10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

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

For the fiscal year ended December 31, 2011

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 0-22664

Patterson-UTI Energy, Inc.

(Exact name of registrant as specified in its charter)

Delaware	75-2504748
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

450 Gears Road, Suite 500, Houston, Texas	77067
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code:

(281) 765-7100

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	The Nasdaq Global Select Market

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  þ        or No  ¨

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  ¨        or No  þ

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  þ        No  ¨

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

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 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.  þ

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 definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  þ Accelerated filer  ¨ Non-accelerated filer  ¨ Smaller reporting company  ¨

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

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2011, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $4.8 billion, calculated by reference to the closing price of $31.61 for the common stock on the Nasdaq Global Select Market on that date.

As of February 9, 2012, the registrant had outstanding 155,818,409 shares of common stock, $0.01 par value, its only class of common stock.

Documents incorporated by reference:

Portions of the registrant’s definitive proxy statement for the 2012 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.

DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (this “Report”) and other public filings and press releases by us contain “forward-looking statements” within the meaning of the Securities Act of 1933, as amended (the “Securities Act”), the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the Private Securities Litigation Reform Act of 1995, as amended. These “forward-looking statements” involve risk and uncertainty. These forward-looking statements include, without limitation, statements relating to: liquidity; revenue expectations and backlog; financing of operations; continued volatility of oil and natural gas prices; source and sufficiency of funds required for building new equipment and additional acquisitions (if further opportunities arise); impact of inflation; demand for our services; and other matters. Our forward-looking statements can be identified by the fact that they do not relate strictly to historic or current facts and often use words such as “believes,” “budgeted,” “continue,” “expects,” “estimates,” “project,” “will,” “could,” “may,” “plans,” “intends,” “strategy,” or “anticipates,” or the negative thereof and other words and expressions of similar meaning. The forward-looking statements are based on certain assumptions and analyses we make in light of our experience and our perception of historical trends, current conditions, expected future developments and other factors we believe are appropriate in the circumstances. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we can give no assurance that such expectations will prove to have been correct. Forward-looking statements may be made orally or in writing, including, but not limited to, Management’s Discussion and Analysis of Financial Condition and Results of Operations included in this Report and other sections of our filings with the United States Securities and Exchange Commission (the “SEC”) under the Exchange Act and the Securities Act.

Forward-looking statements are not guarantees of future performance and a variety of factors could cause actual results to differ materially from the anticipated or expected results expressed in or suggested by these forward-looking statements. Factors that might cause or contribute to such differences include, but are not limited to, global economic conditions, volatility in customer spending and in oil and natural gas prices that could adversely affect demand for our services and their associated effect on rates, utilization, margins and planned capital expenditures, excess availability of land drilling rigs and pressure pumping equipment, including as a result of reactivation or construction, adverse industry conditions, adverse credit and equity market conditions, difficulty in integrating acquisitions, shortages of labor, equipment, supplies and materials, weather, loss of key customers, liabilities from operations for which we do not have and receive full indemnification or insurance, governmental regulation and ability to retain management and field personnel. Refer to “Risk Factors” contained in Item 1A of this Report for a more complete discussion of these and other factors that might affect our performance and financial results. You are cautioned not to place undue reliance on any of our forward-looking statements. These forward-looking statements are intended to relay our expectations about the future, and speak only as of the date they are made. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, changes in internal estimates or otherwise, except as required by law.

PART I

Item 1. Business

Available Information

This Report, along with our Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, are available free of charge through our internet website (www.patenergy.com) as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The information contained on our website is not part of this Report or other filings that we make with the SEC. You may read and copy any materials we file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, DC 20549. You may obtain information on the operation of the Public Reference Room by calling the SEC at

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1-800-SEC-0330. The SEC maintains an internet site (www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC.

Overview

We own and operate one of the largest fleets of land-based drilling rigs in the United States. The Company was formed in 1978 and reincorporated in 1993 as a Delaware corporation. Our contract drilling business operates primarily in Texas, New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, Pennsylvania, West Virginia, Ohio and western Canada.

As of December 31, 2011, we had a drilling fleet that consisted of 328 marketable land-based drilling rigs. A drilling rig includes the structure, power source and machinery necessary to cause a drill bit to penetrate the earth to a depth desired by the customer. A drilling rig is considered marketable at a point in time if it is operating or can be made ready to operate without significant capital expenditures. We also have a substantial inventory of drill pipe and drilling rig components.

We provide pressure pumping services to oil and natural gas operators primarily in Texas and the Appalachian Basin. Pressure pumping services consist primarily of well stimulation and cementing for completion of new wells and remedial work on existing wells.

We also own and invest in oil and natural gas assets as a non-operating working interest owner. Our oil and natural gas working interests are located primarily in Texas and New Mexico.

Prior to January 20, 2010, we provided drilling fluids, completion fluids and related services to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, New Mexico, Oklahoma and Louisiana. We sold our drilling and completion fluids services business on January 20, 2010. On October 1, 2010, we acquired the assets and operations of a pressure pumping business and an electric wireline business. The electric wireline business that we acquired was classified as held for sale at December 31, 2010 and sold on January 27, 2011. The results of our drilling and completion fluids services business and our electric wireline business are presented as discontinued operations in this Report.

Industry Segments

Our revenues, operating profits and identifiable assets are primarily attributable to three industry segments:

• contract drilling services,

• pressure pumping services, and

• oil and natural gas exploration and production.

All of our industry segments had operating profits in 2011 and 2010. In 2009, our pressure pumping services and oil and natural gas exploration and production segments had operating profits and our contract drilling services segment had an operating loss.

See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 15 of Notes to Consolidated Financial Statements included as a part of Items 7 and 8, respectively, of this Report for financial information pertaining to these industry segments.

Contract Drilling Operations

General — We market our contract drilling services to major and independent oil and natural gas operators. As of December 31, 2011, we had 328 marketable land-based drilling rigs based in the following regions:

• 64 in west Texas and southeastern New Mexico,

• 73 in north central and east Texas, northern Louisiana and Mississippi,

• 48 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota),

• 62 in south Texas and southern Louisiana,

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• 27 in the Texas panhandle, Oklahoma and Arkansas,

• 34 in the Appalachian Basin, and

• 20 in western Canada.

Our marketable drilling rigs have rated maximum depth capabilities ranging from 5,250 feet to 25,000 feet. Of these drilling rigs, 145 are electric rigs and 183 are mechanical rigs. An electric rig differs from a mechanical rig in that the electric rig converts the diesel power (the sole energy source for a mechanical rig) into electricity to power the rig. We also have a substantial inventory of drill pipe and drilling rig components, which may be used in the activation of additional drilling rigs or as replacement parts for marketable rigs.

Drilling rigs are typically equipped with engines, drawworks, masts, pumps to circulate the drilling fluid, blowout preventers, drill pipe and other related equipment. Over time, components on a drilling rig are replaced or rebuilt. We spend significant funds each year as part of a program to modify, upgrade and maintain our drilling rigs to ensure that our drilling equipment is competitive. We have spent over $1.8 billion during the last three years on capital expenditures to (1) build new land drilling rigs and (2) modify, upgrade and maintain our drilling fleet. During fiscal years 2011, 2010 and 2009, we spent approximately $785 million, $656 million and $395 million, respectively, on these capital expenditures.

Depth and complexity of the well and drill site conditions are the principal factors in determining the specifications of the rig selected for a particular job.

Our contract drilling operations depend on the availability of drill pipe, drill bits, replacement parts and other related rig equipment, fuel and other materials and qualified personnel. Some of these have been in short supply from time to time.

Drilling Contracts — Most of our drilling contracts are with established customers on a competitive bid or negotiated basis. Our drilling contracts are either on a well-to-well basis or a term basis. Well-to-well contracts are generally short-term in nature and cover the drilling of a single well or a series of wells. Term contracts are entered into for a specified period of time (frequently one to three years) and provide for the use of the drilling rig to drill multiple wells. During 2011, our average number of days to drill a well (which includes moving to the drill site, rigging up and rigging down) was approximately 22 days.

Our drilling contracts obligate us to provide and operate a drilling rig and to pay certain operating expenses, including wages of drilling personnel and necessary maintenance expenses. Most drilling contracts are subject to termination by the customer on short notice and may or may not contain provisions for the payment of an early termination payment to us in the event that the contract is terminated by the customer. We believe that our drilling contracts generally provide for identification rights and obligations that are customary for the markets in which we conduct those operations; however, each drilling contract contains the actual terms setting forth our rights and obligations and those of the customer, any of which rights and obligations may deviate from what is customary due to particular industry conditions or other factors.

Our drilling contracts provide for payment on a daywork, footage or turnkey basis, or a combination thereof. In each case, we provide the rig and crews. Our bid for each job depends upon location, depth and anticipated complexity of the well, on-site drilling conditions, equipment to be used, estimated risks involved, estimated duration of the job, availability of drilling rigs and other factors particular to each proposed well.

Under daywork contracts, we provide the drilling rig and crew to the customer. The customer supervises the drilling of the well. Our compensation is based on a contracted rate per day during the period the drilling rig is utilized. We often receive a lower rate when the drilling rig is moving or when drilling operations are interrupted or restricted by adverse weather conditions or other conditions beyond our control. Daywork contracts typically provide separately for mobilization of the drilling rig. Except for two wells drilled under footage contracts in 2009, all of the wells we drilled in 2011, 2010 and 2009 were under daywork contracts.

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Under footage contracts, we contract to drill a well to a certain depth under specified conditions for a fixed price per foot. The customer provides drilling fluids, casing, cementing and well design expertise. These contracts require us to bear the cost of services and supplies that we provide until the well has been drilled to the agreed-upon depth. If we drill the well in less time than estimated, we have the opportunity to improve our profits over those that would be attainable under a daywork contract. Profits are reduced and losses may be incurred if the well requires more days to drill to the contracted depth than estimated. Footage contracts generally contain greater risks for a drilling contractor than daywork contracts. Under footage contracts, the drilling contractor typically assumes certain risks associated with loss of the well from fire, blowouts and other risks. We drilled two wells under footage contracts in 2009, and we did not drill any wells under footage contracts in 2011 or 2010.

Under turnkey contracts, we contract to drill a well to a certain depth under specified conditions for a fixed fee. In a turnkey arrangement, we are required to bear the costs of services, supplies and equipment beyond those typically provided under a footage contract. In addition to the drilling rig and crew, we are required to provide the drilling and completion fluids, casing, cementing, and the technical well design and engineering services during the drilling process. We also typically assume certain risks associated with drilling the well such as fires, blowouts, cratering of the well bore and other such risks. Compensation occurs only when the agreed-upon scope of the work has been completed, which requires us to make larger up-front working capital commitments prior to receiving payments under a turnkey drilling contract. Under a turnkey contract, we have the opportunity to improve our profits if the drilling process goes as expected and there are no complications or time delays. Given the increased exposure we have under a turnkey contract, however, profits can be significantly reduced and losses can be incurred if complications or delays occur during the drilling process. Turnkey contracts generally involve the highest degree of risk among the three different types of drilling contracts. Although we have entered into turnkey contracts in the past, we did not enter into any turnkey contracts in the past three years.

Contract Drilling Activity — Information regarding our contract drilling activity for the last three years follows:

	Year Ended December 31,
	2011		2010		2009
Average rigs operating per day(1)		216		168		91
Number of rigs operated during the year		250		220		243
Number of wells drilled during the year		3,529		2,919		1,539
Number of operating days		78,758		61,244		33,394

(1) A rig is considered to be operating if it is earning revenue pursuant to a contract on a given day.

Drilling Rigs and Related Equipment — We have made significant upgrades during the last several years to our drilling fleet to match the needs of our customers. While conventional wells remain an important source of natural gas and oil, our customers have expanded the development of shale and other unconventional wells to help supply the long-term demand for natural gas and oil in North America.

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To address our customers’ needs for drilling wells in the newer horizontal shale and other unconventional resource plays, we have expanded our areas of operation and improved the capability of our drilling fleet. We have delivered new APEX™ rigs to the market and have made performance and safety improvements to existing high capacity rigs. APEX 1500™ rigs are 1,500 horsepower electric rigs with advanced electronic drilling systems, 500 ton top drives, iron roughnecks, hydraulic catwalks, and other highly automated pipe handling equipment. APEX 1000™ rigs are 1,000 horsepower electric rigs with advanced technology equipment similar to the APEX 1500™ rigs, but with a more compact design to fit on smaller locations. APEX Walking™ rigs are designed to efficiently drill multiple wells from a single pad, by “walking” between the wellbores without requiring time to lower the mast and lay down the drill pipe. As of December 31, 2011 our drilling fleet was comprised of the following:

	Number of Rigs
Classification	U.S.		Canada		Total
APEX 1500™ rigs		38		—		38
APEX 1000™ rigs (including eight with walking systems)		13		—		13
APEX Walking™ rigs		40		—		40
Other electric rigs		46		8		54
Total electric rigs		137		8		145
Mechanical rigs		171		12		183
Total		308		20		328

We estimate the depth capacity with respect to our marketable rigs as of December 31, 2011 to be as follows:

	Number of Rigs
Depth Rating (Ft.)	U.S.		Canada		Total
5,250 to 7,999		—		3		3
8,000 to 11,999		31		9		40
12,000 to 15,999		175		8		183
16,000 to 25,000		102		—		102
Total		308		20		328

At December 31, 2011, we owned and operated 326 trucks and 403 trailers used to rig down, transport and rig up our drilling rigs. Our ownership of trucks and trailers reduces our dependency upon third parties for these services and generally enhances the efficiency of our contract drilling operations in periods of high drilling rig utilization.

We perform repair and overhaul work to our drilling rig equipment at our yard facilities located in Texas, Oklahoma, Wyoming, Colorado, Pennsylvania and western Canada.

Pressure Pumping Operations

General — We provide pressure pumping services to oil and natural gas operators primarily in Texas (Southwest Region) and the Appalachian Basin (Northeast Region). Pressure pumping services consist of well stimulation and cementing for the completion of new wells and remedial work on existing wells. Wells drilled in shale formations and other unconventional plays require well stimulation through fracturing to allow the flow of oil and natural gas. This is accomplished by pumping fluids under pressure into the well bore to fracture the formation. Many wells in conventional plays also receive well stimulation services. The cementing process inserts material between the wall of the well bore and the casing to support and stabilize the casing.

Pressure Pumping Contracts — Our pressure pumping operations are conducted pursuant to a work order for a specific job or pursuant to a term contract. The term contracts are generally entered into for a specified

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period of time and may include minimum revenue, usage or stage requirements. We are compensated based on a combination of charges for equipment, personnel, materials, mobilization and other items. We believe that our pressure pumping contracts generally provide for indemnification rights and obligations that are customary for the markets in which we conduct those operations; however, each pressure pumping contract contains the actual terms setting forth our rights and obligations and those of the customer, any of which rights and obligations may deviate from what is customary due to particular industry conditions or other factors.

Equipment — We have pressure pumping equipment used in providing hydraulic and nitrogen fracturing services as well as nitrogen, cementing and acid pumping services, with a total of approximately 631,000 hydraulic horsepower as of December 31, 2011. Pressure pumping equipment at December 31, 2011 included:

	Quintiplex Fracturing Equipment		Triplex Fracturing Equipment		Other Pumping Equipment		Total
Southwest Region:
Number of units		107		22		21		150
Approximate hydraulic horsepower		250,750		37,750		20,270		308,770
Northeast Region:
Number of units		76		69		109		254
Approximate hydraulic horsepower		171,000		90,000		61,300		322,300
Combined:
Number of units		183		91		130		404
Approximate hydraulic horsepower		421,750		127,750		81,570		631,070

Our pressure pumping operations are supported by a fleet of other equipment including blenders, tractors, manifold trailers and numerous trailers for transportation of materials to and from the worksite as well as bins for storage of materials at the worksite.

Materials — Our pressure pumping operations require the use of acids, chemicals, proppants, fluid supplies and other materials, any of which can be in short supply, including severe shortages, from time to time. We purchase these materials from various suppliers. These purchases are made in the spot market or pursuant to other arrangements, that do not cover all of our required supply and that sometimes require us to purchase the supply or pay liquidated damages if we do not purchase the material. Given the limited number of suppliers of certain of our materials, we may not always be able to make alternative arrangements if we are unable to reach an agreement with a supplier for continued provision of any particular material or should one of our suppliers fail to deliver or timely deliver our materials.

Oil and Natural Gas Interests

We own and invest in oil and natural gas assets as a non-operating working interest owner. Our oil and natural gas working interests are located primarily in producing regions of Texas and New Mexico. Our oil and natural gas assets constituted less than 1% of our consolidated assets as of December 31, 2011.

Customers

The customers of each of our contract drilling and pressure pumping business segments are oil and natural gas operators. Our customer base includes both major and independent oil and natural gas operators. During 2011, no single customer accounted for 10% or more of our consolidated operating revenues.

Competition

Our contract drilling and pressure pumping businesses are highly competitive. Historically, available equipment used in these businesses has frequently exceeded demand. The price for our services is a key competitive factor, in part because equipment used in our businesses can be moved from one area to another in response to market conditions. In addition to price, we believe availability, condition and technical specifications

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of equipment, quality of personnel, service quality and safety record are key factors in determining which contractor is awarded a job. We expect that the market for land drilling and pressure pumping services will continue to be highly competitive.

Government and Environmental Regulation

All of our operations and facilities are subject to numerous federal, state, foreign, and local laws, rules and regulations related to various aspects of our business, including:

• drilling of oil and natural gas wells,

• the relationships with our employees,

• containment and disposal of hazardous materials, oilfield waste, other waste materials and acids,

• use of underground storage tanks,

• use of underground injection wells, and

• hydraulic fracturing and related activities.

To date, applicable environmental laws and regulations in the United States and Canada have not required the expenditure of significant resources outside the ordinary course of business. We do not anticipate any material capital expenditures for environmental control facilities or extraordinary expenditures to comply with environmental rules and regulations in the foreseeable future. However, compliance costs under existing laws or under any new requirements could become material, and we could incur liability in any instance of noncompliance.

Our business is generally affected by political developments and by federal, state, foreign, and local laws and regulations that relate to the oil and natural gas industry. The adoption of laws and regulations affecting the oil and natural gas industry for economic, environmental and other policy reasons could increase costs relating to drilling and production, and otherwise have an adverse effect on our operations. Federal, state, foreign and local environmental laws and regulations currently apply to our operations and may become more stringent in the future. Any suspension or moratorium of the services we provide, whether or not short-term in nature, by a federal, state, foreign or local governmental authority, could have a material adverse effect on our business, financial condition and results of operation.

We believe we use operating and disposal practices that are standard in the industry. However, hydrocarbons and other materials may have been disposed of, or released in or under properties currently or formerly owned or operated by us or our predecessors, which may have resulted, or may result, in soil and groundwater contamination in certain locations. Any contamination found on, under or originating from the properties may be subject to remediation requirements under federal, state, foreign and local laws and regulations. In addition, some of these properties have been operated by third parties over whom we have no control of their treatment of hydrocarbon and other materials or the manner in which they may have disposed of or released such materials. We could be required to remove or remediate wastes disposed of or released by prior owners or operators. In addition, it is possible we could be held responsible for oil and natural gas properties in which we own an interest but are not the operator.

Some of the environmental laws and regulations that are applicable to our business operations are discussed in the following paragraphs, but the discussion does not cover all environmental laws and regulations that govern our operations.

In the United States, the Federal Comprehensive Environmental Response Compensation and Liability Act of 1980, as amended, commonly known as CERCLA, and comparable state statutes impose strict liability on:

• owners and operators of sites, and

• persons who disposed of or arranged for the disposal of “hazardous substances” found at sites.

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The Federal Resource Conservation and Recovery Act (“RCRA”), as amended, and comparable state statutes govern the disposal of “hazardous wastes.” Although CERCLA currently excludes petroleum from the definition of “hazardous substances,” and RCRA also excludes certain classes of exploration and production wastes from regulation, such exemptions by Congress under both CERCLA and RCRA may be deleted, limited, or modified in the future. If such changes are made to CERCLA and/or RCRA, we could be required to remove and remediate previously disposed of materials (including materials disposed of or released by prior owners or operators) from properties (including ground water contaminated with hydrocarbons) and to perform removal or remedial actions to prevent future contamination.

The Federal Water Pollution Control Act and the Oil Pollution Act of 1990, as amended, and implementing regulations govern:

• the prevention of discharges, including oil and produced water spills, and

• liability for drainage into waters.

The Oil Pollution Act imposes strict liability for a comprehensive and expansive list of damages from an oil spill into waters from facilities. Liability may be imposed for oil removal costs and a variety of public and private damages. Penalties may also be imposed for violation of federal safety, construction and operating regulations, and for failure to report a spill or to cooperate fully in a clean-up.

The Oil Pollution Act also expands the authority and capability of the federal government to direct and manage oil spill clean-up and operations, and requires operators to prepare oil spill response plans in cases where it can reasonably be expected that substantial harm will be done to the environment by discharges on or into navigable waters. Failure to comply with ongoing requirements or inadequate cooperation during a spill event may subject a responsible party, such as us, to civil or criminal actions. Although the liability for owners and operators is the same under the Federal Water Pollution Act, the damages recoverable under the Oil Pollution Act are potentially much greater and can include natural resource damages.

Our activities include the performance of hydraulic fracturing services to enhance the production of oil and natural gas from formations with low permeability, such as shales. Due to concerns raised relating to potential impacts of hydraulic fracturing on groundwater quality, legislative and regulatory efforts at the federal level and in some states have been initiated to render permitting and compliance requirements more stringent for hydraulic fracturing or prohibit the activity altogether. Such efforts could have an adverse effect on oil and natural gas production activities, which in turn could have an adverse effect on the hydraulic fracturing services that we render for our exploration and production customers. See “Item 1A. Risk Factors — Potential Legislation and Regulation Covering Hydraulic Fracturing Could Increase Our Costs and Result in Operational Delays.”

In Canada, a variety of Canadian federal, provincial and municipal laws and regulations impose, among other things, restrictions, liabilities and obligations in connection with the generation, handling, use, storage, transportation, treatment and disposal of hazardous substances and wastes and in connection with spills, releases and emissions of various substances to the environment. These laws and regulations also require that facility sites and other properties associated with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable regulatory authorities. In addition, new projects or changes to existing projects may require the submission and approval of environmental assessments or permit applications. These laws and regulations are subject to frequent change, and the clear trend is to place increasingly stringent limitations on activities that may affect the environment.

Our operations are also subject to federal, state, foreign and local laws, rules and regulations for the control of air emissions, including the Federal Clean Air Act and the Canadian Environmental Protection Act. We and our customers may be required to make capital expenditures in the future for air pollution control equipment in connection with obtaining and maintaining operating permits and approvals for air emissions. For example, in July 2011, the U.S. Environmental Protection Agency (“EPA”) published proposed New Source Performance Standards (“NSPS”) and National Emissions Standards for Hazardous Air Pollutants (“NESHAP”) that would impose, among other things, new standards for completions of hydraulically fractured natural gas wells. For more information, please refer to our discussion under “Item 1A. Risk Factors — We Are Subject to Compliance with

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Stringent Environmental Laws and Regulations That May Expose Us to Significant Costs and Liabilities, and Future Regulations May Be More Stringent.”

We are aware of the increasing focus of local, state, national and international regulatory bodies on greenhouse gas (“GHG”) emissions and climate change issues. We are also aware of legislation proposed by United States lawmakers and the Canadian legislature to reduce GHG emissions, as well as GHG emissions regulations enacted by the EPA and the Canadian provinces of Alberta and British Columbia. We will continue to monitor and assess any new policies, legislation or regulations in the areas where we operate to determine the impact of GHG emissions and climate change on our operations and take appropriate actions, where necessary. Any direct and indirect costs of meeting these requirements may adversely affect our business, results of operations and financial condition. See “Item 1A. Risk Factors — Legislation and Regulation of Greenhouse Gases Could Adversely Affect Our Business.”

Risks and Insurance

Our operations are subject to many hazards inherent in the contract drilling and pressure pumping businesses, including inclement weather, blowouts, well fires, loss of well control, pollution and reservoir damage. These hazards could cause personal injury or death, work stoppage, and serious damage to equipment and other property. Our operations could also cause significant environmental and reservoir damages. These risks could expose us to substantial liability for personal injury, wrongful death, property damage, loss of oil and natural gas production, pollution and other environmental damages.

We have indemnification agreements with many of our customers, and we also maintain liability and other forms of insurance. In general, our drilling and pressure pumping contracts typically contain contractual rights to indemnity from our customer for, among other things, reservoir and certain pollution damage. Our contractual right to indemnification, however, may be unenforceable or limited due to negligent or willful acts or omissions by us, our subcontractors and/or suppliers. Our customers may dispute, or be unable to meet, their contractual indemnification obligations to us due to financial, legal or other reasons. Accordingly, we may be unable to transfer these risks to our customers by contract or indemnification agreements. Incurring a liability for which we are not fully indemnified or insured could have a material adverse effect on our business, financial condition, cash flows and results of operations.

We maintain insurance coverage of types and amounts that we believe to be customary for our businesses, but we are not fully insured against all risks, either because insurance is not available or because of the high premium costs. The insurance coverage that we maintain includes insurance for fire, windstorm and other risks of physical loss to our rigs and other assets, employer’s liability, automobile liability, commercial general liability insurance, workers’ compensation and insurance for other specific risks. We cannot assure, however, that any insurance obtained by us will be adequate to cover any losses or liabilities, or that this insurance will continue to be available or available on terms that are acceptable to us. While we carry insurance to cover physical damage to, or loss of, our drilling rigs and other assets, such insurance does not cover the full replacement cost of the rigs or other assets. We have also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. For example, we generally maintain a $1.0 million per occurrence deductible on our workers’ compensation and equipment insurance coverage and a $2.0 million per occurrence self insured retention on our general liability insurance coverage. We self-insure a number of other risks, including loss of earnings and business interruption, and do not carry a significant amount of insurance to cover risks of underground reservoir damage. If a significant accident or other event occurs and is not fully covered by insurance or an enforceable or recoverable indemnity from a customer, it could have a material adverse effect on our business, financial condition, cash flows and results of operations.

Our insurance will not in all situations provide sufficient funds to protect us from all liabilities that could result from our operations. Our coverage includes aggregate policy limits and exclusions. As a result, we retain the risk for any loss in excess of these limits or that is otherwise excluded from our coverage. There can be no assurance that insurance will be available to cover any or all of our operational risks, or, even if available, that insurance premiums or other costs will not rise significantly in the future, so as to make the cost of such

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insurance prohibitive or that our coverage will cover a specific loss. Further, we may experience difficulties in collecting from insurers or such insurers may deny all or a portion of our claims for insurance coverage. Incurring a liability for which we are not fully insured or indemnified could materially affect our business, financial condition, cash flows and results of operations. See “Item 1A. Risk Factors — Our Operations Are Subject to a Number of Operational Risks, Including Environmental and Weather Risks, Which Could Expose Us to Significant Losses and Damage Claims. We Are Not Fully Insured Against All of These Risks and Our Contractual Indemnity Provisions May Not Fully Protect Us.”

Employees

We had approximately 8,200 full-time employees at December 31, 2011. The number of employees fluctuates depending on the current and expected demand for our services. We consider our employee relations to be satisfactory. None of our employees are represented by a union.

Seasonality

Seasonality has not significantly affected our overall operations, however the winter weather in the Appalachian Basin has recently resulted in slower activity for our pressure pumping operations. In addition, our drilling operations in Canada and, to a lesser extent, our pressure pumping operations in the Appalachian Basin, are subject to slow periods of activity during the annual Spring thaw.

Raw Materials and Subcontractors

We use many suppliers of raw materials and services. Although these materials and services have historically been available, there is no assurance that such materials and services will continue to be available on favorable terms or at all. We also utilize numerous independent subcontractors from various trades.

Item 1A. Risk Factors.

You should consider each of the following factors as well as the other information in this Report in evaluating our business and our prospects. Additional risks and uncertainties not presently known to us or that we currently consider immaterial may also impair our business operations. If any of the following risks actually occur, our business, financial condition, cash flows and results of operations could be harmed. You should also refer to the other information set forth in this Report, including our consolidated financial statements and the related notes.

Global Economic Conditions May Adversely Affect Our Operating Results.

Beginning in late 2008 and continuing through 2009, there was a substantial deterioration in the global economic environment. As part of this deterioration, there was substantial uncertainty in the capital markets and access to financing was reduced. Due to these conditions, our customers reduced or curtailed their drilling programs, which resulted in a decrease in demand for our services. Furthermore, these factors resulted in certain of our customers experiencing an inability to pay suppliers, including us. Although the significant deterioration in the global economic environment appeared to stabilize to some degree during 2010 and 2011, there is no assurance that the global economic environment will not quickly deteriorate again due to one or more factors. A return of the conditions causing a deterioration in the global economic environment could have a material adverse effect on our business, financial condition, cash flows and results of operations.

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We Are Dependent on the Oil and Natural Gas Industry and Market Prices for Oil and Natural Gas. Declines in Customers’ Operating and Capital Expenditures and in Oil and Natural Gas Prices May Adversely Affect Our Operating Results.

We depend on our customers’ willingness to make operating and capital expenditures to explore for, develop and produce oil and natural gas in North America. If these expenditures decline, our business may suffer. Our customers’ willingness to explore, develop and produce depends largely upon prevailing industry conditions that are influenced by numerous factors over which we have no control, such as:

• the supply of and demand for oil and natural gas, including current natural gas storage capacity and usage,

• the prices, and expectations about future prices, of oil and natural gas,

• the supply of and demand for drilling and pressure pumping equipment,

• the cost of exploring for, developing, producing and delivering oil and natural gas,

• public pressure on, and legislative and regulatory interest within, federal, state and local governments to stop, significantly limit or regulate drilling and hydraulic fracturing activities, and

• merger and divestiture activity among oil and natural gas producers.

In particular, our revenue, profitability and cash flows are highly dependent upon prevailing prices for oil and natural gas and expectations about future prices. For many years, oil and natural gas prices and markets have been extremely volatile. Prices are affected by factors such as:

• market supply and demand,

• international military, political and economic conditions,

• the ability of the Organization of Petroleum Exporting Countries, commonly known as OPEC, to set and maintain production and price targets,

• technical advances affecting energy consumption, and

• the price and availability of alternative fuels.

All of these factors are beyond our control. During the second quarter of 2008, the quarterly average market price of natural gas (Henry Hub spot price as reported by the Energy Information Administration) was $11.74 per Mcf and the quarterly average market price of oil (WTI spot price as reported by the Energy Information Administration) was $123.95 per barrel. In the last half of 2008, commodity prices rapidly declined and averaged $6.60 per Mcf for natural gas and $58.35 per barrel for oil in the fourth quarter of 2008. In 2009, the price of natural gas declined further and averaged $4.06 per Mcf for the year. Oil prices remained depressed during 2009 as well and averaged $61.65 per barrel for the year. These declines in the market price of natural gas and oil resulted in our customers significantly reducing their drilling activities beginning in the fourth quarter of 2008, and drilling activities remained low throughout 2009. Drilling activities increased in 2010 as did the prices for oil and natural gas. The increased drilling activity was largely attributed to increased development of unconventional oil and natural gas reservoirs and an improvement in the price of oil which averaged $79.40 per barrel in 2010. Drilling for oil and liquids rich targets continued to increase in 2011 as oil averaged $94.86 per barrel for the year. Natural gas prices decreased in 2011 to an average of $4.00 per Mcf. The 2011 decrease in natural gas prices was most significant in the fourth quarter where the average price dropped to $3.32 per Mcf and this decrease has continued into 2012 where natural gas prices fell below $3.00 per Mcf in January. The increase in drilling activity in oil rich basins has absorbed the decrease in demand for natural gas drilling activities in 2011 and our rig count increased in both 2010 and 2011. Our average number of rigs operating remains well below the number of our available rigs. Construction of new land drilling rigs in the United States during the last ten years has significantly contributed to excess capacity. As a result of decreased drilling activity and excess capacity, our average number of rigs operating has declined from historic highs. We expect oil and natural gas prices to continue to be volatile and to affect our financial condition, operations and ability to access sources of capital. Low market prices for oil and natural gas would likely result in lower demand for our drilling rigs and pressure

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pumping services and could adversely affect our operating results, financial condition and cash flows. Even during periods of high prices for oil and natural gas, companies exploring for oil and natural gas may cancel or curtail programs, or reduce their levels of capital expenditures for exploration and production for a variety of reasons, which could reduce demand for our drilling rigs and pressure pumping services.

A General Excess of Operable Land Drilling Rigs, Increasing Rig Specialization and Excess Pressure Pumping Equipment May Adversely Affect Our Utilization and Profit Margins.

The North American oil and natural gas services industry has experienced downturns in demand during the last decade. During these periods, there have been substantially more drilling rigs and pressure pumping equipment available than necessary to meet demand. As a result, drilling and pressure pumping contractors have had difficulty sustaining profit margins and, at times, have incurred losses during the downturn periods.

In addition, unconventional resource plays have substantially increased and some drilling rigs are not capable of drilling these wells efficiently. Accordingly, the utilization of some older technology drilling rigs may be hampered by their lack of capability to successfully compete for this work. Other ongoing factors which could continue to adversely affect utilization rates and pricing, even in an environment of high oil and natural gas prices and increased drilling activity, include:

• movement of drilling rigs from region to region,

• reactivation of land-based drilling rigs, or

• construction of new technology drilling rigs.

Construction of new technology drilling rigs has increased in recent years. The addition of new technology drilling rigs to the market, combined with a reduction in the drilling of vertical wells, has resulted in excess capacity of conventional drilling rigs. Similarly, the substantial recent increase in unconventional resource plays has led to higher demand for pressure pumping services and we believe there has been, and we expect there to continue to be, a significant increase in the construction of new pressure pumping equipment. The addition of new pressure pumping equipment, as well as any general decline in demand for pressure pumping services, could result in there being substantially more pressure pumping equipment available than necessary to meet demand. If this were to occur, providers of pressure pumping services will have difficulty sustaining profit margins and may sustain losses during downturn periods. We cannot predict the future level of demand for our contract drilling or pressure pumping services or future conditions in the oil and natural gas contract drilling or pressure pumping businesses.

Shortages of Drill Pipe, Replacement Parts, Other Equipment, Supplies and Materials Adversely Affect Our Operating Results.

During periods of increased demand for drilling and pressure pumping services, the industry has experienced shortages of drill pipe, replacement parts, other equipment, supplies and materials, including, in the case of our pressure pumping operations, proppants, acid, gel and water. These shortages can cause the price of these items to increase significantly and require that orders for the items be placed well in advance of expected use. In addition, any interruption in supply could result in significant delays in delivery of equipment and materials or prevent operations. Interruptions may be caused by, among other reasons:

• weather issues, whether short-term such as a hurricane, or long-term such as a drought, and

• a shortage in the number of vendors able or willing to provide the necessary equipment, supplies and materials, including as a result of commitments of vendors to other customers or third parties.

These price increases, delays in delivery and interruptions in supply may require us to increase capital and repair expenditures and incur higher operating costs. Severe shortages, delays in delivery and interruptions in supply could limit our ability to construct and operate our drilling rigs and pressure pumping equipment and could have a material adverse effect on our business, financial condition, cash flows and results of operations.

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Fixed Term Contracts May in Certain Instances Be Terminated Without an Early Termination Payment.

Fixed term drilling contracts customarily provide for termination at the election of the customer, with an “early termination payment” to be paid to us if a contract is terminated prior to the expiration of the fixed term. However, in certain limited circumstances, for example, destruction of a drilling rig that is not replaced within a specified period of time, our bankruptcy, or a sustained breach of our contract obligations, no early termination payment may be paid to us. Additionally, during depressed market conditions or otherwise, customers may seek to terminate, renegotiate or fail to honor their contractual obligations. The failure to receive an early termination payment under a number of our fixed-term contracts could have a material adverse effect on our business, financial condition, cash flows and results of operations.

The Oil Service Business Segments in Which We Operate Are Highly Competitive with Excess Capacity, which Adversely Affects Our Operating Results.

Our land drilling and pressure pumping businesses are highly competitive. At times, available land drilling rigs and pressure pumping equipment exceed the demand for such equipment. This excess capacity has resulted in substantial competition for drilling and pressure pumping contracts. The fact that drilling rigs and pressure pumping equipment are mobile and can be moved from one market to another in response to market conditions heightens the competition in the industry.

We believe that price competition for drilling and pressure pumping contracts will continue due to the existence of available rigs and pressure pumping equipment. In recent years, many drilling and pressure pumping companies have consolidated or merged with other companies. Although this consolidation has decreased the total number of competitors, we believe the competition for drilling and pressure pumping services will continue to be intense. As a result of competition, our utilization may decrease and/or we may be unable to maintain or increase prices for our services, which could have a material adverse effect on our business, financial condition, cash flows and results of operations.

Labor Shortages and Rising Labor Costs Adversely Affect Our Operating Results.

During periods of increasing demand for contract drilling and pressure pumping services, the industry experiences shortages of qualified personnel. During these periods, our ability to attract and retain sufficient qualified personnel to market and operate our drilling rigs and pressure pumping equipment is adversely affected, which negatively impacts both our operations and profitability. Operationally, it is more difficult to hire qualified personnel, which adversely affects our ability to mobilize inactive rigs and pressure pumping equipment in response to the increased demand for such services. Additionally, wage rates for drilling and pressure pumping personnel are likely to increase during periods of increasing demand, resulting in higher operating costs.

The Loss of Large Customers Could Have a Material Adverse Effect on Our Financial Condition and Results of Operations.

In 2011, we received approximately 41 percent of our consolidated operating revenues from our ten largest customers (including their affiliates). Although no single customer accounted for more than seven percent of our consolidated operating revenue in 2011, the loss of one or more of our larger customers could have a material adverse effect on our business, financial condition, cash flows and results of operations.

Growth Through the Building of New Rigs and Pressure Pumping Equipment and Rig and Other Acquisitions Are Not Assured.

We have increased our drilling rig fleet and pressure pumping horsepower in the past through mergers, acquisitions and new construction. The land drilling and pressure pumping industries have experienced significant consolidation, and there can be no assurance that acquisition opportunities will be available in the future. We are also likely to continue to face intense competition from other companies for available acquisition opportunities. In addition, because improved technology has enhanced the ability to recover oil and natural gas, contract drillers may continue to build new, high technology rigs and providers of pressure pumping services may continue to build new, high horsepower equipment.

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There can be no assurance that we will:

• have sufficient capital resources to complete additional acquisitions or build new rigs or pressure pumping equipment,

• successfully integrate additional drilling rigs, pressure pumping equipment or other assets,

• effectively manage the growth and increased size of our organization, drilling fleet and pressure pumping equipment,

• successfully deploy idle, stacked or additional rigs and pressure pumping equipment,

• maintain the crews necessary to operate additional drilling rigs and pressure pumping equipment, or

• successfully improve our financial condition, results of operations, business or prospects as a result of any completed acquisition or the building of new drilling rigs and pressure pumping equipment.

We may incur substantial indebtedness to finance future acquisitions, build new drilling rigs or build new pressure pumping equipment and also may issue equity, convertible or debt securities in connection with any such acquisitions or building program. Debt service requirements could represent a significant burden on our results of operations and financial condition, and the issuance of additional equity could be dilutive to existing stockholders. Also, continued growth could strain our management, operations, employees and other resources.

Our Operations Are Subject to a Number of Operational Risks, Including Environmental and Weather Risks, Which Could Expose Us to Significant Losses and Damage Claims. We Are Not Fully Insured Against All of These Risks and Our Contractual Indemnity Provisions May Not Fully Protect Us.

Our operations are subject to many hazards inherent in the contract drilling and pressure pumping businesses, including inclement weather, blowouts, well fires, loss of well control, pollution and reservoir damage. These hazards could cause personal injury or death, work stoppage, and serious damage to equipment and other property. Our operations could also cause significant environmental and reservoir damages. These risks could expose us to substantial liability for personal injury, wrongful death, property damage, loss of oil and natural gas production, pollution and other environmental damages.

We have indemnification agreements with many of our customers, and we also maintain liability and other forms of insurance. In general, our drilling and pressure pumping contracts typically contain contractual rights to indemnity from our customers for, among other things, reservoir and certain pollution damage. Our contractual right to indemnification, however, may be unenforceable or limited due to negligent or willful acts or omissions by us, our subcontractors and/or suppliers. Our customers may dispute, or be unable to meet their contractual indemnification obligations to us due to financial, legal or other reasons. Accordingly, we may be unable to transfer these risks to our customers by contract or indemnification agreements.

We maintain insurance coverage of types and amounts that we believe to be customary in the industry, but we are not fully insured against all risks, either because insurance is not available or because of the high premium costs. The insurance coverage that we maintain includes insurance for fire, windstorm and other risks of physical loss to our rigs and other assets, employer’s liability, automobile liability, commercial general liability insurance, workers’ compensation and insurance for other specific risks. We cannot assure, however, that any insurance obtained by us will be adequate to cover any losses or liabilities, or that this insurance will continue to be available or available on terms that are acceptable to us. While we carry insurance to cover physical damage to, or loss of, our drilling rigs and other assets, such insurance does not cover the full replacement cost of the rigs or other assets. We have also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. For example, we generally maintain a $1.0 million per occurrence deductible on our workers’ compensation and equipment insurance coverage and a $2.0 million per occurrence self insured retention on our general liability insurance coverage. We self-insure a number of other risks, including loss of earnings and business interruption, and do not carry a significant amount of insurance to cover risks of underground reservoir damage.

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Our insurance will not in all situations provide sufficient funds to protect us from all liabilities that could result from our operations. Our coverage includes aggregate policy limits and exclusions. As a result, we retain the risk for any loss in excess of these limits or that is otherwise excluded from our coverage. There can be no assurance that insurance will be available to cover any or all of our operational risks, or, even if available, that insurance premiums or other costs will not rise significantly in the future, so as to make the cost of such insurance prohibitive or that our coverage will cover a specific loss. Further, we may experience difficulties in collecting from insurers or such insurers may deny all or a portion of our claims for insurance coverage. Incurring a liability for which we are not fully insured or indemnified could materially affect our business, financial condition, cash flows and results of operations.

If a significant accident or other event occurs and is not fully covered by insurance or an enforceable or recoverable indemnity from a customer, it could have a material adverse effect on our business, financial condition, cash flows and results of operations.

We Are Dependent Upon our Subsidiaries to Meet our Obligations Under our Long Term Debt

We have borrowings outstanding under a term loan and revolving credit facility as well as our senior notes. These obligations are guaranteed by each of our existing subsidiaries other than immaterial subsidiaries. Our ability to meet our interest and principal payment obligations depends in large part on dividends paid to us by our subsidiaries. If our subsidiaries do not generate sufficient cash flows to pay us dividends, we may be unable to meet our interest and principal payment obligations.

Variable Rate Indebtedness Subjects Us to Interest Rate Risk, Which Could Cause Our Debt Service Obligations to Increase Significantly.

We have in place a committed senior unsecured credit facility that includes a revolving credit facility and a term loan facility. Interest is paid on the outstanding principal amount of borrowings under the credit facility at a floating rate based on, at our election, LIBOR or a base rate. The margin on LIBOR loans ranges from 2.75% to 3.75% and the margin on base rate loans ranges from 1.75% to 2.75%, based on our debt to capitalization ratio. At December 31, 2011, the margin on LIBOR loans was 2.75% and the margin on base rate loans was 1.75%. As of December 31, 2011, we had $110 million outstanding under our revolving credit facility at a weighted average interest rate of 4.05% and $92.5 million outstanding under our term credit facility at an interest rate of 3.25%. A one percent increase in the interest rate on the borrowings outstanding under our revolving and term credit facilities as of December 31, 2011 would increase our annual cash interest expense by approximately $2.0 million. Interest rates could rise for various reasons in the future and increase our total interest expense, depending upon the amounts borrowed.

New Technologies May Cause Our Drilling and Pressure Pumping Processes and Equipment to Become Less Competitive, Resulting in an Adverse Effect on our Financial Condition and Results of Operations.

Changes in technology or improvements in competitors’ processes and equipment could make our processes and equipment less competitive or require significant capital expenditures to keep our processes and equipment competitive. Any such changes in technology could have a material adverse effect on our business, financial condition, cash flows and results of operations.

Environmental Laws and Regulations, Including Violations Thereof Could Materially Adversely Affect Our Operating Results.

All of our operations and facilities are subject to numerous federal, state, foreign and local environmental laws, rules and regulations, including, without limitation, laws concerning the containment and disposal of hazardous substances, oil field waste and other waste materials, the use of underground storage tanks, and the use of underground injection wells. The cost of compliance with these laws and regulations could be substantial. A failure to comply with these requirements could expose us to substantial civil and criminal penalties. In addition, environmental laws and regulations in the United States and Canada impose a variety of requirements on “responsible parties” related to the prevention of oil spills and liability for damages from such spills. As an owner and operator of land-based drilling rigs and pressure pumping equipment, we may be deemed to be a responsible party under these laws and regulations.

