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 June 30, 2018
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, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   o

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 July 25, 2018 was 44,212,840.

CORE LABORATORIES N.V.
FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2018
INDEX
PART I - FINANCIAL INFORMATION
		Page
Item 1.	Financial Statements
	Consolidated Balance Sheets (Unaudited) at June 30, 2018 and December 31, 2017	1
	Consolidated Statements of Operations (Unaudited) for the Three Months Ended June 30, 2018 and 2017	2
	Consolidated Statements of Operations (Unaudited) for the Six Months Ended June 30, 2018 and 2017	3
	Consolidated Statements of Comprehensive Income (Unaudited) for the Three and Six Months Ended June 30, 2018 and 2017	4
	Consolidated Statements of Cash Flows (Unaudited) for the Six Months Ended June 30, 2018 and 2017	5
	Notes to the Unaudited Consolidated Interim Financial Statements	6
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	28
Item 4.	Controls and Procedures	28
PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	30
Item 1A.	Risk Factors	30
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	30
Item 6.	Exhibits	31
	Signature	32

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

CORE LABORATORIES N.V.

CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share data)

	June 30, 2018			December 31, 2017
ASSETS	(Unaudited)
CURRENT ASSETS:
Cash and cash equivalents	$	13,021		$	14,400
Accounts receivable, net of allowance for doubtful accounts of $2,474 and $2,590 at 2018 and 2017, respectively	136,148			133,097
Inventories	39,855			33,317
Prepaid expenses	13,967			12,592
Income taxes receivable	11,899			7,508
Other current assets	10,772			6,513
TOTAL CURRENT ASSETS	225,662			207,427
PROPERTY, PLANT AND EQUIPMENT, net	122,787			123,098
INTANGIBLES, net	9,786			9,396
GOODWILL	178,129			179,044
DEFERRED TAX ASSETS	11,498			10,719
OTHER ASSETS	56,882			55,128
TOTAL ASSETS	$	604,744		$	584,812
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	45,278		$	41,697
Accrued payroll and related costs	21,427			28,887
Taxes other than payroll and income	6,986			7,313
Unearned revenue	12,608			12,627
Income taxes payable	1,167			825
Other current liabilities	13,125			9,227
TOTAL CURRENT LIABILITIES	100,591			100,576
LONG-TERM DEBT, net	241,687			226,989
CONTRACT LIABILITIES	4,664			4,442
DEFERRED COMPENSATION	54,634			52,786
DEFERRED TAX LIABILITIES	6,471			5,323
OTHER LONG-TERM LIABILITIES	38,923			45,964
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
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, 44,796,252 issued and 44,203,536 outstanding at 2018 and 44,796,252 issued and 44,184,205 outstanding at 2017	1,148			1,148
Additional paid-in capital	58,927			54,463
Retained earnings	173,499			173,855
Accumulated other comprehensive income (loss)	(7,490		)	(8,353		)
Treasury shares (at cost), 592,716 at 2018 and 612,047 at 2017	(72,301		)	(76,269		)
Total Core Laboratories N.V. shareholders' equity	153,783			144,844
Non-controlling interest	3,991			3,888
TOTAL EQUITY	157,774			148,732
TOTAL LIABILITIES AND EQUITY	$	604,744		$	584,812

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
	June 30,
	2018			2017
	(Unaudited)
REVENUE:
Services	$	122,094		$	116,940
Product sales	53,381			41,272
Total revenue	175,475			158,212
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below	86,759			80,368
Cost of product sales, exclusive of depreciation expense shown below	37,014			33,267
General and administrative expense, exclusive of depreciation expense shown below	12,202			11,100
Depreciation	5,628			5,979
Amortization	240			209
Other (income) expense, net	183			(66		)
OPERATING INCOME	33,449			27,355
Interest expense	3,296			2,692
Income from continuing operations before income tax expense	30,153			24,663
Income tax expense	5,020			3,709
Income from continuing operations	25,133			20,954
Income (loss) from discontinued operations, net of income taxes	(328		)	1,755
Net Income	24,805			22,709
Net income attributable to non-controlling interest	53			19
Net income attributable to Core Laboratories N.V.	$	24,752		$	22,690
EARNINGS (LOSS) PER SHARE INFORMATION:
Basic earnings per share from continuing operations	$	0.57		$	0.47
Basic earnings (loss) per share from discontinued operations	$	(0.01	)	$	0.04
Basic earnings per share attributable to Core Laboratories N.V.	$	0.56		$	0.51
Diluted earnings per share from continuing operations	$	0.57		$	0.47
Diluted earnings (loss) per share from discontinued operations	$	(0.01	)	$	0.04
Diluted earnings per share attributable to Core Laboratories N.V.	$	0.56		$	0.51
Cash dividends per share	$	0.55		$	0.55
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic	44,203			44,164
Diluted	44,493			44,374

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

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CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

