Revenue, Major Customer [Line Items]
Percentage of total revenue by customer		10.00%

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Discontinued Operations - Income Statement from Discontinued Operations (Details)			12 Months Ended
		Aug. 29, 2013 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) $ / shares
Discontinued Operations and Disposal Groups [Abstract]
Number of Assets excluded from sale		3
Proceeds from Sale of Other Property, Plant and Equipment, Discontinued Operations					$ 1,600,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			$ 0	$ 0	867,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax					$ 600,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Share | $ / shares					$ 0.02
Revenue			0	0	$ 12,000
Operating Income			0	0	555,000
Income before income taxes			0	0	966,000
Income tax expense			0	0	348,000
Income from discontinued operations	[1]		$ 0	$ 0	$ 618,000

[1] Due to a net loss for 2016, the Company excluded from the calculation of loss per share the effect of equity awards representing the rights to acquire 975 shares of common stock for the year ended December 31, 2016. The Company had 322 anti-dilutive stock options for the year ended December 31, 2015. The Company had no anti-dilutive stock options for the year ended December 31, 2014. Stock options are anti-dilutive when the exercise price of the options is greater than the average market price of the common stock for the period or when the results from operations are a net loss.

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Employment Agreements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016
Compensation Plan [Line Items]
Expiration date of employment agreements with certain members of executive management team	Dec. 31, 2019