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Changes in environmental laws and regulations occur frequently and such laws and regulations tend to become more stringent over time. Stricter laws, regulations or enforcement policies could significantly increase compliance costs for us and our customers and have a material adverse effect on our operations or financial position. For example, in July 2011, the EPA issued proposed rules under the NSPS and NESHAP programs that would, among other things, impose new standards for flowback operations during completions at new, hydraulically fractured or re-fractured natural gas wells. These proposed rules may require the implementation of new operating standards which may impact our business. If these or other initiatives result in an increase in regulation, it could increase costs to us and our customers or reduce demand for our services, which could have a material adverse effect on our business, financial condition, cash flows and results of operations.

Potential Legislation and Regulation Covering Hydraulic Fracturing Could Increase Our Costs and Result in Operational Delays.

Members of the U.S. Congress and the EPA are reviewing more stringent regulation of hydraulic fracturing, a technology employed by our pressure pumping business, which involves the injection of water, sand and chemicals under pressure into rock formations to stimulate oil and natural gas production. Both the EPA and the U.S. Congress are studying whether there is any link between hydraulic fracturing activities and soil or ground water contamination. As part of their respective studies, the House Subcommittee on Energy and Environment and the EPA each sent requests to a number of companies, including our company, for information on their hydraulic fracturing practices. We have responded to each of the inquiries. In addition, legislation has been proposed in the U.S. Congress to amend the Federal Safe Drinking Water Act to require the disclosure of chemicals used by the oil and gas industry in the hydraulic fracturing process, which could make it easier for third parties opposing the hydraulic fracturing process to initiate legal proceedings based on allegations that specific chemicals used in the fracturing process are impairing ground water or causing other damage. These bills, if adopted, could establish an additional level of regulation at the federal or state level that could lead to operational delays or increased operating costs and could result in additional regulatory burdens that could make it more difficult to perform hydraulic fracturing and increase our costs of compliance and doing business. Certain states where we operate, including Texas, have adopted or are considering similar disclosure legislation. For example, Colorado, North Dakota, Montana, Texas, Louisiana, and Wyoming have adopted a variety of well construction, set back and disclosure regulations limiting how fracturing can be performed and requiring various degrees of chemical disclosure. In addition, the EPA has asserted federal regulatory authority over hydraulic fracturing involving diesel additives under the Safe Drinking Water Act’s Underground Injection Control Program and has begun the process of drafting guidance documents related to this newly asserted regulatory authority. Additional regulation could increase the costs of conducting our business and could materially reduce our business opportunities and revenues if our customers decrease their levels of activity in response to such regulation.

There are also certain governmental reviews either underway or being proposed that focus on environmental aspects of hydraulic fracturing practices, including the White House Council on Environmental Quality and a committee of the United States House of Representatives. Furthermore, a number of federal agencies, including the EPA and the U.S. Department of Energy, are analyzing, or have been requested to review a variety of environmental issues associated with hydraulic fracturing. Also, the U.S. Department of the Interior is considering disclosure requirements or other mandates for hydraulic fracturing on federal lands. These ongoing or proposed studies, depending on their course, and any meaningful results obtained, could spur initiatives to further regulate hydraulic fracturing under the Safe Drinking Water Act or other regulatory mechanism.

Legislation and Regulation of Greenhouse Gases Could Adversely Affect our Business

We are aware of the increasing focus of local, state, national and international regulatory bodies on GHG emissions and climate change issues. We are also aware of legislation proposed by United States lawmakers and the Canadian legislature to reduce GHG emissions, as well as GHG emissions regulations enacted by the EPA and the Canadian provinces of Alberta and British Columbia. In December 2009, the EPA determined that emissions of carbon dioxide, methane and other GHG present a danger to public health and the environment

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because emissions of such gases are, according to the EPA, contributing to the warming of the earth’s atmosphere and other climatic changes. Based on its findings, the EPA has begun adopting and implementing regulations to restrict emissions of GHGs under existing provisions of the Federal Clean Air Act, including one regulation that requires a reduction in emissions of GHGs from motor vehicles and another that regulates emissions of GHGs from certain large sources. In addition, the EPA published rules requiring reporting of GHG emissions from specified large GHG emission sources in the United States on an annual basis, which has been amended to include certain onshore and offshore oil and natural gas production facilities. In addition, almost one-half of the states have already taken legal measures to reduce emissions of GHGs primarily through the planned development of GHG emission inventories and/or regional GHG cap and trade programs. We will continue to monitor and assess any new policies, legislation or regulations in the areas where we operate to determine the impact of GHG emissions and climate change on our operations and take appropriate actions, where necessary. Any direct and indirect costs of meeting these requirements may adversely affect our business, results of operations and financial condition. Because our business depends on the level of activity in the oil and natural gas industry, existing or future laws or regulations related to GHGs and climate change, including incentives to conserve energy or use alternative energy sources, could have a negative impact on our business if such laws or regulations reduce demand for oil and natural gas.

Anti-takeover Measures in Our Charter Documents and Under State Law Could Discourage an Acquisition and Thereby Affect the Related Purchase Price.

We are a Delaware corporation subject to the Delaware General Corporation Law, including Section 203, an anti-takeover law. Our restated certificate of incorporation authorizes our Board of Directors to issue up to one million shares of preferred stock and to determine the price, rights (including voting rights), conversion ratios, preferences and privileges of that stock without further vote or action by the holders of the common stock. It also prohibits stockholders from acting by written consent without the holding of a meeting. In addition, our bylaws impose certain advance notification requirements as to business that can be brought by a stockholder before annual stockholder meetings and as to persons nominated as directors by a stockholder. As a result of these measures and others, potential acquirers might find it more difficult or be discouraged from attempting to effect an acquisition transaction with us. This may deprive holders of our securities of certain opportunities to sell or otherwise dispose of the securities at above-market prices pursuant to any such transactions.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties

Our property consists primarily of drilling rigs, pressure pumping equipment and related equipment. We own substantially all of the equipment used in our businesses.

Our corporate headquarters is in leased office space and is located at 450 Gears Road, Suite 500, Houston, Texas. Our telephone number at that address is (281) 765-7100. Our primary administrative office, which is located in Snyder, Texas, is owned and includes approximately 37,000 square feet of office and storage space.

Contract Drilling Operations — Our drilling services are supported by several offices and yard facilities located throughout our areas of operations, including Texas, Oklahoma, Colorado, North Dakota, Wyoming, Pennsylvania and western Canada.

Pressure Pumping — Our pressure pumping services are supported by several offices and yard facilities located throughout our areas of operations including Texas, Pennsylvania, Ohio, West Virginia, Kentucky, Tennessee and Colorado.

Oil and Natural Gas Working Interests — Our interests in oil and natural gas properties are primarily located in Texas and New Mexico.

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We own our administrative offices in Snyder, Texas, as well as several of our other facilities. We also lease a number of facilities, and we do not believe that any one of the leased facilities is individually material to our operations. We believe that our existing facilities are suitable and adequate to meet our needs.

We incorporate by reference in response to this item the information set forth in Item 1 of this Report and the information set forth in Note 4 of the Notes to Consolidated Financial Statements included in Item 8 of this Report.

Item 3. Legal Proceedings.

We are party to various legal proceedings arising in the normal course of our business. We do not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on our results of operations, cash flows or financial condition.

Item 4. Mine Safety Disclosure.

Not applicable.

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PART II

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

(a) Market Information

Our common stock, par value $0.01 per share, is publicly traded on the Nasdaq Global Select Market and is quoted under the symbol “PTEN.” Our common stock is included in the S&P MidCap 400 Index and several other market indices. The following table provides high and low sales prices of our common stock for the periods indicated:

	High		Low
2010:
First quarter	$	18.67	$	13.19
Second quarter		16.15		11.85
Third quarter		17.42		12.52
Fourth quarter		22.67		16.59
2011:
First quarter	$	29.49	$	19.60
Second quarter		32.42		26.38
Third quarter		34.09		17.22
Fourth quarter		23.90		15.06

(b) Holders

As of February 9, 2012, there were approximately 1,500 holders of record of our common stock.

(c) Dividends

We paid cash dividends during the years ended December 31, 2010 and 2011 as follows:

	Per Share		Total
			(in thousands)
2010:
Paid on March 30, 2010	$	0.05	$	7,677
Paid on June 30, 2010		0.05		7,706
Paid on September 30, 2010		0.05		7,704
Paid on December 30, 2010		0.05		7,709
Total cash dividends	$	0.20	$	30,796
2011:
Paid on March 30, 2011	$	0.05	$	7,708
Paid on June 30, 2011		0.05		7,772
Paid on September 30, 2011		0.05		7,777
Paid on December 30, 2011		0.05		7,788
Total cash dividends	$	0.20	$	31,045

On February 1, 2012, our Board of Directors approved a cash dividend on our common stock in the amount of $0.05 per share to be paid on March 30, 2012 to holders of record as of March 15, 2012. The amount and timing of all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of our credit facilities and other factors.

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(d) Securities Authorized for Issuance Under Equity Compensation Plans

Equity compensation plan information as of December 31, 2011 follows:

	Equity Compensation Plan Information
Plan Category	Number of Securities to be Issued upon Exercise of Outstanding Options, Warrants and Rights		Weighted- Average Exercise Price of Outstanding Options, Warrants and Rights		Number of Securities Remaining Available for Future Issuance under Equity Compensation Plans (Excluding Securities Reflected in Column(a))
	(a)		(b)		(c)
Equity compensation plans approved by security holders(1)		7,045,495	$	20.76		4,399,951
Equity compensation plans not approved by security holders(2)		35,800	$	14.64		—
Total		7,081,295	$	20.73		4,399,951

(1) The Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended (the “2005 Plan”), provides for awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards and dividend equivalents to key employees, officers and directors, which are subject to certain vesting and forfeiture provisions. All options are granted with an exercise price equal to or greater than the fair market value of the common stock at the time of grant. The vesting schedule and term are set by the Compensation Committee of the Board of Directors. All securities remaining available for future issuance under equity compensation plans approved by security holders in column (c) are available under this plan. In addition to the 2005 Plan, this Plan category also includes the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended (the “1997 Plan”). In connection with the approval of the 2005 Plan, the Board of Directors approved a resolution that no further options, restricted stock or other awards would be granted under any equity compensation plan, other than the 2005 Plan. Options granted under the 1997 Plan typically vested over three or five years as dictated by the Compensation Committee. All options were granted with an exercise price equal to the fair market value of the related common stock at the time of grant.

(2) The Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (the “2001 Plan”) was approved by the Board of Directors in July 2001. In connection with the approval of the 2005 Plan, the Board of Directors approved a resolution that no further options, restricted stock or other awards would be granted under any equity compensation plan, other than the 2005 Plan. The terms of the 2001 Plan provided for grants of stock options, stock appreciation rights, shares of restricted stock and performance awards to eligible employees other than officers and directors. No incentive stock options could be awarded under the 2001 Plan. All options were granted with an exercise price equal to or greater than the fair market value of the common stock at the time of grant. The vesting schedule and term were set by the Compensation Committee of the Board of Directors.

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(e) Unregistered Sales of Equity Securities and Use of Proceeds

The table below sets forth the information with respect to purchases of our common stock made by us during the quarter ended December 31, 2011.

Period Covered	Total Number of  Shares Purchased		Average Price Paid per Share		Total Number of Shares  (or Units) Purchased as Part of Publicly Announced Plans or Programs		Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs (in thousands)(1)
October 1-31, 2011(2)		4,709	$	19.74		664	$	112,868
November 1-30, 2011(2)		51	$	19.11		—	$	112,868
December 1-31, 2011(2)		51	$	20.25		—	$	112,868
Total		4,811	$	19.74		664	$	112,868

(1) On August 1, 2007, our Board of Directors approved a stock buyback program authorizing purchases of up to $250 million of our common stock in open market or privately negotiated transactions.

(2) We withheld 4,045 shares in October, 51 shares in November and 51 shares in December from employees with respect to their tax withholding obligations upon the vesting of restricted shares. The price paid was the closing price of our common stock on the last business day prior to the date the shares vested. These purchases were made pursuant to the terms of the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan and not pursuant to the stock buyback program.

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(e) Performance Graph

The following graph compares the cumulative stockholder return of our common stock for the period from December 31, 2006 through December 31, 2011, with the cumulative total return of the Standard & Poors 500 Stock Index, the Standard & Poors MidCap Index, the Oilfield Service Index and a peer group determined by us. Our peer group consists of Helmerich & Payne, Inc., Nabors Industries, Ltd., Pioneer Drilling Company, Bronco Drilling Company, Inc. and Precision Drilling Corp. Bronco Drilling Company, Inc. was acquired by another entity in 2011. All of the companies in our peer group are providers of land-based drilling services. Nabors Industries, Ltd. also is a provider of pressure pumping services. BJ Services Company and Superior Well Services, Inc. were members of our peer group for 2010, but they were acquired by other entities in 2010 and are therefore not members of our peer group for 2011. The graph assumes investment of $100 on December 31, 2006 and reinvestment of all dividends.

	Fiscal Year Ended December 31,
Company/Index	2006 ($)		2007 ($)		2008 ($)		2009 ($)		2010 ($)		2011 ($)
Patterson-UTI Energy, Inc.		100.00		85.70		52.15		70.66		100.39		93.86
Peer Group Index		100.00		100.07		49.76		79.64		93.03		90.69
S&P 500 Stock Index		100.00		105.49		66.46		84.05		96.71		98.76
Oilfield Service Index		100.00		151.52		61.40		99.57		126.39		113.02
S&P MidCap Index		100.00		107.97		68.84		94.57		119.77		117.68

The foregoing graph is based on historical data and is not necessarily indicative of future performance. This graph shall not be deemed to be “soliciting material” or to be “filed” with the SEC or subject to Regulations 14A or 14C under the Exchange Act or to the liabilities of Section 18 under such Act.

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Item 6. Selected Financial Data.

Our selected consolidated financial data as of December 31, 2011, 2010, 2009, 2008 and 2007, and for each of the five years in the period ended December 31, 2011 should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the Consolidated Financial Statements and related Notes thereto, included as Items 7 and 8, respectively, of this Report. Due to the sale of our drilling and completion fluids business in January 2010 and the sale of our electric wireline business in January 2011, the results of operations for those businesses have been reclassified and are presented as discontinued operations in all periods presented.

	Years Ended December 31,
	2011			2010			2009			2008			2007
	(In thousands, except per share amounts)
Statement of Operations Data:
Operating revenues:
Contract drilling	$	1,669,581		$	1,081,898		$	599,287		$	1,804,026		$	1,741,647
Pressure pumping		845,803			350,608			161,441			217,494			202,812
Oil and natural gas		50,559			30,425			21,218			42,360			41,637
Total		2,565,943			1,462,931			781,946			2,063,880			1,986,096
Operating costs and expenses:
Contract drilling		972,778			655,678			357,742			1,038,327			963,150
Pressure pumping		561,398			235,100			124,100			147,377			117,250
Oil and natural gas		9,615			7,020			7,341			12,793			10,864
Depreciation, depletion, amortization and impairment		437,279			333,493			289,847			275,990			246,346
Selling, general and administrative		64,271			53,042			43,935			43,273			42,688
Net (gain) loss on asset disposals		(4,999	)		(22,812	)		3,385			(4,163	)		(16,432	)
Provision for bad debts		—			(2,000	)		3,810			4,350			2,875
Embezzlement recoveries		—			—			—			—			(43,955	)
Acquisition-related expenses		—			2,485			—			—			—
Total		2,040,342			1,262,006			830,160			1,517,947			1,322,786
Operating income (loss)		525,601			200,925			(48,214	)		545,933			663,310
Other income (expense)		(14,883	)		(10,171	)		(3,341	)		1,425			527
Income (loss) from continuing operations before income taxes		510,718			190,754			(51,555	)		547,358			663,837
Income tax expense (benefit)		187,938			72,856			(17,595	)		193,490			229,350
Income (loss) from continuing operations	$	322,780		$	117,898		$	(33,960	)	$	353,868		$	434,487
Income (loss) from continuing operations per common share:
Basic	$	2.08		$	0.77		$	(0.22	)	$	2.29		$	2.78
Diluted	$	2.06		$	0.76		$	(0.22	)	$	2.27		$	2.75
Cash dividends per common share	$	0.20		$	0.20		$	0.20		$	0.60		$	0.44
Weighted average number of common shares outstanding:
Basic		153,871			152,772			152,069			153,379			154,755
Diluted		155,304			153,276			152,069			154,358			156,612
Balance Sheet Data:
Total assets	$	4,221,901		$	3,423,031		$	2,662,152		$	2,712,817		$	2,465,199
Borrowings under line of credit		110,000			—			—			—			50,000
Other long term debt		382,500			392,500			—			—			—
Stockholders’ equity		2,516,631			2,187,607			2,081,700			2,126,942			1,896,030
Working capital		346,238			241,445			263,511			337,615			226,209

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

Management Overview — We are a leading provider of services to the North American oil and natural gas industry. Our services primarily involve the drilling, on a contract basis, of land-based oil and natural gas wells and pressure pumping services. In addition to the aforementioned services, we also invest, on a non-operating working interest basis, in oil and natural gas properties. Prior to the sale of substantially all of the assets of our drilling and completion fluids business in January 2010, we provided drilling fluids, completion fluids and related services to oil and natural gas operators. Due to our exit from the drilling and completion fluids business in January 2010, we have presented the results of that business as discontinued operations in this Report. We acquired an electric wireline business on October 1, 2010 and sold the business on January 27, 2011. Due to our exit from the electric wireline business, we have presented the results of that business as discontinued operations in this Report.

As of December 31, 2011, we had a drilling fleet that consisted of 328 marketable land-based drilling rigs. Although there continued to be uncertainty with respect to the global economic environment and fluctuation of commodity prices, activity in our drilling business continued to increase during 2011. In the fourth quarter of 2011, our average number of rigs operating increased to 232 including 220 in the United States and 12 in Canada, as compared to an average of 194 drilling rigs operating, including 182 rigs in the United States and 12 rigs in Canada during the same period in 2010.

While conventional wells remain an important source of natural gas and oil, this increased activity results, in part, from our addressing our customers’ needs for drilling wells in the newer horizontal shale and other unconventional resource plays by expanding our areas of operation and improving the capabilities of our drilling fleet during the last several years. As of December 31, 2011, we have completed 91 new APEX™ rigs and made performance and safety improvements to existing high capacity rigs. We expect to complete an additional 30 new APEX™ rigs in 2012. In connection with the newer horizontal shale and other unconventional resource plays, we see a continued need for equipment to perform service intensive fracturing jobs. As of December 31, 2011, we have also added over 467,000 hydraulic horsepower to our pressure pumping fleet since the end of 2009, and we had a total of approximately 631,000 hydraulic horsepower in our pressure pumping fleet at the end of 2011. Though the beginning of 2012 has seen unusually low natural gas prices, high oil prices are expected to increase drilling and pressure pumping activity in the oil and liquids rich areas.

We maintain a backlog of commitments for contract drilling revenues under long-term contracts, which we define as contracts with a fixed term of one year or more. Our backlog as of December 31, 2011 was approximately $1.6 billion. We expect approximately $898 million of our backlog to be realized in 2012. We calculate our backlog by multiplying the day rate under our long-term drilling contracts by the number of days remaining under the contract. The calculation does not include any revenues related to other fees such as for mobilization, demobilization and customer reimbursables, nor does it include potential reductions in rates during periods in which the rig is moving, on standby or incurring maintenance and repair time in excess of what is permitted under the drilling contract. In addition, generally our long-term drilling contracts are subject to termination by the customer on short notice and provide for the payment of an early termination payment to us in the event that the contract is terminated by the customer. See Item 1A. Risk Factors — Fixed Term Contracts May in Certain Instances be Terminated Without an Early Termination Payment.

For the three years ended December 31, 2011, our operating revenues from continuing operations consisted of the following (dollars in thousands):

	2011				2010				2009
Contract drilling	$	1,669,581	65	%	$	1,081,898	74	%	$	599,287	76	%
Pressure pumping		845,803	33			350,608	24			161,441	21
Oil and natural gas		50,559	2			30,425	2			21,218	3
	$	2,565,943	100	%	$	1,462,931	100	%	$	781,946	100	%

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Generally, the profitability of our business is impacted most by two primary factors in our contract drilling segment: our average number of rigs operating and our average revenue per operating day. During 2011, our average number of rigs operating was 216 compared to 168 in 2010 and 91 in 2009. Our average revenue per operating day was $21,200 in 2011 compared to $17,670 in 2010 and $17,950 in 2009. Additionally, our pressure pumping segment experienced an increase in large multi-stage fracturing jobs in 2011 compared to 2010 and 2009. This increase includes the contribution of a pressure pumping business we acquired on October 1, 2010, which significantly expanded our pressure pumping operations into new markets in the fourth quarter of 2010. We had consolidated net income of $322 million for 2011 compared to $117 million for 2010. The increase in consolidated net income was primarily due to our contract drilling segment experiencing an increase in the average number of rigs operating and an increase in the average revenue per operating day as well as greater activity, pricing and size of our pressure pumping business.

Our revenues, profitability and cash flows are highly dependent upon prevailing prices for oil and natural gas. During periods of improved commodity prices, the capital spending budgets of oil and natural gas operators tend to expand, which generally results in increased demand for our services. Conversely, in periods when these commodity prices deteriorate, the demand for our services generally weakens and we experience downward pressure on pricing for our services. After reaching a peak in June 2008, there was a significant extended decline in oil and natural gas prices and a substantial deterioration in the global economic environment. As part of this deterioration, there was substantial uncertainty in the capital markets and access to financing was reduced. Due to these conditions, our customers reduced or curtailed their drilling programs, which resulted in a decrease in demand for our services, as evidenced by the decline in our monthly average number of rigs operating from a high of 283 in October 2008 to a low of 60 in June 2009. Our monthly average number of rigs operating has subsequently increased from the mid-year low of 60 in 2009 to 233 in December 2011 and our profitability has improved.

We are also highly impacted by operational risks, competition, the availability of excess equipment, labor issues and various other factors that could materially adversely affect our business, financial condition, cash flows and results of operations. Please see “Risk Factors” in Item 1A of this Report.

Critical Accounting Policies

In addition to established accounting policies, our consolidated financial statements are impacted by certain estimates and assumptions made by management. The following is a discussion of our critical accounting policies pertaining to property and equipment, goodwill, revenue recognition, the use of estimates and oil and natural gas properties,.

Property and equipment — Property and equipment, including betterments which extend the useful life of the asset, are stated at cost. Maintenance and repairs are charged to expense when incurred. We provide for the depreciation of our property and equipment using the straight-line method over the estimated useful lives. Our method of depreciation does not change when equipment becomes idle; we continue to depreciate idled equipment on a straight-line basis. No provision for salvage value is considered in determining depreciation of our property and equipment. We review our long-lived assets, including property and equipment, for impairment whenever events or changes in circumstances (“triggering events”) indicate that the carrying values of certain assets may not be recovered over their estimated remaining useful lives. In connection with this review, assets are grouped at the lowest level at which identifiable cash flows are largely independent of other asset groupings. The cyclical nature of our industry has resulted in fluctuations in rig utilization over periods of time. Management believes that the contract drilling industry will continue to be cyclical and rig utilization will continue to fluctuate. Based on management’s expectations of future trends, we estimate future cash flows over the life of the respective assets or asset groupings in our assessment of impairment. These estimates of cash flows are based on historical cyclical trends in the industry as well as management’s expectations regarding the continuation of these trends in the future. Provisions for asset impairment are charged against income when estimated future cash flows, on an undiscounted basis, are less than the asset’s net book value. Any provision for impairment is measured based on discounted cash flows.

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On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type (such as drilling conventional vertical wells versus drilling longer horizontal wells using high capacity rigs). In connection with our ongoing planning process, we evaluated our then-current fleet of marketable drilling rigs in 2011, 2010 and 2009 and identified 53, four and 23 rigs, during each of those years respectively, that we determined were impaired and would no longer be marketed as rigs based on our assessment of estimated expenditures to bring these rigs into condition to operate in the current environment, as well as our assessment of future demand and the suitability of the identified rigs in light of this expected demand. The components comprising these rigs were evaluated, and those components with continuing utility to our other marketed rigs were transferred to other rigs or to our yards to be used as spare equipment. The fair value of the remaining components of these rigs was estimated to be zero as there was no future cash flow expected and the associated net book value of $15.7 million in 2011, $4.2 million in 2010 and $10.5 million in 2009 was expensed in our consolidated statements of operations as an impairment charge.

In late 2008, oil and natural gas prices decreased significantly, and we experienced a significant decrease in the number of our rigs operating. A continued decrease in the operating levels in our contract drilling segment through the first half of 2009 was deemed by us to be a triggering event that required us to perform an assessment with respect to impairment of long-lived assets, including property and equipment, in our contract drilling segment in 2009. With respect to these long-lived assets, we estimated future cash flows over the expected life of the long-lived assets, which were comprised primarily of drilling rigs and related equipment (excluding the rigs which had been removed from our marketable fleet), and determined that, on an undiscounted basis, expected cash flows exceeded the carrying value of the long-lived assets at that time. Based on this assessment, no further impairment was indicated in 2009. In light of the favorable trends in rig utilization and revenue per operating day experienced by us and our peers in 2010 and 2011, we concluded that no triggering events occurred in 2010 or 2011 with respect to our contract drilling segment as a whole which would indicate that the carrying amounts of long-lived assets in that segment may not be recoverable (excluding the rigs which had been removed from our marketable fleet). We concluded that no triggering event occurred with respect to our pressure pumping segment in 2011, 2010 or 2009. Impairment considerations related to our oil and natural gas segment are discussed below.

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. We assess impairment of our goodwill annually as of December 31, or on an interim basis if events or circumstances indicate that the fair value of goodwill may have decreased below its carrying value. Goodwill impairment testing is performed at the level of our reporting units. Our reporting units have been determined to be the same as our operating segments. We currently have goodwill in our contract drilling and pressure pumping operating segments.

In connection with our annual impairment assessment of goodwill as of December 31, 2010, we first compared the fair value of the reporting units with their carrying value. In completing this first step of our analysis, we estimated our enterprise value based on our market capitalization as determined by reference to the closing price of our common stock during the fifteen days before and after year end. We allocated this enterprise value to our reporting units and determined that the fair values of our reporting units were in excess of their carrying value. The fair value of our reporting units as of December 31, 2010 exceeded the carrying value in all cases such that no impairment was indicated. If the carrying value had exceeded the fair value, we would have measured any impairment of goodwill in that reporting unit by allocating the fair value to the identifiable assets and liabilities of the reporting unit based on their respective fair values. Any excess unallocated fair value would equal the implied fair value of goodwill, and if that amount was below the carrying value of goodwill, an impairment charge would have been recognized.

In September 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update which provides entities with the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then

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performing the two-step impairment test described above is unnecessary. The provisions of this accounting standards update are effective for goodwill impairment tests performed for fiscal years beginning after December 15, 2011, however, early adoption is permitted. We elected to adopt the provisions of the new goodwill impairment accounting standard issued in September 2011 in connection with our annual impairment assessment of goodwill as of December 31, 2011 and determined based on an assessment of qualitative factors that it was more likely than not that the fair values of our reporting units were greater than their carrying amount and further testing was not necessary.

In making our determination, we considered the continued demand experienced during 2011 for our services in the contract drilling and pressure pumping businesses. We also considered the level of commodity prices for crude oil and natural gas, which influence our overall level of business activity in these operating segments. Additionally, current year operating results and forecasted operating results for the coming year were also taken into account. Our overall market capitalization and the large amount of calculated excess of the fair values of our reporting units over their carrying values and lack of significant changes in the key assumptions from our 2010 quantitative Step 1 assessment of goodwill were also considered. We have undertaken extensive efforts in the past several years to upgrade our fleet of equipment and believe that we are well positioned from a competitive standpoint to satisfy demand for high technology drilling of unconventional horizontal wells, which should help mitigate decreases in demand for drilling conventional vertical wells that may result from recent decreases in natural gas prices. In the event that market conditions weaken, we may be required to record an impairment of goodwill in our contract drilling or pressure pumping reporting units in the future, and such impairment could be material.

Revenue recognition — Revenues from daywork drilling and pressure pumping activities are recognized as services are performed. We follow the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and the risks therein, we follow the completed-contract method of accounting for such arrangements. Under this method, revenues and expenses related to a well-in-progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed total revenues. We recognize as revenue reimbursements received from third parties for out-of-pocket expenses and account for those out-of-pocket expenses as direct costs. Except for two wells drilled under footage contacts in 2009, all of the wells we drilled in 2011, 2010 and 2009 were drilled under daywork contracts.

Use of estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.

Key estimates used by management include:

• allowance for doubtful accounts,

• depreciation, depletion and amortization,

• fair values of assets acquired and liabilities assumed in acquisitions,

• goodwill and long-lived asset impairments, and

• reserves for self-insured levels of insurance coverage.

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. Costs of exploratory wells are initially capitalized to

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wells-in-progress until the outcome of the drilling is known. We review wells-in-progress quarterly to determine whether sufficient progress is being made in assessing the reserves and economic viability of the respective projects. If no progress has been made in assessing the reserves and economic viability of a project after one year following the completion of drilling, we consider the well costs to be impaired and recognize the costs as expense. Geological and geophysical costs, including seismic costs and costs to carry and retain undeveloped properties, are charged to expense when incurred. The capitalized costs of both developmental and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves for each respective field.

We review our proved oil and natural gas properties for impairment whenever a triggering event occurs, such as downward revisions in reserve estimates or decreases in oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are prepared based on our expectation of future commodity prices over the lives of the respective fields. These cash flow estimates are reviewed by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between net book value and discounted cash flow. The discounted cash flow estimates used in measuring impairment are based on our expectations of future commodity prices over the life of the respective field. We review unproved oil and natural gas properties quarterly to assess potential impairment. Our impairment assessment is made on a lease-by-lease basis and considers factors such as our intent to drill, lease terms and abandonment of an area. If an unproved property is determined to be impaired, the related property costs are expensed. Impairment expense related to proved and unproved oil and natural gas properties totaled approximately $3.0 million, $792,000 and $3.7 million for the years ended December 31, 2011, 2010 and 2009, respectively, and is included in depreciation, depletion, amortization and impairment in the consolidated statements of operations.

For additional information on our accounting policies, see Note 1 of Notes to Consolidated Financial Statements included as a part of Item 8 of this Report.

Liquidity and Capital Resources

As of December 31, 2011, we had working capital of $346 million, including cash and cash equivalents of $23.9 million, compared to working capital of $241 million and cash and cash equivalents of $27.6 million at December 31, 2010.

During 2011, our sources of cash flow included:

• $869 million from operating activities,

• $110 million in net borrowings under our revolving credit facility,

• $25.5 million in proceeds from the disposal of our electric wireline business,

• $23.2 million from the exercise of stock options and related tax benefits associated with stock-based compensation, and

• $22.5 million in proceeds from the disposal of property and equipment.

During 2011, we used $31.0 million to pay dividends on our common stock, $4.3 million to repurchase shares of our common stock, $6.3 million to repay long-term debt and $1.0 billion:

• to build new drilling rigs and pressure pumping equipment,

• to make capital expenditures for the betterment and refurbishment of our drilling rigs and pressure pumping equipment,

• to acquire and procure equipment and facilities to support our drilling and pressure pumping operations, and

• to fund investments in oil and natural gas properties on a working interest basis.

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We paid cash dividends during the year ended December 31, 2011 as follows:

	Per Share		Total
			(in thousands)
Paid on March 30, 2011	$	0.05	$	7,708
Paid on June 30, 2011		0.05		7,772
Paid on September 30, 2011		0.05		7,777
Paid on December 30, 2011		0.05		7,788
Total cash dividends	$	0.20	$	31,045

On February 1, 2011, our Board of Directors approved a cash dividend on our common stock in the amount of $0.05 per share to be paid on March 30, 2012 to holders of record as of March 15, 2012. The amount and timing of all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of our credit facilities and other factors.

On August 1, 2007, our Board of Directors approved a stock buyback program, authorizing purchases of up to $250 million of our common stock in open market or privately negotiated transactions. During the year ended December 31, 2011, we purchased 8,689 shares of our common stock under this program at a cost of approximately $255,000. As of December 31, 2011, we are authorized to purchase approximately $113 million of our outstanding common stock under this program.

On August 19, 2010, we entered into a Credit Agreement (the “Credit Agreement”). The Credit Agreement is a committed senior unsecured credit facility that includes a revolving credit facility and a term loan facility.

The revolving credit facility permits aggregate borrowings of up to $400 million and contains a letter of credit facility that is limited to $150 million and a swing line facility that is limited to $40 million. Subject to customary conditions, we may request that the lenders’ aggregate commitments with respect to the revolving credit facility be increased by up to $100 million, not to exceed total commitments of $500 million. The maturity date for the revolving credit facility is August 19, 2013.

The term loan facility provided for a loan of $100 million which was funded on August 19, 2010. The term loan facility is payable in quarterly principal installments commencing November 19, 2010. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments, 5.00% of the original principal amount for the next subsequent three quarterly installments, with the remainder becoming due at maturity. The maturity date for the term loan facility is August 19, 2014.

Loans under the Credit Agreement bear interest by reference, at our election, to the LIBOR rate or base rate. The applicable margin on LIBOR rate loans varies from 2.75% to 3.75% and the applicable margin on base rate loans varies from 1.75% to 2.75%, in each case determined based upon our debt to capitalization ratio. As of December 31, 2011, the applicable margin on LIBOR rate loans was 2.75% and the applicable margin on base rate loans was 1.75%. A letter of credit fee is payable by us equal to the applicable margin for LIBOR rate loans times the daily amount available to be drawn under outstanding letters of credit. The commitment fee payable to the lenders for the unused portion of the revolving credit facility varies from 0.50% to 0.75% based upon our debt to capitalization ratio and was 0.50% as of December 31, 2011.

The Credit Agreement contains customary representations, warranties, indemnities and affirmative and negative covenants. The Credit Agreement also requires compliance with two financial covenants. We must not permit our debt to capitalization ratio to exceed 45% at any time. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. We also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal

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quarters to interest charges for the same period. We were in compliance with these financial covenants as of December 31, 2011. We do not expect that the restrictions and covenants will impair, in any material respect, our ability to operate or react to opportunities that might arise.

As of December 31, 2011, we had $92.5 million principal amount outstanding under the term loan facility at an interest rate of 3.25% and had $110 million principal amount outstanding under the revolving credit facility at a weighted-average interest rate of 4.05%. We had $40.6 million in letters of credit outstanding at December 31, 2011, and as a result, we had available borrowing capacity under the revolving credit facility of approximately $249 million at that date.

On October 5, 2010, we completed the issuance and sale of $300 million in aggregate principal amount of our 4.97% Series A Senior Notes due October 5, 2020 (the “Notes”) in a private placement.

The Notes bear interest at a rate of 4.97% per annum. We pay interest on the Notes on April 5 and October 5 of each year. The Notes will mature on October 5, 2020. The Notes are prepayable at our option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the Notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreement. We must offer to prepay the Notes upon the occurrence of any change of control. In addition, we must offer to prepay the Notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid Note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.

The note purchase agreement requires compliance with two financial covenants. We must not permit our debt to capitalization ratio to exceed 50% at any time. The note purchase agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. We also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio for the four prior quarters of EBITDA to interest charges for the same period. We were in compliance with these financial covenants as of December 31, 2011. We do not expect that the restrictions and covenants will impair, in any material respect, our ability to operate or react to opportunities that might arise.

Events of default under the note purchase agreement and the Credit Agreement include failure to pay principal or interest when due, failure to comply with the financial and operational covenants, a cross default event, a judgment in excess of a threshold event, the guaranty agreement ceasing to be enforceable, the occurrence of certain ERISA events, a change of control event and bankruptcy and other insolvency events. If an event of default under the note purchase agreement occurs and is continuing, then holders of a majority in principal amount of the Notes have the right to declare all the notes then-outstanding to be immediately due and payable. In addition, if we default in payments on any Note, then until such defaults are cured, the holder thereof may declare all the Notes held by it to be immediately due and payable.

We believe that our liquidity as of December 31, 2011, which includes approximately $346 million in working capital and approximately $249 million available under our $400 million revolving credit facility, together with cash expected to be generated from operations, should provide us with sufficient ability to fund our current plans to build new equipment, make improvements to our existing equipment, service our debt and pay cash dividends. If we pursue opportunities for growth that require capital, we believe we would be able to satisfy these needs through a combination of working capital, cash flows from operating activities, borrowing capacity under our revolving credit facility or additional debt or equity financing. However, there can be no assurance that such capital will be available on reasonable terms, if at all.

Commitments and Contingencies — As of December 31, 2011, we maintained letters of credit in the aggregate amount of $40.6 million for the benefit of various insurance companies as collateral for retrospective premiums and retained losses which could become payable under the terms of the underlying insurance contracts. These letters of credit expire annually at various times during the year and are typically renewed. As of December 31, 2011, no amounts had been drawn under the letters of credit.

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As of December 31, 2011, we had commitments to purchase approximately $352 million of major equipment for our drilling and pressure pumping businesses.

Our pressure pumping business has entered into agreements to purchase minimum quantities of proppants from certain vendors. These agreements expire in 2013 and 2016. As of December 31, 2011, the remaining obligation under these agreements is approximately $42.5 million, of which materials with a total purchase price of approximately $13.5 million are expected to be delivered during 2012. In the event that the required minimum quantities are not purchased during any contract year, we could be required to make a liquidated damages payment to the respective vendor for any shortfall.

In November 2011, our pressure pumping business entered into an agreement with a proppant vendor to advance, on a non-revolving basis, up to $12.0 million to such vendor to finance its construction of certain processing facilities. This advance is secured by the underlying processing facilities and other assets and bears interest at an annual rate of 5.0%. Repayment of the advance is to be made through discounts applied to purchases from the vendor and repayment of all amounts advanced must be made no later than October 1, 2017. As of December 31, 2011, advances of approximately $2.9 million had been made under this agreement and no significant repayments had been made.

Trading and Investing — We have not engaged in trading activities that include high-risk securities, such as derivatives and non-exchange traded contracts. We invest cash primarily in highly liquid, short-term investments such as overnight deposits and money market accounts.

Contractual Obligations

The following table presents information with respect to our contractual obligations as of December 31, 2011 (dollars in thousands):

	Payments due by period
	Total		Less than 1 year		1-3 years		3-5 years		More than 5 years
Borrowings under revolving credit facility(1)	$	110,000	$	—	$	110,000	$	—	$	—
Interest on revolving credit facility(2)		7,276		4,456		2,820		—		—
Borrowings under term loan(3)		92,500		10,000		82,500		—		—
Interest on term loan(4)		6,351		2,855		3,496		—		—
Series A Senior Notes(5)		300,000		—		—		—		300,000
Interest on Series A Senior Notes(6)		130,636		14,910		29,820		29,820		56,086
Commitments to purchase equipment(7)		351,738		351,738		—		—		—
Commitments to purchase inventory(8)		42,466		13,461		17,617		11,388		—
	$	1,040,967	$	397,420	$	246,253	$	41,208	$	356,086

(1) Any borrowings that are drawn on our revolving credit facility would be due at maturity August 19, 2013. Amount reflected in table is borrowings outstanding as of December 31, 2011.

(2) Interest is calculated at 4.05%, which is the weighted average interest rate on outstanding borrowings under the revolving credit facility as of December 31, 2011.

(3) Represents repayments of borrowing under the term loan portion of the Credit Agreement. The term loan matures on August 19, 2014.

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(4) Interest to be paid on term loan using 3.25% rate in effect as of December 31, 2011.

(5) Principal repayment of the Series A Senior Notes is required at maturity on October 5, 2020.

(6) Interest to be paid on the Series A Senior Notes using 4.97% coupon rate.

(7) Represents commitments to purchase major equipment to be delivered in 2012 based on expected delivery dates.

(8) Represents commitments to purchase proppants for our pressure pumping business.

Off-Balance Sheet Arrangements

We had no off-balance sheet arrangements at December 31, 2011.

Results of Operations

Comparison of the years ended December 31, 2011 and 2010

The following tables summarize operations by business segment for the years ended December 31, 2011 and 2010:

	Year Ended December 31,
Contract Drilling	2011		2010		% Change
	(Dollars in thousands)
Revenues	$	1,669,581	$	1,081,898		54.3	%
Direct operating costs	$	972,778	$	655,678		48.4	%
Selling, general and administrative	$	6,408	$	5,279		21.4	%
Depreciation and impairment	$	344,312	$	280,458		22.8	%
Operating income	$	346,083	$	140,483		146.4	%
Operating days		78,758		61,244		28.6	%
Average revenue per operating day	$	21.20	$	17.67		20.0	%
Average direct operating costs per operating day	$	12.35	$	10.71		15.3	%
Average rigs operating		216		168		28.6	%
Capital expenditures	$	784,686	$	655,550		19.7	%

The demand for our contract drilling services is impacted by the market price of natural gas and oil. The reactivation and construction of new land drilling rigs in the United States in recent years has also contributed to an excess capacity of land drilling rigs compared to demand. The average market price of natural gas and oil for each of the fiscal quarters and full year in 2011 and 2010 follows:

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Year
2010:
Average natural gas price per Mcf(1)	$	5.30	$	4.45	$	4.41	$	3.91	$	4.52
Average oil price per Bbl(2)	$	78.64	$	77.79	$	76.05	$	85.10	$	79.40
2011:
Average natural gas price per Mcf(1)	$	4.18	$	4.37	$	4.12	$	3.32	$	4.00
Average oil price per Bbl(2)	$	93.50	$	102.22	$	89.72	$	93.99	$	94.86

(1) The average natural gas price represents the Henry Hub Spot price as reported by the United States Energy Information Administration.

(2) The average oil price represents the average monthly WTI spot price as reported by the United States Energy Information Administration.

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Revenues and direct operating costs increased in 2011 compared to 2010 as a result of an increase in the number of operating days and increases in average revenue and direct operating costs per operating day. Average revenue per operating day increased in 2011 primarily due to increases in contractual dayrates. Average direct operating costs per operating day increased in 2011 due primarily to higher repairs, maintenance and labor costs. The increase in operating days was largely due to increased demand resulting from higher oil prices. Selling, general and administrative expenses increased in 2011 primarily as a result of increased personnel costs to support increased activity levels. Capital expenditures were incurred in 2011 and 2010 to build new drilling rigs, to modify and upgrade our drilling rigs and to acquire additional related equipment such as top drives, drill pipe, drill collars, engines, fluid circulating systems, rig hoisting systems and safety enhancement equipment. Depreciation expense increased as a result of capital expenditures. Depreciation and impairment expense included approximately $15.7 million in 2011 and approximately $4.2 million in 2010 of impairment charges related to drilling equipment on drilling rigs that were removed from our marketable fleet. We removed 53 rigs from our marketable fleet in 2011 and removed four rigs from our marketable fleet in 2010.

	Year Ended December 31,
Pressure Pumping	2011		2010		% Change
	(Dollars in thousands)
Revenues	$	845,803	$	350,608		141.2	%
Direct operating costs	$	561,398	$	235,100		138.8	%
Selling, general and administrative	$	17,686	$	12,590		40.5	%
Depreciation and amortization	$	73,279	$	40,724		79.9	%
Operating income	$	193,440	$	62,194		211.0	%
Fracturing jobs		1,531		1,527		0.3	%
Other jobs		7,010		6,047		15.9	%
Total jobs		8,541		7,574		12.8	%
Average revenue per fracturing job	$	467.85	$	180.21		159.6	%
Average revenue per other job	$	18.48	$	12.47		48.2	%
Average revenue per total job	$	99.03	$	46.29		113.9	%
Average direct operating costs per total job	$	65.73	$	31.04		111.8	%
Capital expenditures	$	198,061	$	51,064		287.9	%

Contributing to the increases in revenues, direct operating costs, selling, general and administrative expenses and depreciation and amortization was our acquisition of a pressure pumping business on October 1, 2010, which significantly expanded the size of our fleet of pressure pumping equipment and the markets in which we provide pressure pumping services. This acquisition was accounted for as a business combination and the results of operations of the acquired business are included in our pressure pumping segment results from the date of acquisition. The acquired business contributed revenue of $456 million and operating income of $106 million to our operating results during the year ended December 31, 2011 compared to revenue of $84.7 million and operating income of $22.8 million during the year ended December 31, 2010.

Our customers have increased their activities in the development of unconventional reservoirs resulting in an increase in larger multi-stage fracturing jobs associated therewith. We have added additional equipment through construction and acquisition to meet this demand and expand our area of operations. As a result, we have experienced an increase in the number of these larger multi-stage fracturing jobs as a proportion of the total fracturing jobs we performed. Average revenue per fracturing job increased as a result of this increase in the number of larger multi-stage fracturing jobs in 2011 as compared to 2010, as well as increased pricing. Average revenue per other job increased as a result of increased pricing for the services provided and a change in job mix. Average direct operating costs per total job increased primarily as a result of the increase in the number of larger multi-stage fracturing jobs. Selling, general and administrative expenses in 2011 include $6.4 million associated with the acquired business compared to $1.5 million for 2010. Significant capital expenditures have been incurred in recent years to add capacity in our pressure pumping segment. Depreciation and amortization expense

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in 2011 includes $4.1 million in amortization of intangible assets compared to $1.0 million in amortization of intangible assets for 2010. The remaining increase in depreciation in 2011 compared to 2010 was a result of our recent capital expenditures and our October 1, 2010 acquisition.