	Six Months Ended
	June 30,
	2018			2017
	(Unaudited)
REVENUE:
Services	$	241,880		$	237,542
Product sales	103,613			77,279
Total revenue	345,493			314,821
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below	170,047			163,642
Cost of product sales, exclusive of depreciation expense shown below	73,044			63,013
General and administrative expense, exclusive of depreciation expense shown below	24,911			23,856
Depreciation	11,210			12,059
Amortization	476			434
Other (income) expense, net	40			923
OPERATING INCOME	65,765			50,894
Interest expense	6,416			5,310
Income from continuing operations before income tax expense	59,349			45,584
Income tax expense	10,293			6,638
Income from continuing operations	49,056			38,946
Income (loss) from discontinued operations, net of income taxes	(674		)	1,445
Net Income	48,382			40,391
Net income attributable to non-controlling interest	103			43
Net income attributable to Core Laboratories N.V.	$	48,279		$	40,348
EARNINGS (LOSS) PER SHARE INFORMATION:
Basic earnings per share from continuing operations	$	1.11		$	0.88
Basic earnings (loss) per share from discontinued operations	$	(0.02	)	$	0.03
Basic earnings per share attributable to Core Laboratories N.V.	$	1.09		$	0.91
Diluted earnings per share from continuing operations	$	1.10		$	0.88
Diluted earnings (loss) per share from discontinued operations	$	(0.02	)	$	0.03
Diluted earnings per share attributable to Core Laboratories N.V.	$	1.08		$	0.91
Cash dividends per share	$	1.10		$	1.10
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic	44,191			44,162
Diluted	44,515			44,360

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

3

CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
	(Unaudited)						(Unaudited)
Net income	$	24,805		$	22,709		$	48,382		$	40,391
Other comprehensive income:
Derivatives
Gain (loss) in fair value of interest rate swaps	235			(278		)	881			(197		)
Interest rate swap amounts reclassified to interest expense	25			140			89			307
Income taxes on derivatives	(54		)	48			(204		)	(39		)
Total derivatives	206			(90		)	766			71
Pension and other postretirement benefit plans
Prior service cost
Amortization to net income of prior service cost	(18		)	(19		)	(39		)	(38		)
Amortization to net income of actuarial loss	84			110			168			220
Income taxes on pension and other postretirement benefit plans	(17		)	(22		)	(32		)	(46		)
Total pension and other postretirement benefit plans	49			69			97			136
Total other comprehensive income (loss)	255			(21		)	863			207
Comprehensive income	25,060			22,688			49,245			40,598
Comprehensive income attributable to non-controlling interest	53			19			103			43
Comprehensive income attributable to Core Laboratories N.V.	$	25,007		$	22,669		$	49,142		$	40,555

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

4

CORE LABORATORIES N.V.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Six Months Ended
	June 30,
	2018			2017
	(Unaudited)
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$	49,056		$	38,946
Income (loss) from discontinued operations, net of tax	(674		)	1,445
Net income	48,382			40,391
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	12,392			11,563
Depreciation and amortization	11,686			12,493
Changes to value of life insurance policies	(1,426		)	(48		)
Deferred income taxes	397			6,766
Other non-cash items	494			(325		)
Changes in assets and liabilities:
Accounts receivable	(5,425		)	(14,527		)
Inventories	(7,113		)	(1,926		)
Prepaid expenses and other current assets	(4,067		)	(3,675		)
Other assets	457			(1,083		)
Accounts payable	3,440			8,443
Accrued expenses	(5,830		)	(12,459		)
Unearned revenues	203			1,356
Other long-term liabilities	(3,507		)	1,507
Net cash provided by operating activities	50,083			48,476
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(11,915		)	(9,362		)
Patents and other intangibles	(878		)	(203		)
Proceeds from sale of assets	199			511
Premiums on life insurance	(720		)	(863		)
Net cash used in investing activities	(13,314		)	(9,917		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(57,000		)	(67,000		)
Proceeds from debt borrowings	73,000			84,000
Debt financing costs	(1,553		)	—
Non-controlling interest - dividend	—			(27		)
Dividends paid	(48,635		)	(48,590		)
Repurchase of common shares	(3,960		)	(7,388		)
Net cash used in financing activities	(38,148		)	(39,005		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,379		)	(446		)
CASH AND CASH EQUIVALENTS, beginning of period	14,400			14,764
CASH AND CASH EQUIVALENTS, end of period	$	13,021		$	14,318

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

5

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, 2017 (the "2017 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 and six months ended June 30, 2018 may not necessarily be indicative of the results that may be expected for the year ending December 31, 2018.

Core Laboratories N.V.'s balance sheet information for the year ended December 31, 2017 was derived from the 2017 audited consolidated financial statements but does not include all disclosures in accordance with U.S. GAAP.

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.

We operate our business in two 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 to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.

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

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 and six months ended June 30, 2017.

2.  INVENTORIES

Inventories consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Finished goods	$	25,200	$	21,668
Parts and materials	11,476		10,613
Work in progress	3,179		1,036
Total inventories	$	39,855	$	33,317

We include freight costs incurred for shipping inventory to our clients in the Cost of product sales caption in the accompanying Consolidated Statements of Operations.

6

3. SIGNIFICANT ACCOUNTING POLICIES UPDATE

Our significant accounting policies are detailed in "Note 1: Summary of Significant Accounting Policies" of our Annual Report on Form 10-K for the year ended December 31, 2017. Significant changes to our accounting policies as a result of adopting Topic 606 - Revenue From Contracts with Customers are discussed below:

Revenue Recognition

All of our revenue is derived from contracts with clients and is reported as revenue in the Consolidated Statements of Operations. Our contracts generally include standard commercial payment terms generally acceptable in each region, and do not include financing with extended payment terms. We have no significant obligations for refunds, warranties, or similar obligations. Our revenue does not include taxes collected from our customers. In certain circumstances we apply the guidance in Accounting Standards Codification Topic 606 - Revenue From Contracts with Customers ("Topic 606") to a portfolio of contracts with similar characteristics. We use estimates and assumptions when accounting for a portfolio that reflect the size and composition of the portfolio of contracts.

