10-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
(Mark One)
Q	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended March 31, 2016
OR
¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from ________________ to ______________
Commission File Number:  001-14273
CORE LABORATORIES N.V.
(Exact name of registrant as specified in its charter)
The Netherlands		Not Applicable
(State or other jurisdiction of		(I.R.S. Employer Identification No.)
incorporation or organization)
Strawinskylaan 913
Tower A, Level 9
1077 XX Amsterdam
The Netherlands		Not Applicable
(Address of principal executive offices)		(Zip Code)
(31-20) 420-3191
(Registrant's telephone number, including area code)
None
(Former name, former address and former fiscal year, if changed since last report)

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 Q  No ¨

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

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

Large accelerated filer Q	Accelerated filer  o	Non-accelerated filer  o	Smaller reporting company  o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ¨  No Q

The number of common shares of the registrant, par value EUR 0.02 per share, outstanding at April 21, 2016 was 42,399,183.

CORE LABORATORIES N.V.
FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2016
INDEX
PART I - FINANCIAL INFORMATION
		Page
Item 1.	Financial Statements
	Consolidated Balance Sheets (Unaudited) at March 31, 2016 and December 31, 2015	1
	Consolidated Statements of Operations (Unaudited) for the Three Months Ended March 31, 2016 and 2015	2
	Consolidated Statements of Comprehensive Income (Unaudited) for the Three Months Ended March 31, 2016 and 2015	3
	Consolidated Statements of Cash Flows (Unaudited) for the Three Months Ended March 31, 2016 and 2015	4
	Notes to the Unaudited Consolidated Interim Financial Statements	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	16
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	22
Item 4.	Controls and Procedures	22
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	24
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	24
Item 6.	Exhibits	25
	Signature	26

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

CORE LABORATORIES N.V.

CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share data)

	March 31, 2016			December 31, 2015
ASSETS	(Unaudited)
CURRENT ASSETS:
Cash and cash equivalents	$	16,665		$	22,494
Accounts receivable, net of allowance for doubtful accounts of $3,240 and $4,136 at 2016 and 2015, respectively	122,496			145,689
Inventories	41,702			40,906
Prepaid expenses	12,191			12,053
Income taxes receivable	7,711			7,209
Other current assets	6,645			10,196
TOTAL CURRENT ASSETS	207,410			238,547
PROPERTY, PLANT AND EQUIPMENT, net	138,860			143,211
INTANGIBLES, net	9,857			10,041
GOODWILL	178,159			178,159
DEFERRED TAX ASSETS, net	9,178			11,693
OTHER ASSETS	43,786			43,607
TOTAL ASSETS	$	587,250		$	625,258
LIABILITIES AND EQUITY (DEFICIT)
CURRENT LIABILITIES:
Accounts payable	$	34,753		$	33,474
Accrued payroll and related costs	34,756			36,475
Taxes other than payroll and income	7,937			9,495
Unearned revenue	14,272			14,101
Income taxes payable	4,310			1,733
Other current liabilities	12,388			25,480
TOTAL CURRENT LIABILITIES	108,416			120,758
LONG-TERM DEBT, net	407,112			430,987
DEFERRED COMPENSATION	42,598			43,478
DEFERRED TAX LIABILITIES, net	7,983			4,881
OTHER LONG-TERM LIABILITIES	49,123			48,853
COMMITMENTS AND CONTINGENCIES (Note 6)
EQUITY (DEFICIT):
Preference shares, EUR 0.02 par value; 6,000,000 shares authorized, none issued or outstanding	—			—
Common shares, EUR 0.02 par value; 200,000,000 shares authorized, 44,350,002 issued and 42,391,696 outstanding at 2016 and 44,350,002 issued and 42,375,905 outstanding at 2015	1,142			1,142
Additional paid-in capital	2,356			—
Retained earnings	210,983			219,207
Accumulated other comprehensive income (loss)	(11,330		)	(10,538		)
Treasury shares (at cost), 1,958,306 at 2016 and 1,974,097 at 2015	(236,533		)	(238,875		)
Total Core Laboratories N.V. shareholders' equity (deficit)	(33,382		)	(29,064		)
Non-controlling interest	5,400			5,365
TOTAL EQUITY (DEFICIT)	(27,982		)	(23,699		)
TOTAL LIABILITIES AND EQUITY (DEFICIT)	$	587,250		$	625,258

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

1

CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

	Three Months Ended
	March 31,
	2016			2015
	(Unaudited)
REVENUE:
Services	$	122,770		$	162,974
Product sales	30,877			50,669
Total revenue	153,647			213,643
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below	85,294			102,795
Cost of product sales, exclusive of depreciation expense shown below	27,520			41,479
General and administrative expense, exclusive of depreciation expense shown below	11,050			12,674
Depreciation	6,627			6,345
Amortization	220			221
Other (income) expense, net	(4		)	322
Severance and other charges	—			7,090
OPERATING INCOME	22,940			42,717
Interest expense	3,434			2,403
Income before income tax expense	19,506			40,314
Income tax expense	4,389			9,272
Net income	15,117			31,042
Net income (loss) attributable to non-controlling interest	35			(357		)
Net income attributable to Core Laboratories N.V.	$	15,082		$	31,399
EARNINGS PER SHARE INFORMATION:
Basic earnings per share attributable to Core Laboratories N.V.	$	0.36		$	0.72
Diluted earnings per share attributable to Core Laboratories N.V.	$	0.35		$	0.72
Cash dividends per share	$	0.55		$	0.55
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic	42,380			43,340
Diluted	42,520			43,466

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

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CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands)

	Three Months Ended
	March 31,
	2016			2015
	(Unaudited)
Net income	$	15,117		$	31,042
Other comprehensive income:
Derivatives
Gain (loss) in fair value of interest rate swaps	(1,620		)	(1,140		)
Interest rate swap amounts reclassified to interest expense	213			243
Income taxes on derivatives	518			—
Total derivatives	(889		)	(897		)
Pension and other postretirement benefit plans
Prior service cost
Amortization to net income of transition asset	—			(22		)
Amortization to net income of prior service cost	(19		)	(19		)
Amortization to net income of actuarial loss	148			183
Income taxes on pension and other postretirement benefit plans	(32		)	(35		)
Total pension and other postretirement benefit plans	97			107
Total other comprehensive income (loss)	(792		)	(790		)
Comprehensive income	14,325			30,252
Comprehensive income (loss) attributable to non-controlling interest	35			(357		)
Comprehensive income attributable to Core Laboratories N.V.	$	14,290		$	30,609

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

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CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Three Months Ended
	March 31,
	2016			2015
	(Unaudited)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	15,117		$	31,042
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	5,462			5,208
Depreciation and amortization	6,847			6,566
Changes to value of life insurance policies	(568		)	(816		)
Deferred income taxes	(923		)	1,996
Other non-cash items	(1,334		)	1,450
Changes in assets and liabilities:
Accounts receivable	23,895			36,884
Inventories	(916		)	(5,937		)
Prepaid expenses and other current assets	(254		)	8,137
Other assets	1,109			1,043
Accounts payable	1,819			1,635
Accrued expenses	(3,222		)	(10,515		)
Unearned revenue	170			3,768
Other long-term liabilities	(1,105		)	(932		)
Net cash provided by operating activities	46,097			79,529
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(2,858		)	(6,869		)
Patents and other intangibles	(36		)	(186		)
Proceeds from sale of assets	408			726
Premiums on life insurance	(532		)	(647		)
Net cash used in investing activities	(3,018		)	(6,976		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(37,838		)	(18,000		)
Proceeds from debt borrowings	13,000			35,000
Excess tax benefits from stock-based compensation	(68		)	(68		)
Debt financing costs	—			(125		)
Dividends paid	(23,306		)	(23,940		)
Repurchase of common shares	(696		)	(69,633		)
Net cash used in financing activities	(48,908		)	(76,766		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(5,829		)	(4,213		)
CASH AND CASH EQUIVALENTS, beginning of period	22,494			23,350
CASH AND CASH EQUIVALENTS, end of period	$	16,665		$	19,137

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

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CORE LABORATORIES N.V.

NOTES TO THE UNAUDITED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements include the accounts of Core Laboratories N.V. and its subsidiaries for which we have a controlling voting interest and/or a controlling financial interest. These financial statements have been prepared in accordance with United States ("U.S.") generally accepted accounting principles ("GAAP") for interim financial information using the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all of the information and footnote disclosures required by U.S. GAAP and should be read in conjunction with the audited financial statements and the summary of significant accounting policies and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015 (the "2015 Annual Report").

Core Laboratories N.V. uses the equity method of accounting for investments in which it has less than a majority interest and over which it does not exercise control but does exert significant influence. We use the cost method to record certain other investments in which we own less than 20% of the outstanding equity and do not exercise control or exert significant influence. Non-controlling interests have been recorded to reflect outside ownership attributable to consolidated subsidiaries that are less than 100% owned. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included in these financial statements. Furthermore, the operating results presented for the three months ended March 31, 2016 may not necessarily be indicative of the results that may be expected for the year ending December 31, 2016.

Core Laboratories N.V.'s balance sheet information for the year ended December 31, 2015 was derived from the 2015 audited consolidated financial statements but does not include all disclosures in accordance with U.S. GAAP.

Certain reclassifications were made to prior period amounts in order to conform to the current period presentation. These reclassifications had no impact on the reported net income or cash flows for the three months ended March 31, 2015.

References to "Core Lab", the "Company", "we", "our" and similar phrases are used throughout this Quarterly Report on Form 10-Q and relate collectively to Core Laboratories N.V. and its consolidated subsidiaries.

2.  INVENTORIES

Inventories consist of the following (in thousands):

	March 31, 2016		December 31, 2015
Finished goods	$	27,285	$	25,778
Parts and materials	12,693		12,637
Work in progress	1,724		2,491
Total inventories	$	41,702	$	40,906

We include freight costs incurred for shipping inventory to customers in the Cost of product sales line of the Consolidated Statements of Operations.

3.  ACQUISITIONS

In the second quarter of 2015, we acquired a business providing additional reservoir fluids technology for $17.2 million in cash. We accounted for this acquisition by allocating the purchase price to the net assets acquired based on their estimated fair values at the date of acquisition, resulting in an increase to goodwill of $13.7 million and an increase of $2.0 million in intangible assets. The acquisition of this entity did not have a material impact on our Consolidated Balance Sheet or Consolidated Statements of Operations, and was recorded in the Reservoir Description business segment.

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4.  LONG-TERM DEBT

We have no capital lease obligations. Long-term debt is summarized in the following table (in thousands):

	March 31, 2016			December 31, 2015
Senior notes	$	150,000		$	150,000
Credit facility	259,000			283,000
Other indebtedness	1,406			2,244
Total debt	410,406			435,244
Less: Short-term debt included in other indebtedness	(1,406		)	(2,244		)
Less: Debt issuance costs	(1,888		)	(2,013		)
Long-term debt, net	$	407,112		$	430,987

We have two series of senior notes outstanding with an aggregate principal amount of $150 million ("Senior Notes") issued in a private placement transaction. Series A consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.01% and are due in full on September 30, 2021. Series B consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.11% and are due in full on September 30, 2023. Interest on each series of the Senior Notes is payable semi-annually on March 30 and September 30.

We maintain a revolving credit facility ("Credit Facility") that allows for an aggregate borrowing capacity of $400 million. The Credit Facility also provides an option to increase the commitment under the Credit Facility by an additional $50 million to bring the total borrowings available to $450 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.25% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due August 29, 2019, when the Credit Facility matures. Our available capacity at any point in time is reduced by borrowings outstanding at the time and outstanding letters of credit which totaled $25.8 million at March 31, 2016, resulting in an available borrowing capacity under the Credit Facility of $115.2 million. In addition to those items under the Credit Facility, we had $11.1 million of outstanding letters of credit and performance guarantees and bonds from other sources as of March 31, 2016.