	Year Ended December 31,
Oil and Natural Gas Production and Exploration	2011		2010		% Change
	(Dollars in thousands, except commodity prices)
Revenues — Oil	$	44,495	$	24,722		80.0	%
Revenues — Natural gas and liquids	$	6,064	$	5,703		6.3	%
Revenues — Total	$	50,559	$	30,425		66.2	%
Direct operating costs	$	9,615	$	7,020		37.0	%
Depletion and impairment	$	16,962	$	10,950		54.9	%
Operating income	$	23,982	$	12,455		92.5	%
Capital expenditures	$	22,884	$	23,067		(0.8	)%

Total revenues increased as a result of increased production and higher prices for oil and liquids. Oil production increased primarily due to the addition of new wells. Depletion and impairment expense in 2011 includes approximately $3.0 million of oil and natural gas property impairments compared to approximately $792,000 of oil and natural gas property impairments in 2010. Depletion expense increased approximately $3.8 million in 2011 compared to 2010 primarily due to increased oil production.

	Year Ended December 31,
Corporate and Other	2011			2010			% Change
	(Dollars in thousands)
Selling, general and administrative	$	40,177		$	35,173			14.2	%
Depreciation	$	2,726		$	1,361			100.3	%
Net gain on asset disposals	$	(4,999	)	$	(22,812	)		(78.1	)%
Provision for bad debts	$	—		$	(2,000	)		(100.0	)%
Acquisition-related expenses	$	—		$	2,485			(100.0	)%
Interest income	$	187		$	1,674			(88.8	)%
Interest expense	$	15,652		$	12,772			22.5	%
Other income	$	582		$	927			(37.2	)%
Capital expenditures	$	5,947		$	8,409			(29.3	)%

Selling, general and administrative expense increased in 2011 primarily as a result of increased personnel costs. Gains on the disposal of assets are treated as part of our corporate activities because such transactions relate to corporate strategy decisions of our executive management group. The gain on disposal of assets in 2011 is primarily related to the sale of scrap metal. The gain on asset disposals in 2010 includes a gain of $20.1 million related to the sale of certain rights to explore and develop zones deeper than the depths that we generally target for certain of the oil and natural gas properties in which we have working interests. The negative provision for bad debts in 2010 is the result of collections of certain accounts that had previously been reserved, as well as reductions in our reserve for specific accounts due to improved industry conditions. Acquisition-related expenses in 2010 were incurred in connection with the acquisition of pressure pumping and electric wireline businesses during the fourth quarter of 2010. These expenses included certain legal and other professional fees directly related to the transaction, fees incurred in connection with the title transfers of the acquired equipment and transition costs related to information technology. Interest income in 2010 included the collection of interest on a customer account as well as interest received on prior overpayments of sales taxes in certain jurisdictions. Interest expense increased in 2011 primarily due to interest charges on the 4.97% Senior Notes that were issued in October 2010, the term loan that was entered into in August 2010 and interest on borrowings under our revolving credit facility. Capital expenditures decreased in 2010 due to less activity with respect to the implementation of a new enterprise resource planning system in 2011 compared to 2010.

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	Year Ended December 31,
Discontinued Operations:	2011			2010			% Change
	(Dollars in thousands)
Electric wireline revenue	$	1,104		$	5,712			(80.7	)%
Electric wireline direct operating costs	$	1,831		$	4,962			(63.1	)%
Drilling and completion fluids revenue	$	—		$	3,737			(100.0	)%
Drilling and completion fluids direct operating costs	$	—		$	3,307			(100.0	)%
Selling, general and administrative	$	46		$	358			(87.2	)%
Depreciation	$	—		$	166			(100.0	)%
Impairment of assets held for sale	$	—		$	2,155			(100.0	)%
Income tax benefit	$	(209	)	$	(543	)		(61.5	)%
Loss from discontinued operations, net of income taxes	$	(367	)	$	(956	)		(61.6	)%

On January 27, 2011, we sold our electric wireline business, which had been acquired by us on October 1, 2010. The results of operations of this business have been classified as a discontinued operation. On January 20, 2010, we sold our drilling and completion fluids services business, which had previously been presented as one of our reportable operating segments. Due to our exit from this business, we have classified our drilling and completion fluids operating segment as a discontinued operation. Impairment of assets held for sale in 2010 reflects the transaction-related costs recorded to reduce the carrying value of the assets sold to their net realizable value at December 31, 2010.

Comparison of the years ended December 31, 2010 and 2009

The following tables summarize operations by business segment for the years ended December 31, 2010 and 2009:

	Year Ended December 31,
Contract Drilling	2010		2009			% Change
	(Dollars in thousands)
Revenues	$	1,081,898	$	599,287			80.5	%
Direct operating costs	$	655,678	$	357,742			83.3	%
Selling, general and administrative	$	5,279	$	4,340			21.6	%
Depreciation and impairment	$	280,458	$	248,424			12.9	%
Operating income (loss)	$	140,483	$	(11,219	)		N/M
Operating days		61,244		33,394			83.4	%
Average revenue per operating day	$	17.67	$	17.95			(1.6	)%
Average direct operating costs per operating day	$	10.71	$	10.71			0.0	%
Average rigs operating		168		91			84.6	%
Capital expenditures	$	655,550	$	395,376			65.8	%

The demand for our contract drilling services is impacted by the market price of natural gas and oil. The reactivation and construction of new land drilling rigs in the United States in recent years has also contributed to an excess capacity of land drilling rigs compared to demand. The average market price of natural gas and oil for each of the fiscal quarters and full year in 2010 and 2009 follows:

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Year
2009:
Average natural gas price per Mcf (1)	$	4.71	$	3.82	$	3.26	$	4.46	$	4.06
Average oil price per Bbl (2)	$	42.91	$	59.44	$	68.20	$	76.06	$	61.65
2010:
Average natural gas price per Mcf (1)	$	5.30	$	4.45	$	4.41	$	3.91	$	4.52
Average oil price per Bbl (2)	$	78.64	$	77.79	$	76.05	$	85.10	$	79.40

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(1) The average natural gas price represents the Henry Hub Spot price as reported by the United States Energy Information Administration.

(2) The average oil price represents the average monthly WTI spot price as reported by the United States Energy Information Administration.

Revenues and direct operating costs increased in 2010 compared to 2009 as a result of an increase in the number of operating days. The increase in operating days was due to increased demand largely resulting from higher prices for natural gas and oil. Our average number of rigs operating during 2009 included an average of approximately six rigs operating under term contracts that earned standby revenues of $22.3 million. Rigs on standby earn a discounted dayrate as they do not have crews and have lower costs. We had no significant standby revenue associated with rigs operating under term contracts in 2010. We recognized approximately $8.0 million of revenues during 2009 from the early termination of term contracts. We had no such revenue from the early termination of term contracts in 2010. Selling, general and administrative expenses increased in 2010 primarily as a result of increased personnel costs to support increased activity levels. Capital expenditures were incurred in 2010 and 2009 to build new drilling rigs, to modify and upgrade our drilling rigs and to acquire additional related equipment such as top drives, drill pipe, drill collars, engines, fluid circulating systems, rig hoisting systems and safety enhancement equipment. Depreciation expense increased as a result of capital expenditures. Depreciation and impairment expense included approximately $4.2 million in 2010 and approximately $10.5 million in 2009 of impairment charges related to drilling equipment on drilling rigs that were removed from our marketable fleet. We removed four rigs from our marketable fleet in 2010 and removed 23 rigs from our marketable fleet in 2009.

	Year Ended December 31,
Pressure Pumping	2010		2009		% Change
	(Dollars in thousands)
Revenues	$	350,608	$	161,441		117.2	%
Direct operating costs	$	235,100	$	124,100		89.4	%
Selling, general and administrative	$	12,590	$	8,735		44.1	%
Depreciation and amortization	$	40,724	$	27,589		47.6	%
Operating income	$	62,194	$	1,017		N/M
Fracturing jobs		1,527		1,579		(3.3	)%
Other jobs		6,047		5,399		12.0	%
Total jobs		7,574		6,978		8.5	%
Average revenue per fracturing job	$	180.21	$	70.88		154.2	%
Average revenue per other job	$	12.47	$	9.17		36.0	%
Average revenue per total job	$	46.29	$	23.14		100.0	%
Average direct operating costs per total job	$	31.04	$	17.78		74.6	%
Capital expenditures	$	51,064	$	43,144		18.4	%

Contributing to the increases in revenues, direct operating costs, selling, general and administrative expenses and depreciation and amortization was our acquisition of a pressure pumping business on October 1, 2010, which significantly expanded the size of our fleet of pressure pumping equipment and the markets in which we provide pressure pumping services. This acquisition was accounted for as a business combination and the results of operations of the acquired business are included in our pressure pumping segment results from the date of acquisition. The acquired business contributed revenue of $84.7 million and operating income of $22.8 million to our operating results during the year ended December 31, 2010.

Our customers have increased their activities in the development of unconventional reservoirs resulting in an increase in larger multi-stage fracturing jobs associated therewith. As a result, we have experienced an increase in the number of these larger multi-stage fracturing jobs as a proportion of the total fracturing jobs we performed. Average revenue per fracturing job increased as a result of this increase in the number of larger multi-stage fracturing jobs in 2010 as compared to 2009. Average revenue per other job increased as a result of increased pricing for the services provided and a change in job mix. Average direct operating costs per total job increased primarily as a result of the increase in the number of larger multi-stage fracturing jobs. Selling, general

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and administrative expenses in 2010 include $1.5 million associated with the acquired business. The remaining increase in selling, general and administrative expenses is due to additional costs necessary to support increased business activity in 2010. Significant capital expenditures have been incurred in recent years to add capacity in our pressure pumping segment. Depreciation and amortization expense in 2010 includes $1.0 million in amortization of intangible assets and $4.7 million in depreciation of property and equipment associated with the acquired business. The remaining increase in depreciation in 2010 compared to 2009 is a result of our recent capital expenditures.

	Year Ended December 31,
Oil and Natural Gas Production and Exploration	2010		2009		% Change
	(Dollars in thousands, except commodity prices)
Revenues — Oil	$	24,722	$	16,135		53.2	%
Revenues — Natural gas and liquids	$	5,703	$	5,083		12.2	%
Revenues — Total	$	30,425	$	21,218		43.4	%
Direct operating costs	$	7,020	$	7,341		(4.4	)%
Depletion and impairment	$	10,950	$	12,927		(15.3	)%
Operating income	$	12,455	$	950		N/M
Capital expenditures	$	23,067	$	7,341		214.2	%

Total revenues increased as a result of increased production and higher prices for oil and liquids and higher prices for natural gas. Oil production increased primarily due to the addition of new wells. Natural gas production decreased primarily due to production declines on existing wells. Depletion and impairment expense in 2010 includes approximately $792,000 of oil and natural gas property impairments compared to approximately $3.7 million of oil and natural gas property impairments in 2009. Depletion expense increased approximately $915,000 in 2010 compared to 2009 due to increased oil production. Capital expenditures increased in 2010 as a result of greater drilling activity and increased costs per well.

	Year Ended December 31,
Corporate and Other	2010			2009		% Change
	(Dollars in thousands)
Selling, general and administrative	$	35,173		$	30,860		14.0	%
Depreciation	$	1,361		$	907		50.1	%
Net (gain) loss on asset disposals	$	(22,812	)	$	3,385		N/M
Provision for bad debts	$	(2,000	)	$	3,810		N/M
Acquisition-related expenses	$	2,485		$	—		N/M
Interest income	$	1,674		$	381		339.4	%
Interest expense	$	12,772		$	4,148		207.9	%
Other income	$	927		$	426		117.6	%
Capital expenditures	$	8,409		$	6,785		23.9	%

Selling, general and administrative expense increased in 2010 primarily as a result of increased personnel costs. The provision for bad debts in 2009 resulted from an increase in our reserve on specific account balances based on the deteriorating economic and credit environment at the time. Gains and losses on the disposal of assets are treated as part of our corporate activities because such transactions relate to corporate strategy decisions of our executive management group. The gain on asset disposals in 2010 includes a gain of $20.1 million related to the sale of certain rights to explore and develop zones deeper than depths that we generally target for certain of the oil and natural gas properties in which we have working interests. Losses on asset disposals in 2009 were primarily related to the disposal of contract drilling equipment. The negative provision for bad debts in 2010 is the result of collections of certain accounts that had previously been reserved, as well as reductions in our reserve for specific accounts due to improved industry conditions. Acquisition-related expenses in 2010 were incurred in connection with the acquisition of pressure pumping and electric wireline businesses during the fourth quarter of 2010. These expenses included certain legal and other professional fees directly related to the transaction, fees incurred in connection with the title transfers of the acquired equipment and transition costs related to information technology.

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Interest income increased due to the collection of interest on a customer account as well as interest received on prior overpayments of sales taxes in certain jurisdictions. Interest expense in 2010 includes $3.3 million due to the recognition of remaining deferred financing costs associated with a revolving credit facility that was replaced in August 2010, and $1.3 million due to the recognition of financing costs associated with a bridge facility that expired unused on September 30, 2010. The remainder of the 2010 increase relates to interest charges and the amortization of debt issuance costs associated with the $100 million term loan entered into in August 2010 and the $300 million Senior Notes issued in October 2010. Capital expenditures increased in 2010 due to the ongoing implementation of a new enterprise resource planning system.

	Year Ended December 31,
Discontinued Operations:	2010			2009			% Change
	(Dollars in thousands)
Electric wireline revenue	$	5,712		$	—			N/M
Electric wireline direct operating costs	$	4,962		$	—			N/M
Drilling and completion fluids revenue	$	3,737		$	79,786			(95.3	)%
Drilling and completion fluids direct operating costs	$	3,307		$	74,180			(95.5	)%
Selling, general and administrative	$	358		$	7,192			(95.0	)%
Depreciation	$	166		$	2,287			(92.7	)%
Impairment of assets held for sale	$	2,155		$	1,900			13.4	%
Net gain on asset disposals/retirements	$	—		$	(125	)		(100.0	%
Other operating expense	$	—		$	890			(100.0	)%
Income tax benefit	$	(543	)	$	(2,208	)		(75.4	)%
Loss from discontinued operations, net of income taxes	$	(956	)	$	(4,330	)		(77.9	)%

On January 27, 2011, we sold our electric wireline business, which had been acquired by us on October 1, 2010. The results of operations of this business have been classified as a discontinued operation and the assets held for sale at December 31, 2010 are presented at net realizable value in the consolidated balance sheet. On January 20, 2010, we sold our drilling and completion fluids services business, which had previously been presented as one of our reportable operating segments. Due to our exit from this business, we have classified our drilling and completion fluids operating segment as a discontinued operation. Impairment of assets held for sale in 2010 and 2009 reflects the transaction-related costs recorded to reduce the carrying value of the assets sold to their net realizable value at December 31, 2010, and 2009.

Income Taxes

	Year Ended December 31,
	2011			2010			2009
	(Dollars in thousands)
Income (loss) from continuing operations before income tax	$	510,718		$	190,754		$	(51,555	)
Income tax expense (benefit)		187,938			72,856			(17,595	)
Effective tax rate		36.8	%		38.2	%		34.1	%

The effective tax rate is a result of a federal rate of 35.0% adjusted as follows:

	2011			2010			2009
Statutory tax rate		35.0	%		35.0	%		35.0	%
State income taxes		2.5			1.1			4.7
Permanent differences		(0.1	)		2.3			(5.7	)
Other, net		(0.6	)		(0.2	)		0.1
Effective tax rate		36.8	%		38.2	%		34.1	%

39

The Domestic Production Activities Deduction was enacted as part of the American Jobs Creation Act of 2004 (as revised by the Emergency Economic Stabilization Act of 2008), and allows a deduction of 6% in 2009 and 9% in 2010 and thereafter on the lesser of qualified production activities income or taxable income. The permanent differences for 2010 and 2009 reflect the recapture of a portion of this deduction due to the carryback of the net operating loss to prior years. This recapture resulted in a negative effective rate impact in 2009 due to our having a loss before income taxes in that year. The permanent difference for 2011 does not include any impact related to the Domestic Production Activities Deduction as such deduction is limited to the amount of taxable income in any given year and there is a tax loss in 2011.

We record deferred federal income taxes based primarily on the temporary differences between the book and tax bases of our assets. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be settled. As a result of fully recognizing the benefit of our deferred income taxes, we incur deferred income tax expense as these benefits are utilized. We recognized deferred tax expense of approximately $159 million in 2011, $147 million in 2010 and $101 million in 2009.

On January 1, 2010, we converted our Canadian operations from a Canadian branch to a controlled foreign corporation for federal income tax purposes. Because the statutory tax rates in Canada are lower than those in the United States, this transaction triggered a $5.1 million reduction in deferred tax liabilities, which is being amortized as a reduction to deferred income tax expense over the weighted average remaining useful life of the Canadian assets.

As a result of the above conversion, our Canadian assets are no longer directly subject to United States taxation, provided that the related unremitted earnings are permanently reinvested in Canada. Effective January 1, 2010, we have elected to permanently reinvest these unremitted earnings in Canada, and intend to do so for the foreseeable future. As a result, no deferred United States federal or state income taxes have been provided on such unremitted foreign earnings, which totaled approximately $25.2 million as of December 31, 2011.

Volatility of Oil and Natural Gas Prices and its Impact on Operations and Financial Condition

Our revenue, profitability and cash flows are highly dependent upon prevailing prices for oil and natural gas and expectations about future prices. For many years, oil and natural gas prices and markets have been extremely volatile. Prices are affected by factors such as market supply and demand, international military, political and economic conditions, the ability of OPEC to set and maintain production and price targets, technical advances affecting energy consumption and the price and availability of alternative fuels. All of these factors are beyond our control. During the second quarter of 2008, the quarterly average market price of natural gas (Henry Hub spot price as reported by the United States Energy Information Administration) was $11.74 per Mcf and the quarterly average market price of oil (WTI spot price as reported by the Energy Information Administration) was $123.95 per barrel. In the last half of 2008, commodity prices rapidly declined and averaged $6.60 per Mcf for natural gas and $58.35 per barrel for oil in the fourth quarter of 2008. In 2009, the price of natural gas declined further and averaged $4.06 per Mcf for the year. These declines in the market price of natural gas and oil resulted in our customers significantly reducing their drilling activities beginning in the fourth quarter of 2008, and drilling activities remained low throughout 2009. Drilling activities increased in 2010 as did the prices for oil and natural gas. The increased drilling activity was largely attributed to increased development of unconventional oil and natural gas reservoirs and an improvement in the price of oil which averaged $79.40 per barrel in 2010. Drilling for oil and liquids rich targets continued to increase in 2011 as oil averaged $94.86 per barrel for the year. Natural gas prices decreased in 2011 to an average of $4.00 per Mcf. The 2011 decrease in natural gas prices was most significant in the fourth quarter where the average price dropped to $3.32 per Mcf and this decrease has continued into 2012 where natural gas prices fell below $3.00 per Mcf in January. The increase in drilling activity in oil rich basins has absorbed the decrease in demand for natural gas drilling activities in 2011 and our rig count increased in both 2010 and 2011. Our average number of rigs operating remains well below the number of our available rigs. Construction of new land drilling rigs in the United States during the last ten years has significantly contributed to excess capacity. As a result of decreased drilling activity and excess capacity, our average number of rigs operating has declined from historic highs. We expect oil and natural gas prices to

40

continue to be volatile and to affect our financial condition, operations and ability to access sources of capital. Low market prices for oil and natural gas would likely result in lower demand for our drilling rigs and pressure pumping services and could adversely affect our operating results, financial condition and cash flows. Even during periods of high prices for oil and natural gas, companies exploring for oil and natural gas may cancel or curtail programs, or reduce their levels of capital expenditures for exploration and production for a variety of reasons, which could reduce demand for our drilling and pressure pumping services.

Impact of Inflation

Inflation has not had a significant impact on our operations during the three years in the period ended December 31, 2011. We believe that inflation will not have a significant near-term impact on our financial position.

Recently Issued Accounting Standards

In September 2011, the FASB issued an accounting standard update that simplifies how entities test goodwill for impairment. This update permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. Previous guidance required an entity to test goodwill for impairment, on at least an annual basis, by comparing the fair value of a reporting unit with its carrying amount. If the fair value of a reporting unit is less than its carrying amount, then the second step of the test must be performed to measure the amount of the impairment loss, if any. Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. This update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted if an entity’s financial statements for the most recent annual or interim period have not yet been issued. We elected to early adopt this accounting standards update as of December 31, 2011 as discussed further in Note 5 to the Consolidated Financial Statements included in Item 8 of this Report.

In June 2011, the FASB issued an accounting standard update that requires that all non-owner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present total net income and its components followed consecutively by a second statement that should present total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. Historically, these components of other comprehensive income and total comprehensive income have been presented in the statement of changes in stockholders’ equity by many companies, including us. This requirement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will result in the addition of a new consolidated statement of comprehensive income to our consolidated financial statements beginning with the quarter ending March 31, 2012.

In May 2011, the FASB issued an accounting standard update to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with United States GAAP and International Financial Reporting Standards. The amendments in this update do not require additional fair value measurements, but provide additional guidance as to measuring fair value as well as certain additional disclosure requirements. The requirements in this update are effective during interim and annual periods beginning after December 15, 2011 and will be effective for us in the quarter ending March 31, 2012. The adoption of this update will not have a material impact on the disclosures included in our consolidated financial statements.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

We currently have exposure to interest rate market risk associated with any borrowings that we have under our term credit facility or our revolving credit facility. Interest is paid on the outstanding principal amount of

41

borrowings at a floating rate based on, at our election, LIBOR or a base rate. The margin on LIBOR loans ranges from 2.75% to 3.75% and the margin on base rate loans ranges from 1.75% to 2.75%, based on our debt to capitalization ratio. At December 31, 2011, the margin on LIBOR loans was 2.75% and the margin on base rate loans was 1.75%. As of December 31, 2011, we had $110 million outstanding under our revolving credit facility at a weighted average interest rate of 4.05% and $92.5 million outstanding under our term credit facility at an interest rate of 3.25%. The interest rate on the borrowing outstanding under our term credit facility is variable and adjusts at each interest payment date based on our election of LIBOR or the base rate. A one percent increase in the interest rate on the borrowing outstanding under our revolving and term credit facilities as of December 31, 2011 would increase our annual cash interest expense by approximately $2.0 million.

We conduct a portion of our business in Canadian dollars through our Canadian land-based drilling operations. The exchange rate between Canadian dollars and U.S. dollars has fluctuated during the last several years. If the value of the Canadian dollar against the U.S. dollar weakens, revenues and earnings of our Canadian operations will be reduced and the value of our Canadian net assets will decline when they are translated to U.S. dollars. This currency risk is not material to our results of operations or financial condition.

The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items.

Item 8. Financial Statements and Supplementary Data.

Financial Statements are filed as a part of this Report at the end of Part IV hereof beginning at page F-1, Index to Consolidated Financial Statements, and are incorporated herein by this reference.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Disclosure Controls and Procedures:

Under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), we conducted an evaluation of the effectiveness of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Exchange Act, as of the end of the period covered by this Report. Based on this evaluation, our CEO and CFO concluded that, as of December 31, 2011, 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 SEC rules and forms and is accumulated and reported to our management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control over Financial Reporting:

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our CEO and CFO, we carried out an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2011, based on the Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, our management has concluded that our internal control over financial reporting was effective as of December 31, 2011.

The effectiveness of our internal control over financial reporting as of December 31, 2011 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears on page F-2 of this Report and which is incorporated by reference into Item 8 of this Report.

42

Changes in Internal Control over Financial Reporting:

There have been no changes in our internal control over financial reporting during the most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information

None.

43

PART III

The information required by Part III is omitted from this Report because we expect to file a definitive proxy statement (the “Proxy Statement”) pursuant to Regulation 14A of the Securities Exchange Act of 1934 no later than 120 days after the end of the fiscal year covered by this Report and certain information included therein is incorporated herein by reference.

Item 10. Directors, Executive Officers and Corporate Governance.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

We have adopted a Code of Business Conduct and Ethics for Senior Financial Executives, which covers, among others, our principal executive officer, principal financial officer and principal accounting officer. The text of this code is located on our website under “Governance.” Our Internet address is www.patenergy.com. We intend to disclose any amendments to or waivers from this code on our website.

Item 11. Executive Compensation.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

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

The information required by this Item is incorporated herein by reference to the Proxy Statement.

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

The information required by this Item is incorporated herein by reference to the Proxy Statement.

Item 14. Principal Accountant Fees and Services.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

44

PART IV

Item 15. Exhibits and Financial Statement Schedule.

(a)(1) Financial Statements

See Index to Consolidated Financial Statements on page F-1 of this Report.

(a)(2) Financial Statement Schedule

Schedule II — Valuation and qualifying accounts is filed herewith on page S-1.

All other financial statement schedules have been omitted because they are not applicable or the information required therein is included elsewhere in the financial statements or notes thereto.

(a)(3) Exhibits

The following exhibits are filed herewith or incorporated by reference herein.

2.1	Asset Purchase Agreement dated July 2, 2010 by and among Patterson-UTI Energy, Inc., Portofino Acquisition Company (n/k/a Universal Pressure Pumping, Inc.), Key Energy Pressure Pumping Services, LLC, Key Electric Wireline Services, LLC and Key Energy Services, Inc. (filed July 6, 2010 as Exhibit 2.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
2.2	Letter Agreement dated September 1, 2010 by and among Patterson-UTI Energy, Inc., Universal Pressure Pumping, Inc., Universal Wireline, Inc., Key Energy Services, Inc., Key Energy Pressure Pumping Services, LLC, and Key Electric Wireline Services LLC (filed November 1, 2010 as Exhibit 2.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2010 and incorporated herein by reference).
2.3	Letter Agreement dated October 1, 2010 by and among Patterson-UTI Energy, Inc., Universal Pressure Pumping, Inc., Universal Wireline, Inc., Key Energy Services, Inc., Key Energy Pressure Pumping Services, LLC, and Key Electric Wireline Services LLC (filed November 1, 2010 as Exhibit 2.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2010 and incorporated herein by reference).
3.1	Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
3.2	Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
3.3	Certificate of Elimination with respect to Series A Participating Preferred Stock (filed October 27, 2011 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
3.4	Second Amended and Restated Bylaws (filed August 6, 2007 as Exhibit 3.3 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2007 and incorporated herein by reference).
4.1	Restated Certificate of Incorporation, as amended (See Exhibits 3.1, 3.2 and 3.3).
4.2	Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned to REMY Capital Partners III, L.P. (filed March 19, 2002 as Exhibit 4.3 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
10.1	For additional material contracts, see Exhibit 4.2.

45

10.2	Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27, 2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company's Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
10.3	Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as Exhibit 4.7 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
10.4	Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed August 9, 2004 as Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
10.5	Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock Option Agreement (filed June 21, 2005 as Exhibit 10.1 to the Company's Current Report on Form 8-K, and incorporated herein by reference).*
10.6	First Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
10.7	Second Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
10.8	Third Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed April 27, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*
10.9	Fourth Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed April 27, 2010 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*
10.10	Fifth Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed August 2, 2010 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference).*
10.11	Form of Cash-Settled Performance Unit Award Agreement pursuant to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended from time to time (filed February 19, 2010 as Exhibit 10.9 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference).*
10.12	Form of Amendment to Cash-Settled Performance Unit Award Agreement under the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed May 4, 2010 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2010 and incorporated herein by reference).*
10.13	Form of Share-Settled Performance Unit Award Agreement under the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed August 2, 2010 as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2010 and incorporated herein by reference).*
10.14	Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed on February 25, 2005 as Exhibit 10.23 to the Company's Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*

46

10.15	Letter Agreement dated February 6, 2006 between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed May 1, 2006 as Exhibit 10.25 to the Company’s Annual Report on Form 10-K, as amended, and incorporated herein by reference).*
10.16	Employment Agreement, dated as of September 1, 2007 between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed on September 24, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference).*
10.17	Employment Agreement, effective as of January 1, 2012, by and between Patterson-UTI Drilling Company LLC and James M. Holcomb. *+
10.18	Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Cloyce A. Talbott, Douglas J. Wall, Kenneth N. Berns, Curtis W. Huff, Terry H. Hunt, Kenneth R. Peak, Charles O. Buckner, John E. Vollmer III, Seth D. Wexler and Gregory W. Pipkin (filed April 28, 2004 as Exhibit 10.11 to the Company's Annual Report on Form 10-K, as amended, for the year ended December 31, 2003 and incorporated herein by reference).*
10.19	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.20	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of August 31, 2007, by and between Patterson-UTI Energy, Inc. and Douglas J. Wall (filed September 4, 2007 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*
10.21	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.22	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.23	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Mark S. Siegel, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.24	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Douglas J. Wall, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.9 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.25	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and John E. Vollmer, III, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.10 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.26	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Kenneth N. Berns, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.11 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.27	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of November 2, 2009, by and between Patterson-UTI Energy, Inc. and Seth D. Wexler (filed November 2, 2009 as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2009 and incorporated herein by reference).*

47

10.28	Credit Agreement dated August 19, 2010, among Patterson-UTI Energy, Inc., as borrower, Wells Fargo Bank, N.A., as administrative agent, letter of credit issuer and lender and each of the other letter of credit issuer and lender parties thereto (filed August 19, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
10.29	Note Purchase Agreement dated October 5, 2010 by and among Patterson-UTI Energy, Inc. and the purchasers named therein (filed October 6, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
21.1	Subsidiaries of the Registrant.+
23.1	Consent of Independent Registered Public Accounting Firm.+
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.+
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.+
32.1	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.+
101	The following materials from Patterson-UTI Energy, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2011, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Income, (iii) the Consolidated Statements of Changes in Stockholders’ Equity, (iv) the Consolidated Statements of Cash Flows, and (v) Notes to Consolidated Financial Statements.+

* Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.

+ Filed herewith.

48

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page
Report of Independent Registered Public Accounting Firm		F-2
Consolidated Financial Statements:
Consolidated Balance Sheets as of December 31, 2011 and 2010		F-3
Consolidated Statements of Operations for the years ended December 31, 2011, 2010 and 2009		F-4
Consolidated Statements of Changes In Stockholders’ Equity for the years ended December  31, 2011, 2010 and 2009		F-5
Consolidated Statements of Cash Flows for the years ended December 31, 2011, 2010 and 2009		F-6
Notes to Consolidated Financial Statements		F-7
Schedule II - Valuation and Qualifying Accounts		S-1

F-1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders

    of Patterson-UTI Energy, Inc.:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Patterson-UTI Energy, Inc. and its subsidiaries (the “Company”) at December 31, 2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company's internal control over financial reporting based on our integrated 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 audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

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 (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) 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 (iii) 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.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 10, 2012

F-2

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
	2011			2010
	(In thousands, except share data)
ASSETS
Current assets:
Cash and cash equivalents	$	23,946		$	27,612
Accounts receivable, net of allowance for doubtful accounts of $4,887 and $5,114 at December 31, 2011 and 2010, respectively		518,109			337,167
Federal and state income taxes receivable		—			75,062
Inventory		31,306			17,215
Deferred tax assets, net		142,725			26,815
Assets held for sale		—			23,370
Other		48,864			50,169
Total current assets		764,950			557,410
Property and equipment, net		3,167,266			2,620,900
Goodwill and intangible assets		175,573			179,683
Deposits on equipment purchases		99,543			51,084
Other		14,569			13,954
Total assets	$	4,221,901		$	3,423,031
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	241,610		$	162,400
Federal and state income taxes payable		2,473			—
Accrued expenses		164,629			147,315
Current portion of long-term debt		10,000			6,250
Total current liabilities		418,712			315,965
Borrowings under revolving credit facility		110,000			—
Other long-term debt		382,500			392,500
Deferred tax liabilities, net		786,632			511,422
Other		7,426			15,537
Total liabilities		1,705,270			1,235,424
Commitments and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued		—			—
Common stock, par value $.01; authorized 300,000,000 shares with 183,295,350 and 181,537,568 issued and 155,807,779 and 154,193,754 outstanding at December 31, 2011 and 2010, respectively		1,833			1,815
Additional paid-in capital		840,731			796,641
Retained earnings		2,279,367			1,987,999
Accumulated other comprehensive income		19,459			21,597
Treasury stock, at cost, 27,487,571 shares and 27,343,814 shares at December 31, 2011 and 2010, respectively		(624,759	)		(620,445	)
Total stockholders’ equity		2,516,631			2,187,607
Total liabilities and stockholders’ equity	$	4,221,901		$	3,423,031

The accompanying notes are an integral part of these consolidated financial statements.

F-3

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

	Year Ended December 31,
	2011			2010			2009
	(In thousands, except per share data)
Operating revenues:
Contract drilling	$	1,669,581		$	1,081,898		$	599,287
Pressure pumping		845,803			350,608			161,441
Oil and natural gas		50,559			30,425			21,218
Total operating revenues		2,565,943			1,462,931			781,946
Operating costs and expenses:
Contract drilling		972,778			655,678			357,742
Pressure pumping		561,398			235,100			124,100
Oil and natural gas		9,615			7,020			7,341
Depreciation, depletion, amortization and impairment		437,279			333,493			289,847
Selling, general and administrative		64,271			53,042			43,935
Net (gain) loss on asset disposals		(4,999	)		(22,812	)		3,385
Provision for bad debts		—			(2,000	)		3,810
Acquisition-related expenses		—			2,485			—
Total operating costs and expenses		2,040,342			1,262,006			830,160
Operating income (loss)		525,601			200,925			(48,214	)
Other income (expense):
Interest income		187			1,674			381
Interest expense		(15,652	)		(12,772	)		(4,148	)
Other		582			927			426
Total other expense		(14,883	)		(10,171	)		(3,341	)
Income (loss) from continuing operations before income taxes		510,718			190,754			(51,555	)
Income tax expense (benefit):
Current		28,971			(74,634	)		(119,038	)
Deferred		158,967			147,490			101,443
Total income tax expense (benefit)		187,938			72,856			(17,595	)
Income (loss) from continuing operations		322,780			117,898			(33,960	)
Loss from discontinued operations, net of income taxes		(367	)		(956	)		(4,330	)
Net income (loss)	$	322,413		$	116,942		$	(38,290	)
Basic income (loss) per common share:
Income (loss) from continuing operations	$	2.08		$	0.77		$	(0.22	)
Loss from discontinued operations, net of income taxes	$	0.00		$	(0.01	)	$	(0.03	)
Net income (loss)	$	2.08		$	0.76		$	(0.25	)
Diluted income (loss) per common share:
Income (loss) from continuing operations	$	2.06		$	0.76		$	(0.22	)
Loss from discontinued operations, net of income taxes	$	0.00		$	(0.01	)	$	(0.03	)
Net income (loss)	$	2.06		$	0.76		$	(0.25	)
Weighted average number of common shares outstanding:
Basic		153,871			152,772			152,069
Diluted		155,304			153,276			152,069
Cash dividends per common share	$	0.20		$	0.20		$	0.20

The accompanying notes are an integral part of these consolidated financial statements.

F-4

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

	Common Stock						Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income			Treasury Stock			Total
	Number  of Shares			Amount
	(In thousands)
Balance, December 31, 2008		180,192		$	1,801		$	765,512		$	1,970,824		$	5,774		$	(616,969	)	$	2,126,942
Comprehensive income (loss):
Net loss		—			—			—			(38,290	)		—			—			(38,290	)
Foreign currency translation adjustment, (net of tax of $5,347)		—			—			—			—			9,222			—			9,222
Total comprehensive loss		—			—			—			(38,290	)		9,222			—			(29,068	)
Issuance of restricted stock		604			6			(6	)		—			—			—			—
Vesting of restricted stock units		6			—			—			—			—			—			—
Forfeitures of restricted stock		(56	)		—			—			—			—			—			—
Exercise of stock options		83			1			568			—			—			—			569
Stock-based compensation		—			—			18,565			—			—			—			18,565
Tax expense related to stock-based compensation		—			—			(3,004	)		—			—			—			(3,004	)
Payment of cash dividends		—			—			—			(30,681	)		—			—			(30,681	)
Purchase of treasury stock		—			—			—			—			—			(1,623	)		(1,623	)
Balance, December 31, 2009		180,829			1,808			781,635			1,901,853			14,996			(618,592	)		2,081,700
Comprehensive income:
Net Income		—			—			—			116,942			—			—			116,942
Foreign currency translation adjustment, (net of tax of $2,814)		—			—			—			—			6,601			—			6,601
Total comprehensive income		—			—			—			116,942			6,601			—			123,543
Issuance of restricted stock		700			7			(7	)		—			—			—			—
Vesting of restricted stock units		7			—			—			—			—			—			—
Forfeitures of restricted stock		(59	)		(1	)		1			—			—			—			—
Exercise of stock options		61			1			524			—			—			—			525
Stock-based compensation		—			—			16,779			—			—			—			16,779
Tax expense related to stock-based compensation		—			—			(2,291	)		—			—			—			(2,291	)
Payment of cash dividends		—			—			—			(30,796	)		—			—			(30,796	)
Purchase of treasury stock		—			—			—			—			—			(1,853	)		(1,853	)
Balance, December 31, 2010		181,538			1,815			796,641			1,987,999			21,597			(620,445	)		2,187,607
Comprehensive income:
Net income		—			—			—			322,413			—			—			322,413
Foreign currency translation adjustment		—			—			—			—			(2,138	)		—			(2,138	)
Total comprehensive income		—			—			—			322,413			(2,138	)		—			320,275
Issuance of restricted stock		782			8			(8	)		—			—			—			—
Vesting of restricted stock units		10			—			—			—			—			—			—
Forfeitures of restricted stock		(83	)		(1	)		1			—			—			—			—
Exercise of stock options		1,048			11			16,800			—			—			—			16,811
Stock-based compensation		—			—			20,904			—			—			—			20,904
Tax benefit related to stock-based compensation		—			—			6,393			—			—			—			6,393
Payment of cash dividends		—			—			—			(31,045	)		—			—			(31,045	)
Purchase of treasury stock		—			—			—			—			—			(4,314	)		(4,314	)
Balance, December 31, 2011		183,295		$	1,833		$	840,731		$	2,279,367		$	19,459		$	(624,759	)	$	2,516,631

The accompanying notes are an integral part of these consolidated financial statements.

F-5

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year Ended December 31,
	2011			2010			2009
	(In thousands)
Cash flows from operating activities:
Net income (loss)	$	322,413		$	116,942		$	(38,290	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment		437,279			333,493			289,847
Provision for bad debts		—			(2,000	)		3,810
Dry holes and abandonments		1,213			519			129
Deferred income tax expense		158,967			147,490			101,443
Stock-based compensation expense		20,904			16,779			18,214
Net (gain) loss on asset disposals		(4,999	)		(22,812	)		3,385
Tax expense related to stock-based compensation		—			(2,291	)		(3,004	)
Changes in operating assets and liabilities:
Accounts receivable		(183,165	)		(178,444	)		213,813
Income taxes receivable/payable		77,618			43,522			(108,664	)
Inventory and other assets		(13,491	)		(8,772	)		14,178
Accounts payable		41,995			49,576			(52,673	)
Accrued expenses		18,313			18,072			(21,178	)
Other liabilities		(8,111	)		3,234			(92	)
Net cash provided by (used in) operating activities of discontinued operations		(339	)		10,390			32,759
Net cash provided by operating activities		868,597			525,698			453,677
Cash flows from investing activities:
Acquisitions		—			(238,022	)		—
Purchases of property and equipment		(1,011,578	)		(738,090	)		(452,646	)
Proceeds from disposal of assets		22,495			29,409			3,359
Net cash provided by (used in) investing activities of discontinued operations		25,500			42,638			(54	)
Net cash used in investing activities		(963,583	)		(904,065	)		(449,341	)
Cash flows from financing activities:
Purchases of treasury stock		(4,314	)		(1,853	)		(1,623	)
Dividends paid		(31,045	)		(30,796	)		(30,681	)
Tax benefit related to stock-based compensation		6,393			—			—
Proceeds from long-term debt		—			400,000			—
Repayment of long-term debt		(6,250	)		(1,250	)		—
Proceeds from borrowings under revolving credit facility		153,100			200,000			—
Repayment of borrowings under revolving credit facility		(43,100	)		(200,000	)		—
Debt issuance costs		—			(10,779	)		(6,169	)
Proceeds from exercise of stock options		16,811			525			569
Net cash provided by (used in) financing activities		91,595			355,847			(37,904	)
Effect of foreign exchange rate changes on cash		(275	)		255			2,222
Net decrease in cash and cash equivalents		(3,666	)		(22,265	)		(31,346	)
Cash and cash equivalents at beginning of year		27,612			49,877			81,223
Cash and cash equivalents at end of year	$	23,946		$	27,612		$	49,877
Supplemental disclosure of cash flow information:
Net cash (paid) received during the year for:
Interest, net of capitalized interest of $8,415 in 2011, $2,288 in 2010 and $0 in 2009	$	(13,177	)	$	(2,220	)	$	1,804
Income taxes		59,251			115,666			14,029
Non-cash investing and financing activities:
Net increase (decrease) in payables for purchases of property and equipment	$	37,838		$	29,188		$	(25,110	)
Net (increase) decrease in deposits on equipment purchases		(48,459	)		(50,170	)		43,029

The accompanying notes are an integral part of these consolidated financial statements.

F-6

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Description of Business and Summary of Significant Accounting Policies

A description of the business and basis of presentation follows:

Description of business — Patterson-UTI Energy, Inc., through its wholly-owned subsidiaries (collectively referred to herein as “Patterson-UTI” or the “Company”), provides onshore contract drilling services to major and independent oil and natural gas operators primarily in Texas, New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, Pennsylvania, West Virginia, Ohio and western Canada. The Company provides pressure pumping services to oil and natural gas operators primarily in Texas and the Appalachian Basin. The Company also invests, on a non-operating working interest basis, in oil and natural gas properties.

Basis of presentation — The consolidated financial statements include the accounts of Patterson-UTI and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Except for wholly-owned subsidiaries, the Company has no controlling financial interests in any other entity which would require consolidation.

The U.S. dollar is the functional currency for all of the Company’s operations except for its Canadian operations, which use the Canadian dollar as its functional currency. The effects of exchange rate changes are reflected in accumulated other comprehensive income, which is a separate component of stockholders’ equity.

A summary of the significant accounting policies follows:

Management estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.

Revenue recognition — Revenues from daywork drilling and pressure pumping activities are recognized as services are performed. The Company follows the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and the risks therein, the Company follows the completed-contract method of accounting for such arrangements. Under this method, revenues and expenses related to a well-in-progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed total revenues. The Company recognizes as revenue reimbursements received from third parties for out-of-pocket expenses and accounts for those out-of-pocket expenses as direct costs. Except for two wells drilled under footage contacts in 2009, all of the wells the Company drilled in 2011, 2010 and 2009 were drilled under daywork contracts.

Accounts receivable — Trade accounts receivable are recorded at the invoiced amount. The allowance for doubtful accounts represents the Company’s estimate of the amount of probable credit losses existing in the Company’s accounts receivable. The Company reviews the adequacy of its allowance for doubtful accounts at least quarterly. Significant individual accounts receivable balances and balances which have been outstanding greater than 90 days are reviewed individually for collectability. Account balances, when determined to be uncollectable, are charged against the allowance.

Inventories — Inventories consist primarily of sand and chemical products to be used in conjunction with the Company’s pressure pumping activities. The inventories are stated at the lower of cost or market, determined by the first-in, first-out method.

F-7

Property and equipment — Property and equipment is carried at cost less accumulated depreciation. Depreciation is provided on the straight-line method over the estimated useful lives. The method of depreciation does not change whenever equipment becomes idle. The estimated useful lives, in years, are shown below:

	Useful Lives
Drilling rigs and other equipment		1.5-15
Buildings		15-20
Other		3-12

Long-lived assets, including property and equipment, are evaluated for impairment when certain triggering events or changes in circumstances indicate that the carrying values may not be recoverable over their estimated remaining useful life.

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. Costs of exploratory wells are initially capitalized to wells-in-progress until the outcome of the drilling is known. The Company reviews wells-in-progress quarterly to determine whether sufficient progress is being made in assessing the reserves and economic viability of the respective projects. If no progress has been made in assessing the reserves and economic viability of a project after one year following the completion of drilling, the Company considers the well costs to be impaired and recognizes the costs as expense. Geological and geophysical costs, including seismic costs, and costs to carry and retain undeveloped properties are charged to expense when incurred. The capitalized costs of both developmental and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves for each respective field.

The Company reviews its proved oil and natural gas properties for impairment whenever a triggering event occurs, such as downward revisions in reserve estimates or decreases in expected future oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are prepared based on management’s expectation of future pricing over the lives of the respective fields. These cash flow estimates are reviewed by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between net book value and discounted cash flow. The discounted cash flow estimates used in measuring impairment are based on management’s expectations of future commodity prices over the life of the respective field. The Company reviews unproved oil and natural gas properties quarterly to assess potential impairment. The Company’s impairment assessment is made on a lease-by-lease basis and considers factors such as management’s intent to drill, lease terms and abandonment of an area. If an unproved property is determined to be impaired, the related property costs are expensed.