A performance obligation is a promise in a contract to transfer a distinct service or good to a client, and is the unit of account under Topic 606. We have contracts with two general groups of performance obligations: those that require us to perform analysis and/or diagnostic tests in our laboratory or at the client's wellsite and those from the sale of tools, diagnostic and equipment products and related services. We recognize revenue at an amount that reflects the consideration expected to be received in exchange for such services or goods as described below by applying the five-step method to: (1) identify the contract(s) with clients; (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) we satisfy the performance obligation(s).

Services Revenue: We provide a variety of services to clients in the oil and gas industry. Where services are provided related to the testing and analysis of rock and fluids, we recognize revenue upon the provision of the test results or analysis to the client. For our design, field engineering and completion diagnostic services, we recognize revenue upon the delivery of those services at the well site or delivery of diagnostic data. In the case of our consortia studies, we have multiple performance obligations and revenue is recognized at the point in time when the testing and analysis results on each contributed core are made available to our consortia members. We conduct testing and provide analysis services in support of our consortia studies recognizing revenue as the testing and analysis results are made available to our consortia members.

Product Sales Revenue: We manufacture equipment that we sell to our clients in the oil and gas industry. Revenue is recognized when title to that equipment passes to the client, which is typically when the product is shipped to the client or picked up by the client at our facilities, as set out in the contract.

For arrangements that include multiple performance obligations, we allocate revenue to each performance obligation based on estimates of the price that we would charge the client for each promised service or product if it were sold on a standalone basis.

To a lesser extent in all of our business segments, we enter into other types of contracts including service arrangements and non-subscription software and licensing agreements. We recognize revenue for these arrangements over time or at a point in time depending on our evaluation of when the client obtains control of the promised services or products.

Contract Assets and Liabilities

Contract assets and liabilities result due to the timing of revenue recognition, billings and cash collections.

Contract assets include our right to payment for goods and services already transferred to a customer when the right to payment is conditional on something other than the passage of time, for example contracts where we recognize revenue over time but do not have a contractual right to payment until we complete the performance obligations. Contract assets are included in our accounts receivable and are not material as of June 30, 2018.

Contract liabilities consist of advance payments received and billings in excess of revenue recognized. We generally receive up-front payments relating to our consortia studies; we recognize revenue over the life of the study as the testing and analysis results are made available to our consortia members. We record billings in excess of revenue recognized for contracts with a duration less than twelve months as unearned revenue. We classify contract liabilities for contracts with a duration greater than twelve months as current or non-current based on the timing of when we expect to recognize revenue. The current portion of contract liabilities is included in unearned revenue and the non-current portion of contract liabilities is included in long-term

7

contract liabilities in our consolidated balance sheet. The total balance of our contract liabilities at June 30, 2018 and December 31, 2017 was $9.2 million and $6.7 million, respectively.

Disaggregation of Revenue

We contract with clients for service revenue and/or product sales revenue. We present revenue disaggregated by services and product sales in our Consolidated Statements of Operations. For revenue disaggregated by reportable segment, please see Note 15, Segment Reporting.

4. CONTRACT ASSETS AND CONTRACT LIABILITIES

The balance of contract assets and contract liabilities consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Contract assets
Current	$	673	$	325
Contract Liabilities
Current	$	4,538	$	2,252
Non-current	4,664		4,442
	$	9,202	$	6,694

	June 30, 2018
Estimate of when contract liabilities will be recognized
within 12 months	$	4,538
within 12 to 24 months	3,988
greater than 24 months	676

We did not recognize any impairment losses on our receivables and contract assets for the three and six months ended June 30, 2018.

5.  DISCONTINUED OPERATIONS

In the first quarter of 2018, in a continuing effort to streamline our business and align our business strategy for further integration of services and products, the Company committed to divest the business of our full range of permanent downhole monitoring systems and related services, which had been part of our Production Enhancement segment. We anticipate the sale of this business line will occur by the end of the first quarter of 2019.

The associated results of operations are separately reported as Discontinued Operations for all periods presented on the Consolidated Statements of Operations. Balance sheet items for this discontinued business, including an allocation of goodwill from the Production Enhancement segment, have been reclassified to Other current assets and Other current liabilities in the Consolidated Balance Sheet. Cash flows from this discontinued business are shown in the table below. As such, the results from continuing operations for the Company and segment highlights for Production Enhancement, exclude these discontinued operations.