The terms of the Credit Facility and Senior Notes require us to meet certain covenants, including, but not limited to, an interest coverage ratio (consolidated EBITDA divided by interest expense) and a leverage ratio (consolidated net indebtedness divided by consolidated EBITDA), where consolidated EBITDA (as defined in each agreement) and interest expense are calculated using the most recent four fiscal quarters. The Credit Facility has the more restrictive covenants with a minimum interest coverage ratio of 3.0 to 1.0 and a maximum leverage ratio of 2.5 to 1.0. We believe that we are in compliance with all such covenants contained in our credit agreements. Certain of our material, wholly-owned subsidiaries are guarantors or co-borrowers under the Credit Facility and Senior Notes.

In 2014, we entered into two interest rate swap agreements for a total notional amount of $50 million. See Note 12 - Derivative Instruments and Hedging Activities.

The estimated fair value of total debt at March 31, 2016 and December 31, 2015 approximated the book value of total debt. The fair value was estimated using Level 2 inputs by calculating the sum of the discounted future interest and principal payments through the date of maturity.

5.  PENSION

Defined Benefit Plan

We provide a non-contributory defined benefit pension plan for substantially all of our Dutch employees ("Dutch Plan") who were hired prior to 2007. The pension benefit is based on years of service and final pay or career average pay, depending on when the employee began participating. The benefits earned by the employees are immediately vested.

6

The following table summarizes the components of net periodic pension cost under the Dutch Plan for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Service cost	$	358		$	463
Interest cost	327			309
Expected return on plan assets	(275		)	(256		)
Amortization of transition asset	—			(22		)
Amortization of prior service cost	(19		)	(19		)
Amortization of actuarial loss	148			183
Net periodic pension cost	$	539		$	658

During the three months ended March 31, 2016, we contributed approximately $1.0 million to fund the estimated 2016 premiums on investment contracts held by the Dutch Plan.

6. COMMITMENTS AND CONTINGENCIES

We have been and may from time to time be named as a defendant in legal actions that arise in the ordinary course of business. These include, but are not limited to, employment-related claims and contractual disputes or claims for personal injury or property damage which occur in connection with the provision of our services and products. Management does not currently believe that any of our pending contractual, employment-related, personal injury or property damage claims and disputes will have a material effect on our future results of operations, financial position or cash flow.

7.  EQUITY (DEFICIT)

During the three months ended March 31, 2016, we repurchased 6,365 of our common shares for $0.7 million. These consisted of rights to shares that were surrendered to us pursuant to the terms of a stock-based compensation plan in consideration of the participants' tax burdens that may result from the issuance of common shares under that plan. Such common shares, unless canceled, may be reissued for a variety of purposes such as future acquisitions, non-employee director stock awards or employee stock awards. We distributed 22,156 treasury shares upon vesting of stock-based awards during the three months ended March 31, 2016.

In February 2016, we paid a quarterly dividend of $0.55 per share of common stock. In addition, on April 14, 2016, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on May 4, 2016 and payable on May 24, 2016.

7

The following table summarizes our changes in equity for the three months ended March 31, 2016 (in thousands):

	Common Shares		Additional Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity (Deficit)
December 31, 2015	$	1,142	$	—		$	219,207		$	(10,538	)	$	(238,875	)	$	5,365	$	(23,699	)
Stock based-awards	—		2,424			—			—			3,038			—		5,462
Tax benefit of stock-based awards issued	—		(68		)	—			—			—			—		(68		)
Repurchase of common shares	—		—			—			—			(696		)	—		(696		)
Dividends paid	—		—			(23,306		)	—			—			—		(23,306		)
Amortization of deferred pension costs, net of tax	—		—			—			97			—			—		97
Interest rate swaps, net of tax	—		—			—			(889		)	—			—		(889		)
Net income	—		—			15,082			—			—			35		15,117
March 31, 2016	$	1,142	$	2,356		$	210,983		$	(11,330	)	$	(236,533	)	$	5,400	$	(27,982	)

Accumulated other comprehensive income (loss) consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
Transition asset	$	—		$	—
Prior service cost	647			661
Unrecognized net actuarial loss	(10,090		)	(10,201		)
Fair value of derivatives, net of tax	(1,887		)	(998		)
Total accumulated other comprehensive income (loss)	$	(11,330	)	$	(10,538	)

8.  EARNINGS PER SHARE

We compute basic earnings per common share by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common and potential common shares include additional shares in the weighted average share calculations associated with the incremental effect of dilutive restricted stock awards and contingently issuable shares, as determined using the treasury stock method. The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average basic common shares outstanding	42,380	43,340
Effect of dilutive securities:
Performance shares	83	64
Restricted stock	57	62
Weighted average diluted common and potential common shares outstanding	42,520	43,466

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9. OTHER (INCOME) EXPENSE, NET

The components of other (income) expense, net, were as follows (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Sale of assets	$	(366	)	$	(135	)
Results of non-consolidated subsidiaries	(188		)	(44		)
Foreign exchange	779			840
Rents and royalties	(101		)	(136		)
Other, net	(128		)	(203		)
Total other (income) expense, net	$	(4	)	$	322

Foreign exchange (gain) loss, net by currency is summarized in the following table (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Australian Dollar	125			119
British Pound	228			374
Canadian Dollar	(1		)	1,274
Euro	210			(1,055		)
Other currencies, net	217			128
Total (gain) loss, net	$	779		$	840

10.  INCOME TAX EXPENSE

The effective tax rates for the three months ended March 31, 2016 and 2015 were 22.5% and 23.0%, respectively. Income tax expense of $4.4 million in the first quarter of 2016decreased by $4.9 million compared to $9.3 million in the same period in 2015, primarily in the United States as taxable income recognized in the United States decreased by $15.1 million in 2016 compared to 2015. No other jurisdiction in which we operate had a material change in income tax expense.

Subsequent to March 31, 2016, our U.S. subsidiaries settled an audit covering the years 2010 through 2012 with the Internal Revenue Service that will result in the release of reserves for uncertain tax positions in the amount of $0.9 million in the second quarter of 2016.

11.  SEVERANCE AND OTHER CHARGES

In 2015, in response to reduced spending by our clients on their oil and gas fields as a result of lower commodity prices for crude oil and natural gas, we reduced our cost structure, primarily through a reduction in our workforce, to better align with the decreasing activity levels into the foreseeable future. As a result of these cost reductions, in 2015, we recorded severance charges of $8.8 million, of which $6.4 million was recorded in the first quarter of 2015. Approximately $2.4 million was accrued and remaining to be paid at March 31, 2016.

During the first quarter of 2016, we continued to closely monitor rig counts, crude oil and natural gas prices, and activity levels within the industry. We continued to execute our cost reduction initiative which began in the first quarter of 2015, but no additional expenses associated with severance or asset impairments were recorded during the first quarter of 2016.

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12.  DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

We are exposed to market risks related to fluctuations in interest rates. To mitigate these risks, we utilize derivative instruments in the form of interest rate swaps. We do not enter into derivative transactions for speculative purposes.

Interest Rate Risk

Our Credit Facility bears interest at variable rates from LIBOR plus 1.25% to a maximum of LIBOR plus 2.00%. We are subject to interest rate risk on the debt carried through our Credit Facility.

In 2014, we entered into two interest rate swap agreements for a total notional amount of $50 million to hedge changes in the variable rate interest expense on $50 million of our existing or replacement LIBOR-priced debt. Under the first swap agreement of $25 million, we have fixed the LIBOR portion of the interest rate at 1.73% through August 29, 2019, and under the second swap agreement of $25 million, we have fixed the LIBOR portion of the interest rate at 2.5% through August 29, 2024. Each swap is measured at fair value and recorded in our Consolidated Balance Sheet as a liability. They are designated and qualify as cash flow hedging instruments and are highly effective. Unrealized losses are deferred to shareholders' equity as a component of accumulated other comprehensive loss (AOCL) and are recognized in income as an increase to interest expense in the period

in which the related cash flows being hedged are recognized in expense.

At March 31, 2016, we had fixed rate long-term debt aggregating $200 million and variable rate long-term debt aggregating $209 million, after taking into account the effect of the swaps.

The fair values of outstanding derivative instruments are as follows:

	Fair Value of Derivatives
	March 31, 2016		December 31, 2015		Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	754	$	353	Other long-term liabilities
10 year interest rate swap	2,235		1,229		Other long-term liabilities
	$	2,989	$	1,582

The fair value of all outstanding derivatives was determined using a model with inputs that are observable in the market (Level 2) or can be derived from or corroborated by observable data.

The effect of the interest rate swaps on the Consolidated Statement of Operations was as follows:

	Three Months Ended
	March 31, 2016		March 31, 2015		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	82	$	97	Increase to interest expense
10 year interest rate swap	131		146		Increase to interest expense
	$	213	$	243

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13.  FINANCIAL INSTRUMENTS

The Company's only financial assets and liabilities which involve fair value measures relate to certain aspects of the Company's benefit plans and our derivative instruments. We use the market approach to value certain assets and liabilities at fair value using significant other observable inputs (Level 2) with the assistance of a third party specialist. We do not have any assets or liabilities measured at fair value on a recurring basis using quoted prices in an active market (Level 1) or significant unobservable inputs (Level 3). Gains and losses related to the fair value changes in the deferred compensation assets and liabilities are recorded in General and administrative expense in the Consolidated Statements of Operations. Gains and losses related to the fair value of the interest rate swaps are recorded in Other comprehensive income (loss). The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			March 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	22,582	$	—	$	22,582	$	—
Liabilities:
Deferred compensation plan	$	27,967	$	—	$	27,967	$	—
5 year interest rate swap	754		—		754		—
10 year interest rate swap	2,235		—		2,235		—
	$	30,956	$	—	$	30,956	$	—

			Fair Value Measurement at
			December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	23,737	$	—	$	23,737	$	—
Liabilities:
Deferred compensation plan	$	29,155	$	—	$	29,155	$	—
5 year interest rate swap	353		—		353		—
10 year interest rate swap	1,229		—		1,229		—
	$	30,737	$	—	$	30,737	$	—
(1) Trust assets consist of the cash surrender value of life insurance policies intended to assist in the funding of the deferred compensation plan and are included in Other assets in the Balance Sheet.

14.  SEGMENT REPORTING

We operate our business in three reportable segments.  These complementary segments provide different services and products and utilize different technologies for improving reservoir performance and increasing oil and gas recovery from new and existing fields.

• Reservoir Description: Encompasses the characterization of petroleum reservoir rock, fluid and gas samples. We provide analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry.

• Production Enhancement: Includes services and products relating to reservoir well completions, perforations, stimulations and production. We provide integrated services to evaluate the effectiveness of well completions and to develop solutions aimed at increasing the effectiveness of enhanced oil recovery projects.

• Reservoir Management: Combines and integrates information from reservoir description and production enhancement services to increase production and improve recovery of oil and gas from our clients' reservoirs.

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Results for these segments are presented below. We use the same accounting policies to prepare our segment results as are used to prepare our Consolidated Financial Statements. All interest and other non-operating income (expense) is attributable to Corporate & Other and is not allocated to specific segments. Summarized financial information concerning our segments is shown in the following table (in thousands):

	Reservoir Description		Production Enhancement		Reservoir Management		Corporate & Other 1			Consolidated
Three Months Ended March 31, 2016
Revenue from unaffiliated clients	$	101,549	$	44,145	$	7,953	$	—		$	153,647
Inter-segment revenue	1,907		220		5		(2,132		)	—
Segment operating income (loss)	18,220		4,141		487		92			22,940
Total assets (at end of period)	316,705		202,470		19,282		48,793			587,250
Capital expenditures	2,074		378		8		398			2,858
Depreciation and amortization	4,436		1,425		363		623			6,847
Three Months Ended March 31, 2015
Revenue from unaffiliated clients	$	121,759	$	75,145	$	16,739	$	—		$	213,643
Inter-segment revenue	2,776		717		149		(3,642		)	—
Segment operating income (loss)	28,530		9,923		3,866		398			42,717
Total assets (at end of period)	312,129		233,414		29,505		54,960			630,008
Capital expenditures	4,437		1,803		221		408			6,869
Depreciation and amortization	3,783		1,761		431		591			6,566

(1) "Corporate & Other" represents those items that are not directly related to a particular segment and eliminations.