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. The Company assesses impairment of its goodwill at least annually as of December 31, or on an interim basis if events or circumstances indicate that the fair value of goodwill may have decreased below its carrying value.

Maintenance and repairs — Maintenance and repairs are charged to expense when incurred. Renewals and betterments which extend the life or improve existing property and equipment are capitalized.

Disposals — Upon disposition of property and equipment, the cost and related accumulated depreciation are removed and any resulting gain or loss is reflected in the consolidated statement of operations.

Net income (loss) per common share — The Company provides a dual presentation of its net income (loss) per common share in its consolidated statements of operations: Basic net income (loss) per common share (“Basic EPS”) and diluted net income (loss) per common share (“Diluted EPS”).

F-8

Basic EPS excludes dilution and is computed by first allocating earnings between common stockholders and holders of non-vested shares of restricted stock. Basic EPS is then determined by dividing the earnings attributable to common stockholders by the weighted average number of common shares outstanding during the period, excluding non-vested shares of restricted stock.

Diluted EPS is based on the weighted average number of common shares outstanding plus the dilutive effect of potential common shares, including stock options, non-vested shares of restricted stock and restricted stock units. The dilutive effect of stock options and restricted stock units is determined using the treasury stock method. The dilutive effect of non-vested shares of restricted stock is based on the more dilutive of the treasury stock method or the two-class method, assuming a reallocation of undistributed earnings to common stockholders after considering the dilutive effect of potential common shares other than non-vested shares of restricted stock.

The following table presents information necessary to calculate income (loss) from continuing operations per share, loss from discontinued operations per share and net income (loss) per share for the years ended December 31, 2011, 2010 and 2009, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):

	2011			2010			2009
BASIC EPS:
Income (loss) from continuing operations	$	322,780		$	117,898		$	(33,960	)
Adjust for (income) loss attributed to holders of non-vested restricted stock		(2,545	)		(884	)		313
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Loss from discontinued operations, net	$	(367	)	$	(956	)	$	(4,330	)
Adjust for loss attributed to holders of non-vested restricted stock		3			7			38
Loss from discontinued operations attributed to common stockholders	$	(364	)	$	(949	)	$	(4,292	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Basic income (loss) from continuing operations per common share	$	2.08		$	0.77		$	(0.22	)
Basic loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Basic net income (loss) per common share	$	2.08		$	0.76		$	(0.25	)
DILUTED EPS:
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Add incremental earnings related to potential common shares		—			—			—
Adjusted income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Add dilutive effect of potential common shares		1,433			504			—
Weighted average number of diluted common shares outstanding		155,304			153,276			152,069
Diluted income (loss) from continuing operations per common share	$	2.06		$	0.76		$	(0.22	)
Diluted loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Diluted net income (loss) per common share	$	2.06		$	0.76		$	(0.25	)
Potentially dilutive securities excluded as anti-dilutive		1,641			4,164			8,090

F-9

Income taxes — The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for operating loss and tax credit carryforwards and 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 enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the enactment date. If applicable, a valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized. The Company’s policy is to account for interest and penalties with respect to income taxes as operating expenses.

Stock-based compensation — The Company recognizes the cost of share-based payments under the fair-value-based method. Under this method, compensation cost related to share-based payments is measured based on the estimated fair value of the awards at the date of grant, net of estimated forfeitures. This expense is recognized over the expected life of the awards (See Note 11).

Statement of cash flows — For purposes of reporting cash flows, cash and cash equivalents include cash on deposit and money market funds.

Recently Issued Accounting Standards — In September 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update that simplifies how entities test goodwill for impairment. This update permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. Previous guidance required an entity to test goodwill for impairment, on at least an annual basis, by comparing the fair value of a reporting unit with its carrying amount. If the fair value of a reporting unit is less than its carrying amount, then the second step of the test must be performed to measure the amount of the impairment loss, if any. Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. This update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted if an entity’s financial statements for the most recent annual or interim period have not yet been issued. The Company has elected to early adopt this accounting standard update as of December 31, 2011 as discussed further in Note 5.

In June 2011, the FASB issued an accounting standard update that requires that all non-owner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present total net income and its components followed consecutively by a second statement that should present total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. Historically, these components of other comprehensive income and total comprehensive income have been presented in the statement of changes in stockholders’ equity by many companies, including the Company. This requirement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will result in the addition of a new consolidated statement of comprehensive income to the Company’s consolidated financial statements beginning with the quarter ending March 31, 2012.

In May 2011, the FASB issued an accounting standard update to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with United States GAAP and International Financial Reporting Standards. The amendments in this update do not require additional fair value measurements, but provide additional guidance as to measuring fair value as well as certain additional disclosure requirements. The requirements in this update are effective during interim and annual periods beginning after December 15, 2011 and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will not have a material impact on the Company’s disclosures included in its consolidated financial statements.

F-10

2. Discontinued Operations

On January 20, 2010, the Company exited the drilling and completion fluids business, which had previously been presented as one of the Company’s reportable operating segments. On that date, the Company’s wholly owned subsidiary, Ambar Lone Star Fluid Services LLC, completed the sale of substantially all of its assets, excluding billed accounts receivable. The sales price was approximately $42.6 million. Upon the Company’s exit from the drilling and completion fluids business, the Company classified its drilling and completion fluids operating segment as a discontinued operation and an impairment loss was recognized in 2009 to reduce the carrying value of the assets to be disposed of to fair value less estimated costs to sell and no significant gain or loss was recognized in connection with the sale in 2010. The results of operations of this business have been reclassified and presented as results of discontinued operations for all periods presented in these consolidated financial statements.

On January 27, 2011, the stock of the Company’s electric wireline subsidiary, Universal Wireline, Inc., was sold in a cash transaction for $25.5 million. Except for inventory, the working capital of Universal Wireline, Inc. was excluded from the sale and retained by a subsidiary of the Company. Universal Wireline, Inc. was formed in 2010 to acquire the electric wireline business of Key Energy Services, Inc., as discussed in Note 3. The results of operations of this business have been presented as results of discontinued operations in these consolidated financial statements. As of December 31, 2010, the assets to be disposed of were classified as held for sale and are presented separately within current assets under the caption “Assets held for sale” in the consolidated balance sheet. Upon being classified as held for sale, the assets to be disposed of were recorded at fair value less estimated costs to sell resulting in a charge of $2.2 million. Due to the fact that the carrying value of the assets had been adjusted to net realizable value, no significant additional gain or loss was recognized in connection with the sale.

Summarized operating results from discontinued operations for the years ended December 31, 2011, 2010 and 2009 are shown below (in thousands):

	2011			2010			2009
Drilling and completion fluids revenues	$	—		$	3,737		$	79,786
Electric wireline revenues		1,104			5,712			—
Operating revenues from discontinued operations	$	1,104		$	9,449		$	79,786
Loss from discontinued operations before income taxes	$	(576	)	$	(1,499	)	$	(6,538	)
Income tax benefit		209			543			2,208
Loss from discontinued operations	$	(367	)	$	(956	)	$	(4,330	)

The components of assets held for sale at December 31, 2010 are shown below (in thousands):

Assets held for sale:
Inventory	$	756
Property and equipment, net		24,769
Reserve to reduce disposal group to fair value less costs to sell		(2,155	)
Total assets held for sale	$	23,370

3. Acquisitions

On October 1, 2010, two subsidiaries of the Company, Universal Pressure Pumping, Inc. and Universal Wireline, Inc., completed the acquisition of certain assets from Key Energy Pressure Pumping Services, LLC and Key Electric Wireline Services, LLC relating to the businesses of providing pressure pumping services and

F-11

electric wireline services to participants in the oil and natural gas industry. This acquisition expanded the Company’s pressure pumping operations to additional markets primarily in Texas. The aggregate purchase price was approximately $241 million and was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on fair value. The tangible assets acquired include property and equipment, inventories of sand and chemicals on hand and repair and maintenance supplies on hand. The identifiable intangible assets acquired include an agreement by the seller to not compete for a period of three years and the customer relationships in place at the time of the acquisition. The liabilities assumed arose from pricing agreements in place with certain customers that had pricing below current market rates. A related deferred tax asset was recognized to reflect the temporary difference associated with these below-market pricing arrangements. The excess of the purchase price over the fair values of the tangible assets, the identifiable intangible assets and deferred tax asset, net of the liabilities assumed, is recorded as goodwill and was attributed to the pressure pumping business acquired. A summary of the purchase price allocation follows (in thousands):

Sand and chemical inventory	$	6,848
Supplies		312
Property and equipment		154,359
Non-compete agreement		1,400
Customer relationships		25,500
Deferred tax asset		8,514
Goodwill		67,575
Below-market pricing agreements		(23,200	)
Total purchase price	$	241,308

In addition to the purchase price, acquisition-related expenses associated with this transaction of approximately $2.5 million were incurred by the Company and are presented in the consolidated statement of operations under the caption “acquisition-related expenses” for the year ended December 31, 2010. These expenses include certain legal and other professional fees directly related to the transaction, fees incurred in connection with title transfers of the acquired equipment and transition costs related to information technology.

As discussed in Note 2, the electric wireline business was classified as held for sale at December 31, 2010 and was subsequently sold on January 27, 2011. The results of operations of the wireline business from the date of acquisition through December 31, 2010 included revenue of $5.7 million and a pre-tax operating loss of $1.5 million (including a charge of approximately $2.2 million incurred to reduce the carrying value of the disposal group to its net realizable value) which is included in loss from discontinued operations for the year ended December 31, 2010. Results of operations of the acquired pressure pumping business are included in the Company’s consolidated results of operations from the date of acquisition. Revenues of $84.7 million and income from operations of $22.8 million from the acquired pressure pumping business are included in the consolidated statement of operations for the year ended December 31, 2010.

The following represents pro-forma unaudited financial information for the years ended December 31, 2010 and 2009 as if the acquisition had been completed on January 1, 2009 (in thousands, except per share amounts):

	2010		2009
	(Unaudited)
Revenue	$	1,660,635	$	905,168
Income (loss) from continuing operations	$	127,257	$	(46,807	)
Net income (loss)	$	126,301	$	(51,137	)
Basic income (loss) from continuing operations per common share	$	0.83	$	(0.33	)
Basic net income (loss) per common share	$	0.83	$	(0.36	)
Diluted income (loss) from continuing operations per common share	$	0.82	$	(0.33	)
Diluted net income (loss) per common share	$	0.82	$	(0.36	)

F-12

4. Property and Equipment

Property and equipment consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011			2010
Equipment	$	4,730,925		$	3,972,891
Oil and natural gas properties		131,812			110,749
Buildings		64,090			61,425
Land		11,467			11,074
		4,938,294			4,156,139
Less accumulated depreciation and depletion		(1,771,028	)		(1,535,239	)
Property and equipment, net	$	3,167,266		$	2,620,900

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2011, 2010 and 2009 (in millions):

	2011		2010		2009
Depreciation and impairment expense	$	419.2	$	322.3	$	280.6
Amortization expense		4.1		1.0		—
Depletion expense		14.0		10.2		9.2
Total	$	437.3	$	333.5	$	289.8

The Company evaluates the recoverability of its long-lived assets whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable (a “triggering event”). In light of adverse market conditions affecting the Company beginning in the fourth quarter of 2008 and continuing into 2009, including a substantial decrease in the operating levels of its contract drilling business segment and a significant decline in oil and natural gas commodity prices, the Company determined that a triggering event had occurred and deemed it necessary to perform an assessment with respect to impairment of long-lived assets, including property and equipment, within its contract drilling segment in 2009. In light of favorable trends in rig utilization and revenue per operating day experienced by the Company and its peers in 2010 and 2011, management concluded that no triggering event had occurred in 2010 or 2011 with respect to its contract drilling segment as a whole (excluding the rigs which had been removed from the Company’s marketable fleet as discussed below). The Company concluded that no triggering event occurred with respect to its pressure pumping segment in 2011, 2010 or 2009. With respect to the long-lived assets in the Company’s oil and natural gas exploration and production segment, the Company assesses the recoverability of long-lived assets at the end of each quarter due to revisions in its oil and natural gas reserve estimates and expectations about future commodity prices.

Long-lived assets are evaluated for impairment at the lowest level for which identifiable cash flows can be separated from other long-lived assets. The Company performs the first step of its impairment assessments by comparing the undiscounted cash flows for each long-lived asset or asset group to its respective carrying value. Based on the results of these impairment tests, the carrying amounts of long-lived assets in the contract drilling and oil and natural gas segments were determined to be recoverable, except as described below.

The Company’s analysis indicated that the carrying amounts of certain oil and natural gas properties were not recoverable at various testing dates in 2011, 2010 and 2009. The Company’s estimates of expected future net cash flows from impaired properties are used in measuring the fair value of such properties. The Company recorded impairment charges of $3.0 million, $792,000 and $3.7 million in 2011, 2010 and 2009, respectively, related to its oil and natural gas properties. The Company determined the fair value of the impaired assets using internally developed unobservable inputs including future pricing and reserves (level 3 inputs in the fair value hierarchy of fair value accounting).

F-13

On a periodic basis, the Company evaluates its fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type (such as drilling conventional vertical wells versus drilling longer horizontal wells using high capacity rigs). In connection with the Company’s ongoing planning process, it evaluated its then-current fleet of marketable drilling rigs in 2011, 2010 and 2009 and identified 53, four and 23 rigs, during each of those years respectively, that it determined were impaired and would no longer be marketed as rigs based on its assessment of estimated expenditures to bring these rigs into condition to operate in the current environment as well as its assessment of future demand and the suitability of the identified rigs in light of this expected demand. The components comprising these rigs were evaluated, and those components with continuing utility to the Company’s other marketed rigs were transferred to other rigs or to its yards to be used as spare equipment. The fair value of the remaining components of these rigs was estimated to be zero as there was no future cash flow expected and the associated net book value of $15.7 million in 2011, $4.2 million in 2010 and $10.5 million in 2009 was expensed in the Company’s consolidated statements of operations as an impairment charge.

During 2010, the Company sold certain rights to explore and develop zones deeper than depths that it generally targets for certain of the oil and natural gas properties in which it has working interests. The proceeds from this sale were approximately $22.3 million and the sale resulted in a gain on disposal of $20.1 million.

5. Goodwill and Intangible Assets

Goodwill — Goodwill by operating segment as of December 31, 2011 and 2010 and changes for the years then ended are as follows (in thousands):

	Contract Drilling		Pressure Pumping		Total
Balance December 31, 2009	$	86,234	$	—	$	86,234
Acquisition		—		67,575		67,575
Balance December 31, 2010		86,234		67,575		153,809
Changes to goodwill		—		—		—
Balance December 31, 2011	$	86,234	$	67,575	$	153,809

Goodwill was recorded in connection with a business combination in 2010 as a result of the Company’s acquisition of the pressure pumping business of Key Energy Services, Inc. on October 1, 2010, as discussed further in Note 3. Approximately $53.2 million of this goodwill is expected to be deductible for tax purposes. There were no accumulated impairment losses as of December 31, 2011 or 2010.

Goodwill is evaluated at least annually on December 31 to determine if the fair value of recorded goodwill has decreased below its carrying value. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. The Company’s reporting units for impairment testing have been determined to be its operating segments. Goodwill impairment is measured using a two-step impairment test. The first step is to compare the fair value of an entity’s reporting units to the respective carrying value of those reporting units. If the carrying value of a reporting unit exceeds its fair value the second step of the impairment test is performed whereby the fair value of the reporting unit is allocated to its identifiable tangible and intangible assets and liabilities with any remaining fair value representing the fair value of goodwill.

In connection with the Company’s annual goodwill impairment assessment as of December 31, 2010, the Company estimated its enterprise value based on the market capitalization of the Company as determined by reference to the closing price of the Company’s common stock during the fifteen days before and after year end. This enterprise value was allocated to the Company’s reporting units and it was determined that the fair values of the Company’s reporting units were in excess of their carrying value. As a result, the Company concluded that no impairment of goodwill was indicated as of December 31, 2010.

F-14

In September 2011, the FASB issued an accounting standards update which provides entities with the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test described above is unnecessary. The provisions of this accounting standards update are effective for goodwill impairment tests performed for fiscal years beginning after December 15, 2011, however, early adoption is permitted. The Company elected to adopt the provisions of the new goodwill impairment accounting standard issued in September 2011 in connection with its annual impairment assessment of goodwill as of December 31, 2011 and determined based on an assessment of qualitative factors that it was more likely than not that the fair values of the Company’s reporting units were greater than their carrying amounts and further testing was not necessary.

In making this determination, the Company considered the continued demand experienced during 2011 for its services in the contract drilling and pressure pumping businesses. The Company also considered the level of commodity prices for crude oil and natural gas, which influence its overall level of business activity in these operating segments. Additionally, current year operating results and forecasted operating results for the coming year were also taken into account. The Company’s overall market capitalization and the large amount of calculated excess of the fair values of the Company’s reporting units over their carrying values and lack of significant changes in the key assumptions from its 2010 quantitative Step 1 assessment of goodwill were also considered. The Company has undertaken extensive efforts in the past several years to upgrade its fleet of equipment and believes that it is positioned well from a competitive standpoint to satisfy demand for high technology drilling of unconventional horizontal wells which should help mitigate decreases in demand for drilling conventional vertical wells that may result from recent decreases in natural gas prices. In the event that market conditions weaken, the Company may be required to record an impairment of goodwill in its contract drilling or pressure pumping reporting units in the future, and such impairment could be material.

Intangible Assets — Intangible assets were recorded in the pressure pumping operating segment in connection with the fourth quarter 2010 acquisition of the assets of the pressure pumping business discussed in Note 3. As a result of the purchase price allocation, the Company recorded intangible assets related to a non-compete agreement and the customer relationships acquired. These intangible assets were recorded at fair value on the date of acquisition.

The non-compete agreement has a term of three years from October 1, 2010. The value of this agreement was estimated using a with and without scenario where cash flows were projected through the term of the agreement assuming the agreement is in place and compared to cash flows assuming the non-compete agreement was not in place. The intangible asset associated with the non-compete agreement is being amortized on a straight-line basis over the three-year term of the agreement. Amortization expense of $467,000 and $116,000 was recorded in the year ended December 31, 2011 and 2010, respectively, associated with the non-compete agreement.

The value of the customer relationships was estimated using a multi-period excess earnings model to determine the present value of the projected cash flows associated with the customers in place at the time of the acquisition and taking into account a contributory asset charge. The resulting intangible asset is being amortized on a straight-line basis over seven years. Amortization expense of $3.6 million and $910,000 was recorded in the year ended December 31, 2011 and 2010, respectively, associated with customer relationships.

F-15

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2011 and 2010 (in thousands):

	2011							2010
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Non-compete agreement	$	1,400	$	(583	)	$	817	$	1,400	$	(116	)	$	1,284
Customer relationships		25,500		(4,553	)		20,947		25,500		(910	)		24,590
Total intangible assets	$	26,900	$	(5,136	)	$	21,764	$	26,900	$	(1,026	)	$	25,874

6. Accrued Expenses

Accrued expenses consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011		2010
Salaries, wages, payroll taxes and benefits	$	58,692	$	39,866
Workers’ compensation liability		66,121		63,011
Property, sales, use and other taxes		11,850		6,682
Insurance, other than workers’ compensation		6,012		12,648
Accrued interest payable		4,937		4,879
Deferred revenue — current		7,229		10,220
2009 Performance Unit Awards		3,640		—
Other		6,148		10,009
	$	164,629	$	147,315

Deferred revenue was recorded in 2010 in the purchase price allocation associated with the Company’s acquisition of a pressure pumping business as discussed in Note 3. The deferred revenue relates to out-of-market pricing agreements that were in place at the acquired business at the time of the acquisition. The deferred revenue will be recognized as pressure pumping revenue over the remaining term of the pricing agreements. Deferred revenue of approximately $8.4 million and $6.1 million was recognized in the years ended December 31, 2011 and 2010, respectively, related to these pricing agreements.

7. Asset Retirement Obligation

The Company records a liability for the estimated costs to be incurred in connection with the abandonment of oil and natural gas properties in the future. This liability is included in the caption “other” in the liabilities section of the consolidated balance sheet. The following table describes the changes to the Company’s asset retirement obligations during 2011 and 2010 (in thousands):

	2011			2010
Balance at beginning of year	$	3,063		$	2,955
Liabilities incurred		361			335
Liabilities settled		(110	)		(339	)
Accretion expense		143			112
Revision in estimated costs of plugging oil and natural gas wells		(2	)		—
Asset retirement obligation at end of year	$	3,455		$	3,063

8. Long Term Debt

Credit Facilities — In March 2009, the Company entered into an unsecured revolving credit facility (the “2009 Credit Facility”) with a maximum borrowing capacity of $240 million. The Company incurred debt issuance costs of approximately $6.2 million during 2009 in connection with the 2009 Credit Facility. These costs were being amortized to interest expense over the contractual term of the 2009 Credit Facility.

F-16

On July 2, 2010, the Company entered into a 364-Day Credit Agreement (the “364-Day Credit Agreement”) with Wells Fargo Bank, N.A., as administrative agent and lender. The 364-Day Credit Agreement was a committed senior unsecured single draw term loan credit facility that permitted a borrowing of up to $250 million, provided that the loan must have been drawn no later than September 30, 2010 or, if an additional fee was paid, October 30, 2010. The maturity date under the 364-Day Credit Agreement was 364 days after the date on which the closing conditions under the 364-Day Credit Agreement were met. This facility was not drawn as of September 30, 2010 and it expired at that time.

On August 19, 2010, the Company entered into a Credit Agreement (the “Credit Agreement”) with Wells Fargo Bank, N.A., as administrative agent, letter of credit issuer, swing line lender and lender, and each of the other letter of credit issuer and lender parties thereto. The Credit Agreement is a committed senior unsecured credit facility that includes a revolving credit facility and a term loan facility. The Credit Agreement replaced the 2009 Credit Facility.

The revolving credit facility permits aggregate borrowings of up to $400 million and contains a letter of credit facility that is limited to $150 million and a swing line facility that is limited to $40 million. Subject to customary conditions, the Company may request that the lenders’ aggregate commitments with respect to the revolving credit facility be increased by up to $100 million, not to exceed total commitments of $500 million. The maturity date for the revolving facility is August 19, 2013.

The term loan facility provided for a loan of $100 million which was funded on August 19, 2010. The term loan facility is payable in quarterly principal installments commencing November 19, 2010. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments and 5.00% of the original principal amount for the next subsequent three quarterly installments, with the remainder becoming due at maturity. The maturity date for the term loan facility is August 19, 2014.

Loans under the Credit Agreement bear interest by reference, at the Company’s election, to the LIBOR rate or base rate. The applicable margin on LIBOR rate loans varies from 2.75% to 3.75% and the applicable margin on base rate loans varies from 1.75% to 2.75%, in each case determined based upon the Company’s debt to capitalization ratio. As of December 31, 2011, the applicable margin on LIBOR rate loans was 2.75% and the applicable margin on base rate loans was 1.75%. A letter of credit fee is payable by the Company equal to the applicable margin for LIBOR rate loans times the daily amount available to be drawn under outstanding letters of credit. The commitment fee payable to the lenders for the unused portion of the revolving credit facility varies from 0.50% to 0.75% based upon the Company’s debt to capitalization ratio and was 0.50% as of December 31, 2011.

Each domestic subsidiary of the Company other than any immaterial subsidiary has unconditionally guaranteed all existing and future indebtedness and liabilities of the Company and the other guarantors arising under the Credit Agreement and other loan documents. Such guarantees also cover obligations of the Company and any subsidiary of the Company arising under any interest rate swap contract with any person while such person is a lender or affiliate of a lender under the Credit Agreement.

The Credit Agreement contains customary representations, warranties, indemnities and affirmative and negative covenants. The Credit Agreement also requires compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 45% at any time. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period.

As of December 31, 2011, the Company had $92.5 million principal amount outstanding under the term loan facility at an interest rate of 3.25% and $110 million principal amount outstanding under the revolving credit

F-17

facility at a weighted average interest rate of 4.05%. The carrying value of the balances outstanding under the term loan facility and the revolving credit facility approximate fair value due to the frequency at which the interest rate resets. The Company had $40.6 million in letters of credit outstanding at December 31, 2011 and, as a result, had available borrowing capacity of approximately $249 million at that date.

Senior Notes — On October 5, 2010, the Company completed the issuance and sale of $300 million in aggregate principal amount of its 4.97% Series A Senior Notes due October 5, 2020 (the “Notes”) in a private placement. A portion of the proceeds from the Notes was used to repay a $200 million borrowing on the Company’s revolving credit facility, which had been drawn to fund a portion of the acquisition that closed on October 1, 2010 as discussed in Note 3. The fair value of the Notes at December 31, 2011 was approximately $316 million based on discounted cash flows associated with the Notes using current market rates of interest. The Notes are senior unsecured obligations of the Company which rank equally in right of payment with all other unsubordinated indebtedness of the Company. The Notes are guaranteed on a senior unsecured basis by each of the existing domestic subsidiaries of the Company other than immaterial subsidiaries.

The Notes bear interest at a rate of 4.97% per annum. The Company will pay interest on the Notes on April 5 and October 5 of each year. The Notes will mature on October 5, 2020. The Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the Notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreement. The Company must offer to prepay the Notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the Notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid Note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.

The note purchase agreement requires compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio for the four prior quarters of EBITDA to interest charges for that same period.

Events of default under the note purchase agreement and the Credit Agreement include failure to pay principal or interest when due, failure to comply with the financial and operational covenants, a cross default event, a judgment in excess of a threshold event, the guaranty agreement ceasing to be enforceable, the occurrence of certain ERISA events, a change of control event and bankruptcy and other insolvency events. If an event of default under the note purchase agreement occurs and is continuing, then holders of a majority in principal amount of the Notes have the right to declare all the Notes then-outstanding to be immediately due and payable. In addition, if the Company defaults in payments on any Note, then until such defaults are cured, the holder thereof may declare all the Notes held by it to be immediately due and payable.

The Company incurred approximately $10.8 million in debt issuance costs during 2010 in connection with the Credit Agreement and the Senior Notes discussed above. These costs were deferred and will be recognized as interest expense over the term of the underlying debt. Interest expense related to the amortization of debt issuance costs for the Credit Agreement and the Senior Notes was approximately $2.4 million and $1.1 million for the years ended December 31, 2011 and 2010, respectively.

F-18

Presented below is a schedule of the principal repayment requirements of long-term debt by fiscal year as of December 31, 2011 (in thousands):

Year ending December 31,
2012	$	10,000
2013		122,500
2014		70,000
2015		—
2016		—
Thereafter		300,000
Total	$	502,500

9. Commitments, Contingencies and Other Matters

Commitments — As of December 31, 2011, the Company maintained letters of credit in the aggregate amount of $40.6 million for the benefit of various insurance companies as collateral for retrospective premiums and retained losses which could become payable under the terms of the underlying insurance contracts. These letters of credit expire annually at various times during the year and are typically renewed. As of December 31, 2011, no amounts had been drawn under the letters of credit.

As of December 31, 2011, the Company had commitments to purchase approximately $352 million of major equipment for its drilling and pressure pumping businesses.

The Company’s pressure pumping business has entered into agreements to purchase minimum quantities of proppants from certain vendors. These agreements expire in 2013 and 2016. As of December 31, 2011, the remaining obligation under these agreements is approximately $42.5 million, of which materials with a total purchase price of approximately $13.5 million are expected to be delivered during 2012. In the event that the required minimum quantities are not purchased during any contract year, the Company would be required to make a liquidated damages payment to the respective vendor for any shortfall.

In November of 2011, the Company’s pressure pumping business entered into an agreement with a proppant vendor to advance, on a non-revolving basis, up to $12.0 million to such vendor to finance the construction of certain processing facilities. This advance is secured by the underlying processing facilities and bears interest at an annual rate of 5.0%. Repayment of the advance is to be made through discounts applied to purchases from the vendor and repayment of all amounts advanced must be made no later than October 1, 2017. As of December 31, 2011, advances of approximately $2.9 million had been made under this agreement and no significant repayments had been made.

Contingencies — The Company’s operations are subject to many hazards inherent in the contract drilling and pressure pumping businesses, including inclement weather, blowouts, well fires, loss of well control, pollution and reservoir damage. These hazards could cause personal injury or death, work stoppage, and serious damage to equipment and other property. The Company’s operations could also cause significant environmental and reservoir damages. These risks could expose the Company to substantial liability for personal injury, wrongful death, property damage, loss of oil and natural gas production, pollution and other environmental damages.

Any contractual right to indemnification that the Company may have for any such risk, may be unenforceable or limited due to negligent or willful acts of commission or omission by the Company, its subcontractors and/or suppliers. The Company’s customers may dispute, or be unable to meet, their contractual indemnification obligations to the Company due to financial, legal or other reasons. Accordingly, the Company may be unable to transfer these risks to its customers by contract or indemnification agreements. Incurring a liability for which the Company is not fully indemnified or insured could have a material adverse effect on its business, financial condition, cash flows and results of operations.

F-19

The Company has insurance coverage for comprehensive general liability, automobile liability, workers’ compensation and employer’s liability, and certain other specific risks. The Company has also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. For example, the Company generally maintains a $1.0 million per occurrence deductible on its workers’ compensation and equipment insurance coverages and a $2.0 million per occurrence self insured retention on its general liability insurance coverage. The Company self-insures a number of other risks, including loss of earnings and business interruption, and does not carry a significant amount of insurance to cover risks of underground reservoir damage. If a significant accident or other event occurs and is not fully covered by insurance or an enforceable or recoverable indemnity from a customer, it could have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations. Accrued expenses related to insurance claims are set forth in Note 6.

The Company is party to various legal proceedings arising in the normal course of its business. The Company does not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition, results of operations or cash flows.

Other Matters — The Company has Change in Control Agreements with its Chairman of the Board, Chief Executive Officer, two Senior Vice Presidents and its General Counsel (the “Key Employees”). Each Change in Control Agreement generally has an initial term with automatic twelve-month renewals unless the Company notifies the Key Employee at least ninety days before the end of such renewal period that the term will not be extended. If a change in control of the Company occurs during the term of the agreement and the Key Employee’s employment is terminated (i) by the Company other than for cause or other than automatically as a result of death, disability or retirement, or (ii) by the Key Employee for good reason (as those terms are defined in the Change in Control Agreements), then the Key Employee shall generally be entitled to, among other things:

• a bonus payment equal to the greater of the highest bonus paid after the Change in Control Agreement was entered into and the average of the two annual bonuses earned in the two fiscal years immediately preceding a change in control (such bonus payment prorated for the portion of the fiscal year preceding the termination date);

• a payment equal to 2.5 times (in the case of the Chairman of the Board and Chief Executive Officer), 2 times (in the case of the Senior Vice Presidents) or 1.5 times (in the case of the General Counsel) of the sum of (i) the highest annual salary in effect for such Key Employee and (ii) the average of the three annual bonuses earned by the Key Employee for the three fiscal years preceding the termination date; and

• continued coverage under the Company’s welfare plans for up to three years (in the case of the Chairman of the Board and Chief Executive Officer) or two years (in the case of the Senior Vice Presidents and General Counsel).

Each Change in Control Agreement provides the Key Employee with a full gross-up payment for any excise taxes imposed on payments and benefits received under the Change in Control Agreements or otherwise, including other taxes that may be imposed as a result of the gross-up payment.

F-20

10. Stockholders’ Equity

Cash Dividends — The Company paid cash dividends during the years ended December 31, 2009, 2010 and 2011 as follows:

	Per Share		Total
			(in thousands)
2009:
Paid on March 31, 2009	$	0.05	$	7,655
Paid on June 30, 2009		0.05		7,675
Paid on September 30, 2009		0.05		7,675
Paid on December 30, 2009		0.05		7,676
Total cash dividends	$	0.20	$	30,681
2010:
Paid on March 30, 2010	$	0.05	$	7,677
Paid on June 30, 2010		0.05		7,706
Paid on September 30, 2010		0.05		7,704
Paid on December 30, 2010		0.05		7,709
Total cash dividends	$	0.20	$	30,796
2011:
Paid on March 30, 2011	$	0.05	$	7,708
Paid on June 30, 2011		0.05		7,772
Paid on September 30, 2011		0.05		7,777
Paid on December 30, 2011		0.05		7,788
Total cash dividends	$	0.20	$	31,045

On February 1, 2012, the Company’s Board of Directors approved a cash dividend on its common stock in the amount of $0.05 per share to be paid on March 30, 2012 to holders of record as of March 15, 2012. The amount and timing of all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of the Company’s credit facilities and other factors.

On August 1, 2007, the Company’s Board of Directors approved a stock buyback program authorizing purchases of up to $250 million of the Company’s common stock in open market or privately negotiated transactions. During the year ended December 31, 2009, the Company purchased 5,715 shares of its common stock under the program at a cost of approximately $79,000. During the year ended December 31, 2010, the Company purchased 8,743 shares of its common stock under the program at a cost of approximately $123,000. During the year ended December 31, 2011, the Company purchased 8,689 shares of its common stock under the program at a cost of approximately $255,000. As of December 31, 2011, the Company is authorized to purchase approximately $113 million of the Company’s outstanding common stock under the program. Shares purchased under the program are accounted for as treasury stock.

The Company purchased 135,068, 117,083 and 114,983 shares of treasury stock from employees during 2011, 2010 and 2009, respectively. These shares were purchased at fair market value upon the vesting of restricted stock to provide the employees with the funds necessary to satisfy payroll tax withholding obligations. The total purchase price for these shares was approximately $4.1 million, $1.7 million and $1.5 million in 2011, 2010 and 2009, respectively. These purchases were made pursuant to the terms of the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (the “2005 Plan”) and not pursuant to the stock buyback program.

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11. Stock-based Compensation

The Company uses share-based payments to compensate employees and non-employee directors. The Company recognizes the cost of share-based payments under the fair-value-based method. Share-based awards consist of equity instruments in the form of stock options, restricted stock or restricted stock units and have included service and, in certain cases, performance conditions. The Company’s share-based awards also include both cash-settled and share-settled performance unit awards. Cash-settled performance unit awards are accounted for as liability awards. Share-settled performance unit awards are accounted for as equity awards. The Company issues shares of common stock when vested stock options are exercised, when restricted stock is granted and when restricted stock units and share-settled performance unit awards vest.

The Company’s shareholders have approved the 2005 Plan, and the Board of Directors adopted a resolution that no future grants would be made under any of the Company’s other previously existing plans. During 2010, the Company amended the 2005 Plan to, among other things, increase the total number of shares authorized for grant from 10,250,000 to 15,250,000. The Company’s share-based compensation plans at December 31, 2011 follow:

Plan Name	Shares Authorized for Grant		Awards Outstanding		Shares Available for Grant
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended		15,250,000		6,293,495		4,399,951
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended (“1997 Plan”)		—		1,983,300		—
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (“2001 Plan”)		—		35,800		—

A summary of the 2005 Plan follows:

• The Compensation Committee of the Board of Directors administers the plan.

• All employees including officers and directors are eligible for awards.

• The Compensation Committee determines the vesting schedule for awards. Awards typically vest over one year for non-employee directors and three years for employees.

• The Compensation Committee sets the term of awards and no option term can exceed 10 years.

• All options granted under the plan are granted with an exercise price equal to or greater than the fair market value of the Company’s common stock at the time the option is granted.

• The plan provides for awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards and dividend equivalents. As of December 31, 2011, non-incentive stock options, restricted stock awards, restricted stock units and performance unit awards had been granted under the plan.

Options granted under the 1997 Plan typically vested over three or five years as dictated by the Compensation Committee. These options have terms of no more than ten years. All options were granted with an exercise price equal to the fair market value of the related common stock at the time of grant. Restricted stock awards granted under the 1997 Plan typically vested over four years.

Options granted under the 2001 Plan typically vested over five years as dictated by the Compensation Committee. These options have terms of no more than ten years. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.

Stock Options — The Company estimates the grant date fair values of stock options using the Black-Scholes-Merton valuation model. Volatility assumptions are based on the historic volatility of the Company’s common stock over the most recent period equal to the expected term of the options as of the date the options are granted.

F-22

The expected term assumptions are based on the Company’s experience with respect to employee stock option activity. Dividend yield assumptions are based on the expected dividends at the time the options are granted. The risk-free interest rate assumptions are determined by reference to United States Treasury yields. Weighted-average assumptions used to estimate grant date fair values for stock options granted in the years ended December 31, 2011, 2010 and 2009 follow:

	2011			2010			2009
Volatility		45.97	%		45.98	%		49.90	%
Expected term (in years)		5.00			5.00			4.00
Dividend yield		0.67	%		1.35	%		1.67	%
Risk-free interest rate		2.34	%		2.47	%		1.67	%

Stock option activity for the year ended December 31, 2011 follows:

	Shares			Weighted-average exercise price
Outstanding at beginning of year		7,710,102		$	19.58
Granted		419,500		$	30.28
Exercised		(1,048,307	)	$	16.04
Cancelled		—		$	—
Expired		—		$	—
Outstanding at end of year		7,081,295		$	20.73
Exercisable at end of year		6,077,635		$	20.69

Options outstanding at December 31, 2011 have an aggregate intrinsic value of approximately $17.9 million and a weighted-average remaining contractual term of 5.3 years. Options exercisable at December 31, 2011 have an aggregate intrinsic value of approximately $14.6 million and a weighted-average remaining contractual term of 4.8 years. Additional information with respect to options granted, vested and exercised during the years ended December 31, 2011, 2010 and 2009 follows:

	2011		2010		2009
Weighted-average grant date fair value of stock options granted (per share)	$	12.24	$	5.69	$	4.71
Grant date fair value of stock options vested during the year (in thousands)	$	5,639	$	5,553	$	6,973
Aggregate intrinsic value of stock options exercised (in thousands)	$	12,663	$	523	$	510

As of December 31, 2011, options to purchase 1,003,660 shares were outstanding and not vested. All of these non-vested options are expected to ultimately vest. Additional information as of December 31, 2011 with respect to these non-vested options follows:

Aggregate intrinsic value	$3.3 million
Weighted-average remaining contractual term	8.56 years
Weighted-average remaining expected term	3.45 years
Weighted-average remaining vesting period	1.52 years
Unrecognized compensation cost	$6.7 million

Restricted Stock — For all restricted stock awards to date, shares of common stock were issued when the awards were made. Non-vested shares are subject to forfeiture for failure to fulfill service conditions and, in certain cases, performance conditions. Non-forfeitable dividends are paid on non-vested shares of restricted stock. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period.

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Restricted stock activity for the year ended December 31, 2011 follows:

	Shares			Weighted- average Grant Date Fair Value
Non-vested restricted stock outstanding at beginning of year		1,114,051		$	16.05
Granted		782,300		$	30.46
Vested		(599,394	)	$	17.60
Forfeited		(83,158	)	$	22.58
Non-vested restricted stock outstanding at end of year		1,213,799		$	24.13

As of December 31, 2011, approximately 1.1 million shares of non-vested restricted stock outstanding are expected to vest. Additional information as of December 31, 2011 with respect to these non-vested shares follows:

Aggregate intrinsic value	$22.6 million
Weighted-average remaining vesting period	1.90 years
Unrecognized compensation cost	$22.6 million

Restricted Stock Units — For all restricted stock unit awards made to date, shares of common stock are not issued until the units vest. Restricted stock units are subject to forfeiture for failure to fulfill service conditions. Non-forfeitable cash dividend equivalents are paid on non-vested restricted stock units.

Restricted stock unit activity for the year ended December 31, 2011 follows:

	Shares			Weighted Average Grant Date Fair Value
Non-vested restricted stock units outstanding at beginning of year		17,834		$	19.73
Granted		10,000		$	30.63
Vested		(10,333	)	$	23.94
Forfeited		—		$	—
Non-vested restricted stock units outstanding at end of year		17,501		$	23.47

Performance Unit Awards. In 2009, the Company granted cash-settled performance unit awards to certain executive officers (the “2009 Performance Units”). The 2009 Performance Units provide for those executive officers to receive a cash payment upon the achievement of certain performance goals established by the Compensation Committee during a specified period. The performance period for the 2009 Performance Units is the period from April 1, 2009 through March 31, 2012, but can extend through March 31, 2014 in certain circumstances. The performance goals for the 2009 Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee of the Board of Directors. These goals are considered to be market conditions under the relevant accounting standards and the market conditions are factored into the determination of the fair value of the performance units. Generally, the recipients will receive a base payment if the Company’s total shareholder return is positive and, when compared to the peer group, is at or above the 25^th percentile but less than the 50^th percentile, two times the base if at or above the 50^th percentile but less than the 75^th percentile, and four times the base if at the 75^th percentile or higher. The total base amount with respect to the 2009 Performance Units is approximately $1.7 million. Because the 2009 Performance Units are to be settled in cash at the end of the performance period, they are accounted for as liability awards and the Company’s pro-rated obligation is measured at estimated fair value at the end of each reporting period using a Monte Carlo simulation model. As of December 31, 2011 this pro-rated obligation was approximately $3.6 million and is included in the caption “accrued expenses” in the liabilities section of the consolidated balance sheet. Compensation expense associated with the 2009 Performance Units was approximately $1.3 million, $1.5 million and $859,000 for the years ended December 31, 2011, 2010 and 2009, respectively.

F-24

In 2010 and 2011, the Company granted stock-settled performance unit awards to certain executive officers (the “2010 Performance Units” and the “2011 Performance Units”, respectively). The 2010 Performance Units and the 2011 Performance Units provide for those executive officers to receive a grant of shares of stock upon the achievement of certain performance goals established by the Compensation Committee during a specified period. The performance period for the 2010 Performance Units is the period from April 1, 2010 through March 31, 2013, but can extend through March 31, 2015 in certain circumstances. The performance period for the 2011 Performance Units is the period from April 1, 2011 through March 31, 2014, but can extend through March 31, 2016 in certain circumstances. The performance goals for the 2010 Performance Units and the 2011 Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee of the Board of Directors. These goals are considered to be market conditions under the relevant accounting standards and the market conditions are factored into the determination of the fair value of the respective performance units. Generally, the recipients will receive a base number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 25^th percentile, two times the base if at the 50^th percentile, and four times the base if at the 75^th percentile or higher. The grant of shares when achievement is between the 25^th and 75^th percentile will be determined on a pro-rata basis. The total base number of shares with respect to the 2010 Performance Units is 89,375 shares and the total base number of shares with respect to the 2011 Performance Units is 72,188 shares. Because the 2010 and 2011 Performance Units are stock-settled awards, they are accounted for as equity awards and measured at fair value on the date of grant using a Monte Carlo simulation model. The fair value of the 2010 Performance Units as of the date of grant was approximately $3.1 million and the fair value of the 2011 Performance Units as of the date of grant was approximately $5.6 million. This fair value is recognized on a straight-line basis over the performance period. Compensation expense associated with the 2010 Performance Units was approximately $1.0 million and $779,000 for the years ended December 31, 2011 and 2010, respectively. Compensation expense associated with the 2011 Performance Units was approximately $1.4 million for the year ended December 31, 2011.

Dividends on Equity Awards — Non-forfeitable cash dividends and dividend equivalents paid on equity awards are recognized as follows:

• Dividends are recognized as reductions of retained earnings for the portion of restricted stock awards expected to vest.

• Dividends are recognized as additional compensation cost for the portion of restricted stock awards that are not expected to vest or that ultimately do not vest.

• Dividend equivalents are recognized as additional compensation cost for restricted stock units.

12. Leases

The Company incurred rent expense of $35.0 million, $18.1 million and $11.9 million for the years 2011, 2010 and 2009, respectively. Rent expense is primarily related to short-term equipment rentals that are generally passed through to customers. The Company’s obligations under non-cancelable operating lease agreements are not material to its operations or cash flows.

F-25

13. Income Taxes

Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2011, 2010 and 2009 are as follows (in thousands):

	2011			2010			2009
Federal income tax expense (benefit):
Current	$	16,336		$	(77,310	)	$	(117,493	)
Deferred		146,842			145,198			103,574
		163,178			67,888			(13,919	)
State income tax expense (benefit):
Current		6,056			19			(1,883	)
Deferred		13,196			3,246			(1,875	)
		19,252			3,265			(3,758	)
Foreign income tax expense (benefit):
Current		6,579			2,657			338
Deferred		(1,071	)		(954	)		(256	)
		5,508			1,703			82
Total income tax expense (benefit):
Current		28,971			(74,634	)		(119,038	)
Deferred		158,967			147,490			101,443
Total income tax expense (benefit)	$	187,938		$	72,856		$	(17,595	)

The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2011, 2010 and 2009 is summarized as follows:

	2011			2010			2009
Statutory tax rate		35.0	%		35.0	%		35.0	%
State income taxes		2.5			1.1			4.7
Permanent differences		(0.1	)		2.3			(5.7	)
Other, net		(0.6	)		(0.2	)		0.1
Effective tax rate		36.8	%		38.2	%		34.1	%

The Domestic Production Activities Deduction was enacted as part of the American Jobs Creation Act of 2004 (as revised by the Emergency Economic Stabilization Act of 2008,) and allows a deduction of 6% in 2009 and 9% in 2010 and thereafter on the lesser of qualified production activities income or taxable income. The permanent differences for 2010 and 2009 reflect the recapture of a portion of this deduction due to the carryback of the 2010 and 2009 net operating losses to prior years. This recapture resulted in a negative effective rate impact in 2009 due to the Company having a loss before income taxes in that year. The permanent difference for 2011 does not include any deduction as it is limited to taxable income and the Company had a tax loss in 2011.