8

Selected data for this discontinued business consisted of the following (in thousands):

	Three Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	427		$	299
Sales revenue	1,179			5,392
Total revenue	1,606			5,691
Cost of services, exclusive of depreciation expense shown below	309			63
Cost of product sales, exclusive of depreciation expense shown below	1,361			3,420
Depreciation and Amortization	44			114
Other Expense	14			42
Operating Income (Loss)	(122		)	2,052
Income tax expense (benefit)	206			297
Income (loss) from discontinued operations, net of income taxes	$	(328	)	$	1,755
	Six Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	902		$	633
Sales revenue	1,710			6,256
Total revenue	2,612			6,889
Cost of services, exclusive of depreciation expense shown below	874			390
Cost of product sales, exclusive of depreciation expense shown below	2,180			4,645
Depreciation and Amortization	102			236
Other Expense (income)	22			(74		)
Operating Income (loss)	(566		)	1,692
Income tax expense (benefit)	108			247
Income (loss) from discontinued operations, net of income taxes	$	(674	)	$	1,445
	June 30, 2018			December 31, 2017
Current assets	$	2,529		$	2,549
Non-current assets	1,861			1,048
Total assets	$	4,390		$	3,597
Current liabilities	$	840		$	221
Non-current liabilities	75			75
Total liabilities	$	915		$	296

Net cash provided by (used in) operating activities of discontinued operations for the three and six months ended June 30, 2018 was $(0.4) million and $0.1 million, respectively.

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6.  LONG-TERM DEBT

We have no capital lease obligations. Long-term debt is as follows (in thousands):

	June 30, 2018			December 31, 2017
Senior notes	$	150,000		$	150,000
Credit facility	94,000			78,000
Total long-term debt	244,000			228,000
Less: Debt issuance costs	(2,313		)	(1,011		)
Long-term debt, net	$	241,687		$	226,989

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.

On June 19, 2018, we entered into an agreement to amend our revolving credit facility ("Credit Facility"). To appropriately size the facility, the aggregate borrowing commitment has been reduced from $400 million to $300 million. The Credit Facility provides an option to increase the commitment under the Credit Facility by an additional $100 million to bring the total borrowings available to $400 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.375% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due June 19, 2023, 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 $12.8 million at June 30, 2018, resulting in an available borrowing capacity under the Credit Facility of $193.2 million. In addition to those items under the Credit Facility, we had $13.4 million of outstanding letters of credit and performance guarantees and bonds from other sources as of June 30, 2018.

The terms of the Credit Facility, which remained substantially the same, 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 13 - Derivative Instruments and Hedging Activities.

The estimated fair value of total debt at June 30, 2018 and December 31, 2017 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.

7.  PENSION

Defined Benefit Plan

We provide a noncontributory defined benefit pension plan covering 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.

10

The following table summarizes the components of net periodic pension cost under the Dutch Plan (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Service cost	$	392		$	366		$	741		$	741
Interest cost	336			268			636			543
Expected return on plan assets	(290		)	(228		)	(549		)	(460		)
Amortization of prior service cost	(18		)	(19		)	(39		)	(38		)
Amortization of actuarial loss	84			110			168			220
Net periodic pension cost	$	504		$	497		$	957		$	1,006

Upon adoption of ASU 2017-07 ("Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost") on January 1, 2018, the service cost component of net periodic pension cost is included in cost of sales and cost of services; the interest cost component of net periodic pension cost is included in the line item "interest expense" in the income statement and all other components of net periodic pension cost are included in the line item "other (income) expense, net" in the income statement. During the six months ended June 30, 2018, we contributed $1.4 million to fund the estimated 2018 premiums on investment contracts held by the Dutch Plan.

8. 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.

9.  EQUITY

During the three and six months ended June 30, 2018, we repurchased 5,960 and 36,258 of our common shares for $0.6 million and $4.0 million, respectively. These included rights to 5,960 and 16,258 shares valued at $0.6 million and $1.7 million, respectively, 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 19,903 and 55,589 treasury shares upon vesting of stock-based awards during the three and six months ended June 30, 2018, respectively.

In February and May 2018, we paid a quarterly dividend of $0.55 per share of common stock. In addition, on July 13, 2018, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on July 23, 2018 and payable on August 13, 2018.

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The following table summarizes our changes in equity for the six months ended June 30, 2018 (in thousands):

	Common Shares		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity
December 31, 2017	$	1,148	$	54,463	$	173,855		$	(8,353	)	$	(76,269	)	$	3,888	$	148,732
Stock based-awards	—		4,464		—			—			7,928			—		12,392
Repurchase of common shares	—		—		—			—			(3,960		)	—		(3,960		)
Dividends paid	—		—		(48,635		)	—			—			—		(48,635		)
Amortization of deferred pension costs, net of tax	—		—		—			97			—			—		97
Interest rate swaps, net of tax	—		—		—			766			—			—		766
Net income	—		—		48,279			—			—			103		48,382
June 30, 2018	$	1,148	$	58,927	$	173,499		$	(7,490	)	$	(72,301	)	$	3,991	$	157,774

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

	June 30, 2018			December 31, 2017
Prior service cost	$	512		$	541
Unrecognized net actuarial loss	(8,577		)	(8,703		)
Fair value of derivatives, net of tax	575			(191		)
Total accumulated other comprehensive income (loss)	$	(7,490	)	$	(8,353	)

10.  EARNINGS PER SHARE

We compute basic earnings per common share by dividing net income attributable to Core Laboratories N.V. 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		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
Weighted average basic common shares outstanding	44,203	44,164	44,191	44,162
Effect of dilutive securities:
Performance shares	205	148	255	143
Restricted stock	85	62	69	55
Weighted average diluted common and potential common shares outstanding	44,493	44,374	44,515	44,360

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11. OTHER (INCOME) EXPENSE, NET