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Condensed Consolidating Guarantor Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 217,027	$ 259,801	$ 185,123	$ 439,291
Accounts Receivable, Net, Current	36,550	91,202
Other Assets, Current	16,978	13,033
Assets, Current	270,555	364,036
Property, plant and equipment, net	2,578,388	2,574,661
Deferred costs, Noncurrent	19,077	35,273
Due from Related Parties, Noncurrent	0	0
Equity Method Investments	0	0
Other assets, Noncurrent	10,255	10,446
Assets	2,878,275	2,984,416
Accounts payable, Current	11,774	35,742
Interest Payable, Current	14,763	14,795
Employee-related Liabilities, Current	8,596	10,365
Other accrued liabilities, Current	10,010	23,612
Total current liabilities	45,143	84,514
Long-term debt, Excluding Current Maturities	1,083,710	1,070,281
Deferred Tax Liabilities, Net, Noncurrent	343,020	381,619
Due to Related Parties	0	0
Other Liabilities, Noncurrent	3,406	1,839
Liabilities	1,475,279	1,538,253
Preferred stock, Value, Issued	0	0
Common stock, Value, Issued	365	360
Additional paid-in capital	754,394	748,041
Retained earnings (Accumulated Deficit)	637,992	701,838
Accumulated Other Comprehensive Income (Loss), Net of Tax	10,245	(4,076)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,402,996	1,446,163
Liabilities and Equity	2,878,275	2,984,416
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0
Accounts Receivable, Net, Current	0	821
Other Assets, Current	0	0
Assets, Current	0	821
Property, plant and equipment, net	0	0
Deferred costs, Noncurrent	0	0
Due from Related Parties, Noncurrent	(2,567,573)	(1,996,513)
Equity Method Investments	(773,037)	(788,028)
Other assets, Noncurrent	0	0
Assets	(3,340,610)	(2,783,720)
Accounts payable, Current	0	7
Interest Payable, Current	0	0
Employee-related Liabilities, Current	0	0
Other accrued liabilities, Current	0	0
Total current liabilities	0	7
Long-term debt, Excluding Current Maturities	0	0
Deferred Tax Liabilities, Net, Noncurrent	0	0
Due to Related Parties	(2,571,891)	(2,000,018)
Other Liabilities, Noncurrent	0	0
Liabilities	(2,571,891)	(2,000,011)
Preferred stock, Value, Issued	0	0
Common stock, Value, Issued	0	0
Additional paid-in capital	(42,297)	(42,297)
Retained earnings (Accumulated Deficit)	(726,422)	(741,412)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(768,719)	(783,709)
Liabilities and Equity	(3,340,610)	(2,783,720)
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	9	10	16
Accounts Receivable, Net, Current	0	0
Other Assets, Current	15	12
Assets, Current	24	22
Property, plant and equipment, net	0	0
Deferred costs, Noncurrent	2,581	3,198
Due from Related Parties, Noncurrent	1,779,872	1,751,046
Equity Method Investments	768,718	783,709
Other assets, Noncurrent	1,744	1,743
Assets	2,552,939	2,539,718
Accounts payable, Current	0	0
Interest Payable, Current	14,763	14,795
Employee-related Liabilities, Current	0	0
Other accrued liabilities, Current	0	0
Total current liabilities	14,763	14,795
Long-term debt, Excluding Current Maturities	1,083,710	1,070,281
Deferred Tax Liabilities, Net, Noncurrent	0	0
Due to Related Parties	61,715	4,403
Other Liabilities, Noncurrent	0	0
Liabilities	1,160,188	1,089,479
Preferred stock, Value, Issued	0	0
Common stock, Value, Issued	365	360
Additional paid-in capital	754,394	748,043
Retained earnings (Accumulated Deficit)	637,992	701,836
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,392,751	1,450,239
Liabilities and Equity	2,552,939	2,539,718
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	212,196	252,651	183,447
Accounts Receivable, Net, Current	30,846	41,963
Other Assets, Current	16,176	12,955
Assets, Current	259,218	307,569
Property, plant and equipment, net	2,449,473	2,472,367
Deferred costs, Noncurrent	15,724	56,021
Due from Related Parties, Noncurrent	680,663	186,054
Equity Method Investments	8,602	8,602
Other assets, Noncurrent	6,239	6,648
Assets	3,419,919	3,037,261
Accounts payable, Current	11,325	34,214
Interest Payable, Current	0	0
Employee-related Liabilities, Current	8,104	9,913
Other accrued liabilities, Current	8,463	16,989
Total current liabilities	27,892	61,116
Long-term debt, Excluding Current Maturities	0	0
Deferred Tax Liabilities, Net, Noncurrent	337,503	381,619
Due to Related Parties	2,264,900	1,801,829
Other Liabilities, Noncurrent	3,416	1,839
Liabilities	2,633,711	2,246,403
Preferred stock, Value, Issued	0	0
Common stock, Value, Issued	0	0
Additional paid-in capital	37,978	37,976
Retained earnings (Accumulated Deficit)	748,080	752,763
Accumulated Other Comprehensive Income (Loss), Net of Tax	150	119
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	786,208	790,858
Liabilities and Equity	3,419,919	3,037,261
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	4,822	7,140	$ 1,660
Accounts Receivable, Net, Current	5,704	48,418
Other Assets, Current	787	66
Assets, Current	11,313	55,624
Property, plant and equipment, net	128,915	102,294
Deferred costs, Noncurrent	772	(23,946)
Due from Related Parties, Noncurrent	107,038	59,413
Equity Method Investments	(4,283)	(4,283)
Other assets, Noncurrent	2,272	2,055
Assets	246,027	191,157
Accounts payable, Current	449	1,521
Interest Payable, Current	0	0
Employee-related Liabilities, Current	492	452
Other accrued liabilities, Current	1,547	6,623
Total current liabilities	2,488	8,596
Long-term debt, Excluding Current Maturities	0	0
Deferred Tax Liabilities, Net, Noncurrent	5,517	0
Due to Related Parties	245,276	193,786
Other Liabilities, Noncurrent	(10)	0
Liabilities	253,271	202,382
Preferred stock, Value, Issued	0	0
Common stock, Value, Issued	0	0
Additional paid-in capital	4,319	4,319
Retained earnings (Accumulated Deficit)	(21,658)	(11,349)
Accumulated Other Comprehensive Income (Loss), Net of Tax	10,095	(4,195)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,244)	(11,225)
Liabilities and Equity	$ 246,027	$ 191,157