15. RECENT ACCOUNTING PRONOUNCEMENTS

In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-02 ("Amendments to the Consolidation Analysis") which amends the guidelines for determining whether certain legal entities should be consolidated. This update eliminates the presumption that a general partner should consolidate a limited partnership and modifies the evaluation of whether limited partnerships are variable interest entities or voting interest entities. Overall, the amendments in this Update are an improvement to current GAAP because they simplify the Codification and reduce the number of consolidation models through the elimination of the indefinite deferral of Statement 167 and because they place more emphasis on risk of loss when determining a controlling financial interest. This update is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. We adopted this standard on January 1, 2016. The adoption of this standard had no effect on our current consolidated financial statements or on the entities that we consolidate.

In November 2015, the FASB issued ASU 2015-17 ("Balance Sheet Classification of Deferred Taxes") to simplify the presentation of deferred income taxes. The amendments in this update require that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. This pronouncement is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. We early adopted this standard for our fiscal year beginning on January 1, 2016 and applied the adoption prospectively. The adoption of this standard had no effect on our current Consolidated Statements of Operations and Consolidated Statement of Cash Flows but had an immaterial effect on our Consolidated Balance Sheet with the reclassification of certain deferred tax balance sheet accounts. The comparative prior period Consolidated Balance Sheet as of December 31, 2015 was not retrospectively adjusted.

In May 2014, the FASB issued ASU 2014-09 ("Revenue from Contracts with Customers"), which provides guidance on revenue recognition. The core principle of this guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance requires entities to apply a five-step method to (1) identify the contract(s) with customers; (2) identify the performance obligation(s) in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligation(s) in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017 (on July 9, 2015, the FASB deferred the implementation date for one year). We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

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In July 2015, the FASB issued ASU 2015-11 ("Simplifying the Measurement of Inventory") to require the measurement of inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This pronouncement is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02 ("Leases"), which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The new standard establishes a right-of-use ("ROU") model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. The new standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years with early adoption permitted. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09 ("Improvements to Employee Share-Based Payment Accounting") which simplifies several aspects of accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new standard is effective for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years with early adoption permitted. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion summarizes the financial position of Core Laboratories N.V. and its subsidiaries as of March 31, 2016 and should be read in conjunction with (i) the unaudited consolidated interim financial statements and notes thereto included elsewhere in this Quarterly Report on Form 10-Q ("Quarterly Report") and (ii) the audited consolidated financial statements and accompanying notes to our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (the "2015 Annual Report").

General

Core Laboratories N.V. is a limited liability company incorporated and domiciled in The Netherlands. It was established in 1936 and is one of the world's leading providers of proprietary and patented reservoir description, production enhancement and reservoir management services and products to the oil and gas industry. These services and products can enable our clients to improve reservoir performance and increase oil and gas recovery from their producing fields. Core Laboratories N.V. has over 70 offices in more than 50 countries and employs approximately 4,400 people worldwide.

References to "Core Lab", the "Company", "we", "our" and similar phrases are used throughout this Quarterly Report and relate collectively to Core Laboratories N.V. and its consolidated affiliates.

We operate our business in three reportable segments.  These complementary segments provide different services and products and utilize different technologies for improving reservoir performance and increasing oil and gas recovery from new and existing fields.

• Reservoir Description: Encompasses the characterization of petroleum reservoir rock, fluid and gas samples. We provide analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry.

• Production Enhancement: Includes services and products relating to reservoir well completions, perforations, stimulations and production. We provide integrated services to evaluate the effectiveness of well completions and to develop solutions aimed at increasing the effectiveness of enhanced oil recovery projects.

• Reservoir Management: Combines and integrates information from reservoir description and production enhancement services to increase production and improve recovery of oil and gas from our clients' reservoirs.

Cautionary Statement Regarding Forward-Looking Statements

This Quarterly Report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Certain statements contained in this Management's Discussion and Analysis of Financial Condition and Results of Operations section, including those under the headings "Outlook" and "Liquidity and Capital Resources", and in other parts of this Quarterly Report, are forward-looking. In addition, from time to time, we may publish forward-looking statements relating to such matters as anticipated financial performance, business prospects, technological developments, new products, research and development activities and similar matters. Forward-looking statements can be identified by the use of forward-looking terminology such as "may", "will", "believe", "expect", "anticipate", "estimate", "continue", or other similar words, including statements as to the intent, belief, or current expectations of our directors, officers, and management with respect to our future operations, performance, or positions or which contain other forward-looking information. These forward-looking statements are based on our current expectations and beliefs concerning future developments and their potential effect on us. While management believes that these forward-looking statements are reasonable as and when made, no assurances can be given that the future results indicated, whether expressed or implied, will be achieved. While we believe that these statements are and will be accurate, our actual results and experience may differ materially from the anticipated results or other expectations expressed in our statements due to a variety of risks and uncertainties.

We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. For a more detailed discussion of some of the foregoing risks and uncertainties, see "Item 1A - Risk Factors" in our 2015 Annual Report and in Part II of this Quarterly Report, as well as the other reports filed by us with the Securities and Exchange Commission (“SEC”).

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Outlook

As part of our long-term growth strategy, we continue our long-term efforts to expand our market presence by opening or expanding facilities in strategic areas and realizing synergies within our business lines subject to client demand and market conditions. We believe our market presence provides us a unique opportunity to service clients who have global operations whether they are international oil companies, national oil companies, or independent oil companies.

During 2015, average crude oil prices decreased approximately 48% compared to 2014, which resulted in a significant decrease in activities and spending related to the exploration and production of oil and natural gas. In the fourth quarter of 2015, crude oil prices continued to weaken causing West Texas Intermediate ("WTI") to end the year at $37.13 per barrel, the lowest end-of-year price per barrel in 12 years. The price of WTI crude oil averaged $37.04 per barrel through the first quarter of 2016, which resulted in a further reduction of activity associated with the exploration and production of oil and spending levels from our clients in most major regions across the globe.

In North America, land-based activity continues to be the most significantly impacted by these lower commodity prices. The quarterly average rig count in North America has decreased by 57% compared to the end of the first quarter of 2015 and is down 39% from December 31, 2015. If the WTI crude oil price remains near its current level, we believe the significantly lower levels of industry activity experienced during 2015 and the first quarter of 2016 may continue through the remainder of 2016, which could continue to have a negative impact our North America operations.

Outside of North America, activities associated with the exploration and production of oil and gas have also decreased from 2015 levels, although not as significantly as the land-based activities in North America. The quarterly average international rig count for the first quarter of 2016 is down approximately 20% from the same period in 2015. These reduced international activities have impacted most regions, except the Middle East, where we continue to see sustained levels for the first quarter of 2016. As with North American land-based activity, we believe international activities will also remain at reduced levels, without a meaningful improvement in the current Brent crude oil price.

We saw U.S. crude oil production continue its sharp decline in the first quarter of 2016 which we believe is an indication that the balancing of worldwide crude-oil markets is well underway. With the very steep decline curves associated with the unconventional tight oil reservoirs in the U.S., we now believe that U.S. supply growth rolled over in April of 2015 and that year-over-year crude-oil production in 2016 will be down several hundreds-of-thousands of barrels per day. Therefore, at current industry activity levels, U.S. crude oil production could continue to fall significantly throughout 2016, while worldwide oil production continues to stagnate or decrease slightly because the prior year's international production gains may not be sustainable over the long term.

Response to Decline in Oilfield Services Activities

In 2015, in response to reduced spending by our clients on their oil and gas fields as a result of lower commodity prices for crude oil and natural gas, we reduced our cost structure, primarily through a reduction in our workforce, to better align with the decreasing activity levels into the foreseeable future. As a result of these cost reductions, in 2015, we recorded severance charges of $8.8 million, of which $6.4 million was recorded in the first quarter of 2015. Approximately $2.4 million were accrued and remaining to be paid at March 31, 2016.

During the first quarter of 2016, we continued to closely monitor rig counts, crude oil and natural gas prices, and activity levels within the industry. We continued to execute our cost reduction initiative which began in the first quarter of 2015, but no additional accruals or write-offs were recorded during the first quarter of 2016.

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Results of Operations

Our results of operations as a percentage of applicable revenue were as follows (in thousands):

	Three Months Ended March 31,										$ Change			% Change
	2016					2015					2016/2015			2016/2015
REVENUE:
Services	$	122,770		80	%	$	162,974		76	%	$	(40,204	)	(25	)%
Product sales	30,877			20	%	50,669			24	%	(19,792		)	(39	)%
Total revenue	153,647			100	%	213,643			100	%	(59,996		)	(28	)%
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below*	85,294			69	%	102,795			63	%	(17,501		)	(17	)%
Cost of product sales, exclusive of depreciation expense shown below*	27,520			89	%	41,479			82	%	(13,959		)	(34	)%
Total cost of services and product sales	112,814			73	%	144,274			68	%	(31,460		)	(22	)%
General and administrative expense	11,050			7	%	12,674			6	%	(1,624		)	(13	)%
Depreciation and amortization	6,847			4	%	6,566			3	%	281			4	%
Other (income) expense, net	(4		)	—	%	322			—	%	(326		)	NM
Severance and other charges	—			—	%	7,090			3	%	(7,090		)	NM
Operating income	22,940			15	%	42,717			20	%	(19,777		)	(46	)%
Interest expense	3,434			2	%	2,403			1	%	1,031			43	%
Income before income tax expense	19,506			13	%	40,314			19	%	(20,808		)	(52	)%
Income tax expense	4,389			3	%	9,272			4	%	(4,883		)	(53	)%
Net income	15,117			10	%	31,042			15	%	(15,925		)	(51	)%
Net income (loss) attributable to non-controlling interest	35			—	%	(357		)	—	%	392			NM
Net income attributable to Core Laboratories N.V.	$	15,082		10	%	$	31,399		15	%	$	(16,317	)	(52	)%
"NM"  means not meaningful
* Percentage based on applicable revenue rather than total revenue.

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	Three Months Ended										$ Change			% Change
	Mar 31, 2016					Dec 31, 2015					2016/2015			2016/2015
REVENUE:
Services	$	122,770		80	%	$	141,991		78	%	$	(19,221	)	(14	)%
Product sales	30,877			20	%	40,732			22	%	(9,855		)	(24	)%
Total revenue	153,647			100	%	182,723			100	%	(29,076		)	(16	)%
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below*	85,294			69	%	92,366			65	%	(7,072		)	(8	)%
Cost of product sales, exclusive of depreciation expense shown below*	27,520			89	%	32,343			79	%	(4,823		)	(15	)%
Total cost of services and product sales	112,814			73	%	124,709			68	%	(11,895		)	(10	)%
General and administrative expense	11,050			7	%	12,266			7	%	(1,216		)	(10	)%
Depreciation and amortization	6,847			4	%	7,051			4	%	(204		)	(3	)%
Other (income) expense, net	(4		)	—	%	(798		)	—	%	794			NM
Severance and other charges	—			—	%	15,853			9	%	(15,853		)	NM
Operating income	22,940			15	%	23,642			13	%	(702		)	(3	)%
Interest expense	3,434			2	%	3,391			2	%	43			1	%
Income before income tax expense	19,506			13	%	20,251			11	%	(745		)	(4	)%
Income tax expense	4,389			3	%	4,658			3	%	(269		)	(6	)%
Net income	15,117			10	%	15,593			9	%	(476		)	(3	)%
Net income (loss) attributable to non-controlling interest	35			—	%	176			—	%	(141		)	NM
Net income attributable to Core Laboratories N.V.	$	15,082		10	%	$	15,417		8	%	$	(335	)	(2	)%
"NM"  means not meaningful
* Percentage based on applicable revenue rather than total revenue.