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Sale of assets	$	81		$	(123	)	$	(508	)	$	(302	)
Results of non-consolidated subsidiaries	(11		)	(96		)	(69		)	(175		)
Foreign exchange	654			358			1,086			455
Rents and royalties	(141		)	(109		)	(236		)	(231		)
Return on pension assets and other pension costs	(224		)	(137		)	(420		)	(278		)
Severance, compensation and other charges	—			—			—			1,145
Other, net	(176		)	41			187			309
Total other (income) expense, net	$	183		$	(66	)	$	40		$	923

Foreign exchange gains and losses are summarized in the following table (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(Gains) losses by currency	2018			2017			2018			2017
Angolan Kwanza	$	57		$	(4	)	$	161		$	(3	)
Australian Dollar	32			18			110			13
British Pound	104			(74		)	(23		)	(55		)
Canadian Dollar	243			(58		)	357			(77		)
Euro	(259		)	732			(16		)	835
Indonesian Rupiah	142			5			178			(25		)
Other currencies, net	335			(261		)	319			(233		)
Total loss, net	$	654		$	358		$	1,086		$	455

12.  INCOME TAX EXPENSE

The effective tax rates for the three months ended June 30, 2018 and 2017 were 16.6% and 15.0%, respectively, and for the six months ended June 30, 2018 and 2017 were 17.3% and 14.6%, respectively. Income tax expense of $5.0 million in the second quarter of 2018increased by $1.3 million compared to $3.7 million in the same period in 2017, due to the result of several items discrete to each quarter, along with changes in activity levels in jurisdictions with differing tax rates.

13.  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 1.375% to a maximum of LIBOR plus 2.00%. As a result of two interest rate swap agreements, we are subject to interest rate risk on debt in excess of $50 million drawn on our Credit Facility.

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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 an asset or 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 gain (loss) and are recognized in income as an increase or decrease to interest expense in the period in which the related cash flows being hedged are recognized in expense.

At June 30, 2018, we had fixed rate long-term debt aggregating $200 million and variable rate long-term debt aggregating $44 million, after taking into account the effect of the swaps.

The fair values of outstanding derivative instruments are as follows (in thousands):

	Fair Value of Derivatives
	June 30, 2018		December 31, 2017			Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	205	$	70		Other long-term assets
10 year interest rate swap	344		(492		)	Other long-term assets (liabilities)
	$	549	$	(422	)

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 (in thousands):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018			2017		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	(12	)	$	46	$	(4	)	$	105	Increase (decrease) to interest expense
10 year interest rate swap	37			94		93			202		Increase to interest expense
	$	25		$	140	$	89		$	307

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14.  FINANCIAL INSTRUMENTS

The Company's only financial assets and liabilities which are measured at fair value on a recurring basis 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. The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			June 30, 2018
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	47,327	$	—	$	47,327	$	—
5 year interest rate swap	205		—		205		—
10 year interest rate swap	344		—		344		—
	47,876		—		47,876		—
Liabilities:
Deferred compensation plan	$	38,583	$	—	$	38,583	$	—
	$	38,583	$	—	$	38,583	$	—

			Fair Value Measurement at
			December 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	46,145	$	—	$	46,145	$	—
5 year interest rate swap	70		—		70		—
	$	46,215	$	—	$	46,215	$	—
Liabilities:
Deferred compensation plan	$	37,280	$	—	$	37,280	$	—
10 year interest rate swap	492		—		492		—
	$	37,772	$	—	$	37,772	$	—
(1) Deferred compensation assets consist of the cash surrender value of life insurance policies and are intended to assist in the funding of the deferred compensation agreements.

15.  SEGMENT REPORTING

We operate our business in two 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 to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.

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

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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		Corporate & Other 1			Consolidated
Three Months Ended June 30, 2018
Revenue from unaffiliated clients	$	102,107	$	73,368	$	—		$	175,475
Inter-segment revenue	73		101		(174		)	—
Segment operating income	14,760		18,427		262			33,449
Total assets (at end of period)	319,122		218,011		67,611			604,744
Capital expenditures	5,384		1,938		150			7,472
Depreciation and amortization	4,290		1,006		572			5,868
Three Months Ended June 30, 2017
Revenue from unaffiliated clients	$	104,313	$	53,899	$	—		$	158,212
Inter-segment revenue	47		249		(296		)	—
Segment operating income (loss)	18,670		8,713		(28		)	27,355
Total assets (at end of period)	319,433		200,583		63,742			583,758
Capital expenditures	2,098		769		46			2,913
Depreciation and amortization	4,528		1,142		518			6,188
Six Months Ended June 30, 2018
Revenue from unaffiliated clients	$	202,916	$	142,577	$	—		$	345,493
Inter-segment revenue	120		152		(272		)	—
Segment operating income	29,517		36,114		134			65,765
Total assets	319,122		218,011		67,611			604,744
Capital expenditures	7,565		3,785		565			11,915
Depreciation and amortization	8,537		2,008		1,141			11,686
Six Months Ended June 30, 2017
Revenue from unaffiliated clients	$	209,208	$	105,613	$	—		$	314,821
Inter-segment revenue	221		450		(671		)	—
Segment operating income (loss)	34,610		17,150		(866		)	50,894
Total assets	319,433		200,583		63,742			583,758
Capital expenditures	4,675		3,789		898			9,362
Depreciation and amortization	9,148		2,306		1,039			12,493

(1) "Corporate & Other" represents those items that are not directly related to a particular segment, eliminations and the assets and liabilities of discontinued operations.