XML

Condensed Consolidating Guarantor Financial Information Condensed Consolidating Statement of Operations (Details) - USD ($)			3 Months Ended																12 Months Ended
	Aug. 28, 2015	Feb. 27, 2015	Dec. 31, 2016	[1],[2]	Sep. 30, 2016	[1],[2]	Jun. 30, 2016	[1],[2]	Mar. 31, 2016	[1],[2]	Dec. 31, 2015	[2]	Sep. 30, 2015	[2]	Jun. 30, 2015	[2]	Mar. 31, 2015	[2]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Revenues			$ 41,879,000		$ 51,927,000		$ 53,673,000		$ 76,820,000		$ 88,719,000		$ 116,281,000		$ 136,446,000		$ 134,624,000		$ 224,299,000	$ 476,070,000	$ 634,793,000
Operating Costs and Expenses																			131,658,000	219,260,000	296,500,000
Depreciation																			93,071,000	82,566,000	71,301,000
Amortization of Deferred Charges																			20,485,000	26,463,000	44,149,000
General and Administrative Expense																			43,358,000	48,297,000	54,245,000
Costs and Expenses																			288,572,000	376,586,000	466,195,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 11,000,000	$ 33,100,000																	54,000	44,060,000	822,000
Operating Income (Loss)			$ (27,484,000)		$ (14,445,000)		$ (21,510,000)		$ (780,000)		$ 4,482,000		$ 32,809,000	[3]	$ 39,355,000		$ 66,898,000	[3]	(64,219,000)	143,544,000	169,420,000
Investment Income, Interest																			1,490,000	1,525,000	1,086,000
Interest Expense																			(48,675,000)	(39,496,000)	(30,733,000)
EquityinEarningsofConsolidatedSubsidiaries																			0	0
Other Nonoperating Income (Expense)																			2,052,000	1,005,000	501,000
Nonoperating Income (Expense)																			(45,133,000)	(36,966,000)	(29,146,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest																			(109,352,000)	106,578,000	140,274,000
Income Tax Expense (benefit)																			(45,506,000)	39,757,000	$ 52,367,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest																			(63,846,000)	66,821,000
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues																			2,029,000	(1,301,000)
Operating Costs and Expenses																			1,971,000	(1,002,000)
Depreciation																			0	0
Amortization of Deferred Charges																			0	0
General and Administrative Expense																			58,000	(151,000)
Costs and Expenses																			2,029,000	(1,153,000)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property																			0	0
Operating Income (Loss)																			0	(148,000)
Investment Income, Interest																			0	0
Interest Expense																			0	0
EquityinEarningsofConsolidatedSubsidiaries																			14,989,000	(106,798,000)
Other Nonoperating Income (Expense)																			0	(180,000)
Nonoperating Income (Expense)																			14,989,000	(106,978,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest																			14,989,000	(107,126,000)
Income Tax Expense (benefit)																			0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest																			14,989,000	(107,126,000)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenues																			0	0
Operating Costs and Expenses																			0	0
Depreciation																			0	0
Amortization of Deferred Charges																			0	0
General and Administrative Expense																			184,000	189,000
Costs and Expenses																			184,000	189,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property																			0	0
Operating Income (Loss)																			(184,000)	(189,000)
Investment Income, Interest																			0	0
Interest Expense																			(48,673,000)	(39,460,000)
EquityinEarningsofConsolidatedSubsidiaries																			(14,989,000)	106,798,000
Other Nonoperating Income (Expense)																			0	0
Nonoperating Income (Expense)																			(63,662,000)	67,338,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest																			(63,846,000)	67,149,000
Income Tax Expense (benefit)																			0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest																			(63,846,000)	67,149,000
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues																			213,563,000	426,419,000
Operating Costs and Expenses																			114,783,000	178,748,000
Depreciation																			88,443,000	81,522,000
Amortization of Deferred Charges																			19,024,000	25,782,000
General and Administrative Expense																			39,479,000	44,398,000
Costs and Expenses																			261,729,000	330,450,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property																			53,000	44,060,000
Operating Income (Loss)																			(48,113,000)	140,029,000
Investment Income, Interest																			984,000	1,125,000
Interest Expense																			0	0
EquityinEarningsofConsolidatedSubsidiaries																			0	0
Other Nonoperating Income (Expense)																			(2,272,000)	(4,053,000)
Nonoperating Income (Expense)																			(1,288,000)	(2,928,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest																			(49,401,000)	137,101,000
Income Tax Expense (benefit)																			(44,721,000)	35,194,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest																			(4,680,000)	101,907,000
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues																			8,707,000	50,952,000
Operating Costs and Expenses																			14,904,000	41,514,000
Depreciation																			4,628,000	1,044,000
Amortization of Deferred Charges																			1,461,000	681,000
General and Administrative Expense																			3,637,000	3,861,000
Costs and Expenses																			24,630,000	47,100,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property																			1,000	0
Operating Income (Loss)																			(15,922,000)	3,852,000
Investment Income, Interest																			506,000	400,000
Interest Expense																			(2,000)	(36,000)
EquityinEarningsofConsolidatedSubsidiaries																			0	0
Other Nonoperating Income (Expense)																			4,324,000	5,238,000
Nonoperating Income (Expense)																			4,828,000	5,602,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest																			(11,094,000)	9,454,000
Income Tax Expense (benefit)																			(785,000)	4,563,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest																			$ (10,309,000)	$ 4,891,000

[1] Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

[2] The sum of the four quarters may not equal annual results due to rounding.