Operating Results for the Three Months EndedMarch 31, 2016 Compared to the Three Months EndedDecember 31, 2015andMarch 31, 2015

Services Revenue

Services revenue decreased to $122.8 million for the first quarter of 2016 from $142.0 million for the fourth quarter of 2015 and $163.0 million for the first quarter of 2015. The average rig count for the first quarter of 2016 was 26% lower than the average rig count during the fourth quarter of 2015; however, our services revenue was down only 14% sequentially, as demand for our analytical, diagnostic, and completion services was less impacted by the significant decrease in drilling activities. Since the end of the first quarter of 2015, prices for WTI and Brent crude oil have further declined 23% and 32%, respectively. As a result, the quarterly average global rig count for the first quarter of 2016 fell by 41% compared to the same period in 2015, primarily driven by decreases in North America. However, over this same time period, our services revenue was down only 25% year over year, as demand for our analytical, diagnostic, and completion services was less impacted by the significant decrease in drilling activities. Our continued focus on worldwide crude oil related and large natural gas liquefaction projects, especially those related to the development of deepwater fields off West and East Africa and the eastern Mediterranean, kept services revenue from declining further.

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Product Sales Revenue

Revenue associated with product sales decreased to $30.9 million for the first quarter of 2016, from $40.7 million for the fourth quarter of 2015 and from $50.7 million for the first quarter of 2015. Our product sales revenue is primarily driven by sales in the North American market where the quarterly average rig count in the first quarter of 2016 declined 39% sequentially and declined 57% year over year; however, as a result of our differentiated well completion products in the market place, our revenue during the first quarter of 2016 decreased only 24% and 39% from our revenue in the fourth and first quarters of 2015, respectively.

Cost of Services

Cost of services expressed as a percentage of services revenue increased to 69% for the three months endedMarch 31, 2016, compared to 65% and 63% for the three months ended December 31 and March 31, 2015, respectively. This increase was primarily due to a reduced absorption rate of our fixed-cost structure across lower revenues in 2016.

Cost of Product Sales

Cost of product sales expressed as a percentage of product sales revenue increased to 89% for the three months endedMarch 31, 2016, compared to 79% and 82% for the three months ended December 31 and March 31, 2015, respectively. This increase was primarily due to a reduced absorption rate of our fixed-cost structure across lower revenue in 2016.

General and Administrative Expense

General and administrative ("G&A") expense includes corporate management and centralized administrative services that benefit our operations. G&A expense for the three months endedMarch 31, 2016 was $11.1 million compared to $12.7 million for the same period in 2015. The decrease is primarily due to lower compensation expense.

Depreciation and Amortization Expense

Depreciation and amortization expense for the three months endedMarch 31, 2016 was $6.8 million compared to $6.6 million for the same period in 2015.

Severance and Other Charges

In 2015, in response to reduced spending by our clients on their oil and gas fields as a result of lower commodity prices for crude oil and natural gas, we reduced our cost structure, primarily through a reduction in our workforce, to better align with the decreasing activity levels into the foreseeable future. As a result of these cost reductions, in 2015, we recorded severance charges of $8.8 million, of which $6.4 million was recorded in the first quarter of 2015. Approximately $2.4 million was accrued and remaining to be paid at March 31, 2016.

During the first quarter of 2016, we continued to closely monitor rig counts, crude oil and natural gas prices, and activity levels within the industry. We continued to execute our cost reduction initiative which began in the first quarter of 2015, but no additional expenses associated with severance or asset impairments were recorded during the first quarter of 2016.

Other (Income) Expense, Net

The components of other (income) expense, net, were as follows (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Sale of assets	$	(366	)	$	(135	)
Results of non-consolidated subsidiaries	(188		)	(44		)
Foreign exchange	779			840
Rents and royalties	(101		)	(136		)
Other, net	(128		)	(203		)
Total other (income) expense, net	$	(4	)	$	322

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Foreign exchange (gain) loss, net by currency is summarized in the following table (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Australian Dollar	125			119
British Pound	228			374
Canadian Dollar	(1		)	1,274
Euro	210			(1,055		)
Other currencies, net	217			128
Total (gain) loss, net	$	779		$	840

Interest Expense

Interest expense for the three months ended March 31, 2016 and 2015 was $3.4 million and $2.4 million, respectively. Interest expense is higher in 2016 due to the increased borrowings on our Credit Facility.

Income Tax Expense

The effective tax rates for the three months ended March 31, 2016 and 2015 were 22.5% and 23.0%, respectively. Income tax expense of $4.4 million in the first quarter of 2016decreased by $4.9 million compared to $9.3 million in the same period in 2015, primarily in the United States as taxable income recognized in the United States decreased by $15.1 million in 2016 compared to 2015. No other jurisdiction in which we operate had a material change in income tax expense.

Subsequent to March 31, 2016, our U.S. subsidiaries settled an audit covering the years 2010 thru 2012 with the Internal Revenue Service that will result in the release of reserves for uncertain tax positions in the amount of $0.9 million in the second quarter of 2016.

Segment Analysis

Our operations are managed primarily in three complementary reportable segments - Reservoir Description, Production Enhancement and Reservoir Management. The following tables summarize our results by segment for the three months ended March 31, 2016 and 2015 and December 31, 2015 (in thousands):

	Three Months Ended March 31,				$ Change			% Change		Three Months Ended December 31,			$ Change			% Change
	2016		2015		2016/2015			2016/2015		2015			Q1/Q4			Q1/Q4
Revenue:
Reservoir Description	$	101,549	$	121,759	$	(20,210	)	(17	)%	$	114,759		$	(13,210	)	(12	)%
Production Enhancement	44,145		75,145		(31,000		)	(41	)%	56,572			(12,427		)	(22	)%
Reservoir Management	7,953		16,739		(8,786		)	(52	)%	11,392			(3,439		)	(30	)%
Consolidated	$	153,647	$	213,643	$	(59,996	)	(28	)%	$	182,723		$	(29,076	)	(16	)%
Operating income (loss):
Reservoir Description	$	18,220	$	28,530	$	(10,310	)	(36	)%	$	21,220		$	(3,000	)	(14	)%
Production Enhancement	4,141		9,923		(5,782		)	(58	)%	(639		)	4,780			748	%
Reservoir Management	487		3,866		(3,379		)	(87	)%	3,541			(3,054		)	(86	)%
Corporate and Other1	92		398		(306		)	NM		(480		)	572			NM
Consolidated	$	22,940	$	42,717	$	(19,777	)	(46	)%	$	23,642		$	(702	)	(3	)%
(1) "Corporate and Other" represents those items that are not directly related to a particular segment
"NM"  means not meaningful

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Reservoir Description

Revenue from the Reservoir Description segment was $101.5 million in the first quarter of 2016, a decrease of 12% from $114.8 million in the fourth quarter of 2015 and a decrease of 17% from $121.8 million in the first quarter of 2015. This segment’s operations continue to work on large-scale, long-term crude-oil and LNG projects with an emphasis on deepwater developments and international markets. We continue to focus on large-scale core analyses and reservoir fluids characterization studies in the Asia-Pacific areas, offshore West and East Africa, the Eastern Mediterranean region and the Middle East, including Kuwait and the United Arab Emirates.

Operating income was $18.2 million in the first quarter of 2016, a decrease of 14% compared to $21.2 million in the fourth quarter of 2015 and a decrease of 36% compared to $28.5 million in the first quarter of 2015. A charge for severance and other charges was recorded in the fourth and first quarters of 2015 for $7.9 million and $4.3 million, respectively. Operating income decreased primarily due to our fixed-cost structure not being fully absorbed on lower revenue in 2016 when compared to 2015. Operating margins were 18% in the first quarter of 2016, unchanged from the fourth quarter of 2015, but down from 23% in the first quarter of 2015. This segment emphasizes technologically demanding services on internationally-based development and production-related crude oil projects over more cyclical exploration-related projects.

Production Enhancement

Revenue from the Production Enhancement segment was $44.1 million in the first quarter of 2016, a decrease of 22% from $56.6 million in the fourth quarter of 2015 compared to the average horizontal rig count that decreased 43% during that time. First quarter 2016 revenue decreased 41% from $75.1 million in the first quarter of 2015 compared to the average horizontal rig count that decreased 60% during that same time period. This significantly lower industry activity reduced demand for our products associated with land-based completion of oil wells in U.S. unconventional developments.

Operating income in the first quarter of 2016 was $4.1 million, an increase from a loss of $0.6 million in the fourth quarter of 2015 and a decrease from $9.9 million in the first quarter of 2015. The increase in sequential operating income was due to the charge of $7.9 million for severance and other charges recorded in the fourth quarter of 2015. The decrease in year-over-year operating income was primarily due to decreased revenue in 2016 caused by the continued reduction in activities and spending of our clients, primarily in North America. Operating margins were 9% in the first quarter of 2016, down from 13% in the same period of 2015 as a result of absorbing less of our fixed costs on lower revenue.

Reservoir Management

Revenue from the Reservoir Management segment was $8.0 million in the first quarter of 2016, a decrease of $3.4 million from the fourth quarter of 2015 and a decrease of $8.8 million from the first quarter of 2015. The decrease in 2016 when compared to 2015 is primarily due to the decrease of oil commodity prices and, as a result, greatly reduced or eliminated discretionary spending from our oil and gas clients. We continue to have interest in our existing multi-client reservoir studies such as the Duvernay Shale Project in Canada and the Tight Oil Reservoirs of the Midland Basin study as well as our new joint-industry projects in the Williston Basin targeting the tight oil of the entire Three Forks sections and a study in the Appalachian Basin of the emerging Devonian shales in the liquids window.

Operating income in the first quarter of 2016 decreased to $0.5 million from $3.5 million during the fourth quarter of 2015 and $3.9 million during the first quarter of 2015. The decrease in the first quarter of 2016, when compared to each period in 2015, was due primarily to decreased revenue. We are still focused on our joint industry projects, including the Utica, Duvernay, Montney, Wilrich, Mississippi Lime and Central Atlantic studies and the Marcellus, Niobrara, Wolfcamp, Eaglebine and Eagle Ford plays. Operating margins were 6% in the first quarter of 2016, down from 31% in the fourth quarter of 2015, and 23% in the first quarter of 2015. Operating margins for Reservoir Management can fluctuate due to the sale of fully completed studies, which generate significant incremental margins.

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Liquidity and Capital Resources

General

We have historically financed our activities through cash on hand, cash flows from operations, bank credit facilities, equity financing and the issuance of debt. Cash flows from operating activities provides the primary source of funds to finance operating needs, capital expenditures and our dividend and share repurchase programs. If necessary, we supplement this cash flow with borrowings under bank credit facilities to finance some capital expenditures, business acquisitions, or the repurchase of the Company's common shares. As we are a Netherlands holding company, we conduct substantially all of our operations through subsidiaries. Our cash availability is largely dependent upon the ability of our subsidiaries to pay cash dividends or otherwise distribute or advance funds to us. There are no restrictions preventing any of our subsidiaries from repatriating earnings, and there are no restrictions or income taxes associated with distributing cash to the parent company through loans or advances. As of March 31, 2016, approximately $15.0 million of our $16.7 million of cash was held by our foreign subsidiaries.

We utilize the non-GAAP financial measure of free cash flow to evaluate our cash flows and results of operations. Free cash flow is defined as net cash provided by operating activities (which is the most directly comparable GAAP measure) less cash paid for capital expenditures. Management believes that free cash flow provides useful information to investors regarding the cash available in the period that was in excess of our needs to fund our capital expenditures and operating activities. Free cash flow is not a measure of operating performance under GAAP, and should not be considered in isolation nor construed as an alternative to operating profit, net income (loss) or cash flows from operating, investing or financing activities, each as determined in accordance with GAAP. Free cash flow does not represent residual cash available for distribution because we may have other non-discretionary expenditures that are not deducted from the measure. Moreover, since free cash flow is not a measure determined in accordance with GAAP and thus is susceptible to varying interpretations and calculations, free cash flow as presented, may not be comparable to similarly titled measures presented by other companies. The following table reconciles this non-GAAP financial measure to the most directly comparable measure calculated and presented in accordance with GAAP for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended March 31,				% Change
	2016		2015		2016/2015
Free cash flow calculation:
Net cash provided by operating activities	$	46,097	$	79,529	(42	)%
Less: cash paid for capital expenditures	2,858		6,869		(58	)%
Free cash flow	$	43,239	$	72,660	(40	)%

The decrease in free cash flow for the first three months of 2016 compared to the same period in 2015 was primarily due to lower net income and less significant improvements in working capital, partially offset by lower capital expenditures.