16.  RECENT ACCOUNTING PRONOUNCEMENTS

Pronouncements Adopted in 2018

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. We adopted this standard and all related amendments on January 1, 2018. The adoption of this standard did not result in any material changes to our revenue recognition policies and procedures nor to our financial statements. Upon adoption we used the modified retrospective approach; this approach resulted in no cumulative adjustment to retained earnings or net income and no adjustments to prior periods.

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In March 2017, the FASB issued ASU 2017-07 ("Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost"), which requires that an employer report the service cost component of net periodic pension cost in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. We adopted this standard on January 1, 2018. We used the practical expedient method which allows us to use the amounts disclosed in our pension footnote for the three and six months ended June 30, 2017 as the estimation basis for applying the retrospective presentation requirements. The adoption of this standard did not result in any material changes to our consolidated financial statements.

Pronouncements Not Yet Effective

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 anticipate the adoption of this standard will have a material impact on our Consolidated Balance Sheets, increasing both asset balances and liability balances; however, there should not be a material impact to our Consolidated Statement of Operations.

In June 2016, the FASB issued ASU 2016-13 ("Measurement of Credit Losses on Financial Instruments") which replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years with early adoption permitted in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In February 2018, the FASB issued ASU 2018-02 ("Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income"), which provides companies with an option to reclassify stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act ("TCJA") from accumulated other comprehensive income to retained earnings. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted, and would be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the tax rate as a result of TCJA is recognized. We do not expect the adoption of this standard to have a material impact 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 June 30, 2018 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, 2017 (the "2017 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 and production enhancement 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 4,600 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 two reportable segments: Reservoir Description and Production Enhancement. 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 to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.

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

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 2017 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 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.

We are encouraged by the increased focus of our major clients regarding capital management, return on invested capital (“ROIC”), free cash flow, and returning capital back to their shareholders, as opposed to a focus on production growth at any cost. The companies adopting value versus volume metrics tend to be the more technologically sophisticated operators and form the foundation of Core’s worldwide client base. We expect to benefit from our clients’ shift in focus from strictly production growth to employing higher technological solutions in their efforts to maximize economic production growth and estimated ultimate recovery ("EUR").

Crude oil prices began to recover and become more stable during 2017, especially during the second half of 2017. On average, pricing for crude oil improved over 16% for 2017 when compared to 2016. This trend has continued in 2018, with crude oil prices improving 19% since the end of 2017, and as a result land-based activity associated with the exploitation and production of oil in the United States continued to increase during the first half of 2018.

North America completion activity levels continued to expand in the first half of 2018. According to Baker Hughes, the U.S. land-based rig count at June 30, 2018 was 13% higher than at the end of 2017. We believe this increase is in response to the improved pricing of crude oil as the average price of crude oil for the six months ended June 30, 2018 was approximately $68.10 per barrel while the average price of crude oil for 2017 was approximately $52.46 per barrel. We expect the average U.S. rig count and associated activities to remain at similar levels for the remainder of 2018, with completion activity levels showing modest growth. However, the U.S. completion growth rate may moderate until certain logistical bottlenecks are resolved (e.g. for the industry to hire and train new frac crews, acquire and/or update pressure pumping equipment, and supply chain logistics). In addition, an emerging trend to larger pad drilling sites, increasing from six to eight wells up to 24 wells, will create an increase in drilled but uncompleted wells over the next several quarters. Combined, these issues could impact the rate of revenue growth opportunity for any company that is reliant on completions as a catalyst for growth.

We continue to focus on large-scale core analyses and reservoir fluids characterization studies in the Eagle Ford, the Permian Basin and the Gulf of Mexico, along with Guyana, Malaysia and other international locations such as offshore South America, and the Middle East, including Kuwait and the United Arab Emirates. We also focus on complex completions in unconventional tight-oil reservoirs, technological solutions and services for increasing daily productions and EURs.

Additionally, renewed investment at a global level is critical in order to meet future supply needs. Oil company recognition of the need for investment is evidenced by the approximately 25 - 30 final investment decision ("FIDs") estimated to be announced in 2018, with 15 already announced year-to-date. These FIDs would follow the more than 20 FIDs announced in 2017. However, the delays in the recovery of international field development activity are impacting and deferring revenue opportunities for the Company in 2018.

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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 June 30,										Change
	2018					2017					$			%
REVENUE:
Services	$	122,094		70	%	$	116,940		74	%	$	5,154		4	%
Product sales	53,381			30	%	41,272			26	%	12,109			29	%
Total revenue	175,475			100	%	158,212			100	%	17,263			11	%
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below*	86,759			71	%	80,368			69	%	6,391			8	%
Cost of product sales, exclusive of depreciation expense shown below*	37,014			69	%	33,267			81	%	3,747			11	%
Total cost of services and product sales	123,773			71	%	113,635			72	%	10,138			9	%
General and administrative expense	12,202			7	%	11,100			7	%	1,102			10	%
Depreciation and amortization	5,868			3	%	6,188			4	%	(320		)	(5	)%
Other (income) expense, net	183			—	%	(66		)	—	%	249			NM
Operating income	33,449			19	%	27,355			17	%	6,094			22	%
Interest expense	3,296			2	%	2,692			2	%	604			22	%
Income before income tax expense	30,153			17	%	24,663			16	%	5,490			22	%
Income tax expense	5,020			3	%	3,709			2	%	1,311			35	%
Income from continuing operations	25,133			14	%	20,954			13	%	4,179			20	%
Income (loss) from discontinued operations, net of tax	(328		)	—	%	1,755			1	%	(2,083		)	NM
Net Income	24,805			14	%	22,709			14	%	2,096			9	%
Net income (loss) attributable to non-controlling interest	53			—	%	19			—	%	34			NM
Net income attributable to Core Laboratories N.V.	$	24,752		14	%	$	22,690		14	%	$	2,062		9	%
"NM"  means not meaningful
* Percentage based on applicable revenue rather than total revenue.