F-26

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):

	December 31, 2011			Net Change			December 31, 2010			Net Change			December 31, 2009			Net Change			December 31, 2008
Deferred tax assets:
Current:
Net operating loss carryforwards	$	114,576		$	114,576		$	—		$	—		$	—		$	—		$	—
Workers’ compensation allowance		24,004			714			23,290			(1,334	)		24,624			(1,360	)		25,984
Other		18,800			146			18,654			(962	)		19,616			(2,735	)		22,351
		157,380			115,436			41,944			(2,296	)		44,240			(4,095	)		48,335
Non-current:
Net operating loss carryforwards		18,434			11,969			6,465			1,593			4,872			4,872			—
Expense associated with employee stock options		12,728			1,476			11,252			2,123			9,129			2,500			6,629
Federal benefit of foreign deferred tax liabilities		—			—			—			(9,160	)		9,160			(256	)		9,416
Federal benefit of state deferred tax liabilities		20,260			7,105			13,155			3,383			9,772			2,702			7,070
Other		10,670			(5,361	)		16,031			6,546			9,485			4,120			5,365
		62,092			15,189			46,903			4,485			42,418			13,938			28,480
Total deferred tax assets		219,472			130,625			88,847			2,189			86,658			9,843			76,815
Deferred tax liabilities:
Current:
Other		(14,655	)		474			(15,129	)		(3,766	)		(11,363	)		1,044			(12,407	)
Non-current:
Property and equipment basis difference		(835,823	)		(289,168	)		(546,655	)		(133,542	)		(413,113	)		(110,786	)		(302,327	)
Other		(12,901	)		(1,231	)		(11,670	)		(709	)		(10,961	)		(7,091	)		(3,870	)
		(848,724	)		(290,399	)		(558,325	)		(134,251	)		(424,074	)		(117,877	)		(306,197	)
Total deferred tax liabilities		(863,379	)		(289,925	)		(573,454	)		(138,017	)		(435,437	)		(116,833	)		(318,604	)
Net deferred tax liability	$	(643,907	)	$	(159,300	)	$	(484,607	)	$	(135,828	)	$	(348,779	)	$	(106,990	)	$	(241,789	)

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. The Company expects the deferred tax assets at December 31, 2011 and 2010 to be realized as a result of the reversal of existing taxable temporary differences giving rise to deferred tax liabilities and the generation of taxable income; therefore, no valuation allowance is considered necessary.

F-27

Other deferred tax assets consist primarily of the tax effect of various allowance accounts and tax-deferred expenses expected to generate future tax benefits of approximately $29.5 million. Other deferred tax liabilities consist primarily of the tax effect of receivables from insurance companies and tax-deferred income not yet recognized for tax purposes.

For income tax purposes, the Company generated approximately $327 million of federal net operating losses and approximately $136 million of state net operating losses during the year ended December 31, 2011. Of these amounts, approximately $11.1 million will be carried back to prior years, and the remaining balance can be carried forward to future years along with prior year carryovers in the amount of $118 million. Net operating losses that can be carried forward, if unused, are scheduled to expire as follows: 2014 — $9.6 million; 2015 — $12.9 million; 2016 — $8.2 million; 2018 — $2.4 million; 2028 — $15.3 million; 2029 — $59.8 million; 2030 — $35.7 million and 2031 — $426 million.

As of December 31, 2011, the Company had no unrecognized tax benefits. The Company has established a policy to account for interest and penalties related to uncertain income tax positions as operating expenses. As of December 31, 2011, the tax years ended December 31, 2008 through December 31, 2010 are open for examination by U.S. taxing authorities. As of December 31, 2011, the tax years ended December 31, 2007 through December 31, 2010 are open for examination by Canadian taxing authorities.

On January 1, 2010, the Company converted its Canadian operations from a Canadian branch to a controlled foreign corporation for federal income tax purposes. Because the statutory tax rates in Canada are lower than those in the United States, this transaction triggered a $5.1 million reduction in deferred tax liabilities, which is being amortized as a reduction to deferred income tax expense over the weighted average remaining useful life of the Canadian assets.

As a result of the above conversion, the Company’s Canadian assets are no longer directly subject to United States taxation, provided that the related unremitted earnings are permanently reinvested in Canada. Effective January 1, 2010, the Company has elected to permanently reinvest these unremitted earnings in Canada, and intends to do so for the foreseeable future. As a result, no deferred United States federal or state income taxes have been provided on such unremitted foreign earnings, which totaled approximately $25.2 million as of December 31, 2011.

14. Employee Benefits

The Company maintains a 401(k) plan for all eligible employees. The Company’s operating results include expenses of approximately $4.6 million in 2011, $3.1 million in 2010 and $2.8 million in 2009 for the Company’s cash contributions to the plan.

15. Business Segments

The Company’s revenues, operating profits and identifiable assets are primarily attributable to three business segments: (i) contract drilling of oil and natural gas wells, (ii) pressure pumping services and (iii) the investment, on a non-operating working interest basis, in oil and natural gas properties. Each of these segments represents a distinct type of business. These segments have separate management teams which report to the Company’s chief operating decision maker. The results of operations in these segments are regularly reviewed by the chief operating decision maker for purposes of determining resource allocation and assessing performance. As discussed in Note 2, in January 2010, the Company exited the drilling and completion fluids services business which previously was reported as a business segment. Operating results for that business for the years ended December 31, 2010 and 2009 are presented as discontinued operations in the consolidated statements of operations. Also included in discontinued operations for the year ended December 31, 2011 and 2010 are the operating results for an electric wireline business that was acquired on October 1, 2010 and sold in January 2011.

Contract Drilling — The Company markets its contract drilling services to major and independent oil and natural gas operators. As of December 31, 2011, the Company had 328 marketable land-based drilling rigs, of which 64 were based in west Texas and southeastern New Mexico; 73 in north central and east Texas, northern

F-28

Louisiana and Mississippi; 48 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota); 62 in south Texas and southern Louisiana; 27 in the Texas panhandle, Oklahoma and Arkansas; 34 in the Appalachian Basin and 20 in western Canada.

For the years ended December 31, 2011, 2010 and 2009, contract drilling revenue earned in Canada was $106 million, $65.7 million and $45.4 million, respectively. Additionally, long-lived assets within the contract drilling segment located in Canada totaled $69.8 million and $70.7 million as of December 31, 2011 and 2010, respectively.

Pressure Pumping — The Company provides pressure pumping services to oil and natural gas operators primarily in Texas and the Appalachian Basin. Pressure pumping services are primarily well stimulation and cementing for the completion of new wells and remedial work on existing wells. Well stimulation involves processes inside a well designed to enhance the flow of oil, natural gas, or other desired substances from the well. Cementing is the process of inserting material between the hole and the pipe to center and stabilize the pipe in the hole.

Oil and Natural Gas — The Company owns and invests in oil and natural gas assets as a non-operating working interest owner. The Company’s oil and natural gas interests are located primarily in Texas and New Mexico.

F-29

The following tables summarize selected financial information relating to the Company’s business segments (in thousands):

	Years Ended December 31,
	2011			2010			2009
Revenues:
Contract drilling	$	1,673,629		$	1,085,722		$	600,423
Pressure pumping		845,803			350,608			161,441
Oil and natural gas		50,559			30,425			21,218
Total segment revenues		2,569,991			1,466,755			783,082
Elimination of intercompany revenues(a)		(4,048	)		(3,824	)		(1,136	)
Total revenues	$	2,565,943		$	1,462,931		$	781,946
Income (loss) from continuing operations before income taxes:
Contract drilling	$	346,083		$	140,483		$	(11,219	)
Pressure pumping		193,440			62,194			1,017
Oil and natural gas		23,982			12,455			950
		563,505			215,132			(9,252	)
Corporate and other		(42,903	)		(37,019	)		(35,577	)
Net (loss) gain on asset disposals(b)		4,999			22,812			(3,385	)
Interest income		187			1,674			381
Interest expense		(15,652	)		(12,772	)		(4,148	)
Other		582			927			426
Income (loss) from continuing operations before income taxes	$	510,718		$	190,754		$	(51,555	)
Identifiable assets:
Contract drilling	$	3,252,116		$	2,678,250		$	2,129,567
Pressure pumping		748,643			533,597			213,094
Oil and natural gas		44,990			36,508			25,355
Corporate and other(c)		176,152			174,676			294,136
Total assets	$	4,221,901		$	3,423,031		$	2,662,152
Depreciation, depletion, amortization and impairment:
Contract drilling	$	344,312		$	280,458		$	248,424
Pressure pumping		73,279			40,724			27,589
Oil and natural gas		16,962			10,950			12,927
Corporate and other		2,726			1,361			907
Total depreciation, depletion, amortization and impairment	$	437,279		$	333,493		$	289,847
Capital expenditures:
Contract drilling	$	784,686		$	655,550		$	395,376
Pressure pumping		198,061			51,064			43,144
Oil and natural gas		22,884			23,067			7,341
Corporate and other		5,947			8,409			6,785
Total capital expenditures	$	1,011,578		$	738,090		$	452,646

(a) Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.

F-30

(b) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

(c) Corporate and other assets primarily include identifiable assets associated with assets held for sale as well as cash on hand, income taxes receivable and certain deferred federal income tax assets.

16. Concentrations of Credit Risk

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of demand deposits, temporary cash investments and trade receivables.

The Company believes it has placed its demand deposits and temporary cash investments with high credit-quality financial institutions. At December 31, 2011 and 2010, the Company’s demand deposits and temporary cash investments consisted of the following (in thousands):

	2011			2010
Deposits in FDIC and SIPC-insured institutions under insurance limits	$	289		$	1,523
Deposits in FDIC and SIPC-insured institutions over insurance limits		50,035			51,625
Deposits in foreign banks		18,823			11,533
		69,147			64,681
Less outstanding checks and other reconciling items		(45,201	)		(37,069	)
Cash and cash equivalents	$	23,946		$	27,612

Concentrations of credit risk with respect to trade receivables are primarily focused on companies involved in the exploration and development of oil and natural gas properties. The concentration is somewhat mitigated by the diversification of customers for which the Company provides services. As is general industry practice, the Company typically does not require customers to provide collateral. No significant losses from individual customers were experienced during the years ended December 31, 2011, 2010 or 2009. No provision for bad debts was recognized in 2011. The Company recorded a provision for bad debts for 2010 and 2009 of $(2.0) million and $3.8 million, respectively.

17. Fair Values of Financial Instruments

The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items.

The estimated fair value of the Company’s outstanding debt balances (including current portion) as of December 31, 2011 and 2010 is set forth below (in thousands):

	December 31, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Borrowings under Credit Agreement:
Revolving credit facility	$	110,000	$	110,000	$	—	$	—
Term loan facility		92,500		92,500		98,750		98,750
Senior Notes		300,000		315,942		300,000		289,625
Total debt	$	502,500	$	518,442	$	398,750	$	388,375

The carrying value of the balance outstanding under the term loan facility and revolving credit facility approximates fair value as both facilities have a floating interest rate that adjusts at each quarterly interest payment date. The fair value of the 4.97% Series A Senior Notes at December 31, 2011 and 2010 is based on discounted cash flows associated with the Senior Notes using current market rates of interest at those respective dates. These fair value estimates are based on observable market inputs and are considered level 2 fair value estimates in the fair value hierarchy of fair value accounting.

F-31

18. Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2010
Operating revenues	$	271,598		$	306,992	$	378,663	$	505,678
Operating income		7,831			45,757		52,509		94,828
Income from continuing operations, net of income taxes		4,186			29,528		29,374		54,810
Loss from discontinued operations, net of income taxes		—			—		—		(956	)
Net income		4,186			29,528		29,374		53,854
Basic income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.36
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
Diluted income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.35
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
2011
Operating revenues	$	567,404		$	600,064	$	673,828	$	724,647
Operating income		117,547			131,860		132,294		143,900
Income from continuing operations, net of income taxes		71,619			81,638		81,928		87,595
Loss from discontinued operations, net of income taxes		(367	)		—		—		—
Net income		71,252			81,638		81,928		87,595
Basic income (loss) per common share:
From continuing operations	$	0.46		$	0.53	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.53	$	0.53	$	0.56
Diluted income (loss) per common share:
From continuing operations	$	0.46		$	0.52	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.52	$	0.53	$	0.56

As discussed in Note 2, the Company exited the drilling and completion fluids services business in January 2010 and sold a recently acquired wireline business in January 2011. The results of operations related to those businesses have been reclassified and presented as discontinued operations in the quarterly financial information above.

F-32

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

Description	Beginning Balance		Charged to Costs and Expenses			Deductions(1)		Ending Balance
	(In thousands)
Year Ended December 31, 2011
Deducted from asset accounts:
Allowance for doubtful accounts	$	5,114	$	0		$	227	$	4,887
Year Ended December 31, 2010
Deducted from asset accounts:
Allowance for doubtful accounts	$	10,911	$	(2,000	)	$	3,797	$	5,114
Year Ended December 31, 2009
Deducted from asset accounts:
Allowance for doubtful accounts	$	9,330	$	4,700		$	3,119	$	10,911

(1) Consists of uncollectible accounts written off.

S-1

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Patterson-UTI Energy, Inc. has duly caused this Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

PATTERSON-UTI ENERGY, INC.
By:	/s/ Douglas J. Wall
	Douglas J. Wall
	President and Chief Executive Officer

Date: February 10, 2012

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report on Form 10-K has been signed by the following persons on behalf of Patterson-UTI Energy, Inc. and in the capacities indicated as of February 10, 2012.

Signature	Title
/s/ Mark S. Siegel	Chairman of the Board
Mark S. Siegel
/s/ Douglas J. Wall	President and Chief Executive Officer
Douglas J. Wall
(Principal Executive Officer)
/s/ John E. Vollmer III	Senior Vice President — Corporate Development,
John E. Vollmer III	Chief Financial Officer and Treasurer
(Principal Financial Officer)
/s/ Gregory W. Pipkin	Chief Accounting Officer and
Gregory W. Pipkin	Assistant Secretary
(Principal Accounting Officer)
/s/ Kenneth N. Berns	Senior Vice President and Director
Kenneth N. Berns
/s/ Charles O. Buckner	Director
Charles O. Buckner
/s/ Curtis W. Huff	Director
Curtis W. Huff
/s/ Terry H. Hunt	Director
Terry H. Hunt
/s/ Kenneth R. Peak	Director
Kenneth R. Peak
/s/ Cloyce A. Talbott	Director
Cloyce A. Talbott

EXHIBIT INDEX

2.1	Asset Purchase Agreement dated July 2, 2010 by and among Patterson-UTI Energy, Inc., Portofino Acquisition Company (n/k/a Universal Pressure Pumping, Inc.), Key Energy Pressure Pumping Services, LLC, Key Electric Wireline Services, LLC and Key Energy Services, Inc. (filed July 6, 2010 as Exhibit 2.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
2.2	Letter Agreement dated September 1, 2010 by and among Patterson-UTI Energy, Inc., Universal Pressure Pumping, Inc., Universal Wireline, Inc., Key Energy Services, Inc., Key Energy Pressure Pumping Services, LLC, and Key Electric Wireline Services LLC (filed November 1, 2010 as Exhibit 2.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2010 and incorporated herein by reference).
2.3	Letter Agreement dated October 1, 2010 by and among Patterson-UTI Energy, Inc., Universal Pressure Pumping, Inc., Universal Wireline, Inc., Key Energy Services, Inc., Key Energy Pressure Pumping Services, LLC, and Key Electric Wireline Services LLC (filed November 1, 2010 as Exhibit 2.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2010 and incorporated herein by reference).
3.1	Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
3.2	Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
3.3	Certificate of Elimination with respect to Series A Participating Preferred Stock (filed October 27, 2011 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
3.4	Second Amended and Restated Bylaws (filed August 6, 2007 as Exhibit 3.3 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2007 and incorporated herein by reference).
4.1	Restated Certificate of Incorporation, as amended (See Exhibits 3.1, 3.2 and 3.3).
4.2	Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned to REMY Capital Partners III, L.P. (filed March 19, 2002 as Exhibit 4.3 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
10.1	For additional material contracts, see Exhibit 4.2.
10.2	Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27, 2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company's Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
10.3	Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as Exhibit 4.7 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
10.4	Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed August 9, 2004 as Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
10.5	Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock Option Agreement (filed June 21, 2005 as Exhibit 10.1 to the Company's Current Report on Form 8-K, and incorporated herein by reference).*
10.6	First Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).

10.7	Second Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
10.8	Third Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed April 27, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*
10.9	Fourth Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed April 27, 2010 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*
10.10	Fifth Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed August 2, 2010 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference).*
10.11	Form of Cash-Settled Performance Unit Award Agreement pursuant to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended from time to time (filed February 19, 2010 as Exhibit 10.9 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference).*
10.12	Form of Amendment to Cash-Settled Performance Unit Award Agreement under the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed May 4, 2010 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2010 and incorporated herein by reference).*
10.13	Form of Share-Settled Performance Unit Award Agreement under the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed August 2, 2010 as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2010 and incorporated herein by reference).*
10.14	Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed on February 25, 2005 as Exhibit 10.23 to the Company's Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*
10.15	Letter Agreement dated February 6, 2006 between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed May 1, 2006 as Exhibit 10.25 to the Company’s Annual Report on Form 10-K, as amended, and incorporated herein by reference).*
10.16	Employment Agreement, dated as of September 1, 2007 between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed on September 24, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference).*
10.17	Employment Agreement, effective as of January 1, 2012, by and between Patterson-UTI Drilling Company LLC and James M. Holcomb.*+
10.18	Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Cloyce A. Talbott, Douglas J. Wall, Kenneth N. Berns, Curtis W. Huff, Terry H. Hunt, Kenneth R. Peak, Charles O. Buckner, John E. Vollmer III, Seth D. Wexler and Gregory W. Pipkin (filed April 28, 2004 as Exhibit 10.11 to the Company's Annual Report on Form 10-K, as amended, for the year ended December 31, 2003 and incorporated herein by reference).*
10.19	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.20	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of August 31, 2007, by and between Patterson-UTI Energy, Inc. and Douglas J. Wall (filed September 4, 2007 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).*

10.21	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.22	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
10.23	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Mark S. Siegel, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.24	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Douglas J. Wall, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.9 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.25	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and John E. Vollmer, III, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.10 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.26	First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Kenneth N. Berns, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.11 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*
10.27	Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of November 2, 2009, by and between Patterson-UTI Energy, Inc. and Seth D. Wexler (filed November 2, 2009 as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2009 and incorporated herein by reference).*
10.28	Credit Agreement dated August 19, 2010, among Patterson-UTI Energy, Inc., as borrower, Wells Fargo Bank, N.A., as administrative agent, letter of credit issuer and lender and each of the other letter of credit issuer and lender parties thereto (filed August 19, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
10.29	Note Purchase Agreement dated October 5, 2010 by and among Patterson-UTI Energy, Inc. and the purchasers named therein (filed October 6, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
21.1	Subsidiaries of the Registrant.+
23.1	Consent of Independent Registered Public Accounting Firm.+
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.+
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.+
32.1	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.+
101	The following materials from Patterson-UTI Energy, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2011, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Income, (iii) the Consolidated Statements of Changes in Stockholders’ Equity, (iv) the Consolidated Statements of Cash Flows, and (v) Notes to Consolidated Financial Statements, tagged as blocks of text.+

* Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.

+ Filed herewith.

EX-10.17

Exhibit 10.17

EMPLOYMENT AGREEMENT

THIS EMPLOYMENT AGREEMENT (“Agreement”) is made by and between Patterson-UTI Drilling Company LLC, a Texas limited liability company (the “Company”) and James M. Holcomb (“Executive”).

WHEREAS, the Company currently employs Executive as Senior Vice President – Operations and wishes to recognize and reward Executive for his services; and

WHEREAS, in connection with the promotion of Executive to President of the Company, the Company and Executive have agreed to enter into an employment agreement on the terms and conditions, and for the consideration, hereinafter set forth.

NOW, THEREFORE, for and in consideration of the mutual promises, covenants and obligations contained herein, the Company and Executive agree as follows:

ARTICLE I

EMPLOYMENT AND DUTIES

1.1 Employment; Effective Date. The Company agrees to employ Executive, and Executive agrees to be employed by the Company, pursuant to the terms of this Agreement beginning as of January 1, 2012 (the “Effective Date”) and continuing for the period of time set forth in Article III of this Agreement, subject to the terms and conditions of this Agreement.

1.2 Positions and Office. From and after the Effective Date, Executive shall serve in the position of President of the Company or in such other position or positions as the parties mutually may agree, with a principal place of employment at the Company’s office in Houston, Texas.

1.3 Duties and Services. Executive agrees to serve in the positions referred to in Section 1.2 hereof and to perform diligently and to the best of Executive’s abilities the usual and customary duties and services appertaining to such positions, as well as such additional duties and services appropriate to such positions which the Company and Executive mutually may agree upon from time to time. Executive’s employment shall also be subject to the policies maintained and established by the Company that are of general applicability to the Company’s executives, as such policies may be amended from time to time. Executive agrees, during the period of Executive’s employment by the Company, to devote substantially all of Executive’s business time, energy and best efforts to the business and affairs of the Company and its affiliates.

1.4 Business Opportunities. Executive shall make full disclosure to the Company of all business opportunities pertaining to the Company’s business and shall not appropriate for Executive’s own benefit business opportunities concerning the subject matter of the fiduciary relationship.

ARTICLE II

COMPENSATION

2.1 Base Salary. During the Term, Executive shall receive an annualized base salary of $325,000 (the “Base Salary”), subject to any increases that may be granted in the future.

ARTICLE III

TERM AND TERMINATION OF EMPLOYMENT

3.1 Term. Subject to the remaining terms of this Article III, this Agreement shall be for an initial term that begins on the Effective Date and continues in effect through the third anniversary of the Effective Date (the “Initial Term”) and, unless terminated

sooner as herein provided, shall continue on a year to year basis after the third anniversary of the Effective Date (each a “Renewal Term” and together with the Initial Term, the “Term”). If the Company or Executive elects not to renew this Agreement for a Renewal Term, the Company or Executive must notify the other party at least 90 days before the expiration of the then-current Initial Term or Renewal Term, as applicable. In the event that one party provides the other with such a notice, no further automatic extensions will occur and this Agreement shall terminate at the end of the then-existing Initial Term or Renewal Term, as applicable.

3.2 Company’s Right to Terminate. Notwithstanding the provisions of Section 3.1, the Company may terminate Executive’s employment under this Agreement at any time for any of the following reasons:

(a) Executive’s death or “Disability” (as defined below); or

(b) for “Cause” (as defined below); or

(c) for any other reason whatsoever or for no reason at all, in the sole discretion of the Company.

For purpose of this Agreement, “Cause” shall mean (i) material breach by Executive of his obligations under this Agreement; (ii) conduct by Executive which is materially adverse to the interests of the Company or any affiliate; or (iii) dishonesty by Executive in his business dealings, or misappropriation of funds or property of the Company or any affiliate by Executive.

For purposes of this Agreement, “Disability” shall mean Executive being unable to perform Executive’s duties or fulfill Executive’s obligations under this Agreement by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than three months as determined by the Company and certified in writing by a competent medical physician jointly selected by Executive (or Executive’s legally authorized representative) and the CEO.

3.3 Executive’s Right to Terminate. Notwithstanding the provisions of Section 3.1, Executive shall have the right to terminate Executive’s employment under this Agreement for:

(a) “Good Reason” (as defined below); or

(b) for any other reason whatsoever or no reason at all, in the sole discretion of Executive.

For purposes of this Agreement, “Good Reason” shall mean the occurrence of any of the following events: (i) a material diminution in Executive’s Base Salary as of the Effective Date; (ii) a material diminution in Executive’s duties or responsibilities; (iii) the involuntary relocation of the geographic location of Executive’s principal place of employment by more than 75 miles from the location of Executive’s principal place of employment as of the Effective Date; or (iv) a material breach by the Company of a material provision of this Agreement.

Notwithstanding the foregoing any other provision in this Agreement to the contrary, any assertion by Executive of a termination of employment for “Good Reason” shall not be effective unless all of the following conditions are satisfied: (i) the condition described in this Section 3.3 giving rise to Executive’s termination of employment must have arisen without Executive’s consent; and (ii) (A) Executive must provide written notice to the Company of such condition within 45 days of the initial existence of the condition, (B) the condition specified in such notice must remain uncorrected for 30 days after receipt of such notice by the Company and (C) the date of Executive’s termination of employment must occur within 30 days after the expiration of the cure period set forth in (B) above. This definition of “Good Reason” shall be construed and administered in accordance with the requirements of Treasury Regulation Section 1.409A-1(n)(2).

ARTICLE IV

PROTECTION OF INFORMATION

4.1 Confidential Information. The Company shall disclose to Executive and Executive shall hold in a fiduciary capacity for the benefit of the Company secret or confidential information and knowledge or data relating to the Company or any of its affiliates, and their respective businesses, which shall have been obtained by Executive during Executive’s employment by the Company and which shall not be or become public knowledge (other than by acts by Executive or representatives of Executive in violation of this Agreement) (referred to herein as “Confidential Information”). After termination of Executive’s employment with the Company for any reason, Executive shall not, without the prior written consent of the Company or as may otherwise be required by law or legal process, communicate or divulge any such information, knowledge or data to anyone other than the Company and those designated by it. As soon as reasonably possible, but not later than two business days after Executive’s date of termination, Executive shall return to Company all documents and other tangible items of or containing Confidential Information which are in Executive’s possession, custody or control, or with respect to equipment that is not Company property that is in Executive’s possession, custody or control and which contains Confidential Information, Executive shall purge such Confidential Information from such equipment.

ARTICLE V

EFFECT OF TERMINATION OF EMPLOYMENT ON COMPENSATION

5.1 Effect of Termination of Employment on Compensation.

(a) Benefit Obligation and Accrued Obligation Defined. For purposes of this Agreement, payment of the “Benefit Obligation” shall mean payment by the Company to Executive (or his designated beneficiary or legal representative, as applicable), in accordance with the terms of the applicable plan document, of all vested benefits to which Executive is entitled under the terms of the employee benefit plans and compensation arrangements in which Executive is a participant as of Executive’s date of termination. “Accrued Obligation” means the sum of (i) Executive’s Base Salary through Executive’s date of termination, (ii) any accrued vacation pay earned by Executive, and (iii) any incurred but unreimbursed expenses for which Executive is entitled to reimbursement, in each case, to the extent not theretofore paid.

(b) By the Company for Cause; By Executive Without Good Reason. If during the Term Executive’s employment is terminated by the Company for Cause or by Executive for any reason other than Good Reason, the Company shall pay to Executive the Accrued Obligation within 30 days following the date of Executive’s date of termination or such earlier date as may be required by law. Following such payment, the Company shall have no further obligations to Executive other than as may be required by law or the terms of an employee benefit plan of the Company. The Company shall pay Executive the Benefit Obligation at the times specified in and in accordance with the terms of the applicable employee benefit plans and compensation arrangements.

(c) Death; Disability; By the Company Without Cause or by Executive for Good Reason. If during the Term (x) Executive’s employment is terminated due to death or Disability or by the Company without Cause or (y) Executive terminates his employment for Good Reason, then Executive (or his designated beneficiary or legal representative, if applicable) shall receive the following benefits and compensation from the Company:

(i) the Company shall pay Executive (or his designated beneficiary or legal representative, if applicable) the Accrued Obligation within 30 days following the date of Executive’s date of termination or such earlier date as may be required by law;

(ii) the Company shall continue to pay to Executive (or his designated beneficiary or legal representative, if applicable) his Base Salary as in effect on Executive’s date of termination in accordance with the Company’s usual and customary payroll procedures for a period of time equal to (x) in the event of termination of Executive’s employment due to death or Disability, twelve months following Executive’s date of termination or (y) in the event of termination of Executive’s employment by the Company without Cause or by Executive for Good Reason, the longer of (1) the remainder of the Term or (2) twelve months following Executive’s date of termination; provided, however, that the payments normally payable during the 60-day period following Executive’s date of termination shall be accrued and paid in a lump sum within five days following the end of such 60-day period;

(iii) the Company shall pay Executive (or his designated beneficiary or legal representative, if applicable) the Benefit Obligation at the times specified in and in accordance with the terms of the applicable employee benefit plans and compensation arrangements; and

(iv) during the twelve month period following Executive’s date of termination, Executive (if applicable) and his eligible dependents as of Executive’s date of termination shall continue to be covered by all medical, vision and dental benefit plans (but not including life or disability insurance) maintained by the Company under which Executive was covered immediately prior to his date of termination at the same active employee premium cost as a similarly situated active employee; provided, however, in any case the benefits provided by this paragraph shall cease if Executive becomes entitled to any group health benefits from a new employer.

(d) General Release of Claims. Payments to Executive under this Article V (other than Accrued Obligations and Benefit Obligations) are contingent upon Executive’s execution (or his estate, if applicable) of a release within 50 days of Executive’s date of termination in a form reasonably satisfactory to the Company that is not revoked by Executive (or his estate, if applicable) during any applicable revocation period provided in such release (which shall release and discharge the Company and its affiliates, and their officers, directors, managers, employees and agents from any and all claims or causes of action of any kind or character).

ARTICLE VI

RESTRICTIVE COVENANTS

6.1 Definitions. As used in this Article VI, the following terms shall have the following meanings:

(a) “Business” means the contract drilling business in which the Company, including its affiliates, is engaged in during the Prohibited Period.

(b) “Competing Business” means any business, individual, partnership, firm, corporation or other entity which wholly or in any significant part engages in any business competing with the Business in the Restricted Area. In no event will the Company or any of its affiliates be deemed a Competing Business.

(c) “Governmental Authority” means any governmental, quasi-governmental, state, county, city or other political subdivision of the United States or any other country, or any agency, court or instrumentality, foreign or domestic, or statutory or regulatory body thereof.

(d) “Legal Requirement” means any law, statute, code, ordinance, order, rule, regulation, judgment, decree, injunction, franchise, permit, certificate, license, authorization, or other directional requirement of any Governmental Authority.

(e) “Prohibited Period” means the period during which Executive is employed by the Company hereunder and a period of two years following Executive’s date of termination.

(f) “Restricted Area” means any country or subdivision thereof in which the Company or its affiliates currently engages in the Business and includes the parishes in Louisiana listed on Appendix A.

6.2 Non-Competition; Non-Solicitation. Executive and the Company agree to the non-competition and non-solicitation provisions of this Article VI; (i) in consideration for the Confidential Information provided by the Company to Executive pursuant to Article IV of this Agreement; (ii) as part of the consideration for the compensation and benefits to be paid to Executive hereunder; (iii) to protect the trade secrets and confidential information of the Company or its affiliates disclosed or entrusted to Executive by the Company or its affiliates or created or developed by Executive for the Company or its affiliates, the business goodwill of the Company or its affiliates developed through the efforts of Executive and/or the business opportunities disclosed or entrusted to Executive by the Company or its affiliates; and (iv) as an additional incentive for the Company to enter into this Agreement.

(a) Subject to the exceptions set forth in Section 6.2(b) below, Executive expressly covenants and agrees that during the Prohibited Period (i) Executive will refrain from carrying on or engaging in, directly or indirectly, any Competing Business in the Restricted Area and (ii) Executive will not, and Executive will cause Executive’s affiliates not to, directly or indirectly, own, manage, operate, join, become an employee, partner, owner or member of (or an independent contractor to), control or participate in or loan money to, sell or lease equipment to or sell or lease real property to any business, individual, partnership, firm, corporation or other entity which engages in a Competing Business in the Restricted Area.

(b) Notwithstanding the restrictions contained in Section 6.2(a), Executive or any of Executive’s affiliates may own an aggregate of not more than 1% of the outstanding stock of any class of any corporation engaged in a Competing Business, if such stock is listed on a national securities exchange or regularly traded in the over-the-counter market by a member of a national securities exchange, without violating the provisions of Section 6.2(a), provided that neither Executive nor any of Executive’s affiliates has the power, directly or indirectly, to control or direct the management or affairs of any such corporation and is not involved in the management of such corporation.

(c) Executive further expressly covenants and agrees that during the Prohibited Period, Executive will not, and Executive will cause Executive’s affiliates not to (i) engage or employ, or solicit or contact with a view to the engagement or employment of, any person who is an officer or employee of the Company or any of its affiliates or (ii) canvass, solicit, approach or entice away or cause to be canvassed, solicited, approached or enticed away from the Company or any of its affiliates any person who or which is a customer of any of such entities during the period during which Executive is employed by the Company.

(d) Executive expressly recognizes that Executive is a high-level, executive employee who will be provided with access to Confidential Information and trade secrets as part of Executive’s employment and that the restrictive covenants set forth in this Section 6.2 are reasonable and necessary in light of Executive’s executive position and access to the Company’s Confidential Information and trade secrets.

6.3 Non-Disparagement. Executive agrees that during the Term and thereafter, he shall refrain from making any statements (or authorizing any statements as being attributed to Executive) about the Company or its affiliates that are critical, derogatory or which may tend to injure the reputation or business of the Company or its affiliates. The foregoing notwithstanding, nothing shall prevent Executive from testifying in any legal proceeding pursuant to a subpoena or other legal process.

6.4 Relief. Executive and the Company agree and acknowledge that the limitations as to time, geographical area and scope of activity to be restrained as set forth in Section 6.2 hereof are reasonable and do not impose any greater restraint than is necessary to protect the legitimate business interests of the Company. Executive and the Company also acknowledge that money damages would not be sufficient remedy for any breach of Article IV or this Article VI by Executive, and the Company or its affiliates shall be entitled to enforce the provisions of Article IV or this Article VI by terminating payments then owing to Executive under this Agreement or otherwise and to specific performance and injunctive relief as remedies for such breach or any threatened breach. Such remedies shall not be deemed the exclusive remedies for a breach of Article IV or this Article VI but shall be in addition to all remedies available at law or in equity, including the recovery of damages from Executive and Executive’s agents. However, if it is determined that Executive has not committed a breach of Article IV or this Article VI, then the Company shall resume the payments and benefits due under this Agreement and pay to Executive all payments and benefits that had been suspended pending such determination.

6.5 Reasonableness; Enforcement. Executive acknowledges that the geographic scope and duration of the covenants contained in this Article VI are the result of arm’s-length bargaining and are fair and reasonable in light of (a) the nature and wide geographic scope of the operations of the Business, (b) Executive’s level of control over and contact with the Business in all jurisdictions in which it is conducted, (c) the fact that the Business is conducted throughout the Restricted Area and (d) the amount of compensation and Confidential Information that Executive is receiving in connection with the performance of Executive’s duties hereunder. It is the desire and intent of the parties that the provisions of this Article VI be enforced to the fullest extent permitted under applicable Legal Requirements, whether now or hereafter in effect and therefore, to the extent permitted by applicable Legal Requirements, Executive and the Company hereby waive any provision of applicable Legal Requirements that would render any provision of this Article VI invalid or unenforceable.

6.6 Reformation. The Company and Executive agree that the foregoing restrictions are reasonable under the circumstances and that any breach of the covenants contained in this Article VI would cause irreparable injury to the Company. Executive expressly represents that enforcement of the restrictive covenants set forth in this Article VI will not impose an undue hardship upon Executive or any person or entity affiliated with Executive. Executive understands that the foregoing restrictions may limit Executive’s ability to engage in certain businesses anywhere in the Restricted Area during the Prohibited Period, but acknowledges that Executive will receive sufficiently high remuneration and other benefits from the Company to justify such restriction. Further, Executive acknowledges that Executive’s skills are such that Executive can be gainfully employed in non-competitive employment, and that the restrictive covenants will not prevent Executive from earning a living. Nevertheless, if any of the aforesaid restrictions are found by a court of competent jurisdiction to be unreasonable, or overly broad as to geographic area or time, or otherwise unenforceable, the parties intend for the restrictions herein set forth to be modified by the court making such determination so as to be reasonable and enforceable and, as so modified, to be fully enforced.

ARTICLE VII

MISCELLANEOUS

7.1 Notices. For purposes of this Agreement, notices and all other communications provided for herein shall be in writing and shall be deemed to have been duly given (a) when received if delivered personally or by courier, (b) on the date receipt is

acknowledged if delivered by certified mail, postage prepaid, return receipt requested or (c) one day after transmission if sent by facsimile transmission with confirmation of transmission, as follows:

If to Executive, addressed to:	Mr. James M. Holcomb, at his last known residence address in the records of the Company
If to the Company, addressed to:	Patterson-UTI Drilling Company LLC 4510 Lamesa Highway Snyder, TX 79549 Attention: Chief Executive Officer

or to such other address as either party may furnish to the other in writing in accordance herewith, except that notices or changes of address shall be effective only upon receipt.

7.2 Applicable Law; Submission to Jurisdiction. This Agreement is entered into under, and shall be governed for all purposes by, the laws of the State of Texas, without regard to conflicts of laws principles thereof. With respect to any claim or dispute related to or arising under this Agreement, the parties hereto hereby consent to the exclusive jurisdiction, forum and venue of the state and federal courts located in Harris County, Texas.

7.3 Cooperation. Executive agrees to cooperate, in a reasonable and appropriate manner, with the Company and its attorneys, both during and after the termination of his employment, in connection with any litigation or other proceeding arising out of or relating to matters in which Executive was involved prior to the termination of his employment to the extent the Company pays all expenses Executive incurs in connection with such cooperation and to the extent such cooperation does not unduly interfere (as determined by Executive in good faith) with Executive’s personal or professional schedule.

7.4 No Waiver; Severability; Counterparts. No failure by either party hereto at any time to give notice of any breach by the other party of, or to require compliance with, any condition or provision of this Agreement shall be deemed a waiver of similar or dissimilar provisions or conditions at the same or at any prior or subsequent time. If a court of competent jurisdiction determines that any provision of this Agreement is invalid or unenforceable, then the invalidity or unenforceability of that provision shall not affect the validity or enforceability of any other provision of this Agreement, and all other provisions shall remain in full force and effect. This Agreement may be executed in one or more counterparts, each of which shall be deemed to be an original, but all of which together will constitute one and the same Agreement.

7.5 Withholding of Taxes and Other Employee Deductions. The Company may withhold from any benefits and payments made pursuant to this Agreement (whether actually or constructively made to Executive or treated as included in Executive’s income under Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”)) all federal, state, city and other applicable taxes and withholdings as may be required pursuant to any law or governmental regulation or ruling and all other customary deductions made with respect to the Company’s employees generally.

7.6 Headings. The Section headings have been inserted for purposes of convenience and shall not be used for interpretive purposes.

7.7 Affiliate. As used in this Agreement, the term “affiliate” as used with respect to a particular person or entity shall mean any other person or entity which owns or controls, is owned or controlled by, or is under common ownership or control with, such particular person or entity.

7.8 Successors. This Agreement shall be binding upon and inure to the benefit of the Company and any successor of the Company. Except as provided in the preceding sentence, this Agreement, and the rights and obligations of the parties hereunder, are

personal and neither this Agreement, nor any right, benefit or obligation of either party hereto, shall be subject to voluntary or involuntary assignment, alienation or transfer, whether by operation of law or otherwise, without the prior written consent of the other party. In addition, any payment owed to Executive hereunder after the date of Executive’s death shall be paid to Executive’s estate.

7.9 Term. Termination of this Agreement shall not affect any right or obligation of any party which is accrued or vested prior to such termination. Without limiting the scope of the preceding sentence, the provisions of Articles IV, V, VI and VII shall survive any termination of the employment relationship and/or of this Agreement.

7.10 Entire Agreement. Except as provided in any signed written agreement contemporaneously or hereafter executed by the Company and Executive, this Agreement constitutes the entire agreement of the parties with regard to the subject matter hereof, and contains all the covenants, promises, representations, warranties and agreements between the parties with respect to employment of Executive by the Company.

7.11 Modification; Waiver. Any modification to or waiver of this Agreement will be effective only if it is in writing and signed by the parties to this Agreement.

7.12 Compliance with Code Section 409A.

(a) It is intended that the payments and benefits provided under this Agreement shall be exempt from or comply with the application of the requirements of Code Section 409A. This Agreement shall be construed, administered and governed in a manner that affects such intent. Specifically, (i) each payment under this Agreement, including each payment in a series of installment payments, is deemed to be a separate installment payment and (ii) any taxable benefits or payments provided under this Agreement are deemed to be separate payments that qualify for the “short-term deferral” exclusion from Code Section 409A to the maximum extent possible. To the extent that this exclusion (or any other available exclusion) does not apply, then notwithstanding anything contained herein to the contrary, and to the extent required to comply with Code Section 409A, if Executive is a “specified employee,” as determined by the Company, as of his date of termination, then all amounts due under this Agreement that constitute a “deferral of compensation” within the meaning of Code Section 409A, that are provided as a result of a “separation from service” within the meaning of Code Section 409A, and that would otherwise be paid or provided during the first six months following Executive’s date of termination, shall be accumulated through and paid or provided on the first business day that is more than six months after the date of Executive’s date of termination (or, if Executive dies during such six-month period, within 90 days after Executive’s death). For all purposes of this Agreement, Executive shall be considered to have terminated employment with the Company when Executive incurs a “separation from service” with the Company within the meaning of Code
Section 409A(a)(2)(A)(i).

(b) With regard to any provision herein that provides for reimbursement of costs and expenses or in-kind benefits, except as permitted by Code Section 409A: (i) the right to reimbursement or in-kind benefits shall not be subject to liquidation or exchange for another benefit; (ii) the amount of expenses eligible for reimbursement, or in-kind benefits, provided during any calendar year shall not affect the expenses eligible for reimbursement, or in-kind benefits to be provided, in any other calendar year; and (iii) such payments shall be made on or before the last day of Executive’s calendar year following the calendar year in which the expense occurred, or such earlier date as required hereunder.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement on this 30^th day of December, 2011.

PATTERSON-UTI DRILLING COMPANY LLC
By:	/s/ Douglas J. Wall
Name: Title:	Douglas J. Wall Chief Executive Officer

EXECUTIVE

/s/ James M. Holcomb

James M. Holcomb

Appendix A

Allen

Beauregard

Bienville

Bossier

Caddo

Calcasieu

Cameron

DeSoto

Jackson

Jefferson Davis

Lafayette

Lincoln

Natchitoches

Rapides

Red River

Sabine

St. Landry

St. Mary

Vermilion

Webster

EX-21.1

Exhibit 21.1

Subsidiaries of the Registrant

Name	State of Incorporation or organization
Ambar Lone Star Fluid Services LLC	Texas
Patterson Petroleum LLC	Texas
Patterson-UTI Drilling Canada Limited	Nova Scotia
Patterson-UTI Drilling Company LLC	Texas
Patterson-UTI Drilling International, Inc.	Delaware
Patterson-UTI Management Services, LLC	Delaware
Universal Pressure Pumping, Inc.	Delaware
Universal Well Services, Inc.	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-166434, 333-67810, 333-60470, 333-126016, 333-108311 and 333-152705) of Patterson-UTI Energy, Inc. of our report dated February 10, 2012 relating to the consolidated financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 10, 2012

EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, Douglas J. Wall, certify that:

1. I have reviewed this annual report on Form 10-K of Patterson-UTI Energy, 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(s) 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; and

(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(s) 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 the 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.

/s/ Douglas J. Wall

Douglas J. Wall

President and Chief Executive Officer

Date: February 10, 2012

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, John E. Vollmer III, certify that:

1. I have reviewed this annual report on Form 10-K of Patterson-UTI Energy, 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(s) 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; and

(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(s) 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 the 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.

/s/ John E. Vollmer III

John E. Vollmer III

Senior Vice President — Corporate Development,

Chief Financial Officer and Treasurer

Date: February 10, 2012

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

NOT FILED PURSUANT TO THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report of Patterson-UTI Energy, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Douglas J. Wall, Chief Executive Officer, and John E. Vollmer III, Chief Financial Officer, of the Company, each certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

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

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission upon request. The foregoing is being furnished solely pursuant to said Section 906 and Rule 13a-14(b) promulgated under the Securities Exchange Act of 1934, as amended, and is not being filed as part of the Report or as a separate disclosure document.