Cash Flows

The following table summarizes cash flows for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended March 31,						% Change
	2016			2015			2016/2015
Cash provided by/(used in):
Operating activities	$	46,097		$	79,529		(42	)%
Investing activities	(3,018		)	(6,976		)	(57	)%
Financing activities	(48,908		)	(76,766		)	(36	)%
Net change in cash and cash equivalents	$	(5,829	)	$	(4,213	)	38	%

Cash flows from operating activities for the first three months of 2016 compared to the same period in 2015 decreased primarily due to lower net income and less significant improvements to working capital.

The decrease in cash flows used in investing activities during the first three months of 2016 compared to the same period in 2015 was primarily attributable to lower capital expenditures in 2016.

21

Cash flows used in financing activities decreased for the first three months of 2016 compared to the same period in 2015. During the first three months of 2016, we decreased our debt by $25 million, as compared to increasing it by $17 million during the first three months of 2015. In the first three months of 2016, we repurchased 6,365 shares of our common stock for an aggregate purchase price of $0.7 million compared to the repurchase of 683,290 shares for an aggregate purchase price of $72.9 million during the same period in 2015.

Notes, Credit Facilities and Available Future Liquidity

We have two series of senior notes outstanding with an aggregate principal amount of $150 million ("Senior Notes") issued in a private placement transaction. Series A consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.01% and are due in full on September 30, 2021. Series B consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.11% and are due in full on September 30, 2023. Interest on each series of the Senior Notes is payable semi-annually on March 30 and September 30.

We maintain a revolving credit facility ("Credit Facility") that allows for an aggregate borrowing capacity of $400 million. The Credit Facility also provides an option to increase the commitment under the Credit Facility by an additional $50 million to bring the total borrowings available to $450 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.25% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due August 29, 2019, when the Credit Facility matures. Our available capacity at any point in time is reduced by borrowings outstanding at the time and outstanding letters of credit which totaled $25.8 million at March 31, 2016, resulting in an available borrowing capacity under the Credit Facility of $115.2 million. In addition to those items under the Credit Facility, we had $11.1 million of outstanding letters of credit and performance guarantees and bonds from other sources as of March 31, 2016.

The terms of the Credit Facility and Senior Notes require us to meet certain covenants, including, but not limited to, an interest coverage ratio (consolidated EBITDA divided by interest expense) and a leverage ratio (consolidated net indebtedness divided by consolidated EBITDA), where consolidated EBITDA (as defined in each agreement) and interest expense are calculated using the most recent four fiscal quarters. The Credit Facility has the more restrictive covenants with a minimum interest coverage ratio of 3.0 to 1.0 and a maximum leverage ratio of 2.5 to 1.0. We believe that we are in compliance with all such covenants contained in our credit agreements. Certain of our material, wholly-owned subsidiaries are guarantors or co-borrowers under the Credit Facility and Senior Notes.

In 2014, we entered into two interest rate swap agreements for a total notional amount of $50 million. See Note 12 - Derivative Instruments and Hedging Activities.

Our ability to maintain and grow our operating income and cash flow depends, to a large extent, on continued investing activities. We believe our future cash flows from operations, supplemented by our borrowing capacity and issuances of additional equity, should be sufficient to fund our debt requirements, capital expenditures, working capital, dividend payments and future acquisitions.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

There have been no material changes in market risk from the information provided in Item 7A. "Quantitative and Qualitative Disclosures About Market Risk" in our 2015 Annual Report.

Item 4. Controls and Procedures

A complete discussion of our controls and procedures is included in our 2015 Annual Report.

Disclosure Controls and Procedures

Our management, under the supervision of and with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as of the end of the period covered by this report. Our disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed by us in our reports filed or submitted under the Exchange Act is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure and is recorded, processed, summarized and reported within the time periods

22

specified in the rules and forms of the SEC. Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective as of March 31, 2016 at the reasonable assurance level.

Our management does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud. Further, the design of disclosure controls and internal control over financial reporting must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within a company have been detected.

Changes in Internal Control Over Financial Reporting

There have been no changes in our system of internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act, during the fiscal quarter ended March 31, 2016, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

23

CORE LABORATORIES N.V.

PART II - OTHER INFORMATION

Item 1.  Legal Proceedings

See Note 6 to our Consolidated Interim Financial Statements in Part I, Item 1 of this Quarterly Report.

Item 1A.  Risk Factors

Our business faces many risks. Any of the risks discussed in this Quarterly Report or our other SEC filings could have a material impact on our business, financial position or results of operations. Additional risks and uncertainties not presently known to us or that we currently believe to be immaterial may also impair our business operations. For a detailed discussion of the risk factors that should be understood by any investor contemplating investment in our securities, please refer to "Item 1A - Risk Factors" in our 2015 Annual Report.

Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds

Unregistered Sales of Equity Securities

None.

Issuer Repurchases of Equity Securities

The following table provides information about purchases of equity securities that are registered by us pursuant to Section 12 of the Exchange Act during the three months endedMarch 31, 2016:

Period	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of a Publicly Announced Program	Maximum Number of Shares That May Yet be Purchased Under the Program (2)(3)
January 30, 2016 (1)	210	$	108.74	210	2,461,268
February 29, 2016 (1)	75	96.19		75	2,461,573
March 31, 2016 (1)	6,080	109.52		6,080	2,476,694
Total	6,365	$	109.33	6,365

(1) All shares repurchased during the quarter were surrendered to us by participants in a stock-based compensation plan to settle any personal tax liabilities which may result from the award.

(2) In connection with our initial public offering in September 1995, our shareholders authorized our Management Board to repurchase up to 10% of our issued share capital for a period of 18 months. This authorization was renewed at subsequent annual or special shareholder meetings. The repurchase of shares in the open market is at the discretion of management pursuant to this shareholder authorization.

(3) We distributed 22,156 treasury shares upon vesting of stock-based awards during the three months ended March 31, 2016.

24

Item 6.  Exhibits

Exhibit No.		Exhibit Title	Incorporated by reference from the following documents
3.1	-	Articles of Association of Core Laboratories N.V., as amended in 2012 (including English translation)	Exhibit 3.1 filed on February 19, 2013 with 2012 10-K (File No. 001-14273)
31.1	-	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith
31.2	-	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith
32.1	-	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	Furnished herewith
32.2	-	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	Furnished herewith
101.INS	-	XBRL Instance Document	Filed herewith
101.SCH	-	XBRL Schema Document	Filed herewith
101.CAL	-	XBRL Calculation Linkbase Document	Filed herewith
101.LAB	-	XBRL Label Linkbase Document	Filed herewith
101.PRE	-	XBRL Presentation Linkbase Document	Filed herewith
101.DEF	-	XBRL Definition Linkbase Document	Filed herewith

25

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant, Core Laboratories N.V., has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		CORE LABORATORIES N.V.
Date:	April 22, 2016	By:	/s/ Richard L. Bergmark
			Richard L. Bergmark
			Chief Financial Officer
			(Duly Authorized Officer and
			Principal Financial Officer)

26

EX-31.1

Certification

Exhibit 31.1

I, David M. Demshur, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Core Laboratories N.V. (the "Registrant");

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

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

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

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

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

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

Date:	April 22, 2016	By:	/s/ David M. Demshur
			David M. Demshur
			Chief Executive Officer

EX-31.2

Certification

Exhibit 31.2

I, Richard L. Bergmark, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Core Laboratories N.V. (the "Registrant");

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

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

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

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

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

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

Date:	April 22, 2016	By:	/s/ Richard L. Bergmark
			Richard L. Bergmark
			Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of

Chief Executive Officer

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, David M. Demshur, Chief Executive Officer of Core Laboratories N.V. (the "Company"), hereby certify that the accompanying report on Form 10-Q for the quarter ended March 31, 2016, filed by the Company with the Securities and Exchange Commission on the date hereof fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, (the "Report").

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	April 22, 2016	/s/ David M. Demshur
		Name: David M. Demshur
		Title: Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification of

Chief Financial Officer

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Richard L. Bergmark, Chief Financial Officer of Core Laboratories N.V. (the "Company"), hereby certify that the accompanying report on Form 10-Q for the quarter ended March 31, 2016, filed by the Company with the Securities and Exchange Commission on the date hereof fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, (the "Report").

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	April 22, 2016	/s/ Richard L. Bergmark
		Name: Richard L. Bergmark
		Title: Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 21, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	CORE LABORATORIES N V
Entity Central Index Key	0001000229
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,399,183

XML

Consolidated Balance Sheets Statement - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 16,665	$ 22,494
Accounts receivable, net of allowance for doubtful accounts of $3,240 and $4,136 at 2016 and 2015, respectively	122,496	145,689
Inventories	41,702	40,906
Prepaid expenses	12,191	12,053
Income taxes receivable	7,711	7,209
Other current assets	6,645	10,196
TOTAL CURRENT ASSETS	207,410	238,547
PROPERTY, PLANT AND EQUIPMENT, net	138,860	143,211
INTANGIBLES, net	9,857	10,041
GOODWILL	178,159	178,159
DEFERRED TAX ASSETS, net	9,178	11,693
OTHER ASSETS	43,786	43,607
TOTAL ASSETS	587,250	625,258
CURRENT LIABILITIES:
Accounts payable	34,753	33,474
Accrued payroll and related costs	34,756	36,475
Taxes other than payroll and income	7,937	9,495
Unearned revenue	14,272	14,101
Income taxes payable	4,310	1,733
Other current liabilities	12,388	25,480
TOTAL CURRENT LIABILITIES	108,416	120,758
LONG-TERM DEBT, net	407,112	430,987
DEFERRED COMPENSATION	42,598	43,478
DEFERRED TAX LIABILITIES, net	7,983	4,881
OTHER LONG-TERM LIABILITIES	$ 49,123	$ 48,853
COMMITMENTS AND CONTINGENCIES (Note 6)
Preference shares, EUR 0.02 par value; 6,000,000 shares authorized, none issued or outstanding	$ 0	$ 0
Common shares, EUR 0.02 par value; 200,000,000 shares authorized, 44,350,002 issued and 42,391,696 outstanding at 2016 and 44,350,002 issued and 42,375,905 outstanding at 2015	1,142	1,142
Additional paid-in capital	2,356	0
Retained earnings	210,983	219,207
Accumulated other comprehensive income (loss)	(11,330)	(10,538)
Treasury shares (at cost), 1,958,306 at 2016 and 1,974,097 at 2015	(236,533)	(238,875)
Total Core Laboratories N.V. shareholders' equity (deficit)	(33,382)	(29,064)
Non-controlling interest	5,400	5,365
TOTAL EQUITY (DEFICIT)	(27,982)	(23,699)
TOTAL LIABILITIES AND EQUITY (DEFICIT)	$ 587,250	$ 625,258

XML

Consolidated Balance Sheets Balance Sheet Parenthetical $ in Thousands	Mar. 31, 2016 USD ($) shares	Mar. 31, 2016 € / shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2015 € / shares
Allowance for Doubtful Accounts Receivable, Current | $	$ 3,240		$ 4,136
Common Stock, Par or Stated Value Per Share | € / shares		€ 0.02		€ 0.02
Common Stock, Shares Authorized	200,000,000		200,000,000
Common Stock, Shares, Issued	44,350,002		44,350,002
Common Stock, Shares, Outstanding	42,391,696		42,375,905
Treasury Stock, Shares	1,958,306		1,974,097
Preferred Stock, Par or Stated Value Per Share | € / shares		€ 0.02		€ 0.02
Preferred Stock, Shares Authorized	6,000,000		6,000,000
Preferred Stock, Shares Issued	0		0
Preferred Stock, Shares Outstanding	0		0