[3] During the first quarter of 2015, the Company closed on the sale of three 250EDF class OSVs that were previously chartered to the U.S Navy for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). During the third quarter of 2015, the Company closed on the sale of one 250EDF class OSV that was previously chartered to the U.S Navy for cash consideration of $38.0 million. The sale resulted in a pre-tax gain of approximately $11.0 million ($6.7 million after-tax or $0.19 per diluted share). See Note 5 for further discussion.

XML

Condensed Consolidating Guarantor Financial Information Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Statement of Comprehensive Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (63,846)	$ 66,821
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment	14,321	(3,174)	$ (107)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(49,525)	63,647	$ 88,418
Consolidation, Eliminations [Member]
Condensed Statement of Comprehensive Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	14,989	(107,126)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	14,989	(107,126)
Parent Company [Member]
Condensed Statement of Comprehensive Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(63,846)	67,149
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(63,846)	67,149
Guarantor Subsidiaries [Member]
Condensed Statement of Comprehensive Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(4,680)	101,907
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment	31	(81)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(4,649)	101,826
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Comprehensive Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(10,309)	4,891
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment	14,290	(3,093)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 3,981	$ 1,798

XML

Condensed Consolidating Guarantor Financial Information Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 53,050	$ 215,843	$ 163,106
Costs Incurred For Offshore Supply Vessels Newbuild Program	(76,277)	(190,070)	(343,989)
Proceeds from Sale of Property, Plant, and Equipment	524	152,000	7,178
Payments to Acquire Property, Plant, and Equipment	(20,689)	(86,792)	(55,089)
Payments to Acquire Other Property, Plant, and Equipment	(569)	(16,487)	(9,615)
Net Cash Provided by (Used in) Investing Activities	(97,011)	(141,349)
Payments of Financing Costs	(1,102)	(2,089)	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	1,300	3,112	5,044
Net Cash Provided by (Used in) Financing Activities	198	1,023
Effect of Exchange Rate on Cash and Cash Equivalents	989	(839)	(107)
Cash and Cash Equivalents, Period Increase (Decrease)	(42,774)	74,678	(254,168)
Cash and cash equivalents, at Carrying Value	217,027	259,801	185,123	$ 439,291
Cash Paid for Interest	50,152	50,492	50,548
Income Taxes Paid	3,732	4,808	5,679
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0
Costs Incurred For Offshore Supply Vessels Newbuild Program	0	0
Proceeds from Sale of Property, Plant, and Equipment	0	0
Payments to Acquire Property, Plant, and Equipment	0	0
Payments to Acquire Other Property, Plant, and Equipment	0	0
Net Cash Provided by (Used in) Investing Activities	0	0
Payments of Financing Costs	0	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Cash and cash equivalents, at Carrying Value	0	0	0
Cash Paid for Interest	0	0
Income Taxes Paid	0	0
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(199)	(1,029)
Costs Incurred For Offshore Supply Vessels Newbuild Program	0	0
Proceeds from Sale of Property, Plant, and Equipment	0	0
Payments to Acquire Property, Plant, and Equipment	0	0
Payments to Acquire Other Property, Plant, and Equipment	0	0
Net Cash Provided by (Used in) Investing Activities	0	0
Payments of Financing Costs	(1,102)	(2,089)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	1,300	3,112
Net Cash Provided by (Used in) Financing Activities	198	1,023
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	(1)	(6)
Cash and cash equivalents, at Carrying Value	9	10	16
Income Taxes Paid	0	0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	55,677	109,987
Costs Incurred For Offshore Supply Vessels Newbuild Program	(76,615)	(120,767)
Proceeds from Sale of Property, Plant, and Equipment	523	152,000
Payments to Acquire Property, Plant, and Equipment	(19,604)	(55,724)
Payments to Acquire Other Property, Plant, and Equipment	(467)	(16,211)
Net Cash Provided by (Used in) Investing Activities	(96,163)	(40,702)
Payments of Financing Costs	0	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Effect of Exchange Rate on Cash and Cash Equivalents	31	(81)
Cash and Cash Equivalents, Period Increase (Decrease)	(40,455)	69,204
Cash and cash equivalents, at Carrying Value	212,196	252,651	183,447
Cash Paid for Interest	0	0
Income Taxes Paid	1,292	582
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(2,428)	106,885
Costs Incurred For Offshore Supply Vessels Newbuild Program	338	(69,303)
Proceeds from Sale of Property, Plant, and Equipment	1	0
Payments to Acquire Property, Plant, and Equipment	(1,085)	(31,068)
Payments to Acquire Other Property, Plant, and Equipment	(102)	(276)
Net Cash Provided by (Used in) Investing Activities	(848)	(100,647)
Payments of Financing Costs	0	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Effect of Exchange Rate on Cash and Cash Equivalents	958	(758)
Cash and Cash Equivalents, Period Increase (Decrease)	(2,318)	5,480
Cash and cash equivalents, at Carrying Value	4,822	7,140	$ 1,660
Income Taxes Paid	$ 2,440	$ 4,226