/s/ Douglas J. Wall

Douglas J. Wall

Chief Executive Officer

February 10, 2012

/s/ John E. Vollmer III

John E. Vollmer III

Chief Financial Officer

February 10, 2012

XML

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Components of Income Tax Provision

Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2011, 2010 and 2009 are as follows (in thousands):

	2011			2010			2009
Federal income tax expense (benefit):
Current	$	16,336		$	(77,310	)	$	(117,493	)
Deferred		146,842			145,198			103,574
		163,178			67,888			(13,919	)
State income tax expense (benefit):
Current		6,056			19			(1,883	)
Deferred		13,196			3,246			(1,875	)
		19,252			3,265			(3,758	)
Foreign income tax expense (benefit):
Current		6,579			2,657			338
Deferred		(1,071	)		(954	)		(256	)
		5,508			1,703			82
Total income tax expense (benefit):
Current		28,971			(74,634	)		(119,038	)
Deferred		158,967			147,490			101,443
Total income tax expense (benefit)	$	187,938		$	72,856		$	(17,595	)

Difference Between Statutory Federal Income Tax Rate And Effective Income Tax Rate

The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2011, 2010 and 2009 is summarized as follows:

	2011			2010			2009
Statutory tax rate		35.0	%		35.0	%		35.0	%
State income taxes		2.5			1.1			4.7
Permanent differences		(0.1	)		2.3			(5.7	)
Other, net		(0.6	)		(0.2	)		0.1
Effective tax rate		36.8	%		38.2	%		34.1	%

Tax effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):

	December 31, 2011			Net Change			December 31, 2010			Net Change			December 31, 2009			Net Change			December 31, 2008
Deferred tax assets:
Current:
Net operating loss carryforwards	$	114,576		$	114,576		$	—		$	—		$	—		$	—		$	—
Workers’ compensation allowance		24,004			714			23,290			(1,334	)		24,624			(1,360	)		25,984
Other		18,800			146			18,654			(962	)		19,616			(2,735	)		22,351
		157,380			115,436			41,944			(2,296	)		44,240			(4,095	)		48,335
Non-current:
Net operating loss carryforwards		18,434			11,969			6,465			1,593			4,872			4,872			—
Expense associated with employee stock options		12,728			1,476			11,252			2,123			9,129			2,500			6,629
Federal benefit of foreign deferred tax liabilities		—			—			—			(9,160	)		9,160			(256	)		9,416
Federal benefit of state deferred tax liabilities		20,260			7,105			13,155			3,383			9,772			2,702			7,070
Other		10,670			(5,361	)		16,031			6,546			9,485			4,120			5,365
		62,092			15,189			46,903			4,485			42,418			13,938			28,480
Total deferred tax assets		219,472			130,625			88,847			2,189			86,658			9,843			76,815
Deferred tax liabilities:
Current:
Other		(14,655	)		474			(15,129	)		(3,766	)		(11,363	)		1,044			(12,407	)
Non-current:
Property and equipment basis difference		(835,823	)		(289,168	)		(546,655	)		(133,542	)		(413,113	)		(110,786	)		(302,327	)
Other		(12,901	)		(1,231	)		(11,670	)		(709	)		(10,961	)		(7,091	)		(3,870	)
		(848,724	)		(290,399	)		(558,325	)		(134,251	)		(424,074	)		(117,877	)		(306,197	)
Total deferred tax liabilities		(863,379	)		(289,925	)		(573,454	)		(138,017	)		(435,437	)		(116,833	)		(318,604	)
Net deferred tax liability	$	(643,907	)	$	(159,300	)	$	(484,607	)	$	(135,828	)	$	(348,779	)	$	(106,990	)	$	(241,789	)

XML

Summary of Depreciation, Depletion, Amortization and Impairment Expense Related to Property and Equipment and Intangible Assets (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant, and Equipment Disclosure [Line Items]
Depreciation and impairment expense	$ 419,200,000	$ 322,300,000	$ 280,600,000
Amortization expense	4,100,000	1,000,000
Depletion expense	14,000,000	10,200,000	9,200,000
Total	$ 437,279,000	$ 333,493,000	$ 289,847,000

XML

Summary of Operating Results from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues from discontinued operations	$ 1,104	$ 9,449	$ 79,786
Loss from discontinued operations before income taxes	(576)	(1,499)	(6,538)
Income tax benefit	209	543	2,208
Loss from discontinued operations	(367)	(956)	(4,330)
Drilling and completion fluids revenues
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues from discontinued operations		3,737	79,786
Electric wireline revenues
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues from discontinued operations	$ 1,104	$ 5,712

XML

Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011
Shares
Outstanding at beginning of year	7,710,102
Granted	419,500
Exercised	(1,048,307)
Cancelled
Expired
Outstanding at end of year	7,081,295
Exercisable at end of year	6,077,635
Weighted Average Exercise Price
Outstanding at beginning of year	$ 19.58
Granted	$ 30.28
Exercised	$ 16.04
Cancelled
Expired
Outstanding at end of year	$ 20.73
Exercisable at end of year	$ 20.69

XML

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011 Rigs	Dec. 31, 2010 Rigs	Dec. 31, 2009 Rigs
Property, Plant, and Equipment Disclosure [Line Items]
Impairment charges related to oil and natural gas properties	$ 3,000,000	$ 792,000	$ 3,700,000
Number of drilling rigs that would no longer be marketed as rigs	53	4	23
Impairment charges on drilling rigs	15,700,000	4,200,000	10,500,000
Proceeds from sale of certain rights		22,300,000
Gain on sale of certain rights		$ 20,100,000

XML

Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory tax rate	35.00%	35.00%	35.00%
State income taxes	2.50%	1.10%	4.70%
Permanent differences	(0.10%)	2.30%	(5.70%)
Other, net	(0.60%)	(0.20%)	0.10%
Effective tax rate	36.80%	38.20%	34.10%

XML

Calculation of Income (Loss) Per Share From Continuing and Discontinued Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
BASIC EPS:
Income (loss) from continuing operations	$ 322,780	$ 117,898	$ (33,960)
Adjust for (income) loss attributed to holders of non-vested restricted stock	(2,545)	(884)	313
Income (loss) from continuing operations attributed to common stockholders	320,235	117,014	(33,647)
Loss from discontinued operations, net	(367)	(956)	(4,330)
Adjust for loss attributed to holders of non-vested restricted stock	3	7	38
Loss from discontinued operations attributed to common stockholders	(364)	(949)	(4,292)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	153,871	152,772	152,069
Basic income (loss) from continuing operations per common share	$ 2.08	$ 0.77	$ (0.22)
Basic loss from discontinued operations per common share	$ 0.00	$ (0.01)	$ (0.03)
Basic net income (loss) per common share	$ 2.08	$ 0.76	$ (0.25)
DILUTED EPS:
Income (loss) from continuing operations attributed to common stockholders	320,235	117,014	(33,647)
Add incremental earnings related to potential common shares
Adjusted income (loss) from continuing operations attributed to common stockholders	$ 320,235	$ 117,014	$ (33,647)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	153,871	152,772	152,069
Add dilutive effect of potential common shares	1,433	504
Weighted average number of diluted common shares outstanding	155,304	153,276	152,069
Diluted income (loss) from continuing operations per common share	$ 2.06	$ 0.76	$ (0.22)
Diluted loss from discontinued operations per common share	$ 0.00	$ (0.01)	$ (0.03)
Diluted net income (loss) per common share	$ 2.06	$ 0.76	$ (0.25)
Potentially dilutive securities excluded as anti-dilutive	1,641	4,164	8,090

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Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill by Operating Segment

Goodwill — Goodwill by operating segment as of December 31, 2011 and 2010 and changes for the years then ended are as follows (in thousands):

	Contract Drilling		Pressure Pumping		Total
Balance December 31, 2009	$	86,234	$	—	$	86,234
Acquisition		—		67,575		67,575
Balance December 31, 2010		86,234		67,575		153,809
Changes to goodwill		—		—		—
Balance December 31, 2011	$	86,234	$	67,575	$	153,809

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2011 and 2010 (in thousands):

	2011							2010
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Non-compete agreement	$	1,400	$	(583	)	$	817	$	1,400	$	(116	)	$	1,284
Customer relationships		25,500		(4,553	)		20,947		25,500		(910	)		24,590
Total intangible assets	$	26,900	$	(5,136	)	$	21,764	$	26,900	$	(1,026	)	$	25,874

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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended												12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2011 Prior fiscal year	Dec. 31, 2011 Expiring in 2014	Dec. 31, 2011 Expiring in 2015	Dec. 31, 2011 Expire in 2016	Dec. 31, 2011 Expire in 2018	Dec. 31, 2011 Expire in 2028	Dec. 31, 2011 Expiring in 2029	Dec. 31, 2011 Expiring in 2030	Dec. 31, 2011 Expire in 2031	Dec. 31, 2011 U.S.	Dec. 31, 2011 U.S. Minimum	Dec. 31, 2011 U.S. Maximum	Dec. 31, 2011 Canada	Dec. 31, 2011 Canada Minimum	Dec. 31, 2011 Canada Maximum
Income Taxes [Line Items]
Domestic Production Activities Deduction	9.00%	6.00%
Other deferred tax assets			$ 29,500,000
Operating losses carried forward			118,000,000
Deferred tax liabilities that have not been provided on such unremitted foreign earnings for United States Federal or state income taxes			25,200,000
Federal net operating losses			327,000,000
Operating losses carried back to prior years			136,000,000	11,100,000
Net operating losses carried forward					9,600,000	12,900,000	8,200,000	2,400,000	15,300,000	59,800,000	35,700,000	426,000,000
Unrecognized tax benefits			0
Tax periods open for examination													Tax years ended December 31, 2008 through December 31, 2010			Tax years ended December 31, 2007 through December 31, 2010
Tax period open for examination														2008	2010		2007	2010
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States	$ (5,100,000)

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Restricted Stock Activity (Detail) (Restricted Stock Awards, USD $)	12 Months Ended
	Dec. 31, 2011
Restricted Stock Awards
Shares
Outstanding at beginning of period	1,114,051
Granted	782,300
Vested	(599,394)
Forfeited	(83,158)
Outstanding at end of period	1,213,799
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	$ 16.05
Granted	$ 30.46
Vested	$ 17.60
Forfeited	$ 22.58
Outstanding at end of period	$ 24.13

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Concentrations of Credit Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Concentration Risk [Line Items]
Provision for bad debts	$ 0	$ (2,000)	$ 3,810

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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2010	Dec. 31, 2011 Year	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Line Items]
Accumulated impairment losses		$ 0	$ 0
Amortization expense		4,100,000	1,000,000
Non-compete agreement
Goodwill and Intangible Assets Disclosure [Line Items]
Contract term	3 years
Amortization period (in years)		3
Amortization expense		467,000	116,000
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization period (in years)		7
Amortization expense		3,600,000	910,000
Pressure Pumping
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill expected to be deductible for tax purposes			$ 53,200,000

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Leases - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases Disclosure [Line Items]
Rent expense	$ 35.0	$ 18.1	$ 11.9

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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 437,279	$ 333,493	$ 289,847
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	344,312	280,458	248,424
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	73,279	40,724	27,589
Operating Segments | Oil and Natural Gas
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	16,962	10,950	12,927
Corporate and other
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 2,726	$ 1,361	$ 907

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Employee Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefits Disclosure [Line Items]
Cash contributions to 401(K) plan	$ 4.6	$ 3.1	$ 2.8

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Business Segments - Capital Expenditures (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,011,578	$ 738,090	$ 452,646
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	784,686	655,550	395,376
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	198,061	51,064	43,144
Operating Segments | Oil and Natural Gas
Segment Reporting Information [Line Items]
Capital expenditures	22,884	23,067	7,341
Corporate and other
Segment Reporting Information [Line Items]
Capital expenditures	$ 5,947	$ 8,409	$ 6,785

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Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Federal income tax expense (benefit):
Current	$ 16,336	$ (77,310)	$ (117,493)
Deferred	146,842	145,198	103,574
Federal Income Tax Expense (Benefit), Continuing Operations, Total	163,178	67,888	(13,919)
State income tax expense (benefit):
Current	6,056	19	(1,883)
Deferred	13,196	3,246	(1,875)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	19,252	3,265	(3,758)
Foreign income tax expense (benefit):
Current	6,579	2,657	338
Deferred	(1,071)	(954)	(256)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	5,508	1,703	82
Total income tax expense (benefit):
Current	28,971	(74,634)	(119,038)
Deferred	158,967	147,490	101,443
Total income tax expense (benefit)	$ 187,938	$ 72,856	$ (17,595)

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Additional information with Respect to Options granted, Vested and Exercised (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of stock options granted (per share)	$ 12.24	$ 5.69	$ 4.71
Grant date fair value of stock options vested during the year	$ 5,639	$ 5,553	$ 6,973
Aggregate intrinsic value of stock options exercised	$ 12,663	$ 523	$ 510

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Fair Values of Financial Instruments

12 Months Ended

Dec. 31, 2011

Fair Values of Financial Instruments

17. Fair Values of Financial Instruments

The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items.

The estimated fair value of the Company’s outstanding debt balances (including current portion) as of December 31, 2011 and 2010 is set forth below (in thousands):

	December 31, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Borrowings under Credit Agreement:
Revolving credit facility	$	110,000	$	110,000	$	—	$	—
Term loan facility		92,500		92,500		98,750		98,750
Senior Notes		300,000		315,942		300,000		289,625
Total debt	$	502,500	$	518,442	$	398,750	$	388,375

The carrying value of the balance outstanding under the term loan facility and revolving credit facility approximates fair value as both facilities have a floating interest rate that adjusts at each quarterly interest payment date. The fair value of the 4.97% Series A Senior Notes at December 31, 2011 and 2010 is based on discounted cash flows associated with the Senior Notes using current market rates of interest at those respective dates. These fair value estimates are based on observable market inputs and are considered level 2 fair value estimates in the fair value hierarchy of fair value accounting.

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Acquisitions - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2010 Entity	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Business Acquisition [Line Items]
Business acquisition date	2010-10-01
Subsidiaries completed acquisition of certain assets	2
Total purchase price	$ 241,308,000
Acquisition-related expenses			2,485,000
Revenue from acquired business		2,565,943,000	1,462,931,000	781,946,000
Operating income (loss) from acquired business		525,601,000	200,925,000	(48,214,000)
Non-compete agreement
Business Acquisition [Line Items]
Amortization period (in years)		3
Key Electric Wireline Services, LLC
Business Acquisition [Line Items]
Revenue from acquired business			5,700,000
Operating income (loss) from acquired business			(1,500,000)
Impairment of the assets to be disposed			2,200,000
Key Energy Pressure Pumping Services, LLC
Business Acquisition [Line Items]
Revenue from acquired business			84,700,000
Operating income (loss) from acquired business			$ 22,800,000

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Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Estimated Fair Value of Outstanding Debt Balances

The estimated fair value of the Company’s outstanding debt balances (including current portion) as of December 31, 2011 and 2010 is set forth below (in thousands):

	December 31, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Borrowings under Credit Agreement:
Revolving credit facility	$	110,000	$	110,000	$	—	$	—
Term loan facility		92,500		92,500		98,750		98,750
Senior Notes		300,000		315,942		300,000		289,625
Total debt	$	502,500	$	518,442	$	398,750	$	388,375

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Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs), USD $)	12 Months Ended
	Dec. 31, 2011
Restricted Stock Units (RSUs)
Shares
Outstanding at beginning of period	17,834
Granted	10,000
Vested	(10,333)
Forfeited
Outstanding at end of period	17,501
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	$ 19.73
Granted	$ 30.63
Vested	$ 23.94
Forfeited
Outstanding at end of period	$ 23.47

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Stockholder' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Cash Dividends

The Company paid cash dividends during the years ended December 31, 2009, 2010 and 2011 as follows:

	Per Share		Total
			(in thousands)
2009:
Paid on March 31, 2009	$	0.05	$	7,655
Paid on June 30, 2009		0.05		7,675
Paid on September 30, 2009		0.05		7,675
Paid on December 30, 2009		0.05		7,676
Total cash dividends	$	0.20	$	30,681
2010:
Paid on March 30, 2010	$	0.05	$	7,677
Paid on June 30, 2010		0.05		7,706
Paid on September 30, 2010		0.05		7,704
Paid on December 30, 2010		0.05		7,709
Total cash dividends	$	0.20	$	30,796
2011:
Paid on March 30, 2011	$	0.05	$	7,708
Paid on June 30, 2011		0.05		7,772
Paid on September 30, 2011		0.05		7,777
Paid on December 30, 2011		0.05		7,788
Total cash dividends	$	0.20	$	31,045

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Business Acquisition Pro-forma Unaudited Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition, Pro Forma Information [Line Items]
Revenue	$ 1,660,635	$ 905,168
Income (loss) from continuing operations	127,257	(46,807)
Net income (loss)	$ 126,301	$ (51,137)
Basic income (loss) from continuing operations per common share	$ 0.83	$ (0.33)
Basic net income (loss) per common share	$ 0.83	$ (0.36)
Diluted income (loss) from continuing operations per common share	$ 0.82	$ (0.33)
Diluted net income (loss) per common share	$ 0.82	$ (0.36)

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Stock-based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total number of shares authorized for grant before amendment		10,250,000
Total number of shares authorized for grant after amendment		15,250,000
Options outstanding, aggregate intrinsic value	$ 17,900,000
Options outstanding, weighted-average remaining contractual term	5.3
Options exercisable, aggregate intrinsic value	14,600,000
Options exercisable, weighted-average remaining contractual term	4.8
Outstanding non-vested options	1,003,660
Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Outstanding non-vested restricted stock	1,100,000
Performance Unit Awards 2009
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	The performance period for the 2009 Performance Units is the period from April 1, 2009 through March 31, 2012, but can extend through March 31, 2014 in certain circumstances.
Award description	Generally, the recipients will receive a base payment if the Company's total shareholder return is positive and, when compared to the peer group, is at or above the 25th percentile but less than the 50th percentile, two times the base if at or above the 50th percentile but less than the 75th percentile, and four times the base if at the 75th percentile or higher.
Base payment	1,700,000
Pro-rated obligation	3,600,000
Compensation expense	1,300,000	1,500,000	859,000.0
Performance Unit Awards 2009 | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2012
Performance Unit Awards 2009 | Maximum | Certain Circumstances
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2014
Performance Unit Awards 2009 | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	April 1, 2009
Performance Unit Awards 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	The performance period for the 2010 Performance Units is the period from April 1, 2010 through March 31, 2013, but can extend through March 31, 2015 in certain circumstances.
Award description	Generally, the recipients will receive a base number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 25th percentile, two times the base if at the 50th percentile, and four times the base if at the 75th percentile or higher. The grant of shares when achievement is between the 25th and 75th percentile will be determined on a pro-rata basis.
Compensation expense	1,000,000	779,000
Base number of shares	89,375
Grant date fair value	3,100,000
Performance Unit Awards 2010 | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2013
Performance Unit Awards 2010 | Maximum | Certain Circumstances
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2015
Performance Unit Awards 2010 | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	April 1, 2010
Performance Unit Awards 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	The performance period for the 2011 Performance Units is the period from April 1, 2011 through March 31, 2014, but can extend through March 31, 2016 in certain circumstances.
Award description	Generally, the recipients will receive a base number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 25th percentile, two times the base if at the 50th percentile, and four times the base if at the 75th percentile or higher. The grant of shares when achievement is between the 25th and 75th percentile will be determined on a pro-rata basis.
Compensation expense	1,400,000
Base number of shares	72,188
Grant date fair value	$ 5,600,000
Performance Unit Awards 2011 | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2014
Performance Unit Awards 2011 | Maximum | Certain Circumstances
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	March 31, 2016
Performance Unit Awards 2011 | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	April 1, 2011
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total number of shares authorized for grant after amendment	15,250,000
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Non Employee Director
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	1 year
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Employees
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	3 years
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Option term	10 years
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	4 years
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Employee Stock Option | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	5 years
Option term	10 years
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Employee Stock Option | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	3 years
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan ("2001 Plan") | Employee Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Awards vesting period	5 years
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan ("2001 Plan") | Employee Stock Option | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Option term	10 years

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Changes to the Company's Asset Retirement Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Balance at beginning of year	$ 3,063	$ 2,955
Liabilities incurred	361	335
Liabilities settled	(110)	(339)
Accretion expense	143	112
Revision in estimated costs of plugging oil and natural gas wells	(2)
Asset retirement obligation at end of year	$ 3,455	$ 3,063

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Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jan. 20, 2010 Ambar Lone Star Fluid Services LLC	Jan. 27, 2011 Universal Wireline, Inc.	Dec. 31, 2010 Universal Wireline, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by investing activities of discontinued operations	$ 25,500,000	$ 42,638,000	$ (54,000)	$ 42,638,000	$ 25,500,000
Impairment of the assets to be disposed						$ 2,200,000

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Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Description of Business and Summary of Significant Accounting Policies

1. Description of Business and Summary of Significant Accounting Policies

A description of the business and basis of presentation follows:

Description of business — Patterson-UTI Energy, Inc., through its wholly-owned subsidiaries (collectively referred to herein as “Patterson-UTI” or the “Company”), provides onshore contract drilling services to major and independent oil and natural gas operators primarily in Texas, New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, Pennsylvania, West Virginia, Ohio and western Canada. The Company provides pressure pumping services to oil and natural gas operators primarily in Texas and the Appalachian Basin. The Company also invests, on a non-operating working interest basis, in oil and natural gas properties.

Basis of presentation — The consolidated financial statements include the accounts of Patterson-UTI and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Except for wholly-owned subsidiaries, the Company has no controlling financial interests in any other entity which would require consolidation.

The U.S. dollar is the functional currency for all of the Company’s operations except for its Canadian operations, which use the Canadian dollar as its functional currency. The effects of exchange rate changes are reflected in accumulated other comprehensive income, which is a separate component of stockholders’ equity.

A summary of the significant accounting policies follows:

Management estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.

Revenue recognition — Revenues from daywork drilling and pressure pumping activities are recognized as services are performed. The Company follows the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and the risks therein, the Company follows the completed-contract method of accounting for such arrangements. Under this method, revenues and expenses related to a well-in-progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed total revenues. The Company recognizes as revenue reimbursements received from third parties for out-of-pocket expenses and accounts for those out-of-pocket expenses as direct costs. Except for two wells drilled under footage contacts in 2009, all of the wells the Company drilled in 2011, 2010 and 2009 were drilled under daywork contracts.

Accounts receivable — Trade accounts receivable are recorded at the invoiced amount. The allowance for doubtful accounts represents the Company’s estimate of the amount of probable credit losses existing in the Company’s accounts receivable. The Company reviews the adequacy of its allowance for doubtful accounts at least quarterly. Significant individual accounts receivable balances and balances which have been outstanding greater than 90 days are reviewed individually for collectability. Account balances, when determined to be uncollectable, are charged against the allowance.

Inventories — Inventories consist primarily of sand and chemical products to be used in conjunction with the Company’s pressure pumping activities. The inventories are stated at the lower of cost or market, determined by the first-in, first-out method.

Property and equipment — Property and equipment is carried at cost less accumulated depreciation. Depreciation is provided on the straight-line method over the estimated useful lives. The method of depreciation does not change whenever equipment becomes idle. The estimated useful lives, in years, are shown below:

	Useful Lives
Drilling rigs and other equipment		1.5-15
Buildings		15-20
Other		3-12

Long-lived assets, including property and equipment, are evaluated for impairment when certain triggering events or changes in circumstances indicate that the carrying values may not be recoverable over their estimated remaining useful life.

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. Costs of exploratory wells are initially capitalized to wells-in-progress until the outcome of the drilling is known. The Company reviews wells-in-progress quarterly to determine whether sufficient progress is being made in assessing the reserves and economic viability of the respective projects. If no progress has been made in assessing the reserves and economic viability of a project after one year following the completion of drilling, the Company considers the well costs to be impaired and recognizes the costs as expense. Geological and geophysical costs, including seismic costs, and costs to carry and retain undeveloped properties are charged to expense when incurred. The capitalized costs of both developmental and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves for each respective field.

The Company reviews its proved oil and natural gas properties for impairment whenever a triggering event occurs, such as downward revisions in reserve estimates or decreases in expected future oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are prepared based on management’s expectation of future pricing over the lives of the respective fields. These cash flow estimates are reviewed by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between net book value and discounted cash flow. The discounted cash flow estimates used in measuring impairment are based on management’s expectations of future commodity prices over the life of the respective field. The Company reviews unproved oil and natural gas properties quarterly to assess potential impairment. The Company’s impairment assessment is made on a lease-by-lease basis and considers factors such as management’s intent to drill, lease terms and abandonment of an area. If an unproved property is determined to be impaired, the related property costs are expensed.

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. The Company assesses impairment of its goodwill at least annually as of December 31, or on an interim basis if events or circumstances indicate that the fair value of goodwill may have decreased below its carrying value.

Maintenance and repairs — Maintenance and repairs are charged to expense when incurred. Renewals and betterments which extend the life or improve existing property and equipment are capitalized.

Disposals — Upon disposition of property and equipment, the cost and related accumulated depreciation are removed and any resulting gain or loss is reflected in the consolidated statement of operations.

Net income (loss) per common share — The Company provides a dual presentation of its net income (loss) per common share in its consolidated statements of operations: Basic net income (loss) per common share (“Basic EPS”) and diluted net income (loss) per common share (“Diluted EPS”).

Basic EPS excludes dilution and is computed by first allocating earnings between common stockholders and holders of non-vested shares of restricted stock. Basic EPS is then determined by dividing the earnings attributable to common stockholders by the weighted average number of common shares outstanding during the period, excluding non-vested shares of restricted stock.

Diluted EPS is based on the weighted average number of common shares outstanding plus the dilutive effect of potential common shares, including stock options, non-vested shares of restricted stock and restricted stock units. The dilutive effect of stock options and restricted stock units is determined using the treasury stock method. The dilutive effect of non-vested shares of restricted stock is based on the more dilutive of the treasury stock method or the two-class method, assuming a reallocation of undistributed earnings to common stockholders after considering the dilutive effect of potential common shares other than non-vested shares of restricted stock.

The following table presents information necessary to calculate income (loss) from continuing operations per share, loss from discontinued operations per share and net income (loss) per share for the years ended December 31, 2011, 2010 and 2009, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):

	2011			2010			2009
BASIC EPS:
Income (loss) from continuing operations	$	322,780		$	117,898		$	(33,960	)
Adjust for (income) loss attributed to holders of non-vested restricted stock		(2,545	)		(884	)		313
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Loss from discontinued operations, net	$	(367	)	$	(956	)	$	(4,330	)
Adjust for loss attributed to holders of non-vested restricted stock		3			7			38
Loss from discontinued operations attributed to common stockholders	$	(364	)	$	(949	)	$	(4,292	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Basic income (loss) from continuing operations per common share	$	2.08		$	0.77		$	(0.22	)
Basic loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Basic net income (loss) per common share	$	2.08		$	0.76		$	(0.25	)
DILUTED EPS:
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Add incremental earnings related to potential common shares		—			—			—
Adjusted income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Add dilutive effect of potential common shares		1,433			504			—
Weighted average number of diluted common shares outstanding		155,304			153,276			152,069
Diluted income (loss) from continuing operations per common share	$	2.06		$	0.76		$	(0.22	)
Diluted loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Diluted net income (loss) per common share	$	2.06		$	0.76		$	(0.25	)
Potentially dilutive securities excluded as anti-dilutive		1,641			4,164			8,090

Income taxes — The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for operating loss and tax credit carryforwards and 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 enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the enactment date. If applicable, a valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized. The Company’s policy is to account for interest and penalties with respect to income taxes as operating expenses.

Stock-based compensation — The Company recognizes the cost of share-based payments under the fair-value-based method. Under this method, compensation cost related to share-based payments is measured based on the estimated fair value of the awards at the date of grant, net of estimated forfeitures. This expense is recognized over the expected life of the awards (See Note 11).

Statement of cash flows — For purposes of reporting cash flows, cash and cash equivalents include cash on deposit and money market funds.

Recently Issued Accounting Standards — In September 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update that simplifies how entities test goodwill for impairment. This update permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. Previous guidance required an entity to test goodwill for impairment, on at least an annual basis, by comparing the fair value of a reporting unit with its carrying amount. If the fair value of a reporting unit is less than its carrying amount, then the second step of the test must be performed to measure the amount of the impairment loss, if any. Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. This update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted if an entity’s financial statements for the most recent annual or interim period have not yet been issued. The Company has elected to early adopt this accounting standard update as of December 31, 2011 as discussed further in Note 5.

In June 2011, the FASB issued an accounting standard update that requires that all non-owner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present total net income and its components followed consecutively by a second statement that should present total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. Historically, these components of other comprehensive income and total comprehensive income have been presented in the statement of changes in stockholders’ equity by many companies, including the Company. This requirement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will result in the addition of a new consolidated statement of comprehensive income to the Company’s consolidated financial statements beginning with the quarter ending March 31, 2012.

In May 2011, the FASB issued an accounting standard update to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with United States GAAP and International Financial Reporting Standards. The amendments in this update do not require additional fair value measurements, but provide additional guidance as to measuring fair value as well as certain additional disclosure requirements. The requirements in this update are effective during interim and annual periods beginning after December 15, 2011 and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will not have a material impact on the Company’s disclosures included in its consolidated financial statements.

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Long Term Debt - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended					1 Months Ended		12 Months Ended		1 Months Ended								1 Months Ended					1 Months Ended		1 Months Ended								1 Months Ended
	Oct. 05, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2009 2009 Credit Facility	Mar. 31, 2009 2009 Credit Facility	Jul. 02, 2010 364-Day Credit Agreement	Aug. 19, 2010 2010 Credit Agreement LegalMatter	Dec. 31, 2011 2010 Credit Agreement	Dec. 31, 2010 2010 Credit Agreement	Aug. 19, 2010 2010 Credit Agreement Minimum Point	Aug. 19, 2010 2010 Credit Agreement Maximum	Dec. 31, 2011 2010 Credit Agreement LIBOR	Aug. 19, 2010 2010 Credit Agreement LIBOR Minimum	Aug. 19, 2010 2010 Credit Agreement LIBOR Maximum	Dec. 31, 2011 2010 Credit Agreement Base Rate	Aug. 19, 2010 2010 Credit Agreement Base Rate Minimum	Aug. 19, 2010 2010 Credit Agreement Base Rate Maximum	Aug. 19, 2010 2010 Credit Agreement Revolving Credit Facility	Dec. 31, 2011 2010 Credit Agreement Revolving Credit Facility	Dec. 31, 2011 2010 Credit Agreement Revolving Credit Facility Letter of Credit	Aug. 19, 2010 2010 Credit Agreement Revolving Credit Facility Letter of Credit	Aug. 19, 2010 2010 Credit Agreement Revolving Credit Facility Swing Line Facility	Aug. 19, 2010 2010 Credit Agreement Term Loan Facility	Dec. 31, 2011 2010 Credit Agreement Term Loan Facility	Aug. 19, 2010 2010 Credit Agreement Term Loan Facility First Four Quarterly Installments	Aug. 19, 2010 2010 Credit Agreement Term Loan Facility Subsequent Eight Quarterly Installments	Aug. 19, 2010 2010 Credit Agreement Term Loan Facility Next Subsequent Three Quarterly Installments	Oct. 05, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 LegalMatter	Dec. 31, 2011 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020	Dec. 31, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020	Oct. 05, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 Minimum Point	Oct. 05, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 Maximum	Oct. 05, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 Semi Annual Payment, First Payment	Oct. 05, 2010 Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 Semi Annual Payment, Second Payment
Debt Disclosure [Line Items]
Notes issuance date																													2010-10-05
Aggregate amount by which the revolving credit facility can be increased																			$ 100,000,000
Credit agreement date							2010-07-02	2010-08-19
Long-term debt, aggregate principal amount																													300,000,000
Debt interest rate																													4.97%	4.97%	4.97%
Debt maturity date																			Aug. 19, 2013					Aug. 19, 2014					Oct. 05, 2020
Credit facility, maximum borrowing capacity						240,000,000	250,000,000												500,000,000
Debt maturity period							364 days
Debt issuance costs			10,779,000	6,169,000	6,169,000					10,779,000
Interest expense related to amortization of debt issuance costs									2,400,000	1,100,000
Current aggregate borrowing capacity																			400,000,000			150,000,000	40,000,000
Line of credit																								100,000,000
Line of credit facility, frequency of payment and payment terms																								The term loan facility is payable in quarterly principal installments commencing November 19, 2010. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments, 5.00% of the original principal amount for the next subsequent three quarterly installments, with the remainder becoming due at maturity.
Line of credit facility, frequency of payments																								Quarterly
Commencement date of principal payments																								2010-11-19
Description of the prepayment terms																													The Notes are prepayable at the Company's option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the Notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date
Installment amounts percentage of the original principal amount																										1.25%	2.50%	5.00%	5.00%
Applicable margin													2.75%	2.75%	3.75%	1.75%	1.75%	2.75%
Commitment fee payable to the lenders for the unused portion of the revolving credit facility									0.50%		0.50%	0.75%
Financial covenant description																													The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio for the four prior quarters of EBITDA to interest charges for that same period.
Financial covenant description								The Company must not permit its debt to capitalization ratio to exceed 45% at any time. The 2010 Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The 2010 Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization ("EBITDA") of the four prior fiscal quarters to interest charges for the same period.
Number of compliance covenants								2																					2
Debt to capitalization ratio, percentage the Company must not exceed at any time												45.00%																					50.00%
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter											3																					2.5
Line of credit, amount outstanding																				110,000,000					92,500,000
Line of credit, interest rate																				4.05%					3.25%
Unfunded letters of credit, amount outstanding		40,600,000																			40,600,000
Line of credit, available borrowing capacity																				249,000,000
Repayment of revolving credit facility	200,000,000	43,100,000	200,000,000
Long-term debt, fair value																														$ 316,000,000
Interest pay date																																		April 5	October 5
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium																																100.00%
Description of the acceptance terms																													If any offer to prepay is accepted, the purchase price of each prepaid Note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.
Acceptance terms, percent of principal before accrued and unpaid interest																													100.00%

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Quarterly Financial Information (in thousands, except per share amounts) (unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information

18. Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2010
Operating revenues	$	271,598		$	306,992	$	378,663	$	505,678
Operating income		7,831			45,757		52,509		94,828
Income from continuing operations, net of income taxes		4,186			29,528		29,374		54,810
Loss from discontinued operations, net of income taxes		—			—		—		(956	)
Net income		4,186			29,528		29,374		53,854
Basic income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.36
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
Diluted income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.35
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
2011
Operating revenues	$	567,404		$	600,064	$	673,828	$	724,647
Operating income		117,547			131,860		132,294		143,900
Income from continuing operations, net of income taxes		71,619			81,638		81,928		87,595
Loss from discontinued operations, net of income taxes		(367	)		—		—		—
Net income		71,252			81,638		81,928		87,595
Basic income (loss) per common share:
From continuing operations	$	0.46		$	0.53	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.53	$	0.53	$	0.56
Diluted income (loss) per common share:
From continuing operations	$	0.46		$	0.52	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.52	$	0.53	$	0.56

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Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Estimated useful lives

The estimated useful lives, in years, are shown below:

	Useful Lives
Drilling rigs and other equipment		1.5-15
Buildings		15-20
Other		3-12

Calculation of Income Per Share From Continuing and Discontinued Operations

The following table presents information necessary to calculate income (loss) from continuing operations per share, loss from discontinued operations per share and net income (loss) per share for the years ended December 31, 2011, 2010 and 2009, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):

	2011			2010			2009
BASIC EPS:
Income (loss) from continuing operations	$	322,780		$	117,898		$	(33,960	)
Adjust for (income) loss attributed to holders of non-vested restricted stock		(2,545	)		(884	)		313
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Loss from discontinued operations, net	$	(367	)	$	(956	)	$	(4,330	)
Adjust for loss attributed to holders of non-vested restricted stock		3			7			38
Loss from discontinued operations attributed to common stockholders	$	(364	)	$	(949	)	$	(4,292	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Basic income (loss) from continuing operations per common share	$	2.08		$	0.77		$	(0.22	)
Basic loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Basic net income (loss) per common share	$	2.08		$	0.76		$	(0.25	)
DILUTED EPS:
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Add incremental earnings related to potential common shares		—			—			—
Adjusted income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Add dilutive effect of potential common shares		1,433			504			—
Weighted average number of diluted common shares outstanding		155,304			153,276			152,069
Diluted income (loss) from continuing operations per common share	$	2.06		$	0.76		$	(0.22	)
Diluted loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Diluted net income (loss) per common share	$	2.06		$	0.76		$	(0.25	)
Potentially dilutive securities excluded as anti-dilutive		1,641			4,164			8,090

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Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2011

Management estimates

Management estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.

Revenue recognition

Revenue recognition — Revenues from daywork drilling and pressure pumping activities are recognized as services are performed. The Company follows the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and the risks therein, the Company follows the completed-contract method of accounting for such arrangements. Under this method, revenues and expenses related to a well-in-progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed total revenues. The Company recognizes as revenue reimbursements received from third parties for out-of-pocket expenses and accounts for those out-of-pocket expenses as direct costs. Except for two wells drilled under footage contacts in 2009, all of the wells the Company drilled in 2011, 2010 and 2009 were drilled under daywork contracts.

Accounts receivable

Accounts receivable — Trade accounts receivable are recorded at the invoiced amount. The allowance for doubtful accounts represents the Company’s estimate of the amount of probable credit losses existing in the Company’s accounts receivable. The Company reviews the adequacy of its allowance for doubtful accounts at least quarterly. Significant individual accounts receivable balances and balances which have been outstanding greater than 90 days are reviewed individually for collectability. Account balances, when determined to be uncollectable, are charged against the allowance.

Inventories

Inventories — Inventories consist primarily of sand and chemical products to be used in conjunction with the Company’s pressure pumping activities. The inventories are stated at the lower of cost or market, determined by the first-in, first-out method.

Property and Equipment

Property and equipment — Property and equipment is carried at cost less accumulated depreciation. Depreciation is provided on the straight-line method over the estimated useful lives. The method of depreciation does not change whenever equipment becomes idle. The estimated useful lives, in years, are shown below:

	Useful Lives
Drilling rigs and other equipment		1.5-15
Buildings		15-20
Other		3-12

Long-lived assets, including property and equipment, are evaluated for impairment when certain triggering events or changes in circumstances indicate that the carrying values may not be recoverable over their estimated remaining useful life.

Oil and Natural Gas Properties

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. Costs of exploratory wells are initially capitalized to wells-in-progress until the outcome of the drilling is known. The Company reviews wells-in-progress quarterly to determine whether sufficient progress is being made in assessing the reserves and economic viability of the respective projects. If no progress has been made in assessing the reserves and economic viability of a project after one year following the completion of drilling, the Company considers the well costs to be impaired and recognizes the costs as expense. Geological and geophysical costs, including seismic costs, and costs to carry and retain undeveloped properties are charged to expense when incurred. The capitalized costs of both developmental and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves for each respective field.

The Company reviews its proved oil and natural gas properties for impairment whenever a triggering event occurs, such as downward revisions in reserve estimates or decreases in expected future oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are prepared based on management’s expectation of future pricing over the lives of the respective fields. These cash flow estimates are reviewed by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between net book value and discounted cash flow. The discounted cash flow estimates used in measuring impairment are based on management’s expectations of future commodity prices over the life of the respective field. The Company reviews unproved oil and natural gas properties quarterly to assess potential impairment. The Company’s impairment assessment is made on a lease-by-lease basis and considers factors such as management’s intent to drill, lease terms and abandonment of an area. If an unproved property is determined to be impaired, the related property costs are expensed.

Goodwill

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. The Company assesses impairment of its goodwill at least annually as of December 31, or on an interim basis if events or circumstances indicate that the fair value of goodwill may have decreased below its carrying value.

Maintenance and Repairs

Maintenance and repairs — Maintenance and repairs are charged to expense when incurred. Renewals and betterments which extend the life or improve existing property and equipment are capitalized.

Disposals

Disposals — Upon disposition of property and equipment, the cost and related accumulated depreciation are removed and any resulting gain or loss is reflected in the consolidated statement of operations.

Net income (loss) per common share

Net income (loss) per common share — The Company provides a dual presentation of its net income (loss) per common share in its consolidated statements of operations: Basic net income (loss) per common share (“Basic EPS”) and diluted net income (loss) per common share (“Diluted EPS”).

Basic EPS excludes dilution and is computed by first allocating earnings between common stockholders and holders of non-vested shares of restricted stock. Basic EPS is then determined by dividing the earnings attributable to common stockholders by the weighted average number of common shares outstanding during the period, excluding non-vested shares of restricted stock.

Diluted EPS is based on the weighted average number of common shares outstanding plus the dilutive effect of potential common shares, including stock options, non-vested shares of restricted stock and restricted stock units. The dilutive effect of stock options and restricted stock units is determined using the treasury stock method. The dilutive effect of non-vested shares of restricted stock is based on the more dilutive of the treasury stock method or the two-class method, assuming a reallocation of undistributed earnings to common stockholders after considering the dilutive effect of potential common shares other than non-vested shares of restricted stock.

The following table presents information necessary to calculate income (loss) from continuing operations per share, loss from discontinued operations per share and net income (loss) per share for the years ended December 31, 2011, 2010 and 2009, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):

	2011			2010			2009
BASIC EPS:
Income (loss) from continuing operations	$	322,780		$	117,898		$	(33,960	)
Adjust for (income) loss attributed to holders of non-vested restricted stock		(2,545	)		(884	)		313
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Loss from discontinued operations, net	$	(367	)	$	(956	)	$	(4,330	)
Adjust for loss attributed to holders of non-vested restricted stock		3			7			38
Loss from discontinued operations attributed to common stockholders	$	(364	)	$	(949	)	$	(4,292	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Basic income (loss) from continuing operations per common share	$	2.08		$	0.77		$	(0.22	)
Basic loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Basic net income (loss) per common share	$	2.08		$	0.76		$	(0.25	)
DILUTED EPS:
Income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Add incremental earnings related to potential common shares		—			—			—
Adjusted income (loss) from continuing operations attributed to common stockholders	$	320,235		$	117,014		$	(33,647	)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		153,871			152,772			152,069
Add dilutive effect of potential common shares		1,433			504			—
Weighted average number of diluted common shares outstanding		155,304			153,276			152,069
Diluted income (loss) from continuing operations per common share	$	2.06		$	0.76		$	(0.22	)
Diluted loss from discontinued operations per common share	$	0.00		$	(0.01	)	$	(0.03	)
Diluted net income (loss) per common share	$	2.06		$	0.76		$	(0.25	)
Potentially dilutive securities excluded as anti-dilutive		1,641			4,164			8,090

Income taxes

Income taxes — The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for operating loss and tax credit carryforwards and 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 enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the enactment date. If applicable, a valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized. The Company’s policy is to account for interest and penalties with respect to income taxes as operating expenses.

Stock-based compensation

Stock-based compensation — The Company recognizes the cost of share-based payments under the fair-value-based method. Under this method, compensation cost related to share-based payments is measured based on the estimated fair value of the awards at the date of grant, net of estimated forfeitures. This expense is recognized over the expected life of the awards (See Note 11).

Statement of cash flows

Statement of cash flows — For purposes of reporting cash flows, cash and cash equivalents include cash on deposit and money market funds.

Recently Issued Accounting Standards

Recently Issued Accounting Standards — In September 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update that simplifies how entities test goodwill for impairment. This update permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. Previous guidance required an entity to test goodwill for impairment, on at least an annual basis, by comparing the fair value of a reporting unit with its carrying amount. If the fair value of a reporting unit is less than its carrying amount, then the second step of the test must be performed to measure the amount of the impairment loss, if any. Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount. This update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted if an entity’s financial statements for the most recent annual or interim period have not yet been issued. The Company has elected to early adopt this accounting standard update as of December 31, 2011 as discussed further in Note 5.

In June 2011, the FASB issued an accounting standard update that requires that all non-owner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present total net income and its components followed consecutively by a second statement that should present total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. Historically, these components of other comprehensive income and total comprehensive income have been presented in the statement of changes in stockholders’ equity by many companies, including the Company. This requirement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will result in the addition of a new consolidated statement of comprehensive income to the Company’s consolidated financial statements beginning with the quarter ending March 31, 2012.

In May 2011, the FASB issued an accounting standard update to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with United States GAAP and International Financial Reporting Standards. The amendments in this update do not require additional fair value measurements, but provide additional guidance as to measuring fair value as well as certain additional disclosure requirements. The requirements in this update are effective during interim and annual periods beginning after December 15, 2011 and will be effective for the Company in the quarter ending March 31, 2012. The adoption of this update will not have a material impact on the Company’s disclosures included in its consolidated financial statements.

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Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Contract Drilling	Dec. 31, 2009 Contract Drilling	Dec. 31, 2011 Pressure Pumping	Dec. 31, 2010 Pressure Pumping
Goodwill [Line Items]
Beginning Balance	$ 153,809	$ 86,234	$ 86,234	$ 86,234	$ 67,575
Changes to goodwill
Acquisition		67,575				67,575
Ending Balance	$ 153,809	$ 153,809	$ 86,234	$ 86,234	$ 67,575	$ 67,575

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VALUATION AND QUALIFYING ACCOUNTS (Tables)

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

Description	Beginning Balance		Charged to Costs and Expenses			Deductions(1)		Ending Balance
	(In thousands)
Year Ended December 31, 2011
Deducted from asset accounts:
Allowance for doubtful accounts	$	5,114	$	0		$	227	$	4,887
Year Ended December 31, 2010
Deducted from asset accounts:
Allowance for doubtful accounts	$	10,911	$	(2,000	)	$	3,797	$	5,114
Year Ended December 31, 2009
Deducted from asset accounts:
Allowance for doubtful accounts	$	9,330	$	4,700		$	3,119	$	10,911

(1) Consists of uncollectible accounts written off.