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	Three Months Ended										Change
	June 30, 2018					March 31, 2018					$			%
REVENUE:
Services	$	122,094		70	%	$	119,786		70	%	$	2,308		2	%
Product sales	53,381			30	%	50,232			30	%	3,149			6	%
Total revenue	175,475			100	%	170,018			100	%	5,457			3	%
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below*	86,759			71	%	83,288			70	%	3,471			4	%
Cost of product sales, exclusive of depreciation expense shown below*	37,014			69	%	36,030			72	%	984			3	%
Total cost of services and product sales	123,773			71	%	119,318			70	%	4,455			4	%
General and administrative expense	12,202			7	%	12,709			7	%	(507		)	(4	)%
Depreciation and amortization	5,868			3	%	5,818			3	%	50			1	%
Other (income) expense, net	183			—	%	(143		)	—	%	326			NM
Operating income	33,449			19	%	32,316			19	%	1,133			4	%
Interest expense	3,296			2	%	3,120			2	%	176			6	%
Income before income tax expense	30,153			17	%	29,196			17	%	957			3	%
Income tax expense	5,020			3	%	5,273			3	%	(253		)	(5	)%
Income from continuing operations	25,133			14	%	23,923			14	%	1,210			5	%
Income (loss) from discontinued operations	(328		)	—	%	(346		)	—	%	18			NM
Net income	24,805			14	%	23,577			14	%	1,228			5	%
Net income attributable to non-controlling interest	53			—	%	50			—	%	3			NM
Net income attributable to Core Laboratories N.V.	$	24,752		14	%	$	23,527		14	%	$	1,225		5	%
"NM"  means not meaningful
* Percentage based on applicable revenue rather than total revenue.

21

	Six Months Ended June 30,									Change
	2018					2017				$			%
REVENUE:
Services	$	241,880		70	%	$	237,542	75	%	$	4,338		2	%
Product sales	103,613			30	%	77,279		25	%	26,334			34	%
Total revenue	345,493			100	%	314,821		100	%	30,672			10	%
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below*	170,047			70	%	163,642		69	%	6,405			4	%
Cost of product sales, exclusive of depreciation expense shown below*	73,044			70	%	63,013		82	%	10,031			16	%
Total cost of services and product sales	243,091			70	%	226,655		72	%	16,436			7	%
General and administrative expense	24,911			7	%	23,856		8	%	1,055			4	%
Depreciation and amortization	11,686			3	%	12,493		4	%	(807		)	(6	)%
Other (income), net	40			—	%	923		—	%	(883		)	NM
Operating income	65,765			19	%	50,894		16	%	14,871			29	%
Interest expense	6,416			2	%	5,310		2	%	1,106			21	%
Income before income tax expense	59,349			17	%	45,584		14	%	13,765			30	%
Income tax expense	10,293			3	%	6,638		2	%	3,655			55	%
Income from continuing operations	49,056			14	%	38,946		12	%	10,110			26	%
Income (loss) from discontinued operations	(674		)	—	%	1,445		—	%	(2,119		)	NM
Net income	48,382			14	%	40,391		13	%	7,991			20	%
Net income attributable to non-controlling interest	103			—	%	43		—	%	60			NM
Net income attributable to Core Laboratories N.V.	$	48,279		14	%	$	40,348	13	%	$	7,931		20	%
"NM"  means not meaningful
* Percentage based on applicable revenue rather than total revenue.

Operating Results for the Three Months Ended June 30, 2018 Compared to the Three Months Ended June 30, 2017 and March 31, 2018 and for the Six Months EndedJune 30, 2018 Compared to the Six Months EndedJune 30, 2017

Services Revenue

Services revenue of $122.1 million in the second quarter of 2018 increased 4% year-over-year from $116.9 million, mainly driven by the increases in North America land-based activity levels compared to last year. Services revenue increased 2% sequentially to $122.1 million for the second quarter of 2018 from $119.8 million for the first quarter of 2018, which is also attributable to the improvement in North American land-based activity, while international activity has remained relatively flat. Services revenue increased 2% to $241.9 million for the six months ended June 30, 2018 from $237.5 million for the six months ended June 30, 2017, which is primarily attributable to increases in North America exploration and production activity levels in 2018 compared with 2017. International activity has remained flat as most international development projects continue to be funded largely from operating budgets. We continue to focus on large-scale core analyses and reservoir fluids characterization studies in the Eagle Ford, the Permian Basin and the Gulf of Mexico, along with Guyana, Malaysia and other international locations such as offshore South America, and the Middle East, including Kuwait and the United Arab Emirates. Additionally, we have client interest in our existing multi-client reservoir studies such as the Tight Oil Reservoirs of the Midland Basin study and the Deepwater Gulf of Mexico - Phase II as well as several major enhanced oil recovery ("EOR") projects for unconventional reservoirs such as the newly initiated Unconventional EOR in the Eagle Ford Formation and similar EOR joint industry projects for tight-oil developments in other basins.