XML

Supplemental Selected Quarterly Financial Data (Unaudited) - Supplemental Selected Quarterly Financial Data (Unaudited) (Detail) - USD ($)	3 Months Ended																12 Months Ended
	Dec. 31, 2016	[1],[2]	Sep. 30, 2016	[1],[2]	Jun. 30, 2016	[1],[2]	Mar. 31, 2016	[1],[2]	Dec. 31, 2015	[2]	Sep. 30, 2015	[2]	Jun. 30, 2015	[2]	Mar. 31, 2015	[2]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Vessel revenues	$ 41,879,000		$ 51,927,000		$ 53,673,000		$ 76,820,000		$ 88,719,000		$ 116,281,000		$ 136,446,000		$ 134,624,000		$ 224,299,000	$ 476,070,000	$ 634,793,000
Operating Income (Loss)	(27,484,000)		(14,445,000)		(21,510,000)		(780,000)		4,482,000		32,809,000	[3]	39,355,000		66,898,000	[3]	(64,219,000)	143,544,000	169,420,000
Net income (Loss)	$ (19,243,000)		$ (16,503,000)		$ (20,586,000)		$ (7,514,000)		$ (2,671,000)		$ 14,424,000		$ 19,215,000		$ 35,853,000		$ (63,846,000)	$ 66,821,000	$ 88,525,000
Earnings (loss) per common share:
Basic earnings (loss) per common share, in dollars per share	$ (0.53)		$ (0.45)		$ (0.57)		$ (0.21)		$ (0.07)		$ 0.40		$ 0.54		$ 1.01		$ (1.76)	$ 1.87	$ 2.45
Diluted earnings (loss) per common share, in dollars per share	$ (0.53)		$ (0.45)		$ (0.57)		$ (0.21)		$ (0.07)		$ 0.40		$ 0.53		$ 0.99		$ (1.76)	$ 1.84	$ 2.41

[1] Results for the fiscal years 2016 and 2015 were significantly impacted by a drop in oil price, which resulted in reductions in both the Company's dayrates and utilization. In recognition of these weak market conditions, the Company elected to stack OSVs and MPSVs on various dates during fiscal 2016. The Company had an average of 41.3 OSVs and 0.3 MPSVs stacked during the year ended December 31, 2016. The Company had an average of 18.0 OSVs and no MPSVs stacked during fiscal 2015.

[2] The sum of the four quarters may not equal annual results due to rounding.

[3] During the first quarter of 2015, the Company closed on the sale of three 250EDF class OSVs that were previously chartered to the U.S Navy for cash consideration of $114.0 million. The sale resulted in a pre-tax gain of approximately $33.1 million ($20.7 million after-tax or $0.57 per diluted share). During the third quarter of 2015, the Company closed on the sale of one 250EDF class OSV that was previously chartered to the U.S Navy for cash consideration of $38.0 million. The sale resulted in a pre-tax gain of approximately $11.0 million ($6.7 million after-tax or $0.19 per diluted share). See Note 5 for further discussion.

XML

Supplemental Selected Quarterly Financial Data (Unaudited) - Supplemental Selected Quarterly Financial Data (Unaudited) (Narrative) (Detail)			12 Months Ended
	Aug. 28, 2015 USD ($) Vessel $ / shares	Feb. 27, 2015 USD ($) Vessel $ / shares	Dec. 31, 2016 USD ($) Vessel	Dec. 31, 2015 USD ($) Vessel $ / shares	Dec. 31, 2014 USD ($)
Quarterly Financial Information [Line Items]
Number of Vessels Stacked | Vessel			41.3	18.0
Average Number of MPSVs Stacked | Vessel			0.3	0
NumberofVesselsSold | Vessel	1	3		4
Proceeds from Sale of Other Property, Plant, and Equipment | $	$ 38,000,000	$ 114,000,000		$ 152,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | $	11,000,000	33,100,000	$ 54,000	44,060,000	$ 822,000
Gain (Loss) on Disposition of Assets | $	$ 6,700,000	$ 20,700,000		$ 27,600,000
Gain (Loss) on Disposition of Assets, net of tax per share | $ / shares	$ 0.19	$ 0.57		$ 0.76