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Operating Results from Discontinued Operations

Summarized operating results from discontinued operations for the years ended December 31, 2011, 2010 and 2009 are shown below (in thousands):

	2011			2010			2009
Drilling and completion fluids revenues	$	—		$	3,737		$	79,786
Electric wireline revenues		1,104			5,712			—
Operating revenues from discontinued operations	$	1,104		$	9,449		$	79,786
Loss from discontinued operations before income taxes	$	(576	)	$	(1,499	)	$	(6,538	)
Income tax benefit		209			543			2,208
Loss from discontinued operations	$	(367	)	$	(956	)	$	(4,330	)

Components of Assets Held for Sale

The components of assets held for sale at December 31, 2010 are shown below (in thousands):

Assets held for sale:
Inventory	$	756
Property and equipment, net		24,769
Reserve to reduce disposal group to fair value less costs to sell		(2,155	)
Total assets held for sale	$	23,370

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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Purchase Price Allocation

A summary of the purchase price allocation follows (in thousands):

Sand and chemical inventory	$	6,848
Supplies		312
Property and equipment		154,359
Non-compete agreement		1,400
Customer relationships		25,500
Deferred tax asset		8,514
Goodwill		67,575
Below-market pricing agreements		(23,200	)
Total purchase price	$	241,308

Business Acquisition Pro-forma Unaudited Financial Information

The following represents pro-forma unaudited financial information for the years ended December 31, 2010 and 2009 as if the acquisition had been completed on January 1, 2009 (in thousands, except per share amounts):

	2010		2009
	(Unaudited)
Revenue	$	1,660,635	$	905,168
Income (loss) from continuing operations	$	127,257	$	(46,807	)
Net income (loss)	$	126,301	$	(51,137	)
Basic income (loss) from continuing operations per common share	$	0.83	$	(0.33	)
Basic net income (loss) per common share	$	0.83	$	(0.36	)
Diluted income (loss) from continuing operations per common share	$	0.82	$	(0.33	)
Diluted net income (loss) per common share	$	0.82	$	(0.36	)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest expense, capitalized interest	$ 8,415	$ 2,288	$ 0

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property and Equipment

Property and equipment consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011			2010
Equipment	$	4,730,925		$	3,972,891
Oil and natural gas properties		131,812			110,749
Buildings		64,090			61,425
Land		11,467			11,074
		4,938,294			4,156,139
Less accumulated depreciation and depletion		(1,771,028	)		(1,535,239	)
Property and equipment, net	$	3,167,266		$	2,620,900

Summary of Depreciation, Depletion, Amortization and Impairment Expense Related to Property and Equipment and Intangible Assets

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2011, 2010 and 2009 (in millions):

	2011		2010		2009
Depreciation and impairment expense	$	419.2	$	322.3	$	280.6
Amortization expense		4.1		1.0		—
Depletion expense		14.0		10.2		9.2
Total	$	437.3	$	333.5	$	289.8

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Business Segments - Revenues (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting, Revenue Reconciling Item [Line Items]
Oil and natural gas	$ 50,559		$ 30,425		$ 21,218
Revenues	2,565,943		1,462,931		781,946
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Oil and natural gas	50,559		30,425		21,218
Revenues	2,569,991		1,466,755		783,082
Operating Segments | Contract Drilling
Segment Reporting, Revenue Reconciling Item [Line Items]
Oil and gas services	1,673,629		1,085,722		600,423
Operating Segments | Pressure Pumping
Segment Reporting, Revenue Reconciling Item [Line Items]
Oil and gas services	845,803		350,608		161,441
Intersegment Elimination
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (4,048)	[1]	$ (3,824)	[1]	$ (1,136)	[1]

[1] Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.

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Business Segments (Tables)

12 Months Ended

Dec. 31, 2011

Business Segments - Financial Information

The following tables summarize selected financial information relating to the Company’s business segments (in thousands):

	Years Ended December 31,
	2011			2010			2009
Revenues:
Contract drilling	$	1,673,629		$	1,085,722		$	600,423
Pressure pumping		845,803			350,608			161,441
Oil and natural gas		50,559			30,425			21,218
Total segment revenues		2,569,991			1,466,755			783,082
Elimination of intercompany revenues(a)		(4,048	)		(3,824	)		(1,136	)
Total revenues	$	2,565,943		$	1,462,931		$	781,946
Income (loss) from continuing operations before income taxes:
Contract drilling	$	346,083		$	140,483		$	(11,219	)
Pressure pumping		193,440			62,194			1,017
Oil and natural gas		23,982			12,455			950
		563,505			215,132			(9,252	)
Corporate and other		(42,903	)		(37,019	)		(35,577	)
Net (loss) gain on asset disposals(b)		4,999			22,812			(3,385	)
Interest income		187			1,674			381
Interest expense		(15,652	)		(12,772	)		(4,148	)
Other		582			927			426
Income (loss) from continuing operations before income taxes	$	510,718		$	190,754		$	(51,555	)
Identifiable assets:
Contract drilling	$	3,252,116		$	2,678,250		$	2,129,567
Pressure pumping		748,643			533,597			213,094
Oil and natural gas		44,990			36,508			25,355
Corporate and other(c)		176,152			174,676			294,136
Total assets	$	4,221,901		$	3,423,031		$	2,662,152
Depreciation, depletion, amortization and impairment:
Contract drilling	$	344,312		$	280,458		$	248,424
Pressure pumping		73,279			40,724			27,589
Oil and natural gas		16,962			10,950			12,927
Corporate and other		2,726			1,361			907
Total depreciation, depletion, amortization and impairment	$	437,279		$	333,493		$	289,847
Capital expenditures:
Contract drilling	$	784,686		$	655,550		$	395,376
Pressure pumping		198,061			51,064			43,144
Oil and natural gas		22,884			23,067			7,341
Corporate and other		5,947			8,409			6,785
Total capital expenditures	$	1,011,578		$	738,090		$	452,646

(a) Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.

(b) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

(c) Corporate and other assets primarily include identifiable assets associated with assets held for sale as well as cash on hand, income taxes receivable and certain deferred federal income tax assets.

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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Equipment	$ 4,730,925	$ 3,972,891
Oil and natural gas properties	131,812	110,749
Buildings	64,090	61,425
Land	11,467	11,074
Property, Plant and Equipment, Gross, Total	4,938,294	4,156,139
Less accumulated depreciation and depletion	(1,771,028)	(1,535,239)
Property and equipment, net	$ 3,167,266	$ 2,620,900

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Additional Information with Respect to Non-vested Options (Detail) (Employee Stock Option, USD $) In Millions, unless otherwise specified	Dec. 31, 2011 Year
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value	$ 3.3
Weighted-average remaining contractual term	8.56
Weighted-average remaining expected term	3.45
Weighted-average remaining vesting period	1.52
Unrecognized compensation cost	$ 6.7

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 23,946	$ 27,612
Accounts receivable, net of allowance for doubtful accounts of $4,887 and $5,114 at December 31, 2011 and 2010, respectively	518,109	337,167
Federal and state income taxes receivable		75,062
Inventory	31,306	17,215
Deferred tax assets, net	142,725	26,815
Assets held for sale		23,370
Other	48,864	50,169
Total current assets	764,950	557,410
Property and equipment, net	3,167,266	2,620,900
Goodwill and intangible assets	175,573	179,683
Deposits on equipment purchases	99,543	51,084
Other	14,569	13,954
Total assets	4,221,901	3,423,031
Current liabilities:
Accounts payable	241,610	162,400
Federal and state income taxes payable	2,473
Accrued expenses	164,629	147,315
Current portion of long-term debt	10,000	6,250
Total current liabilities	418,712	315,965
Borrowings under revolving credit facility	110,000
Other long-term debt	382,500	392,500
Deferred tax liabilities, net	786,632	511,422
Other	7,426	15,537
Total liabilities	1,705,270	1,235,424
Commitments and contingencies (see Note 9)
Stockholders' equity:
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued
Common stock, par value $.01; authorized 300,000,000 shares with 183,295,350 and 181,537,568 issued and 155,807,779 and 154,193,754 outstanding at December 31, 2011 and 2010, respectively	1,833	1,815
Additional paid-in capital	840,731	796,641
Retained earnings	2,279,367	1,987,999
Accumulated other comprehensive income	19,459	21,597
Treasury stock, at cost, 27,487,571 shares and 27,343,814 shares at December 31, 2011 and 2010, respectively	(624,759)	(620,445)
Total stockholders' equity	2,516,631	2,187,607
Total liabilities and stockholders' equity	$ 4,221,901	$ 3,423,031

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Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2011 Year
Drilling rigs and other equipment
Property, Plant and Equipment [Line Items]
Useful Lives, minimum	1.5
Useful Lives, maximum	15
Buildings
Property, Plant and Equipment [Line Items]
Useful Lives, minimum	15.0
Useful Lives, maximum	20
Other
Property, Plant and Equipment [Line Items]
Useful Lives, minimum	3.0
Useful Lives, maximum	12

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Foreign currency translation adjustment, tax	$ 2,814	$ 5,347

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Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]
Salaries, wages, payroll taxes and benefits	$ 58,692	$ 39,866
Workers' compensation liability	66,121	63,011
Property, sales, use and other taxes	11,850	6,682
Insurance, other than workers' compensation	6,012	12,648
Accrued interest payable	4,937	4,879
Deferred revenue - current	7,229	10,220
2009 Performance Unit Awards	3,640
Other	6,148	10,009
Accrued expenses	$ 164,629	$ 147,315

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Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2011

Changes to the Company's Asset Retirement Obligations

The following table describes the changes to the Company’s asset retirement obligations during 2011 and 2010 (in thousands):

	2011			2010
Balance at beginning of year	$	3,063		$	2,955
Liabilities incurred		361			335
Liabilities settled		(110	)		(339	)
Accretion expense		143			112
Revision in estimated costs of plugging oil and natural gas wells		(2	)		—
Asset retirement obligation at end of year	$	3,455		$	3,063

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Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders Equity Note [Line Items]
Cash dividends paid, date	Dec. 30, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 30, 2011	Dec. 30, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 30, 2010	Dec. 30, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009
Cash dividends paid, per share	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.20	$ 0.20	$ 0.20
Cash dividends paid	$ 7,788	$ 7,777	$ 7,772	$ 7,708	$ 7,709	$ 7,704	$ 7,706	$ 7,677	$ 7,676	$ 7,675	$ 7,675	$ 7,655	$ 31,045	$ 30,796	$ 30,681

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Employee Benefits

12 Months Ended

Dec. 31, 2011

Employee Benefits

14. Employee Benefits

The Company maintains a 401(k) plan for all eligible employees. The Company’s operating results include expenses of approximately $4.6 million in 2011, $3.1 million in 2010 and $2.8 million in 2009 for the Company’s cash contributions to the plan.

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Long Term Debt (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of the Principal Repayment Requirements of Long Term Debt

Presented below is a schedule of the principal repayment requirements of long-term debt by fiscal year as of December 31, 2011 (in thousands):

Year ending December 31,
2012	$	10,000
2013		122,500
2014		70,000
2015		—
2016		—
Thereafter		300,000
Total	$	502,500

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Concentrations of Credit Risk

12 Months Ended

Dec. 31, 2011

Concentrations of Credit Risk

16. Concentrations of Credit Risk

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of demand deposits, temporary cash investments and trade receivables.

The Company believes it has placed its demand deposits and temporary cash investments with high credit-quality financial institutions. At December 31, 2011 and 2010, the Company’s demand deposits and temporary cash investments consisted of the following (in thousands):

	2011			2010
Deposits in FDIC and SIPC-insured institutions under insurance limits	$	289		$	1,523
Deposits in FDIC and SIPC-insured institutions over insurance limits		50,035			51,625
Deposits in foreign banks		18,823			11,533
		69,147			64,681
Less outstanding checks and other reconciling items		(45,201	)		(37,069	)
Cash and cash equivalents	$	23,946		$	27,612

Concentrations of credit risk with respect to trade receivables are primarily focused on companies involved in the exploration and development of oil and natural gas properties. The concentration is somewhat mitigated by the diversification of customers for which the Company provides services. As is general industry practice, the Company typically does not require customers to provide collateral. No significant losses from individual customers were experienced during the years ended December 31, 2011, 2010 or 2009. No provision for bad debts was recognized in 2011. The Company recorded a provision for bad debts for 2010 and 2009 of $(2.0) million and $3.8 million, respectively.

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Company's Share-based Compensation Plans (Detail)	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized for Grant		15,250,000
Awards Outstanding	7,081,295	7,710,102
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized for Grant	15,250,000
Awards Outstanding	6,293,495
Shares Available for Grant	4,399,951
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	1,983,300
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan ("2001 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	35,800

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 322,413		$ 116,942		$ (38,290)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment	437,279		333,493		289,847
Provision for bad debts	0		(2,000)		3,810
Dry holes and abandonments	1,213		519		129
Deferred income tax expense	158,967		147,490		101,443
Stock-based compensation expense	20,904		16,779		18,214
Net (gain) loss on asset disposals	(4,999)	[1]	(22,812)	[1]	3,385	[1]
Tax expense related to stock-based compensation			(2,291)		(3,004)
Changes in operating assets and liabilities:
Accounts receivable	(183,165)		(178,444)		213,813
Income taxes receivable/payable	77,618		43,522		(108,664)
Inventory and other assets	(13,491)		(8,772)		14,178
Accounts payable	41,995		49,576		(52,673)
Accrued expenses	18,313		18,072		(21,178)
Other liabilities	(8,111)		3,234		(92)
Net cash provided by (used in) operating activities of discontinued operations	(339)		10,390		32,759
Net cash provided by operating activities	868,597		525,698		453,677
Cash flows from investing activities:
Acquisitions			(238,022)
Purchases of property and equipment	(1,011,578)		(738,090)		(452,646)
Proceeds from disposal of assets	22,495		29,409		3,359
Net cash provided by (used in) investing activities of discontinued operations	25,500		42,638		(54)
Net cash used in investing activities	(963,583)		(904,065)		(449,341)
Cash flows from financing activities:
Purchases of treasury stock	(4,314)		(1,853)		(1,623)
Dividends paid	(31,045)		(30,796)		(30,681)
Tax benefit related to stock-based compensation	6,393
Proceeds from long-term debt			400,000
Repayment of long-term debt	(6,250)		(1,250)
Proceeds from borrowings under revolving credit facility	153,100		200,000
Repayment of borrowings under revolving credit facility	(43,100)		(200,000)
Debt issuance costs			(10,779)		(6,169)
Proceeds from exercise of stock options	16,811		525		569
Net cash provided by (used in) financing activities	91,595		355,847		(37,904)
Effect of foreign exchange rate changes on cash	(275)		255		2,222
Net decrease in cash and cash equivalents	(3,666)		(22,265)		(31,346)
Cash and cash equivalents at beginning of year	27,612		49,877		81,223
Cash and cash equivalents at end of year	23,946		27,612		49,877
Net cash (paid) received during the year for:
Interest, net of capitalized interest of $8,415 in 2011, $2,288 in 2010 and $0 in 2009	(13,177)		(2,220)		1,804
Income taxes	59,251		115,666		14,029
Non-cash investing and financing activities:
Net increase (decrease) in payables for purchases of property and equipment	37,838		29,188		(25,110)
Net (increase) decrease in deposits on equipment purchases	$ (48,459)		$ (50,170)		$ 43,029

[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 4,887	$ 5,114
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	183,295,350	181,537,568
Common stock, outstanding	155,807,779	154,193,754
Treasury stock, shares	27,487,571	27,343,814

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Commitments, Contingencies and Other Matters

12 Months Ended

Dec. 31, 2011

Commitments, Contingencies and Other Matters

9. Commitments, Contingencies and Other Matters

Commitments — As of December 31, 2011, the Company maintained letters of credit in the aggregate amount of $40.6 million for the benefit of various insurance companies as collateral for retrospective premiums and retained losses which could become payable under the terms of the underlying insurance contracts. These letters of credit expire annually at various times during the year and are typically renewed. As of December 31, 2011, no amounts had been drawn under the letters of credit.

As of December 31, 2011, the Company had commitments to purchase approximately $352 million of major equipment for its drilling and pressure pumping businesses.

The Company’s pressure pumping business has entered into agreements to purchase minimum quantities of proppants from certain vendors. These agreements expire in 2013 and 2016. As of December 31, 2011, the remaining obligation under these agreements is approximately $42.5 million, of which materials with a total purchase price of approximately $13.5 million are expected to be delivered during 2012. In the event that the required minimum quantities are not purchased during any contract year, the Company would be required to make a liquidated damages payment to the respective vendor for any shortfall.

In November of 2011, the Company’s pressure pumping business entered into an agreement with a proppant vendor to advance, on a non-revolving basis, up to $12.0 million to such vendor to finance the construction of certain processing facilities. This advance is secured by the underlying processing facilities and bears interest at an annual rate of 5.0%. Repayment of the advance is to be made through discounts applied to purchases from the vendor and repayment of all amounts advanced must be made no later than October 1, 2017. As of December 31, 2011, advances of approximately $2.9 million had been made under this agreement and no significant repayments had been made.

Contingencies — The Company’s operations are subject to many hazards inherent in the contract drilling and pressure pumping businesses, including inclement weather, blowouts, well fires, loss of well control, pollution and reservoir damage. These hazards could cause personal injury or death, work stoppage, and serious damage to equipment and other property. The Company’s operations could also cause significant environmental and reservoir damages. These risks could expose the Company to substantial liability for personal injury, wrongful death, property damage, loss of oil and natural gas production, pollution and other environmental damages.

Any contractual right to indemnification that the Company may have for any such risk, may be unenforceable or limited due to negligent or willful acts of commission or omission by the Company, its subcontractors and/or suppliers. The Company’s customers may dispute, or be unable to meet, their contractual indemnification obligations to the Company due to financial, legal or other reasons. Accordingly, the Company may be unable to transfer these risks to its customers by contract or indemnification agreements. Incurring a liability for which the Company is not fully indemnified or insured could have a material adverse effect on its business, financial condition, cash flows and results of operations.

The Company has insurance coverage for comprehensive general liability, automobile liability, workers’ compensation and employer’s liability, and certain other specific risks. The Company has also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. For example, the Company generally maintains a $1.0 million per occurrence deductible on its workers’ compensation and equipment insurance coverages and a $2.0 million per occurrence self insured retention on its general liability insurance coverage. The Company self-insures a number of other risks, including loss of earnings and business interruption, and does not carry a significant amount of insurance to cover risks of underground reservoir damage. If a significant accident or other event occurs and is not fully covered by insurance or an enforceable or recoverable indemnity from a customer, it could have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations. Accrued expenses related to insurance claims are set forth in Note 6.

The Company is party to various legal proceedings arising in the normal course of its business. The Company does not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition, results of operations or cash flows.

Other Matters — The Company has Change in Control Agreements with its Chairman of the Board, Chief Executive Officer, two Senior Vice Presidents and its General Counsel (the “Key Employees”). Each Change in Control Agreement generally has an initial term with automatic twelve-month renewals unless the Company notifies the Key Employee at least ninety days before the end of such renewal period that the term will not be extended. If a change in control of the Company occurs during the term of the agreement and the Key Employee’s employment is terminated (i) by the Company other than for cause or other than automatically as a result of death, disability or retirement, or (ii) by the Key Employee for good reason (as those terms are defined in the Change in Control Agreements), then the Key Employee shall generally be entitled to, among other things:

• a bonus payment equal to the greater of the highest bonus paid after the Change in Control Agreement was entered into and the average of the two annual bonuses earned in the two fiscal years immediately preceding a change in control (such bonus payment prorated for the portion of the fiscal year preceding the termination date);

• a payment equal to 2.5 times (in the case of the Chairman of the Board and Chief Executive Officer), 2 times (in the case of the Senior Vice Presidents) or 1.5 times (in the case of the General Counsel) of the sum of (i) the highest annual salary in effect for such Key Employee and (ii) the average of the three annual bonuses earned by the Key Employee for the three fiscal years preceding the termination date; and

• continued coverage under the Company’s welfare plans for up to three years (in the case of the Chairman of the Board and Chief Executive Officer) or two years (in the case of the Senior Vice Presidents and General Counsel).

Each Change in Control Agreement provides the Key Employee with a full gross-up payment for any excise taxes imposed on payments and benefits received under the Change in Control Agreements or otherwise, including other taxes that may be imposed as a result of the gross-up payment.

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Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 5,114		$ 10,911		$ 9,330
Charged to Costs and Expenses	0		(2,000)		4,700
Deductions	227	[1]	3,797	[1]	3,119	[1]
Ending Balance	$ 4,887		$ 5,114		$ 10,911

[1] Consists of uncollectible accounts written off.

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Fair Values of Financial Instruments - Additional Information (Detail) (Series A, Senior Notes, 4.97 Percent, Due October 5th 2020)	Dec. 31, 2011	Dec. 31, 2010	Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt interest rate	4.97%	4.97%	4.97%

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Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011	Feb. 09, 2012	Jun. 30, 2011
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Trading Symbol	PTEN
Entity Registrant Name	PATTERSON UTI ENERGY INC
Entity Central Index Key	0000889900
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		155,818,409
Entity Public Float			$ 4,800,000,000

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Stockholder' Equity

12 Months Ended

Dec. 31, 2011

Stockholder' Equity

10. Stockholders’ Equity

Cash Dividends — The Company paid cash dividends during the years ended December 31, 2009, 2010 and 2011 as follows:

	Per Share		Total
			(in thousands)
2009:
Paid on March 31, 2009	$	0.05	$	7,655
Paid on June 30, 2009		0.05		7,675
Paid on September 30, 2009		0.05		7,675
Paid on December 30, 2009		0.05		7,676
Total cash dividends	$	0.20	$	30,681
2010:
Paid on March 30, 2010	$	0.05	$	7,677
Paid on June 30, 2010		0.05		7,706
Paid on September 30, 2010		0.05		7,704
Paid on December 30, 2010		0.05		7,709
Total cash dividends	$	0.20	$	30,796
2011:
Paid on March 30, 2011	$	0.05	$	7,708
Paid on June 30, 2011		0.05		7,772
Paid on September 30, 2011		0.05		7,777
Paid on December 30, 2011		0.05		7,788
Total cash dividends	$	0.20	$	31,045

On February 1, 2012, the Company’s Board of Directors approved a cash dividend on its common stock in the amount of $0.05 per share to be paid on March 30, 2012 to holders of record as of March 15, 2012. The amount and timing of all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of the Company’s credit facilities and other factors.

On August 1, 2007, the Company’s Board of Directors approved a stock buyback program authorizing purchases of up to $250 million of the Company’s common stock in open market or privately negotiated transactions. During the year ended December 31, 2009, the Company purchased 5,715 shares of its common stock under the program at a cost of approximately $79,000. During the year ended December 31, 2010, the Company purchased 8,743 shares of its common stock under the program at a cost of approximately $123,000. During the year ended December 31, 2011, the Company purchased 8,689 shares of its common stock under the program at a cost of approximately $255,000. As of December 31, 2011, the Company is authorized to purchase approximately $113 million of the Company’s outstanding common stock under the program. Shares purchased under the program are accounted for as treasury stock.

The Company purchased 135,068, 117,083 and 114,983 shares of treasury stock from employees during 2011, 2010 and 2009, respectively. These shares were purchased at fair market value upon the vesting of restricted stock to provide the employees with the funds necessary to satisfy payroll tax withholding obligations. The total purchase price for these shares was approximately $4.1 million, $1.7 million and $1.5 million in 2011, 2010 and 2009, respectively. These purchases were made pursuant to the terms of the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (the “2005 Plan”) and not pursuant to the stock buyback program.

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Tax effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	$ 157,380	$ 41,944	$ 44,240
Net Change	115,436	(2,296)	(4,095)
Beginning Balance	41,944	44,240	48,335
Ending Balance	62,092	46,903	42,418
Net Change	15,189	4,485	13,938
Beginning Balance	46,903	42,418	28,480
Ending Balance	219,472	88,847	86,658
Net Change	130,625	2,189	9,843
Beginning Balance	88,847	86,658	76,815
Ending Balance	(848,724)	(558,325)	(424,074)
Net Change	(290,399)	(134,251)	(117,877)
Beginning Balance	(558,325)	(424,074)	(306,197)
Ending Balance	(863,379)	(573,454)	(435,437)
Net Change	(289,925)	(138,017)	(116,833)
Beginning Balance	(573,454)	(435,437)	(318,604)
Ending Balance	(643,907)	(484,607)	(348,779)
Net Change	(159,300)	(135,828)	(106,990)
Beginning Balance	(484,607)	(348,779)	(241,789)
Net Operating Loss Carryforwards
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	114,576
Net Change	114,576
Ending Balance	18,434	6,465	4,872
Net Change	11,969	1,593	4,872
Beginning Balance	6,465	4,872
Workers Compensation Allowance
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	24,004	23,290	24,624
Net Change	714	(1,334)	(1,360)
Beginning Balance	23,290	24,624	25,984
Other
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	18,800	18,654	19,616
Net Change	146	(962)	(2,735)
Beginning Balance	18,654	19,616	22,351
Ending Balance	10,670	16,031	9,485
Net Change	(5,361)	6,546	4,120
Beginning Balance	16,031	9,485	5,365
Ending Balance	(14,655)	(15,129)	(11,363)
Net Change	474	(3,766)	1,044
Beginning Balance	(15,129)	(11,363)	(12,407)
Ending Balance	(12,901)	(11,670)	(10,961)
Net Change	(1,231)	(709)	(7,091)
Beginning Balance	(11,670)	(10,961)	(3,870)
Federal benefit of foreign deferred tax liabilities
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance			9,160
Net Change		(9,160)	(256)
Beginning Balance		9,160	9,416
Federal benefit of state deferred tax liabilities
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	20,260	13,155	9,772
Net Change	7,105	3,383	2,702
Beginning Balance	13,155	9,772	7,070
Expense associated with employee stock options
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	12,728	11,252	9,129
Net Change	1,476	2,123	2,500
Beginning Balance	11,252	9,129	6,629
Property and equipment basis difference
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Ending Balance	(835,823)	(546,655)	(413,113)
Net Change	(289,168)	(133,542)	(110,786)
Beginning Balance	$ (546,655)	$ (413,113)	$ (302,327)

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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	$ 502,500	$ 398,750
Carrying (Reported) Amount, Fair Value Disclosure | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	110,000
Carrying (Reported) Amount, Fair Value Disclosure | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	92,500	98,750
Carrying (Reported) Amount, Fair Value Disclosure | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	300,000	300,000
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	518,442	388,375
Estimate of Fair Value, Fair Value Disclosure | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	110,000
Estimate of Fair Value, Fair Value Disclosure | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	92,500	98,750
Estimate of Fair Value, Fair Value Disclosure | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	$ 315,942	$ 289,625

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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Operating revenues:
Oil and natural gas	$ 50,559		$ 30,425		$ 21,218
Total operating revenues	2,565,943		1,462,931		781,946
Operating costs and expenses:
Contract drilling	972,778		655,678		357,742
Pressure pumping	561,398		235,100		124,100
Oil and natural gas	9,615		7,020		7,341
Depreciation, depletion, amortization and impairment	437,279		333,493		289,847
Selling, general and administrative	64,271		53,042		43,935
Net (gain) loss on asset disposals	(4,999)	[1]	(22,812)	[1]	3,385	[1]
Provision for bad debts	0		(2,000)		3,810
Acquisition-related expenses			2,485
Total operating costs and expenses	2,040,342		1,262,006		830,160
Operating income (loss)	525,601		200,925		(48,214)
Other income (expense):
Interest income	187		1,674		381
Interest expense	(15,652)		(12,772)		(4,148)
Other	582		927		426
Total other expense	(14,883)		(10,171)		(3,341)
Income (loss) from continuing operations before income taxes	510,718		190,754		(51,555)
Income tax expense (benefit):
Current	28,971		(74,634)		(119,038)
Deferred	158,967		147,490		101,443
Total income tax expense (benefit)	187,938		72,856		(17,595)
Income (loss) from continuing operations	322,780		117,898		(33,960)
Loss from discontinued operations, net of income taxes	(367)		(956)		(4,330)
Net income (loss)	322,413		116,942		(38,290)
Basic income (loss) per common share:
Income (loss) from continuing operations	$ 2.08		$ 0.77		$ (0.22)
Loss from discontinued operations, net of income taxes	$ 0.00		$ (0.01)		$ (0.03)
Net income (loss)	$ 2.08		$ 0.76		$ (0.25)
Diluted income (loss) per common share:
Income (loss) from continuing operations	$ 2.06		$ 0.76		$ (0.22)
Loss from discontinued operations, net of income taxes	$ 0.00		$ (0.01)		$ (0.03)
Net income (loss)	$ 2.06		$ 0.76		$ (0.25)
Weighted average number of common shares outstanding:
Basic	153,871		152,772		152,069
Diluted	155,304		153,276		152,069
Cash dividends per common share	$ 0.20		$ 0.20		$ 0.20
Contract Drilling
Operating revenues:
Oil and gas services	1,669,581		1,081,898		599,287
Pressure Pumping
Operating revenues:
Oil and gas services	$ 845,803		$ 350,608		$ 161,441

[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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Property and Equipment

12 Months Ended

Dec. 31, 2011

Property and Equipment

4. Property and Equipment

Property and equipment consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011			2010
Equipment	$	4,730,925		$	3,972,891
Oil and natural gas properties		131,812			110,749
Buildings		64,090			61,425
Land		11,467			11,074
		4,938,294			4,156,139
Less accumulated depreciation and depletion		(1,771,028	)		(1,535,239	)
Property and equipment, net	$	3,167,266		$	2,620,900

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2011, 2010 and 2009 (in millions):

	2011		2010		2009
Depreciation and impairment expense	$	419.2	$	322.3	$	280.6
Amortization expense		4.1		1.0		—
Depletion expense		14.0		10.2		9.2
Total	$	437.3	$	333.5	$	289.8

The Company evaluates the recoverability of its long-lived assets whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable (a “triggering event”). In light of adverse market conditions affecting the Company beginning in the fourth quarter of 2008 and continuing into 2009, including a substantial decrease in the operating levels of its contract drilling business segment and a significant decline in oil and natural gas commodity prices, the Company determined that a triggering event had occurred and deemed it necessary to perform an assessment with respect to impairment of long-lived assets, including property and equipment, within its contract drilling segment in 2009. In light of favorable trends in rig utilization and revenue per operating day experienced by the Company and its peers in 2010 and 2011, management concluded that no triggering event had occurred in 2010 or 2011 with respect to its contract drilling segment as a whole (excluding the rigs which had been removed from the Company’s marketable fleet as discussed below). The Company concluded that no triggering event occurred with respect to its pressure pumping segment in 2011, 2010 or 2009. With respect to the long-lived assets in the Company’s oil and natural gas exploration and production segment, the Company assesses the recoverability of long-lived assets at the end of each quarter due to revisions in its oil and natural gas reserve estimates and expectations about future commodity prices.

Long-lived assets are evaluated for impairment at the lowest level for which identifiable cash flows can be separated from other long-lived assets. The Company performs the first step of its impairment assessments by comparing the undiscounted cash flows for each long-lived asset or asset group to its respective carrying value. Based on the results of these impairment tests, the carrying amounts of long-lived assets in the contract drilling and oil and natural gas segments were determined to be recoverable, except as described below.

The Company’s analysis indicated that the carrying amounts of certain oil and natural gas properties were not recoverable at various testing dates in 2011, 2010 and 2009. The Company’s estimates of expected future net cash flows from impaired properties are used in measuring the fair value of such properties. The Company recorded impairment charges of $3.0 million, $792,000 and $3.7 million in 2011, 2010 and 2009, respectively, related to its oil and natural gas properties. The Company determined the fair value of the impaired assets using internally developed unobservable inputs including future pricing and reserves (level 3 inputs in the fair value hierarchy of fair value accounting).

On a periodic basis, the Company evaluates its fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type (such as drilling conventional vertical wells versus drilling longer horizontal wells using high capacity rigs). In connection with the Company’s ongoing planning process, it evaluated its then-current fleet of marketable drilling rigs in 2011, 2010 and 2009 and identified 53, four and 23 rigs, during each of those years respectively, that it determined were impaired and would no longer be marketed as rigs based on its assessment of estimated expenditures to bring these rigs into condition to operate in the current environment as well as its assessment of future demand and the suitability of the identified rigs in light of this expected demand. The components comprising these rigs were evaluated, and those components with continuing utility to the Company’s other marketed rigs were transferred to other rigs or to its yards to be used as spare equipment. The fair value of the remaining components of these rigs was estimated to be zero as there was no future cash flow expected and the associated net book value of $15.7 million in 2011, $4.2 million in 2010 and $10.5 million in 2009 was expensed in the Company’s consolidated statements of operations as an impairment charge.

During 2010, the Company sold certain rights to explore and develop zones deeper than depths that it generally targets for certain of the oil and natural gas properties in which it has working interests. The proceeds from this sale were approximately $22.3 million and the sale resulted in a gain on disposal of $20.1 million.

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Acquisitions

12 Months Ended

Dec. 31, 2011

Acquisitions

3. Acquisitions

On October 1, 2010, two subsidiaries of the Company, Universal Pressure Pumping, Inc. and Universal Wireline, Inc., completed the acquisition of certain assets from Key Energy Pressure Pumping Services, LLC and Key Electric Wireline Services, LLC relating to the businesses of providing pressure pumping services and electric wireline services to participants in the oil and natural gas industry. This acquisition expanded the Company’s pressure pumping operations to additional markets primarily in Texas. The aggregate purchase price was approximately $241 million and was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on fair value. The tangible assets acquired include property and equipment, inventories of sand and chemicals on hand and repair and maintenance supplies on hand. The identifiable intangible assets acquired include an agreement by the seller to not compete for a period of three years and the customer relationships in place at the time of the acquisition. The liabilities assumed arose from pricing agreements in place with certain customers that had pricing below current market rates. A related deferred tax asset was recognized to reflect the temporary difference associated with these below-market pricing arrangements. The excess of the purchase price over the fair values of the tangible assets, the identifiable intangible assets and deferred tax asset, net of the liabilities assumed, is recorded as goodwill and was attributed to the pressure pumping business acquired. A summary of the purchase price allocation follows (in thousands):

Sand and chemical inventory	$	6,848
Supplies		312
Property and equipment		154,359
Non-compete agreement		1,400
Customer relationships		25,500
Deferred tax asset		8,514
Goodwill		67,575
Below-market pricing agreements		(23,200	)
Total purchase price	$	241,308

In addition to the purchase price, acquisition-related expenses associated with this transaction of approximately $2.5 million were incurred by the Company and are presented in the consolidated statement of operations under the caption “acquisition-related expenses” for the year ended December 31, 2010. These expenses include certain legal and other professional fees directly related to the transaction, fees incurred in connection with title transfers of the acquired equipment and transition costs related to information technology.

As discussed in Note 2, the electric wireline business was classified as held for sale at December 31, 2010 and was subsequently sold on January 27, 2011. The results of operations of the wireline business from the date of acquisition through December 31, 2010 included revenue of $5.7 million and a pre-tax operating loss of $1.5 million (including a charge of approximately $2.2 million incurred to reduce the carrying value of the disposal group to its net realizable value) which is included in loss from discontinued operations for the year ended December 31, 2010. Results of operations of the acquired pressure pumping business are included in the Company’s consolidated results of operations from the date of acquisition. Revenues of $84.7 million and income from operations of $22.8 million from the acquired pressure pumping business are included in the consolidated statement of operations for the year ended December 31, 2010.

The following represents pro-forma unaudited financial information for the years ended December 31, 2010 and 2009 as if the acquisition had been completed on January 1, 2009 (in thousands, except per share amounts):

	2010		2009
	(Unaudited)
Revenue	$	1,660,635	$	905,168
Income (loss) from continuing operations	$	127,257	$	(46,807	)
Net income (loss)	$	126,301	$	(51,137	)
Basic income (loss) from continuing operations per common share	$	0.83	$	(0.33	)
Basic net income (loss) per common share	$	0.83	$	(0.36	)
Diluted income (loss) from continuing operations per common share	$	0.82	$	(0.33	)
Diluted net income (loss) per common share	$	0.82	$	(0.36	)

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Business Segments

12 Months Ended

Dec. 31, 2011

Business Segments

15. Business Segments

The Company’s revenues, operating profits and identifiable assets are primarily attributable to three business segments: (i) contract drilling of oil and natural gas wells, (ii) pressure pumping services and (iii) the investment, on a non-operating working interest basis, in oil and natural gas properties. Each of these segments represents a distinct type of business. These segments have separate management teams which report to the Company’s chief operating decision maker. The results of operations in these segments are regularly reviewed by the chief operating decision maker for purposes of determining resource allocation and assessing performance. As discussed in Note 2, in January 2010, the Company exited the drilling and completion fluids services business which previously was reported as a business segment. Operating results for that business for the years ended December 31, 2010 and 2009 are presented as discontinued operations in the consolidated statements of operations. Also included in discontinued operations for the year ended December 31, 2011 and 2010 are the operating results for an electric wireline business that was acquired on October 1, 2010 and sold in January 2011.

Contract Drilling — The Company markets its contract drilling services to major and independent oil and natural gas operators. As of December 31, 2011, the Company had 328 marketable land-based drilling rigs, of which 64 were based in west Texas and southeastern New Mexico; 73 in north central and east Texas, northern Louisiana and Mississippi; 48 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota); 62 in south Texas and southern Louisiana; 27 in the Texas panhandle, Oklahoma and Arkansas; 34 in the Appalachian Basin and 20 in western Canada.

For the years ended December 31, 2011, 2010 and 2009, contract drilling revenue earned in Canada was $106 million, $65.7 million and $45.4 million, respectively. Additionally, long-lived assets within the contract drilling segment located in Canada totaled $69.8 million and $70.7 million as of December 31, 2011 and 2010, respectively.

Pressure Pumping — The Company provides pressure pumping services to oil and natural gas operators primarily in Texas and the Appalachian Basin. Pressure pumping services are primarily well stimulation and cementing for the completion of new wells and remedial work on existing wells. Well stimulation involves processes inside a well designed to enhance the flow of oil, natural gas, or other desired substances from the well. Cementing is the process of inserting material between the hole and the pipe to center and stabilize the pipe in the hole.

Oil and Natural Gas — The Company owns and invests in oil and natural gas assets as a non-operating working interest owner. The Company’s oil and natural gas interests are located primarily in Texas and New Mexico.

The following tables summarize selected financial information relating to the Company’s business segments (in thousands):

	Years Ended December 31,
	2011			2010			2009
Revenues:
Contract drilling	$	1,673,629		$	1,085,722		$	600,423
Pressure pumping		845,803			350,608			161,441
Oil and natural gas		50,559			30,425			21,218
Total segment revenues		2,569,991			1,466,755			783,082
Elimination of intercompany revenues(a)		(4,048	)		(3,824	)		(1,136	)
Total revenues	$	2,565,943		$	1,462,931		$	781,946
Income (loss) from continuing operations before income taxes:
Contract drilling	$	346,083		$	140,483		$	(11,219	)
Pressure pumping		193,440			62,194			1,017
Oil and natural gas		23,982			12,455			950
		563,505			215,132			(9,252	)
Corporate and other		(42,903	)		(37,019	)		(35,577	)
Net (loss) gain on asset disposals(b)		4,999			22,812			(3,385	)
Interest income		187			1,674			381
Interest expense		(15,652	)		(12,772	)		(4,148	)
Other		582			927			426
Income (loss) from continuing operations before income taxes	$	510,718		$	190,754		$	(51,555	)
Identifiable assets:
Contract drilling	$	3,252,116		$	2,678,250		$	2,129,567
Pressure pumping		748,643			533,597			213,094
Oil and natural gas		44,990			36,508			25,355
Corporate and other(c)		176,152			174,676			294,136
Total assets	$	4,221,901		$	3,423,031		$	2,662,152
Depreciation, depletion, amortization and impairment:
Contract drilling	$	344,312		$	280,458		$	248,424
Pressure pumping		73,279			40,724			27,589
Oil and natural gas		16,962			10,950			12,927
Corporate and other		2,726			1,361			907
Total depreciation, depletion, amortization and impairment	$	437,279		$	333,493		$	289,847
Capital expenditures:
Contract drilling	$	784,686		$	655,550		$	395,376
Pressure pumping		198,061			51,064			43,144
Oil and natural gas		22,884			23,067			7,341
Corporate and other		5,947			8,409			6,785
Total capital expenditures	$	1,011,578		$	738,090		$	452,646

(a) Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.

(b) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

(c) Corporate and other assets primarily include identifiable assets associated with assets held for sale as well as cash on hand, income taxes receivable and certain deferred federal income tax assets.

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Stock-based Compensation

12 Months Ended

Dec. 31, 2011

Stock-based Compensation

11. Stock-based Compensation

The Company uses share-based payments to compensate employees and non-employee directors. The Company recognizes the cost of share-based payments under the fair-value-based method. Share-based awards consist of equity instruments in the form of stock options, restricted stock or restricted stock units and have included service and, in certain cases, performance conditions. The Company’s share-based awards also include both cash-settled and share-settled performance unit awards. Cash-settled performance unit awards are accounted for as liability awards. Share-settled performance unit awards are accounted for as equity awards. The Company issues shares of common stock when vested stock options are exercised, when restricted stock is granted and when restricted stock units and share-settled performance unit awards vest.

The Company’s shareholders have approved the 2005 Plan, and the Board of Directors adopted a resolution that no future grants would be made under any of the Company’s other previously existing plans. During 2010, the Company amended the 2005 Plan to, among other things, increase the total number of shares authorized for grant from 10,250,000 to 15,250,000. The Company’s share-based compensation plans at December 31, 2011 follow:

Plan Name	Shares Authorized for Grant		Awards Outstanding		Shares Available for Grant
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended		15,250,000		6,293,495		4,399,951
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended (“1997 Plan”)		—		1,983,300		—
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (“2001 Plan”)		—		35,800		—

A summary of the 2005 Plan follows:

• The Compensation Committee of the Board of Directors administers the plan.

• All employees including officers and directors are eligible for awards.

• The Compensation Committee determines the vesting schedule for awards. Awards typically vest over one year for non-employee directors and three years for employees.

• The Compensation Committee sets the term of awards and no option term can exceed 10 years.

• All options granted under the plan are granted with an exercise price equal to or greater than the fair market value of the Company’s common stock at the time the option is granted.

• The plan provides for awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards and dividend equivalents. As of December 31, 2011, non-incentive stock options, restricted stock awards, restricted stock units and performance unit awards had been granted under the plan.

Options granted under the 1997 Plan typically vested over three or five years as dictated by the Compensation Committee. These options have terms of no more than ten years. All options were granted with an exercise price equal to the fair market value of the related common stock at the time of grant. Restricted stock awards granted under the 1997 Plan typically vested over four years.

Options granted under the 2001 Plan typically vested over five years as dictated by the Compensation Committee. These options have terms of no more than ten years. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.

Stock Options — The Company estimates the grant date fair values of stock options using the Black-Scholes-Merton valuation model. Volatility assumptions are based on the historic volatility of the Company’s common stock over the most recent period equal to the expected term of the options as of the date the options are granted. The expected term assumptions are based on the Company’s experience with respect to employee stock option activity. Dividend yield assumptions are based on the expected dividends at the time the options are granted. The risk-free interest rate assumptions are determined by reference to United States Treasury yields. Weighted-average assumptions used to estimate grant date fair values for stock options granted in the years ended December 31, 2011, 2010 and 2009 follow:

	2011			2010			2009
Volatility		45.97	%		45.98	%		49.90	%
Expected term (in years)		5.00			5.00			4.00
Dividend yield		0.67	%		1.35	%		1.67	%
Risk-free interest rate		2.34	%		2.47	%		1.67	%

Stock option activity for the year ended December 31, 2011 follows:

	Shares			Weighted-average exercise price
Outstanding at beginning of year		7,710,102		$	19.58
Granted		419,500		$	30.28
Exercised		(1,048,307	)	$	16.04
Cancelled		—		$	—
Expired		—		$	—
Outstanding at end of year		7,081,295		$	20.73
Exercisable at end of year		6,077,635		$	20.69

Options outstanding at December 31, 2011 have an aggregate intrinsic value of approximately $17.9 million and a weighted-average remaining contractual term of 5.3 years. Options exercisable at December 31, 2011 have an aggregate intrinsic value of approximately $14.6 million and a weighted-average remaining contractual term of 4.8 years. Additional information with respect to options granted, vested and exercised during the years ended December 31, 2011, 2010 and 2009 follows:

	2011		2010		2009
Weighted-average grant date fair value of stock options granted (per share)	$	12.24	$	5.69	$	4.71
Grant date fair value of stock options vested during the year (in thousands)	$	5,639	$	5,553	$	6,973
Aggregate intrinsic value of stock options exercised (in thousands)	$	12,663	$	523	$	510

As of December 31, 2011, options to purchase 1,003,660 shares were outstanding and not vested. All of these non-vested options are expected to ultimately vest. Additional information as of December 31, 2011 with respect to these non-vested options follows:

Aggregate intrinsic value	$3.3 million
Weighted-average remaining contractual term	8.56 years
Weighted-average remaining expected term	3.45 years
Weighted-average remaining vesting period	1.52 years
Unrecognized compensation cost	$6.7 million

Restricted Stock — For all restricted stock awards to date, shares of common stock were issued when the awards were made. Non-vested shares are subject to forfeiture for failure to fulfill service conditions and, in certain cases, performance conditions. Non-forfeitable dividends are paid on non-vested shares of restricted stock. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period.