XML

Consolidated Statements of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUE:
Services	$ 122,770	$ 162,974
Product sales	30,877	50,669
Total revenue	153,647	213,643
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below	85,294	102,795
Cost of product sales, exclusive of depreciation expense shown below	27,520	41,479
General and administrative expense, exclusive of depreciation expense shown below	11,050	12,674
Depreciation	6,627	6,345
Amortization	220	221
Other (income) expense, net	(4)	322
Severance and other charges	0	7,090
OPERATING INCOME	22,940	42,717
Interest expense	3,434	2,403
Income before income tax expense	19,506	40,314
Income tax expense	4,389	9,272
Net income	15,117	31,042
Net income (loss) attributable to non-controlling interest	35	(357)
Net income attributable to Core Laboratories N.V.	$ 15,082	$ 31,399
EARNINGS PER SHARE INFORMATION:
Basic earnings per share attributable to Core Laboratories N.V. (in dollars per share)	$ 0.36	$ 0.72
Diluted earnings per share attributable to Core Laboratories N.V. (in dollars per share)	0.35	0.72
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.55
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic	42,380	43,340
Diluted	42,520	43,466

XML

Consolidated Statement of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 15,117	$ 31,042
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(1,620)	(1,140)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	213	243
Income taxes on derivatives	518	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(889)	(897)
Amortization to net income of transition asset	0	(22)
Amortization to net income of prior service cost	(19)	(19)
Amortization to net income of actuarial loss	148	183
Income taxes on pension and other postretirement benefit plans	(32)	(35)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	97	107
Other Comprehensive Income (Loss), Net of Tax	(792)	(790)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Comprehensive income	14,325	30,252
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	35	(357)
Comprehensive income attributable to Core Laboratories N.V.	$ 14,290	$ 30,609

XML

Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 15,117	$ 31,042
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	5,462	5,208
Depreciation and amortization	6,847	6,566
(Increase) decrease in value of life insurance policies	(568)	(816)
Deferred income taxes	(923)	1,996
Other non-cash items	(1,334)	1,450
Changes in assets and liabilities:
Accounts receivable	23,895	36,884
Inventories	(916)	(5,937)
Prepaid expenses and other current assets	(254)	8,137
Other assets	1,109	1,043
Accounts payable	1,819	1,635
Accrued expenses	(3,222)	(10,515)
Increase (Decrease) in Deferred Revenue	170	3,768
Other long-term liabilities	(1,105)	(932)
Net cash provided by operating activities	46,097	79,529
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(2,858)	(6,869)
Patents and other intangibles	(36)	(186)
Proceeds from sale of assets	408	726
Premiums on life insurance	(532)	(647)
Net cash used in investing activities	(3,018)	(6,976)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(37,838)	(18,000)
Proceeds from debt borrowings	13,000	35,000
Excess tax benefits from stock-based compensation	(68)	(68)
Debt financing costs	0	(125)
Payments of Dividends	(23,306)	(23,940)
Repurchase of common shares	(696)	(69,633)
Net cash used in financing activities	(48,908)	(76,766)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(5,829)	(4,213)
CASH AND CASH EQUIVALENTS, beginning of period	22,494	23,350
CASH AND CASH EQUIVALENTS, end of period	$ 16,665	$ 19,137

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

The accompanying unaudited consolidated financial statements include the accounts of Core Laboratories N.V. and its subsidiaries for which we have a controlling voting interest and/or a controlling financial interest. These financial statements have been prepared in accordance with United States ("U.S.") generally accepted accounting principles ("GAAP") for interim financial information using the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all of the information and footnote disclosures required by U.S. GAAP and should be read in conjunction with the audited financial statements and the summary of significant accounting policies and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015 (the "2015 Annual Report").

Core Laboratories N.V. uses the equity method of accounting for investments in which it has less than a majority interest and over which it does not exercise control but does exert significant influence. We use the cost method to record certain other investments in which we own less than 20% of the outstanding equity and do not exercise control or exert significant influence. Non-controlling interests have been recorded to reflect outside ownership attributable to consolidated subsidiaries that are less than 100% owned. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included in these financial statements. Furthermore, the operating results presented for the three months ended March 31, 2016 may not necessarily be indicative of the results that may be expected for the year ending December 31, 2016.

Core Laboratories N.V.'s balance sheet information for the year ended December 31, 2015 was derived from the 2015 audited consolidated financial statements but does not include all disclosures in accordance with U.S. GAAP.

Certain reclassifications were made to prior period amounts in order to conform to the current period presentation. These reclassifications had no impact on the reported net income or cash flows for the three months ended March 31, 2015.

References to "Core Lab", the "Company", "we", "our" and similar phrases are used throughout this Quarterly Report on Form 10-Q and relate collectively to Core Laboratories N.V. and its consolidated subsidiaries.

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Inventories

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following (in thousands):

	March 31, 2016		December 31, 2015
Finished goods	$	27,285	$	25,778
Parts and materials	12,693		12,637
Work in progress	1,724		2,491
Total inventories	$	41,702	$	40,906

We include freight costs incurred for shipping inventory to customers in the Cost of product sales line of the Consolidated Statements of Operations.

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Acquisitions (Notes)

3 Months Ended

Mar. 31, 2016

Acquisitions [Abstract]

Mergers, Acquisitions and Dispositions Disclosures [Text Block]

In the second quarter of 2015, we acquired a business providing additional reservoir fluids technology for $17.2 million in cash. We accounted for this acquisition by allocating the purchase price to the net assets acquired based on their estimated fair values at the date of acquisition, resulting in an increase to goodwill of $13.7 million and an increase of $2.0 million in intangible assets. The acquisition of this entity did not have a material impact on our Consolidated Balance Sheet or Consolidated Statements of Operations, and was recorded in the Reservoir Description business segment.

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Debt and Capital Lease Obligations

3 Months Ended

Mar. 31, 2016

Debt and Capital Lease Obligations [Abstract]

Debt and Capital Lease Obligations

We have no capital lease obligations. Long-term debt is summarized in the following table (in thousands):

	March 31, 2016			December 31, 2015
Senior notes	$	150,000		$	150,000
Credit facility	259,000			283,000
Other indebtedness	1,406			2,244
Total debt	410,406			435,244
Less: Short-term debt included in other indebtedness	(1,406		)	(2,244		)
Less: Debt issuance costs	(1,888		)	(2,013		)
Long-term debt, net	$	407,112		$	430,987

We have two series of senior notes outstanding with an aggregate principal amount of $150 million ("Senior Notes") issued in a private placement transaction. Series A consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.01% and are due in full on September 30, 2021. Series B consists of $75 million in aggregate principal amount of notes that bear interest at a fixed rate of 4.11% and are due in full on September 30, 2023. Interest on each series of the Senior Notes is payable semi-annually on March 30 and September 30.

We maintain a revolving credit facility ("Credit Facility") that allows for an aggregate borrowing capacity of $400 million. The Credit Facility also provides an option to increase the commitment under the Credit Facility by an additional $50 million to bring the total borrowings available to $450 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.25% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due August 29, 2019, when the Credit Facility matures. Our available capacity at any point in time is reduced by borrowings outstanding at the time and outstanding letters of credit which totaled $25.8 million at March 31, 2016, resulting in an available borrowing capacity under the Credit Facility of $115.2 million. In addition to those items under the Credit Facility, we had $11.1 million of outstanding letters of credit and performance guarantees and bonds from other sources as of March 31, 2016.

The terms of the Credit Facility and Senior Notes require us to meet certain covenants, including, but not limited to, an interest coverage ratio (consolidated EBITDA divided by interest expense) and a leverage ratio (consolidated net indebtedness divided by consolidated EBITDA), where consolidated EBITDA (as defined in each agreement) and interest expense are calculated using the most recent four fiscal quarters. The Credit Facility has the more restrictive covenants with a minimum interest coverage ratio of 3.0 to 1.0 and a maximum leverage ratio of 2.5 to 1.0. We believe that we are in compliance with all such covenants contained in our credit agreements. Certain of our material, wholly-owned subsidiaries are guarantors or co-borrowers under the Credit Facility and Senior Notes.

In 2014, we entered into two interest rate swap agreements for a total notional amount of $50 million. See Note 12 - Derivative Instruments and Hedging Activities.

The estimated fair value of total debt at March 31, 2016 and December 31, 2015 approximated the book value of total debt. The fair value was estimated using Level 2 inputs by calculating the sum of the discounted future interest and principal payments through the date of maturity.

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Pensions and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Pensions and Other Postretirement Benefits

Defined Benefit Plan

We provide a non-contributory defined benefit pension plan for substantially all of our Dutch employees ("Dutch Plan") who were hired prior to 2007. The pension benefit is based on years of service and final pay or career average pay, depending on when the employee began participating. The benefits earned by the employees are immediately vested.

The following table summarizes the components of net periodic pension cost under the Dutch Plan for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Service cost	$	358		$	463
Interest cost	327			309
Expected return on plan assets	(275		)	(256		)
Amortization of transition asset	—			(22		)
Amortization of prior service cost	(19		)	(19		)
Amortization of actuarial loss	148			183
Net periodic pension cost	$	539		$	658

During the three months ended March 31, 2016, we contributed approximately $1.0 million to fund the estimated 2016 premiums on investment contracts held by the Dutch Plan.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

We have been and may from time to time be named as a defendant in legal actions that arise in the ordinary course of business. These include, but are not limited to, employment-related claims and contractual disputes or claims for personal injury or property damage which occur in connection with the provision of our services and products. Management does not currently believe that any of our pending contractual, employment-related, personal injury or property damage claims and disputes will have a material effect on our future results of operations, financial position or cash flow.

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Equity

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Equity

During the three months ended March 31, 2016, we repurchased 6,365 of our common shares for $0.7 million. These consisted of rights to shares that were surrendered to us pursuant to the terms of a stock-based compensation plan in consideration of the participants' tax burdens that may result from the issuance of common shares under that plan. Such common shares, unless canceled, may be reissued for a variety of purposes such as future acquisitions, non-employee director stock awards or employee stock awards. We distributed 22,156 treasury shares upon vesting of stock-based awards during the three months ended March 31, 2016.

In February 2016, we paid a quarterly dividend of $0.55 per share of common stock. In addition, on April 14, 2016, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on May 4, 2016 and payable on May 24, 2016.

The following table summarizes our changes in equity for the three months ended March 31, 2016 (in thousands):

	Common Shares		Additional Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity (Deficit)
December 31, 2015	$	1,142	$	—		$	219,207		$	(10,538	)	$	(238,875	)	$	5,365	$	(23,699	)
Stock based-awards	—		2,424			—			—			3,038			—		5,462
Tax benefit of stock-based awards issued	—		(68		)	—			—			—			—		(68		)
Repurchase of common shares	—		—			—			—			(696		)	—		(696		)
Dividends paid	—		—			(23,306		)	—			—			—		(23,306		)
Amortization of deferred pension costs, net of tax	—		—			—			97			—			—		97
Interest rate swaps, net of tax	—		—			—			(889		)	—			—		(889		)
Net income	—		—			15,082			—			—			35		15,117
March 31, 2016	$	1,142	$	2,356		$	210,983		$	(11,330	)	$	(236,533	)	$	5,400	$	(27,982	)

Accumulated other comprehensive income (loss) consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
Transition asset	$	—		$	—
Prior service cost	647			661
Unrecognized net actuarial loss	(10,090		)	(10,201		)
Fair value of derivatives, net of tax	(1,887		)	(998		)
Total accumulated other comprehensive income (loss)	$	(11,330	)	$	(10,538	)

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Earnings per Share

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings per Share

We compute basic earnings per common share by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common and potential common shares include additional shares in the weighted average share calculations associated with the incremental effect of dilutive restricted stock awards and contingently issuable shares, as determined using the treasury stock method. The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average basic common shares outstanding	42,380	43,340
Effect of dilutive securities:
Performance shares	83	64
Restricted stock	57	62
Weighted average diluted common and potential common shares outstanding	42,520	43,466

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Other (Income) Expense, Net

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

The components of other (income) expense, net, were as follows (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Sale of assets	$	(366	)	$	(135	)
Results of non-consolidated subsidiaries	(188		)	(44		)
Foreign exchange	779			840
Rents and royalties	(101		)	(136		)
Other, net	(128		)	(203		)
Total other (income) expense, net	$	(4	)	$	322

Foreign exchange (gain) loss, net by currency is summarized in the following table (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Australian Dollar	125			119
British Pound	228			374
Canadian Dollar	(1		)	1,274
Euro	210			(1,055		)
Other currencies, net	217			128
Total (gain) loss, net	$	779		$	840

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Income Tax Expense

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Income Tax Expense

The effective tax rates for the three months ended March 31, 2016 and 2015 were 22.5% and 23.0%, respectively. Income tax expense of $4.4 million in the first quarter of 2016decreased by $4.9 million compared to $9.3 million in the same period in 2015, primarily in the United States as taxable income recognized in the United States decreased by $15.1 million in 2016 compared to 2015. No other jurisdiction in which we operate had a material change in income tax expense.

Subsequent to March 31, 2016, our U.S. subsidiaries settled an audit covering the years 2010 through 2012 with the Internal Revenue Service that will result in the release of reserves for uncertain tax positions in the amount of $0.9 million in the second quarter of 2016.

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Severance and Other Charges (Notes)

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

11.  SEVERANCE AND OTHER CHARGES

In 2015, in response to reduced spending by our clients on their oil and gas fields as a result of lower commodity prices for crude oil and natural gas, we reduced our cost structure, primarily through a reduction in our workforce, to better align with the decreasing activity levels into the foreseeable future. As a result of these cost reductions, in 2015, we recorded severance charges of $8.8 million, of which $6.4 million was recorded in the first quarter of 2015. Approximately $2.4 million was accrued and remaining to be paid at March 31, 2016.

During the first quarter of 2016, we continued to closely monitor rig counts, crude oil and natural gas prices, and activity levels within the industry. We continued to execute our cost reduction initiative which began in the first quarter of 2015, but no additional expenses associated with severance or asset impairments were recorded during the first quarter of 2016.

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Derivative Instruments (Notes)

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

12.  DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

We are exposed to market risks related to fluctuations in interest rates. To mitigate these risks, we utilize derivative instruments in the form of interest rate swaps. We do not enter into derivative transactions for speculative purposes.

Interest Rate Risk

Our Credit Facility bears interest at variable rates from LIBOR plus 1.25% to a maximum of LIBOR plus 2.00%. We are subject to interest rate risk on the debt carried through our Credit Facility.

In 2014, we entered into two interest rate swap agreements for a total notional amount of $50 million to hedge changes in the variable rate interest expense on $50 million of our existing or replacement LIBOR-priced debt. Under the first swap agreement of $25 million, we have fixed the LIBOR portion of the interest rate at 1.73% through August 29, 2019, and under the second swap agreement of $25 million, we have fixed the LIBOR portion of the interest rate at 2.5% through August 29, 2024. Each swap is measured at fair value and recorded in our Consolidated Balance Sheet as a liability. They are designated and qualify as cash flow hedging instruments and are highly effective. Unrealized losses are deferred to shareholders' equity as a component of accumulated other comprehensive loss (AOCL) and are recognized in income as an increase to interest expense in the period

in which the related cash flows being hedged are recognized in expense.

At March 31, 2016, we had fixed rate long-term debt aggregating $200 million and variable rate long-term debt aggregating $209 million, after taking into account the effect of the swaps.

The fair values of outstanding derivative instruments are as follows:

	Fair Value of Derivatives
	March 31, 2016		December 31, 2015		Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	754	$	353	Other long-term liabilities
10 year interest rate swap	2,235		1,229		Other long-term liabilities
	$	2,989	$	1,582

The fair value of all outstanding derivatives was determined using a model with inputs that are observable in the market (Level 2) or can be derived from or corroborated by observable data.

The effect of the interest rate swaps on the Consolidated Statement of Operations was as follows:

	Three Months Ended
	March 31, 2016		March 31, 2015		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	82	$	97	Increase to interest expense
10 year interest rate swap	131		146		Increase to interest expense
	$	213	$	243

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Financial Instruments (Notes)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

13.  FINANCIAL INSTRUMENTS

The Company's only financial assets and liabilities which involve fair value measures relate to certain aspects of the Company's benefit plans and our derivative instruments. We use the market approach to value certain assets and liabilities at fair value using significant other observable inputs (Level 2) with the assistance of a third party specialist. We do not have any assets or liabilities measured at fair value on a recurring basis using quoted prices in an active market (Level 1) or significant unobservable inputs (Level 3). Gains and losses related to the fair value changes in the deferred compensation assets and liabilities are recorded in General and administrative expense in the Consolidated Statements of Operations. Gains and losses related to the fair value of the interest rate swaps are recorded in Other comprehensive income (loss). The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			March 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	22,582	$	—	$	22,582	$	—
Liabilities:
Deferred compensation plan	$	27,967	$	—	$	27,967	$	—
5 year interest rate swap	754		—		754		—
10 year interest rate swap	2,235		—		2,235		—
	$	30,956	$	—	$	30,956	$	—

			Fair Value Measurement at
			December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	23,737	$	—	$	23,737	$	—
Liabilities:
Deferred compensation plan	$	29,155	$	—	$	29,155	$	—
5 year interest rate swap	353		—		353		—
10 year interest rate swap	1,229		—		1,229		—
	$	30,737	$	—	$	30,737	$	—
(1) Trust assets consist of the cash surrender value of life insurance policies intended to assist in the funding of the deferred compensation plan and are included in Other assets in the Balance Sheet.

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Segment Reporting

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Reporting

We operate our business in three reportable segments.  These complementary segments provide different services and products and utilize different technologies for improving reservoir performance and increasing oil and gas recovery from new and existing fields.

• Reservoir Description: Encompasses the characterization of petroleum reservoir rock, fluid and gas samples. We provide analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry.

• Production Enhancement: Includes services and products relating to reservoir well completions, perforations, stimulations and production. We provide integrated services to evaluate the effectiveness of well completions and to develop solutions aimed at increasing the effectiveness of enhanced oil recovery projects.

• Reservoir Management: Combines and integrates information from reservoir description and production enhancement services to increase production and improve recovery of oil and gas from our clients' reservoirs.

Results for these segments are presented below. We use the same accounting policies to prepare our segment results as are used to prepare our Consolidated Financial Statements. All interest and other non-operating income (expense) is attributable to Corporate & Other and is not allocated to specific segments. Summarized financial information concerning our segments is shown in the following table (in thousands):

	Reservoir Description		Production Enhancement		Reservoir Management		Corporate & Other 1			Consolidated
Three Months Ended March 31, 2016
Revenue from unaffiliated clients	$	101,549	$	44,145	$	7,953	$	—		$	153,647
Inter-segment revenue	1,907		220		5		(2,132		)	—
Segment operating income (loss)	18,220		4,141		487		92			22,940
Total assets (at end of period)	316,705		202,470		19,282		48,793			587,250
Capital expenditures	2,074		378		8		398			2,858
Depreciation and amortization	4,436		1,425		363		623			6,847
Three Months Ended March 31, 2015
Revenue from unaffiliated clients	$	121,759	$	75,145	$	16,739	$	—		$	213,643
Inter-segment revenue	2,776		717		149		(3,642		)	—
Segment operating income (loss)	28,530		9,923		3,866		398			42,717
Total assets (at end of period)	312,129		233,414		29,505		54,960			630,008
Capital expenditures	4,437		1,803		221		408			6,869
Depreciation and amortization	3,783		1,761		431		591			6,566

(1) "Corporate & Other" represents those items that are not directly related to a particular segment and eliminations.

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Recent Accounting Pronouncements

3 Months Ended

Mar. 31, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-02 ("Amendments to the Consolidation Analysis") which amends the guidelines for determining whether certain legal entities should be consolidated. This update eliminates the presumption that a general partner should consolidate a limited partnership and modifies the evaluation of whether limited partnerships are variable interest entities or voting interest entities. Overall, the amendments in this Update are an improvement to current GAAP because they simplify the Codification and reduce the number of consolidation models through the elimination of the indefinite deferral of Statement 167 and because they place more emphasis on risk of loss when determining a controlling financial interest. This update is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. We adopted this standard on January 1, 2016. The adoption of this standard had no effect on our current consolidated financial statements or on the entities that we consolidate.

In November 2015, the FASB issued ASU 2015-17 ("Balance Sheet Classification of Deferred Taxes") to simplify the presentation of deferred income taxes. The amendments in this update require that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. This pronouncement is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. We early adopted this standard for our fiscal year beginning on January 1, 2016 and applied the adoption prospectively. The adoption of this standard had no effect on our current Consolidated Statements of Operations and Consolidated Statement of Cash Flows but had an immaterial effect on our Consolidated Balance Sheet with the reclassification of certain deferred tax balance sheet accounts. The comparative prior period Consolidated Balance Sheet as of December 31, 2015 was not retrospectively adjusted.

In May 2014, the FASB issued ASU 2014-09 ("Revenue from Contracts with Customers"), which provides guidance on revenue recognition. The core principle of this guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance requires entities to apply a five-step method to (1) identify the contract(s) with customers; (2) identify the performance obligation(s) in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligation(s) in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017 (on July 9, 2015, the FASB deferred the implementation date for one year). We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11 ("Simplifying the Measurement of Inventory") to require the measurement of inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This pronouncement is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02 ("Leases"), which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The new standard establishes a right-of-use ("ROU") model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. The new standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years with early adoption permitted. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09 ("Improvements to Employee Share-Based Payment Accounting") which simplifies several aspects of accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new standard is effective for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years with early adoption permitted. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

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Inventories (Tables)

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	March 31, 2016		December 31, 2015
Finished goods	$	27,285	$	25,778
Parts and materials	12,693		12,637
Work in progress	1,724		2,491
Total inventories	$	41,702	$	40,906

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Debt and Capital Lease Obligations (Tables)

3 Months Ended

Mar. 31, 2016

Debt and Capital Lease Obligations [Abstract]

Schedule of Long-term Debt Instruments

debt is summarized in the following table (in thousands):

	March 31, 2016			December 31, 2015
Senior notes	$	150,000		$	150,000
Credit facility	259,000			283,000
Other indebtedness	1,406			2,244
Total debt	410,406			435,244
Less: Short-term debt included in other indebtedness	(1,406		)	(2,244		)
Less: Debt issuance costs	(1,888		)	(2,013		)
Long-term debt, net	$	407,112		$	430,987

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Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

The following table summarizes the components of net periodic pension cost under the Dutch Plan for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Service cost	$	358		$	463
Interest cost	327			309
Expected return on plan assets	(275		)	(256		)
Amortization of transition asset	—			(22		)
Amortization of prior service cost	(19		)	(19		)
Amortization of actuarial loss	148			183
Net periodic pension cost	$	539		$	658

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Equity (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Schedule of Stockholders Equity

The following table summarizes our changes in equity for the three months ended March 31, 2016 (in thousands):

	Common Shares		Additional Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity (Deficit)
December 31, 2015	$	1,142	$	—		$	219,207		$	(10,538	)	$	(238,875	)	$	5,365	$	(23,699	)
Stock based-awards	—		2,424			—			—			3,038			—		5,462
Tax benefit of stock-based awards issued	—		(68		)	—			—			—			—		(68		)
Repurchase of common shares	—		—			—			—			(696		)	—		(696		)
Dividends paid	—		—			(23,306		)	—			—			—		(23,306		)
Amortization of deferred pension costs, net of tax	—		—			—			97			—			—		97
Interest rate swaps, net of tax	—		—			—			(889		)	—			—		(889		)
Net income	—		—			15,082			—			—			35		15,117
March 31, 2016	$	1,142	$	2,356		$	210,983		$	(11,330	)	$	(236,533	)	$	5,400	$	(27,982	)

Schedule of Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
Transition asset	$	—		$	—
Prior service cost	647			661
Unrecognized net actuarial loss	(10,090		)	(10,201		)
Fair value of derivatives, net of tax	(1,887		)	(998		)
Total accumulated other comprehensive income (loss)	$	(11,330	)	$	(10,538	)