Restricted stock activity for the year ended December 31, 2011 follows:

	Shares			Weighted- average Grant Date Fair Value
Non-vested restricted stock outstanding at beginning of year		1,114,051		$	16.05
Granted		782,300		$	30.46
Vested		(599,394	)	$	17.60
Forfeited		(83,158	)	$	22.58
Non-vested restricted stock outstanding at end of year		1,213,799		$	24.13

As of December 31, 2011, approximately 1.1 million shares of non-vested restricted stock outstanding are expected to vest. Additional information as of December 31, 2011 with respect to these non-vested shares follows:

Aggregate intrinsic value	$22.6 million
Weighted-average remaining vesting period	1.90 years
Unrecognized compensation cost	$22.6 million

Restricted Stock Units — For all restricted stock unit awards made to date, shares of common stock are not issued until the units vest. Restricted stock units are subject to forfeiture for failure to fulfill service conditions. Non-forfeitable cash dividend equivalents are paid on non-vested restricted stock units.

Restricted stock unit activity for the year ended December 31, 2011 follows:

	Shares			Weighted Average Grant Date Fair Value
Non-vested restricted stock units outstanding at beginning of year		17,834		$	19.73
Granted		10,000		$	30.63
Vested		(10,333	)	$	23.94
Forfeited		—		$	—
Non-vested restricted stock units outstanding at end of year		17,501		$	23.47

Performance Unit Awards. In 2009, the Company granted cash-settled performance unit awards to certain executive officers (the “2009 Performance Units”). The 2009 Performance Units provide for those executive officers to receive a cash payment upon the achievement of certain performance goals established by the Compensation Committee during a specified period. The performance period for the 2009 Performance Units is the period from April 1, 2009 through March 31, 2012, but can extend through March 31, 2014 in certain circumstances. The performance goals for the 2009 Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee of the Board of Directors. These goals are considered to be market conditions under the relevant accounting standards and the market conditions are factored into the determination of the fair value of the performance units. Generally, the recipients will receive a base payment if the Company’s total shareholder return is positive and, when compared to the peer group, is at or above the 25^th percentile but less than the 50^th percentile, two times the base if at or above the 50^th percentile but less than the 75^th percentile, and four times the base if at the 75^th percentile or higher. The total base amount with respect to the 2009 Performance Units is approximately $1.7 million. Because the 2009 Performance Units are to be settled in cash at the end of the performance period, they are accounted for as liability awards and the Company’s pro-rated obligation is measured at estimated fair value at the end of each reporting period using a Monte Carlo simulation model. As of December 31, 2011 this pro-rated obligation was approximately $3.6 million and is included in the caption “accrued expenses” in the liabilities section of the consolidated balance sheet. Compensation expense associated with the 2009 Performance Units was approximately $1.3 million, $1.5 million and $859,000 for the years ended December 31, 2011, 2010 and 2009, respectively.

In 2010 and 2011, the Company granted stock-settled performance unit awards to certain executive officers (the “2010 Performance Units” and the “2011 Performance Units”, respectively). The 2010 Performance Units and the 2011 Performance Units provide for those executive officers to receive a grant of shares of stock upon the achievement of certain performance goals established by the Compensation Committee during a specified period. The performance period for the 2010 Performance Units is the period from April 1, 2010 through March 31, 2013, but can extend through March 31, 2015 in certain circumstances. The performance period for the 2011 Performance Units is the period from April 1, 2011 through March 31, 2014, but can extend through March 31, 2016 in certain circumstances. The performance goals for the 2010 Performance Units and the 2011 Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee of the Board of Directors. These goals are considered to be market conditions under the relevant accounting standards and the market conditions are factored into the determination of the fair value of the respective performance units. Generally, the recipients will receive a base number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 25^th percentile, two times the base if at the 50^th percentile, and four times the base if at the 75^th percentile or higher. The grant of shares when achievement is between the 25^th and 75^th percentile will be determined on a pro-rata basis. The total base number of shares with respect to the 2010 Performance Units is 89,375 shares and the total base number of shares with respect to the 2011 Performance Units is 72,188 shares. Because the 2010 and 2011 Performance Units are stock-settled awards, they are accounted for as equity awards and measured at fair value on the date of grant using a Monte Carlo simulation model. The fair value of the 2010 Performance Units as of the date of grant was approximately $3.1 million and the fair value of the 2011 Performance Units as of the date of grant was approximately $5.6 million. This fair value is recognized on a straight-line basis over the performance period. Compensation expense associated with the 2010 Performance Units was approximately $1.0 million and $779,000 for the years ended December 31, 2011 and 2010, respectively. Compensation expense associated with the 2011 Performance Units was approximately $1.4 million for the year ended December 31, 2011.

Dividends on Equity Awards — Non-forfeitable cash dividends and dividend equivalents paid on equity awards are recognized as follows:

• Dividends are recognized as reductions of retained earnings for the portion of restricted stock awards expected to vest.

• Dividends are recognized as additional compensation cost for the portion of restricted stock awards that are not expected to vest or that ultimately do not vest.

• Dividend equivalents are recognized as additional compensation cost for restricted stock units.

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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 525,601		$ 200,925		$ (48,214)
Net (loss) gain on asset disposals	4,999	[1]	22,812	[1]	(3,385)	[1]
Interest income	187		1,674		381
Interest expense	(15,652)		(12,772)		(4,148)
Other	582		927		426
Income (loss) from continuing operations before income taxes	510,718		190,754		(51,555)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	563,505		215,132		(9,252)
Operating Segments | Contract Drilling
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	346,083		140,483		(11,219)
Operating Segments | Pressure Pumping
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	193,440		62,194		1,017
Operating Segments | Oil and Natural Gas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	23,982		12,455		950
Corporate and other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ (42,903)		$ (37,019)		$ (35,577)

[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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Asset Retirement Obligation

12 Months Ended

Dec. 31, 2011

Asset Retirement Obligation

7. Asset Retirement Obligation

The Company records a liability for the estimated costs to be incurred in connection with the abandonment of oil and natural gas properties in the future. This liability is included in the caption “other” in the liabilities section of the consolidated balance sheet. The following table describes the changes to the Company’s asset retirement obligations during 2011 and 2010 (in thousands):

	2011			2010
Balance at beginning of year	$	3,063		$	2,955
Liabilities incurred		361			335
Liabilities settled		(110	)		(339	)
Accretion expense		143			112
Revision in estimated costs of plugging oil and natural gas wells		(2	)		—
Asset retirement obligation at end of year	$	3,455		$	3,063

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Accrued Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]
Deferred revenue recognized	$ 8.4	$ 6.1

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Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill and Intangible Assets

5. Goodwill and Intangible Assets

Goodwill — Goodwill by operating segment as of December 31, 2011 and 2010 and changes for the years then ended are as follows (in thousands):

	Contract Drilling		Pressure Pumping		Total
Balance December 31, 2009	$	86,234	$	—	$	86,234
Acquisition		—		67,575		67,575
Balance December 31, 2010		86,234		67,575		153,809
Changes to goodwill		—		—		—
Balance December 31, 2011	$	86,234	$	67,575	$	153,809

Goodwill was recorded in connection with a business combination in 2010 as a result of the Company’s acquisition of the pressure pumping business of Key Energy Services, Inc. on October 1, 2010, as discussed further in Note 3. Approximately $53.2 million of this goodwill is expected to be deductible for tax purposes. There were no accumulated impairment losses as of December 31, 2011 or 2010.

Goodwill is evaluated at least annually on December 31 to determine if the fair value of recorded goodwill has decreased below its carrying value. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. The Company’s reporting units for impairment testing have been determined to be its operating segments. Goodwill impairment is measured using a two-step impairment test. The first step is to compare the fair value of an entity’s reporting units to the respective carrying value of those reporting units. If the carrying value of a reporting unit exceeds its fair value the second step of the impairment test is performed whereby the fair value of the reporting unit is allocated to its identifiable tangible and intangible assets and liabilities with any remaining fair value representing the fair value of goodwill.

In connection with the Company’s annual goodwill impairment assessment as of December 31, 2010, the Company estimated its enterprise value based on the market capitalization of the Company as determined by reference to the closing price of the Company’s common stock during the fifteen days before and after year end. This enterprise value was allocated to the Company’s reporting units and it was determined that the fair values of the Company’s reporting units were in excess of their carrying value. As a result, the Company concluded that no impairment of goodwill was indicated as of December 31, 2010.

In September 2011, the FASB issued an accounting standards update which provides entities with the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test described above is unnecessary. The provisions of this accounting standards update are effective for goodwill impairment tests performed for fiscal years beginning after December 15, 2011, however, early adoption is permitted. The Company elected to adopt the provisions of the new goodwill impairment accounting standard issued in September 2011 in connection with its annual impairment assessment of goodwill as of December 31, 2011 and determined based on an assessment of qualitative factors that it was more likely than not that the fair values of the Company’s reporting units were greater than their carrying amounts and further testing was not necessary.

In making this determination, the Company considered the continued demand experienced during 2011 for its services in the contract drilling and pressure pumping businesses. The Company also considered the level of commodity prices for crude oil and natural gas, which influence its overall level of business activity in these operating segments. Additionally, current year operating results and forecasted operating results for the coming year were also taken into account. The Company’s overall market capitalization and the large amount of calculated excess of the fair values of the Company’s reporting units over their carrying values and lack of significant changes in the key assumptions from its 2010 quantitative Step 1 assessment of goodwill were also considered. The Company has undertaken extensive efforts in the past several years to upgrade its fleet of equipment and believes that it is positioned well from a competitive standpoint to satisfy demand for high technology drilling of unconventional horizontal wells which should help mitigate decreases in demand for drilling conventional vertical wells that may result from recent decreases in natural gas prices. In the event that market conditions weaken, the Company may be required to record an impairment of goodwill in its contract drilling or pressure pumping reporting units in the future, and such impairment could be material.

Intangible Assets — Intangible assets were recorded in the pressure pumping operating segment in connection with the fourth quarter 2010 acquisition of the assets of the pressure pumping business discussed in Note 3. As a result of the purchase price allocation, the Company recorded intangible assets related to a non-compete agreement and the customer relationships acquired. These intangible assets were recorded at fair value on the date of acquisition.

The non-compete agreement has a term of three years from October 1, 2010. The value of this agreement was estimated using a with and without scenario where cash flows were projected through the term of the agreement assuming the agreement is in place and compared to cash flows assuming the non-compete agreement was not in place. The intangible asset associated with the non-compete agreement is being amortized on a straight-line basis over the three-year term of the agreement. Amortization expense of $467,000 and $116,000 was recorded in the year ended December 31, 2011 and 2010, respectively, associated with the non-compete agreement.

The value of the customer relationships was estimated using a multi-period excess earnings model to determine the present value of the projected cash flows associated with the customers in place at the time of the acquisition and taking into account a contributory asset charge. The resulting intangible asset is being amortized on a straight-line basis over seven years. Amortization expense of $3.6 million and $910,000 was recorded in the year ended December 31, 2011 and 2010, respectively, associated with customer relationships.

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2011 and 2010 (in thousands):

	2011							2010
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Non-compete agreement	$	1,400	$	(583	)	$	817	$	1,400	$	(116	)	$	1,284
Customer relationships		25,500		(4,553	)		20,947		25,500		(910	)		24,590
Total intangible assets	$	26,900	$	(5,136	)	$	21,764	$	26,900	$	(1,026	)	$	25,874

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Accrued Expenses

12 Months Ended

Dec. 31, 2011

Accrued Expenses

6. Accrued Expenses

Accrued expenses consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011		2010
Salaries, wages, payroll taxes and benefits	$	58,692	$	39,866
Workers’ compensation liability		66,121		63,011
Property, sales, use and other taxes		11,850		6,682
Insurance, other than workers’ compensation		6,012		12,648
Accrued interest payable		4,937		4,879
Deferred revenue — current		7,229		10,220
2009 Performance Unit Awards		3,640		—
Other		6,148		10,009
	$	164,629	$	147,315

Deferred revenue was recorded in 2010 in the purchase price allocation associated with the Company’s acquisition of a pressure pumping business as discussed in Note 3. The deferred revenue relates to out-of-market pricing agreements that were in place at the acquired business at the time of the acquisition. The deferred revenue will be recognized as pressure pumping revenue over the remaining term of the pricing agreements. Deferred revenue of approximately $8.4 million and $6.1 million was recognized in the years ended December 31, 2011 and 2010, respectively, related to these pricing agreements.

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Long Term Debt

12 Months Ended

Dec. 31, 2011

Long Term Debt

8. Long Term Debt

Credit Facilities — In March 2009, the Company entered into an unsecured revolving credit facility (the “2009 Credit Facility”) with a maximum borrowing capacity of $240 million. The Company incurred debt issuance costs of approximately $6.2 million during 2009 in connection with the 2009 Credit Facility. These costs were being amortized to interest expense over the contractual term of the 2009 Credit Facility.

On July 2, 2010, the Company entered into a 364-Day Credit Agreement (the “364-Day Credit Agreement”) with Wells Fargo Bank, N.A., as administrative agent and lender. The 364-Day Credit Agreement was a committed senior unsecured single draw term loan credit facility that permitted a borrowing of up to $250 million, provided that the loan must have been drawn no later than September 30, 2010 or, if an additional fee was paid, October 30, 2010. The maturity date under the 364-Day Credit Agreement was 364 days after the date on which the closing conditions under the 364-Day Credit Agreement were met. This facility was not drawn as of September 30, 2010 and it expired at that time.

On August 19, 2010, the Company entered into a Credit Agreement (the “Credit Agreement”) with Wells Fargo Bank, N.A., as administrative agent, letter of credit issuer, swing line lender and lender, and each of the other letter of credit issuer and lender parties thereto. The Credit Agreement is a committed senior unsecured credit facility that includes a revolving credit facility and a term loan facility. The Credit Agreement replaced the 2009 Credit Facility.

The revolving credit facility permits aggregate borrowings of up to $400 million and contains a letter of credit facility that is limited to $150 million and a swing line facility that is limited to $40 million. Subject to customary conditions, the Company may request that the lenders’ aggregate commitments with respect to the revolving credit facility be increased by up to $100 million, not to exceed total commitments of $500 million. The maturity date for the revolving facility is August 19, 2013.

The term loan facility provided for a loan of $100 million which was funded on August 19, 2010. The term loan facility is payable in quarterly principal installments commencing November 19, 2010. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments and 5.00% of the original principal amount for the next subsequent three quarterly installments, with the remainder becoming due at maturity. The maturity date for the term loan facility is August 19, 2014.

Loans under the Credit Agreement bear interest by reference, at the Company’s election, to the LIBOR rate or base rate. The applicable margin on LIBOR rate loans varies from 2.75% to 3.75% and the applicable margin on base rate loans varies from 1.75% to 2.75%, in each case determined based upon the Company’s debt to capitalization ratio. As of December 31, 2011, the applicable margin on LIBOR rate loans was 2.75% and the applicable margin on base rate loans was 1.75%. A letter of credit fee is payable by the Company equal to the applicable margin for LIBOR rate loans times the daily amount available to be drawn under outstanding letters of credit. The commitment fee payable to the lenders for the unused portion of the revolving credit facility varies from 0.50% to 0.75% based upon the Company’s debt to capitalization ratio and was 0.50% as of December 31, 2011.

Each domestic subsidiary of the Company other than any immaterial subsidiary has unconditionally guaranteed all existing and future indebtedness and liabilities of the Company and the other guarantors arising under the Credit Agreement and other loan documents. Such guarantees also cover obligations of the Company and any subsidiary of the Company arising under any interest rate swap contract with any person while such person is a lender or affiliate of a lender under the Credit Agreement.

The Credit Agreement contains customary representations, warranties, indemnities and affirmative and negative covenants. The Credit Agreement also requires compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 45% at any time. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period.

As of December 31, 2011, the Company had $92.5 million principal amount outstanding under the term loan facility at an interest rate of 3.25% and $110 million principal amount outstanding under the revolving credit facility at a weighted average interest rate of 4.05%. The carrying value of the balances outstanding under the term loan facility and the revolving credit facility approximate fair value due to the frequency at which the interest rate resets. The Company had $40.6 million in letters of credit outstanding at December 31, 2011 and, as a result, had available borrowing capacity of approximately $249 million at that date.

Senior Notes — On October 5, 2010, the Company completed the issuance and sale of $300 million in aggregate principal amount of its 4.97% Series A Senior Notes due October 5, 2020 (the “Notes”) in a private placement. A portion of the proceeds from the Notes was used to repay a $200 million borrowing on the Company’s revolving credit facility, which had been drawn to fund a portion of the acquisition that closed on October 1, 2010 as discussed in Note 3. The fair value of the Notes at December 31, 2011 was approximately $316 million based on discounted cash flows associated with the Notes using current market rates of interest. The Notes are senior unsecured obligations of the Company which rank equally in right of payment with all other unsubordinated indebtedness of the Company. The Notes are guaranteed on a senior unsecured basis by each of the existing domestic subsidiaries of the Company other than immaterial subsidiaries.

The Notes bear interest at a rate of 4.97% per annum. The Company will pay interest on the Notes on April 5 and October 5 of each year. The Notes will mature on October 5, 2020. The Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the Notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreement. The Company must offer to prepay the Notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the Notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid Note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.

The note purchase agreement requires compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio for the four prior quarters of EBITDA to interest charges for that same period.

Events of default under the note purchase agreement and the Credit Agreement include failure to pay principal or interest when due, failure to comply with the financial and operational covenants, a cross default event, a judgment in excess of a threshold event, the guaranty agreement ceasing to be enforceable, the occurrence of certain ERISA events, a change of control event and bankruptcy and other insolvency events. If an event of default under the note purchase agreement occurs and is continuing, then holders of a majority in principal amount of the Notes have the right to declare all the Notes then-outstanding to be immediately due and payable. In addition, if the Company defaults in payments on any Note, then until such defaults are cured, the holder thereof may declare all the Notes held by it to be immediately due and payable.

The Company incurred approximately $10.8 million in debt issuance costs during 2010 in connection with the Credit Agreement and the Senior Notes discussed above. These costs were deferred and will be recognized as interest expense over the term of the underlying debt. Interest expense related to the amortization of debt issuance costs for the Credit Agreement and the Senior Notes was approximately $2.4 million and $1.1 million for the years ended December 31, 2011 and 2010, respectively.

Presented below is a schedule of the principal repayment requirements of long-term debt by fiscal year as of December 31, 2011 (in thousands):

Year ending December 31,
2012	$	10,000
2013		122,500
2014		70,000
2015		—
2016		—
Thereafter		300,000
Total	$	502,500

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Commitments, Contingencies and Other Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
Letters of credit, collateral for retrospective premiums and retained losses	$ 40.6
Commitments to purchase major equipment	352
Current obligation	42.5
Obligation for next year	13.5
Self-insured retention	2.0
Workers' compensation and automobile liability insurance coverage, deductible per occurrence	1.0
Non Revolving Senior Secured Term Loan
Commitments and Contingencies Disclosure [Line Items]
Advance to non-affiliates	12.0
Notes receivable interest rate	5.00%
Notes receivable	$ 2.9

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Business Segments - Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 4,221,901		$ 3,423,031		$ 2,662,152
Operating Segments | Contract Drilling
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,252,116		2,678,250		2,129,567
Operating Segments | Pressure Pumping
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	748,643		533,597		213,094
Operating Segments | Oil and Natural Gas
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	44,990		36,508		25,355
Corporate and other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 176,152	[1]	$ 174,676	[1]	$ 294,136	[1]

[1] Corporate and other assets primarily include identifiable assets associated with assets held for sale as well as cash on hand, income taxes receivable and certain deferred federal income tax assets.

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Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended						1 Months Ended
	Aug. 01, 2007	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Employees	Dec. 31, 2010 Employees	Dec. 31, 2009 Employees	Feb. 01, 2012 Dividend Declared
Stockholders Equity Note [Line Items]
Dividend declaration date								Feb. 01, 2012
Dividend per share, declared								$ 0.05
Dividend payment date								Mar. 30, 2012
Dividend record date								Mar. 15, 2012
Amount approved for repurchases under stock buyback program	$ 250,000,000
Treasury stock shares acquired		8,689	8,743	5,715
Treasury stock repurchased, value		255,000	123,000	79,000
Amount authorized to purchase the Company's outstanding common stock under the program		113,000,000
Treasury stock shares acquired					135,068	117,083	114,983
Purchase price for treasury stock acquired		$ 4,314,000	$ 1,853,000	$ 1,623,000	$ 4,100,000	$ 1,700,000	$ 1,500,000

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Schedule of the Principal Repayment Requirements of Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Long Term Debt Maturities Repayments Of Principal [Line Items]
2012	$ 10,000
2013	122,500
2014	70,000
2015
2016
Thereafter	300,000
Total	$ 502,500

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Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Information [Line Items]
Operating revenues	$ 2,565,943	$ 1,462,931	$ 781,946
Operating income	525,601	200,925	(48,214)
Income from continuing operations, net of income taxes	322,780	117,898	(33,960)
Loss from discontinued operations, net of income taxes	(367)	(956)	(4,330)
Net income	322,413	116,942	(38,290)
Basic income (loss) per common share:
From continuing operations	$ 2.08	$ 0.77	$ (0.22)
From discontinued operations	$ 0.00	$ (0.01)	$ (0.03)
Net income	$ 2.08	$ 0.76	$ (0.25)
Diluted income (loss) per common share:
From continuing operations	$ 2.06	$ 0.76	$ (0.22)
From discontinued operations	$ 0.00	$ (0.01)	$ (0.03)
Net income	$ 2.06	$ 0.76	$ (0.25)
First Quarter
Quarterly Financial Information [Line Items]
Operating revenues	567,404	271,598
Operating income	117,547	7,831
Income from continuing operations, net of income taxes	71,619	4,186
Loss from discontinued operations, net of income taxes	(367)
Net income	71,252	4,186
Basic income (loss) per common share:
From continuing operations	$ 0.46	$ 0.03
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.46	$ 0.03
Diluted income (loss) per common share:
From continuing operations	$ 0.46	$ 0.03
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.46	$ 0.03
Second Quarter
Quarterly Financial Information [Line Items]
Operating revenues	600,064	306,992
Operating income	131,860	45,757
Income from continuing operations, net of income taxes	81,638	29,528
Net income	81,638	29,528
Basic income (loss) per common share:
From continuing operations	$ 0.53	$ 0.19
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.53	$ 0.19
Diluted income (loss) per common share:
From continuing operations	$ 0.52	$ 0.19
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.52	$ 0.19
Third Quarter
Quarterly Financial Information [Line Items]
Operating revenues	673,828	378,663
Operating income	132,294	52,509
Income from continuing operations, net of income taxes	81,928	29,374
Net income	81,928	29,374
Basic income (loss) per common share:
From continuing operations	$ 0.53	$ 0.19
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.53	$ 0.19
Diluted income (loss) per common share:
From continuing operations	$ 0.53	$ 0.19
From discontinued operations	$ 0.00	$ 0.00
Net income	$ 0.53	$ 0.19
Fourth Quarter
Quarterly Financial Information [Line Items]
Operating revenues	724,647	505,678
Operating income	143,900	94,828
Income from continuing operations, net of income taxes	87,595	54,810
Loss from discontinued operations, net of income taxes		(956)
Net income	$ 87,595	$ 53,854
Basic income (loss) per common share:
From continuing operations	$ 0.56	$ 0.36
From discontinued operations	$ 0.00	$ (0.01)
Net income	$ 0.56	$ 0.35
Diluted income (loss) per common share:
From continuing operations	$ 0.56	$ 0.35
From discontinued operations	$ 0.00	$ (0.01)
Net income	$ 0.56	$ 0.35

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Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Expenses

Accrued expenses consisted of the following at December 31, 2011 and 2010 (in thousands):

	2011		2010
Salaries, wages, payroll taxes and benefits	$	58,692	$	39,866
Workers’ compensation liability		66,121		63,011
Property, sales, use and other taxes		11,850		6,682
Insurance, other than workers’ compensation		6,012		12,648
Accrued interest payable		4,937		4,879
Deferred revenue — current		7,229		10,220
2009 Performance Unit Awards		3,640		—
Other		6,148		10,009
	$	164,629	$	147,315

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Summary of Purchase Price Allocation (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2010
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Sand and chemical inventory	$ 6,848
Supplies	312
Property and equipment	154,359
Deferred tax asset	8,514
Goodwill	67,575
Below-market pricing agreements	(23,200)
Total purchase price	241,308
Non-compete agreement
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	1,400
Customer relationships
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	$ 25,500

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Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes

13. Income Taxes

Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2011, 2010 and 2009 are as follows (in thousands):

	2011			2010			2009
Federal income tax expense (benefit):
Current	$	16,336		$	(77,310	)	$	(117,493	)
Deferred		146,842			145,198			103,574
		163,178			67,888			(13,919	)
State income tax expense (benefit):
Current		6,056			19			(1,883	)
Deferred		13,196			3,246			(1,875	)
		19,252			3,265			(3,758	)
Foreign income tax expense (benefit):
Current		6,579			2,657			338
Deferred		(1,071	)		(954	)		(256	)
		5,508			1,703			82
Total income tax expense (benefit):
Current		28,971			(74,634	)		(119,038	)
Deferred		158,967			147,490			101,443
Total income tax expense (benefit)	$	187,938		$	72,856		$	(17,595	)

The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2011, 2010 and 2009 is summarized as follows:

	2011			2010			2009
Statutory tax rate		35.0	%		35.0	%		35.0	%
State income taxes		2.5			1.1			4.7
Permanent differences		(0.1	)		2.3			(5.7	)
Other, net		(0.6	)		(0.2	)		0.1
Effective tax rate		36.8	%		38.2	%		34.1	%

The Domestic Production Activities Deduction was enacted as part of the American Jobs Creation Act of 2004 (as revised by the Emergency Economic Stabilization Act of 2008,) and allows a deduction of 6% in 2009 and 9% in 2010 and thereafter on the lesser of qualified production activities income or taxable income. The permanent differences for 2010 and 2009 reflect the recapture of a portion of this deduction due to the carryback of the 2010 and 2009 net operating losses to prior years. This recapture resulted in a negative effective rate impact in 2009 due to the Company having a loss before income taxes in that year. The permanent difference for 2011 does not include any deduction as it is limited to taxable income and the Company had a tax loss in 2011.

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):

	December 31, 2011			Net Change			December 31, 2010			Net Change			December 31, 2009			Net Change			December 31, 2008
Deferred tax assets:
Current:
Net operating loss carryforwards	$	114,576		$	114,576		$	—		$	—		$	—		$	—		$	—
Workers’ compensation allowance		24,004			714			23,290			(1,334	)		24,624			(1,360	)		25,984
Other		18,800			146			18,654			(962	)		19,616			(2,735	)		22,351
		157,380			115,436			41,944			(2,296	)		44,240			(4,095	)		48,335
Non-current:
Net operating loss carryforwards		18,434			11,969			6,465			1,593			4,872			4,872			—
Expense associated with employee stock options		12,728			1,476			11,252			2,123			9,129			2,500			6,629
Federal benefit of foreign deferred tax liabilities		—			—			—			(9,160	)		9,160			(256	)		9,416
Federal benefit of state deferred tax liabilities		20,260			7,105			13,155			3,383			9,772			2,702			7,070
Other		10,670			(5,361	)		16,031			6,546			9,485			4,120			5,365
		62,092			15,189			46,903			4,485			42,418			13,938			28,480
Total deferred tax assets		219,472			130,625			88,847			2,189			86,658			9,843			76,815
Deferred tax liabilities:
Current:
Other		(14,655	)		474			(15,129	)		(3,766	)		(11,363	)		1,044			(12,407	)
Non-current:
Property and equipment basis difference		(835,823	)		(289,168	)		(546,655	)		(133,542	)		(413,113	)		(110,786	)		(302,327	)
Other		(12,901	)		(1,231	)		(11,670	)		(709	)		(10,961	)		(7,091	)		(3,870	)
		(848,724	)		(290,399	)		(558,325	)		(134,251	)		(424,074	)		(117,877	)		(306,197	)
Total deferred tax liabilities		(863,379	)		(289,925	)		(573,454	)		(138,017	)		(435,437	)		(116,833	)		(318,604	)
Net deferred tax liability	$	(643,907	)	$	(159,300	)	$	(484,607	)	$	(135,828	)	$	(348,779	)	$	(106,990	)	$	(241,789	)

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. The Company expects the deferred tax assets at December 31, 2011 and 2010 to be realized as a result of the reversal of existing taxable temporary differences giving rise to deferred tax liabilities and the generation of taxable income; therefore, no valuation allowance is considered necessary.

Other deferred tax assets consist primarily of the tax effect of various allowance accounts and tax-deferred expenses expected to generate future tax benefits of approximately $29.5 million. Other deferred tax liabilities consist primarily of the tax effect of receivables from insurance companies and tax-deferred income not yet recognized for tax purposes.

For income tax purposes, the Company generated approximately $327 million of federal net operating losses and approximately $136 million of state net operating losses during the year ended December 31, 2011. Of these amounts, approximately $11.1 million will be carried back to prior years, and the remaining balance can be carried forward to future years along with prior year carryovers in the amount of $118 million. Net operating losses that can be carried forward, if unused, are scheduled to expire as follows: 2014 — $9.6 million; 2015 — $12.9 million; 2016 — $8.2 million; 2018 — $2.4 million; 2028 — $15.3 million; 2029 — $59.8 million; 2030 — $35.7 million and 2031 — $426 million.

As of December 31, 2011, the Company had no unrecognized tax benefits. The Company has established a policy to account for interest and penalties related to uncertain income tax positions as operating expenses. As of December 31, 2011, the tax years ended December 31, 2008 through December 31, 2010 are open for examination by U.S. taxing authorities. As of December 31, 2011, the tax years ended December 31, 2007 through December 31, 2010 are open for examination by Canadian taxing authorities.

On January 1, 2010, the Company converted its Canadian operations from a Canadian branch to a controlled foreign corporation for federal income tax purposes. Because the statutory tax rates in Canada are lower than those in the United States, this transaction triggered a $5.1 million reduction in deferred tax liabilities, which is being amortized as a reduction to deferred income tax expense over the weighted average remaining useful life of the Canadian assets.

As a result of the above conversion, the Company’s Canadian assets are no longer directly subject to United States taxation, provided that the related unremitted earnings are permanently reinvested in Canada. Effective January 1, 2010, the Company has elected to permanently reinvest these unremitted earnings in Canada, and intends to do so for the foreseeable future. As a result, no deferred United States federal or state income taxes have been provided on such unremitted foreign earnings, which totaled approximately $25.2 million as of December 31, 2011.

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Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

18. Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2010
Operating revenues	$	271,598		$	306,992	$	378,663	$	505,678
Operating income		7,831			45,757		52,509		94,828
Income from continuing operations, net of income taxes		4,186			29,528		29,374		54,810
Loss from discontinued operations, net of income taxes		—			—		—		(956	)
Net income		4,186			29,528		29,374		53,854
Basic income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.36
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
Diluted income (loss) per common share:
From continuing operations	$	0.03		$	0.19	$	0.19	$	0.35
From discontinued operations	$	0.00		$	0.00	$	0.00	$	(0.01	)
Net income	$	0.03		$	0.19	$	0.19	$	0.35
2011
Operating revenues	$	567,404		$	600,064	$	673,828	$	724,647
Operating income		117,547			131,860		132,294		143,900
Income from continuing operations, net of income taxes		71,619			81,638		81,928		87,595
Loss from discontinued operations, net of income taxes		(367	)		—		—		—
Net income		71,252			81,638		81,928		87,595
Basic income (loss) per common share:
From continuing operations	$	0.46		$	0.53	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.53	$	0.53	$	0.56
Diluted income (loss) per common share:
From continuing operations	$	0.46		$	0.52	$	0.53	$	0.56
From discontinued operations	$	0.00		$	0.00	$	0.00	$	0.00
Net income	$	0.46		$	0.52	$	0.53	$	0.56

As discussed in Note 2, the Company exited the drilling and completion fluids services business in January 2010 and sold a recently acquired wireline business in January 2011. The results of operations related to those businesses have been reclassified and presented as discontinued operations in the quarterly financial information above.

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Components of Assets Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2010
Assets held for sale:
Inventory	$ 756
Property and equipment, net	24,769
Reserve to reduce disposal group to fair value less costs to sell	(2,155)
Total assets held for sale	$ 23,370

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Concentrations of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2011

Company's Demand Deposits and Temporary Cash Investments

At December 31, 2011 and 2010, the Company’s demand deposits and temporary cash investments consisted of the following (in thousands):

	2011			2010
Deposits in FDIC and SIPC-insured institutions under insurance limits	$	289		$	1,523
Deposits in FDIC and SIPC-insured institutions over insurance limits		50,035			51,625
Deposits in foreign banks		18,823			11,533
		69,147			64,681
Less outstanding checks and other reconciling items		(45,201	)		(37,069	)
Cash and cash equivalents	$	23,946		$	27,612

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2008	$ 2,126,942	$ 1,801	$ 765,512	$ 1,970,824	$ 5,774	$ (616,969)
Beginning Balance (in shares) at Dec. 31, 2008		180,192,000
Comprehensive income (loss):
Net income (loss)	(38,290)			(38,290)
Foreign currency translation adjustment, (net of tax of $2,814 in 2010 and $5,347 in 2009 )	9,222				9,222
Total comprehensive income	(29,068)			(38,290)	9,222
Issuance of restricted stock (in shares)		604,000
Issuance of restricted stock		6	(6)
Vesting of restricted stock units		6,000
Forfeitures of restricted stock (in shares)		(56,000)
Exercise of stock options (in shares)		83,000
Exercise of stock options	569	1	568
Stock-based compensation	18,565		18,565
Tax expense/benefit related to stock-based compensation	(3,004)		(3,004)
Payment of cash dividends	(30,681)			(30,681)
Purchase of treasury stock	(1,623)					(1,623)
Ending Balance at Dec. 31, 2009	2,081,700	1,808	781,635	1,901,853	14,996	(618,592)
Ending Balance (in shares) at Dec. 31, 2009		180,829,000
Comprehensive income (loss):
Net income (loss)	116,942			116,942
Foreign currency translation adjustment, (net of tax of $2,814 in 2010 and $5,347 in 2009 )	6,601				6,601
Total comprehensive income	123,543			116,942	6,601
Issuance of restricted stock (in shares)		700,000
Issuance of restricted stock		7	(7)
Vesting of restricted stock units		7,000
Forfeitures of restricted stock (in shares)		(59,000)
Forfeitures of restricted stock		(1)	1
Exercise of stock options (in shares)		61,000
Exercise of stock options	525	1	524
Stock-based compensation	16,779		16,779
Tax expense/benefit related to stock-based compensation	(2,291)		(2,291)
Payment of cash dividends	(30,796)			(30,796)
Purchase of treasury stock	(1,853)					(1,853)
Ending Balance at Dec. 31, 2010	2,187,607	1,815	796,641	1,987,999	21,597	(620,445)
Ending Balance (in shares) at Dec. 31, 2010	181,537,568	181,538,000
Comprehensive income (loss):
Net income (loss)	322,413			322,413
Foreign currency translation adjustment, (net of tax of $2,814 in 2010 and $5,347 in 2009 )	(2,138)				(2,138)
Total comprehensive income	320,275			322,413	(2,138)
Issuance of restricted stock (in shares)		782,000
Issuance of restricted stock		8	(8)
Vesting of restricted stock units		10,000
Forfeitures of restricted stock (in shares)		(83,000)
Forfeitures of restricted stock		(1)	1
Exercise of stock options (in shares)	1,048,307	1,048,000
Exercise of stock options	16,811	11	16,800
Stock-based compensation	20,904		20,904
Tax expense/benefit related to stock-based compensation	6,393		6,393
Payment of cash dividends	(31,045)			(31,045)
Purchase of treasury stock	(4,314)					(4,314)
Ending Balance at Dec. 31, 2011	$ 2,516,631	$ 1,833	$ 840,731	$ 2,279,367	$ 19,459	$ (624,759)
Ending Balance (in shares) at Dec. 31, 2011	183,295,350	183,295,000

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Company's Demand Deposits and Temporary Cash Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Concentration Risk [Line Items]
Deposits in FDIC and SIPC-insured institutions under insurance limits	$ 289	$ 1,523
Deposits in FDIC and SIPC-insured institutions over insurance limits	50,035	51,625
Deposits in foreign banks	18,823	11,533
Total Cash and cash equivalents., Total	69,147	64,681
Less outstanding checks and other reconciling items	(45,201)	(37,069)
Cash and cash equivalents	$ 23,946	$ 27,612	$ 49,877	$ 81,223

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Discontinued Operations

12 Months Ended

Dec. 31, 2011

Discontinued Operations

2. Discontinued Operations

On January 20, 2010, the Company exited the drilling and completion fluids business, which had previously been presented as one of the Company’s reportable operating segments. On that date, the Company’s wholly owned subsidiary, Ambar Lone Star Fluid Services LLC, completed the sale of substantially all of its assets, excluding billed accounts receivable. The sales price was approximately $42.6 million. Upon the Company’s exit from the drilling and completion fluids business, the Company classified its drilling and completion fluids operating segment as a discontinued operation and an impairment loss was recognized in 2009 to reduce the carrying value of the assets to be disposed of to fair value less estimated costs to sell and no significant gain or loss was recognized in connection with the sale in 2010. The results of operations of this business have been reclassified and presented as results of discontinued operations for all periods presented in these consolidated financial statements.

On January 27, 2011, the stock of the Company’s electric wireline subsidiary, Universal Wireline, Inc., was sold in a cash transaction for $25.5 million. Except for inventory, the working capital of Universal Wireline, Inc. was excluded from the sale and retained by a subsidiary of the Company. Universal Wireline, Inc. was formed in 2010 to acquire the electric wireline business of Key Energy Services, Inc., as discussed in Note 3. The results of operations of this business have been presented as results of discontinued operations in these consolidated financial statements. As of December 31, 2010, the assets to be disposed of were classified as held for sale and are presented separately within current assets under the caption “Assets held for sale” in the consolidated balance sheet. Upon being classified as held for sale, the assets to be disposed of were recorded at fair value less estimated costs to sell resulting in a charge of $2.2 million. Due to the fact that the carrying value of the assets had been adjusted to net realizable value, no significant additional gain or loss was recognized in connection with the sale.

Summarized operating results from discontinued operations for the years ended December 31, 2011, 2010 and 2009 are shown below (in thousands):

	2011			2010			2009
Drilling and completion fluids revenues	$	—		$	3,737		$	79,786
Electric wireline revenues		1,104			5,712			—
Operating revenues from discontinued operations	$	1,104		$	9,449		$	79,786
Loss from discontinued operations before income taxes	$	(576	)	$	(1,499	)	$	(6,538	)
Income tax benefit		209			543			2,208
Loss from discontinued operations	$	(367	)	$	(956	)	$	(4,330	)

The components of assets held for sale at December 31, 2010 are shown below (in thousands):

Assets held for sale:
Inventory	$	756
Property and equipment, net		24,769
Reserve to reduce disposal group to fair value less costs to sell		(2,155	)
Total assets held for sale	$	23,370

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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 26,900	$ 26,900
Accumulated Amortization	(5,136)	(1,026)
Net Carrying Amount	21,764	25,874
Non-compete agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400	1,400
Accumulated Amortization	(583)	(116)
Net Carrying Amount	817	1,284
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,500	25,500
Accumulated Amortization	(4,553)	(910)
Net Carrying Amount	$ 20,947	$ 24,590

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Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Disclosure [Line Items]
Number of reportable business segments	3
Marketable land-based drilling rigs	328
Long-lived assets	$ 3,167,266	$ 2,620,900
West Texas and southeastern New Mexico
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	64
North central and east Texas, northern Louisiana and Mississippi
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	73
Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota)
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	48
South Texas and southern Louisiana
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	62
Texas panhandle, Oklahoma and Arkansas
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	27
Appalachian Basin
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	34
Western Canada
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	20
Canada | Contract Drilling
Segment Reporting Disclosure [Line Items]
Oil and gas services	106,000	65,700	45,400
Long-lived assets	$ 69,800	$ 70,700

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Weighted-Average Assumptions Used to Estimate the Grant Date Fair Values for Stock Options Granted (Detail) (Stock Options)	12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010 Year	Dec. 31, 2009 Year
Stock Options
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Volatility	45.97%	45.98%	49.90%
Expected term (in years)	5.00	5.00	4.00
Dividend yield	0.67%	1.35%	1.67%
Risk-free interest rate	2.34%	2.47%	1.67%

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VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2011

VALUATION AND QUALIFYING ACCOUNTS

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

Description	Beginning Balance		Charged to Costs and Expenses			Deductions(1)		Ending Balance
	(In thousands)
Year Ended December 31, 2011
Deducted from asset accounts:
Allowance for doubtful accounts	$	5,114	$	0		$	227	$	4,887
Year Ended December 31, 2010
Deducted from asset accounts:
Allowance for doubtful accounts	$	10,911	$	(2,000	)	$	3,797	$	5,114
Year Ended December 31, 2009
Deducted from asset accounts:
Allowance for doubtful accounts	$	9,330	$	4,700		$	3,119	$	10,911

(1) Consists of uncollectible accounts written off.

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Additional Information on Non-vested Restricted Stock (Detail) (Restricted Stock Awards, USD $) In Millions, unless otherwise specified	Dec. 31, 2011 Year
Restricted Stock Awards
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Aggregate intrinsic value	$ 22.6
Weighted-average remaining vesting period	1.90
Unrecognized compensation cost	$ 22.6

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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Company's Share-based Compensation Plans

The Company’s share-based compensation plans at December 31, 2011 follow:

Plan Name	Shares Authorized for Grant		Awards Outstanding		Shares Available for Grant
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended		15,250,000		6,293,495		4,399,951
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended (“1997 Plan”)		—		1,983,300		—
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (“2001 Plan”)		—		35,800		—

Weighted-Average Assumptions Used to Estimate the Grant Date Fair Values for Stock Options Granted

Weighted-average assumptions used to estimate grant date fair values for stock options granted in the years ended December 31, 2011, 2010 and 2009 follow:

	2011			2010			2009
Volatility		45.97	%		45.98	%		49.90	%
Expected term (in years)		5.00			5.00			4.00
Dividend yield		0.67	%		1.35	%		1.67	%
Risk-free interest rate		2.34	%		2.47	%		1.67	%

Stock Option Activity

Stock option activity for the year ended December 31, 2011 follows:

	Shares			Weighted-average exercise price
Outstanding at beginning of year		7,710,102		$	19.58
Granted		419,500		$	30.28
Exercised		(1,048,307	)	$	16.04
Cancelled		—		$	—
Expired		—		$	—
Outstanding at end of year		7,081,295		$	20.73
Exercisable at end of year		6,077,635		$	20.69

Additional Information with Respect to Options Granted, Vested and Exercised

Additional information with respect to options granted, vested and exercised during the years ended December 31, 2011, 2010 and 2009 follows:

	2011		2010		2009
Weighted-average grant date fair value of stock options granted (per share)	$	12.24	$	5.69	$	4.71
Grant date fair value of stock options vested during the year (in thousands)	$	5,639	$	5,553	$	6,973
Aggregate intrinsic value of stock options exercised (in thousands)	$	12,663	$	523	$	510

Restricted Stock Activity

Restricted stock activity for the year ended December 31, 2011 follows:

	Shares			Weighted- average Grant Date Fair Value
Non-vested restricted stock outstanding at beginning of year		1,114,051		$	16.05
Granted		782,300		$	30.46
Vested		(599,394	)	$	17.60
Forfeited		(83,158	)	$	22.58
Non-vested restricted stock outstanding at end of year		1,213,799		$	24.13

Restricted Stock Unit Activity

Restricted stock unit activity for the year ended December 31, 2011 follows:

	Shares			Weighted Average Grant Date Fair Value
Non-vested restricted stock units outstanding at beginning of year		17,834		$	19.73
Granted		10,000		$	30.63
Vested		(10,333	)	$	23.94
Forfeited		—		$	—
Non-vested restricted stock units outstanding at end of year		17,501		$	23.47

Employee Stock Option

Additional Information with Respect to Non-vested Shares

Additional information as of December 31, 2011 with respect to these non-vested options follows:

Aggregate intrinsic value	$3.3 million
Weighted-average remaining contractual term	8.56 years
Weighted-average remaining expected term	3.45 years
Weighted-average remaining vesting period	1.52 years
Unrecognized compensation cost	$6.7 million

Restricted Stock Awards

Additional Information with Respect to Non-vested Shares

Additional information as of December 31, 2011 with respect to these non-vested shares follows:

Aggregate intrinsic value	$22.6 million
Weighted-average remaining vesting period	1.90 years
Unrecognized compensation cost	$22.6 million

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Leases

12 Months Ended

Dec. 31, 2011

Leases

12. Leases

The Company incurred rent expense of $35.0 million, $18.1 million and $11.9 million for the years 2011, 2010 and 2009, respectively. Rent expense is primarily related to short-term equipment rentals that are generally passed through to customers. The Company’s obligations under non-cancelable operating lease agreements are not material to its operations or cash flows.