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average basic common shares outstanding	42,380	43,340
Effect of dilutive securities:
Performance shares	83	64
Restricted stock	57	62
Weighted average diluted common and potential common shares outstanding	42,520	43,466

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Other (Income) Expense, Net (Tables)

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Foreign Currency Gains Losses By Currency

Foreign exchange (gain) loss, net by currency is summarized in the following table (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Australian Dollar	125			119
British Pound	228			374
Canadian Dollar	(1		)	1,274
Euro	210			(1,055		)
Other currencies, net	217			128
Total (gain) loss, net	$	779		$	840

Schedule of Other Operating Cost and Expense, by Component

The components of other (income) expense, net, were as follows (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Sale of assets	$	(366	)	$	(135	)
Results of non-consolidated subsidiaries	(188		)	(44		)
Foreign exchange	779			840
Rents and royalties	(101		)	(136		)
Other, net	(128		)	(203		)
Total other (income) expense, net	$	(4	)	$	322

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2016

Derivatives, Fair Value [Line Items]

Schedule of Derivative Liabilities at Fair Value [Table Text Block]

The fair values of outstanding derivative instruments are as follows:

	Fair Value of Derivatives
	March 31, 2016		December 31, 2015		Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	754	$	353	Other long-term liabilities
10 year interest rate swap	2,235		1,229		Other long-term liabilities
	$	2,989	$	1,582

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Derivative Instruments Derivative Instruments Gain Loss Table (Tables)

3 Months Ended

Mar. 31, 2016

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) [Table Text Block]

The effect of the interest rate swaps on the Consolidated Statement of Operations was as follows:

	Three Months Ended
	March 31, 2016		March 31, 2015		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	82	$	97	Increase to interest expense
10 year interest rate swap	131		146		Increase to interest expense
	$	213	$	243

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Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements [Table Text Block]

			Fair Value Measurement at
			March 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	22,582	$	—	$	22,582	$	—
Liabilities:
Deferred compensation plan	$	27,967	$	—	$	27,967	$	—
5 year interest rate swap	754		—		754		—
10 year interest rate swap	2,235		—		2,235		—
	$	30,956	$	—	$	30,956	$	—

			Fair Value Measurement at
			December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation trust assets (1)	$	23,737	$	—	$	23,737	$	—
Liabilities:
Deferred compensation plan	$	29,155	$	—	$	29,155	$	—
5 year interest rate swap	353		—		353		—
10 year interest rate swap	1,229		—		1,229		—
	$	30,737	$	—	$	30,737	$	—
(1) Trust assets consist of the cash surrender value of life insurance policies intended to assist in the funding of the deferred compensation plan and are included in Other assets in the Balance Sheet.

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Summarized financial information concerning our segments is shown in the following table (in thousands):

	Reservoir Description		Production Enhancement		Reservoir Management		Corporate & Other 1			Consolidated
Three Months Ended March 31, 2016
Revenue from unaffiliated clients	$	101,549	$	44,145	$	7,953	$	—		$	153,647
Inter-segment revenue	1,907		220		5		(2,132		)	—
Segment operating income (loss)	18,220		4,141		487		92			22,940
Total assets (at end of period)	316,705		202,470		19,282		48,793			587,250
Capital expenditures	2,074		378		8		398			2,858
Depreciation and amortization	4,436		1,425		363		623			6,847
Three Months Ended March 31, 2015
Revenue from unaffiliated clients	$	121,759	$	75,145	$	16,739	$	—		$	213,643
Inter-segment revenue	2,776		717		149		(3,642		)	—
Segment operating income (loss)	28,530		9,923		3,866		398			42,717
Total assets (at end of period)	312,129		233,414		29,505		54,960			630,008
Capital expenditures	4,437		1,803		221		408			6,869
Depreciation and amortization	3,783		1,761		431		591			6,566

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Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt issuance costs [Domain]
Debt Instrument [Line Items]
Debt acquisition costs	$ (1,888)	$ (2,013)

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Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 27,285	$ 25,778
Parts and materials	12,693	12,637
Work in progress	1,724	2,491
Total inventories	$ 41,702	$ 40,906

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Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 400,000
Line of Credit Facility, Extension Capacity	50,000
Line of credit facility, maximum borrowing capacity	450,000
Performance bonds under credit facility	25,800
Line of credit facility, remaining borrowing capacity	115,200
Performance bonds	11,100
Long-term Debt, Excluding Current Maturities	407,112	$ 430,987
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	150,000	150,000
Face amount	150,000
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 259,000	283,000
Maturity date	Aug. 29, 2019
Senior Notes Series A [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.01%
Face amount	$ 75,000
Maturity date	Sep. 30, 2021
Senior Notes Series B [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.11%
Face amount	$ 75,000
Maturity date	Sep. 30, 2023
Short-term Debt [Member]
Debt Instrument [Line Items]
Debt, Current	$ 1,406	2,244
Total debt [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	410,406	435,244
Debt issuance costs [Domain]
Debt Instrument [Line Items]
Debt acquisition costs	$ (1,888)	$ (2,013)
Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	1.25%
Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	2.00%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 50,000

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Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 358	$ 463
Interest cost	327	309
Expected return on plan assets	(275)	(256)
Amortization of transition asset	0	22
Amortization of prior service cost	19	19
Amortization of actuarial loss	148	183
Net periodic pension cost	539	$ 658
Contributions by employer	$ 1,000

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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Treasury sock, shares, acquired	6,365
Treasury stock, value, acquired	$ 0.7
Stock Issued During Period, Shares, Treasury Stock Reissued	22,156
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.55
Dividends declared (in dollars per share)	$ 0.55

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Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (23,699)
Stock based-awards	5,462
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(68)
Repurchase of common shares	(696)
Dividends paid	(23,306)
Amortization of deferred pension costs, net of tax	97
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(889)	$ (897)
Net income	15,117	$ 31,042
Ending balance	(27,982)
Common Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,142
Stock based-awards	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	0
Repurchase of common shares	0
Dividends paid	0
Amortization of deferred pension costs, net of tax	0
Net income	0
Ending balance	1,142
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0
Stock based-awards	2,424
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(68)
Repurchase of common shares	0
Dividends paid	0
Amortization of deferred pension costs, net of tax	0
Net income	0
Ending balance	2,356
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	219,207
Stock based-awards	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	0
Repurchase of common shares	0
Dividends paid	(23,306)
Amortization of deferred pension costs, net of tax	0
Net income	15,082
Ending balance	210,983
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(10,538)
Stock based-awards	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	0
Repurchase of common shares	0
Dividends paid	0
Amortization of deferred pension costs, net of tax	97
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(889)
Net income	0
Ending balance	(11,330)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(238,875)
Stock based-awards	3,038
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	0
Repurchase of common shares	(696)
Dividends paid	0
Amortization of deferred pension costs, net of tax	0
Net income	0
Ending balance	(236,533)
Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,365
Stock based-awards	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	0
Repurchase of common shares	0
Dividends paid	0
Amortization of deferred pension costs, net of tax	0
Net income	35
Ending balance	$ 5,400

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Equity (Comprehensive Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Prior service cost	$ 647	$ 661
Transition asset	0	0
Unrecognized net actuarial loss	(10,090)	(10,201)
Derivative, Fair Value, Net	(1,887)	(998)
Total accumulated other comprehensive income (loss)	$ (11,330)	$ (10,538)

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Earnings per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding	42,380	43,340
Performance shares (in shares)	83	64
Restricted stock (in shares)	57	62
Weighted average diluted common and potential common shares outstanding	42,520	43,466

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Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Income and Expenses [Abstract]
Sale of assets	$ (366)	$ (135)
Results of non-consolidated subsidiaries	(188)	(44)
Foreign exchange	779	840
Rents and royalties	(101)	(136)
Other, net	(128)	(203)
Total other (income) expense, net	$ (4)	$ 322

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Other (Income) Expense, Net (Foreign Currency (Gain ) Loss by Currency) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Foreign exchange	$ 779	$ 840
AustralianDollar [Member]
Foreign exchange	125	119
British Pound [Member]
Foreign exchange	228	374
Canadian Dollar [Member]
Foreign exchange	(1)	1,274
Euro [Member]
Foreign exchange	210	(1,055)
Other Currencies Net [Member]
Foreign exchange	$ 217	$ 128

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Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015
Income Tax Contingency [Line Items]
Change in income tax expense - U.S.		$ (15.1)
Change in income tax expense		$ (4.9)
Effective income tax rate		22.50%	23.00%
Release of reserves for uncertain tax positions	$ 0.9

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Severance and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Other Income and Expenses [Abstract]
Severance charges			$ (8,800)
Severance recorded in comparative quarter		$ 6,400
Severance and other charges	$ 0	$ 7,090
Accrued severance charges	$ 2,400

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Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 2,989	$ 1,582
Derivative, Notional Amount	50,000
Interest Rate Swap No. 1 [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2,235	1,229
Derivative, Notional Amount	$ 25,000
Derivative, Fixed Interest Rate	2.50%
Derivative, Maturity Date	Aug. 29, 2024
Interest Rate Swap No. 2 [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 754	$ 353
Derivative, Notional Amount	$ 25,000
Derivative, Fixed Interest Rate	1.73%
Derivative, Maturity Date	Aug. 29, 2019
Minimum [Member]
Derivatives, Fair Value [Line Items]
Basis Spread on Variable Rate	1.25%
Maximum [Member]
Derivatives, Fair Value [Line Items]
Basis Spread on Variable Rate	2.00%

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Derivative Instruments Long-term debt (Details) $ in Millions	Mar. 31, 2016 USD ($)
Debt Disclosure in Derivatives Footnote [Abstract]
Long-term Debt, Percentage Bearing Variable Interest, Amount	$ 209
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 200

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Derivative Instruments Derivative gain loss table (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 213	$ 243
Interest Rate Swap No. 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	131	146
Interest Rate Swap No. 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 82	$ 97

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Financial Instruments FInancial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 22,582	$ 23,737
Deferred Compensation Liability, Current and Noncurrent	27,967	29,155
Financial and Nonfinancial Liabilities, Fair Value Disclosure	30,956	30,737
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	22,582	23,737
Deferred Compensation Liability, Current and Noncurrent	27,967	29,155
Financial and Nonfinancial Liabilities, Fair Value Disclosure	30,956	30,737
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Interest Rate Swap No. 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	754	353
Interest Rate Swap No. 2 [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0	0
Interest Rate Swap No. 2 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	754	353
Interest Rate Swap No. 2 [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0	0
Interest Rate Swap No. 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2,235	1,229
Interest Rate Swap No. 1 [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0	0
Interest Rate Swap No. 1 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	2,235	1,229
Interest Rate Swap No. 1 [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 0	$ 0

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 153,647	$ 213,643
Inter-segment revenue	0	0
Segment operating income (loss)	22,940	42,717
Total assets (at end of period)	587,250	630,008	$ 625,258
Capital expenditures	2,858	6,869
Depreciation and amortization	6,847	6,566
Operating Segments [Member] | Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	101,549	121,759
Inter-segment revenue	1,907	2,776
Segment operating income (loss)	18,220	28,530
Total assets (at end of period)	316,705	312,129
Capital expenditures	2,074	4,437
Depreciation and amortization	4,436	3,783
Operating Segments [Member] | Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	44,145	75,145
Inter-segment revenue	220	717
Segment operating income (loss)	4,141	9,923
Total assets (at end of period)	202,470	233,414
Capital expenditures	378	1,803
Depreciation and amortization	1,425	1,761
Operating Segments [Member] | Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	7,953	16,739
Inter-segment revenue	5	149
Segment operating income (loss)	487	3,866
Total assets (at end of period)	19,282	29,505
Capital expenditures	8	221
Depreciation and amortization	363	431
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0
Inter-segment revenue	(2,132)	(3,642)
Segment operating income (loss)	92	398
Total assets (at end of period)	48,793	54,960
Capital expenditures	398	408
Depreciation and amortization	$ 623	$ 591