22

Product Sales Revenue

Revenue associated with product sales of $53.4 million in the second quarter of 2018, increased 29% year-over-year from $41.3 million in the second quarter of 2017 and increased 6% from $50.2 million for the first quarter of 2018. Revenue associated with product sales increased 34% to $103.6 million for the six months ended June 30, 2018 from $77.3 million for the six months ended June 30, 2017. Our product sales revenue is primarily driven by completions of wells in the North American market and, more specifically, the activity associated with the completion of each stage in a wellbore. We continue to benefit from increasing completion activity in the U.S. and our clients' acceptance of new products which were led by our newly introduced technologies, including our HERO^® PerFRAC perforating system.

Cost of Services, excluding depreciation

Cost of services expressed as a percentage of services revenue showed a slight increase to 71% for the three months ended June 30, 2018, compared to 69% and 70% for the three months ended June 30, 2017 and March 31, 2018, respectively. Cost of services expressed as a percentage of services revenue is primarily reflective of how our fixed cost structure is being absorbed by revenue. Cost of services for the three months ended June 30, 2018, included some additional costs to expand operations in certain locations associated with deployment of new laboratory technology and infrastructure for upcoming international projects. Cost of services expressed as a percentage of services revenue remained consistent at 70% for the six months ended June 30, 2018 and for the six months ended June 30, 2017.

Cost of Product Sales, excluding depreciation

Cost of product sales expressed as a percentage of product sales revenue improved to 69% for the three months ended June 30, 2018, compared to 81% and 72% for the three months ended June 30, 2017 and March 31, 2018, respectively. The improvement in cost of product sales as a percentage of product sales revenue was primarily due to the improved absorption rates of our fixed costs. Cost of product sales expressed as a percentage of product sales revenue improved to 70% for the six months ended June 30, 2018, compared to 82% for the six months ended June 30, 2017.

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 ended June 30, 2018 was $12.2 million compared to $11.1 million and $12.7 million for the three months ended June 30, 2017 and March 31, 2018, respectively. G&A expense for the six months ended June 30, 2018 was $24.9 million, compared to $23.9 million for the six months ended June 30, 2017. The variances are primarily due to changes in compensation expense during those periods.

Depreciation and Amortization Expense

Depreciation and amortization expense for the three months ended June 30, 2018 was $5.9 million compared to $6.2 million and $5.8 million for the three months ended June 30, 2017 and March 31, 2018, respectively. Depreciation and amortization expense for the six months ended June 30, 2018 was $11.7 million, compared to $12.5 million for the six months ended June 30, 2017. Reduced capital expenditures during 2016 and 2017 in response to the industry downturn has led to lower depreciation expense in the first half of 2018.

23

Other (Income) Expense, Net

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Sale of assets	$	81		$	(123	)	$	(508	)	$	(302	)
Results of non-consolidated subsidiaries	(11		)	(96		)	(69		)	(175		)
Foreign exchange	654			358			1,086			455
Rents and royalties	(141		)	(109		)	(236		)	(231		)
Return on pension assets and other pension costs	(224		)	(137		)	(420		)	(278		)
Severance, compensation and other charges	—			—			—			1,145
Other, net	(176		)	41			187			309
Total other (income) expense, net	$	183		$	(66	)	$	40		$	923

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Angolan Kwanza	$	57		$	(4	)	$	161		$	(3	)
Australian Dollar	32			18			110			13
British Pound	104			(74		)	(23		)	(55		)
Canadian Dollar	243			(58		)	357			(77		)
Euro	(259		)	732			(16		)	835
Indonesian Rupiah	142			5			178			(25		)
Other currencies, net	335			(261		)	319			(233		)
Total loss, net	$	654		$	358		$	1,086		$	455

Interest Expense

Interest expense for the three months ended June 30, 2018 was $3.3 million compared to $2.7 million and $3.1 million for the three months ended June 30, 2017 and March 31, 2018, respectively. Interest expense for the six months ended June 30, 2018 was $6.4 million, compared to $5.3 million for the six months ended June 30, 2017.

Income Tax Expense

The effective tax rates for the three months ended June 30, 2018 was 16.6% compared to 15.0% and 18.1% for the three months ended to June 30, 2017 and March 31, 2018, respectively. Income tax expense was $5.0 million in the second quarter of 2018 compared to $3.7 million and $5.3 million for the three months ended June 30, 2017 and March 31, 2018, respectively, due to the result of several items discrete to each quarter, along with changes in activity levels in jurisdictions with differing tax rates. Income tax expense was $10.3 million for the six months ended June 30, 2018, compared to $6.6 million for the six months ended June 30, 2017.

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "Tax Act”) was signed into law reducing the U.S. corporate income tax rate to 21%, effective January 1, 2018. The Tax Act included changes to tax laws which will have an impact on income tax related to our U.S. operations. The Internal Revenue Service ("IRS") has 18 months from the date of enactment to issue final regulations with regard to the Tax Act. Provisions within the new law have been included in our estimate of the annual effective tax rate used in determining income tax expense.  We expect to refine the current year income tax estimate for the new tax law throughout the year as regulations are issued by the IRS. Among the items included within the Tax Act that have the largest impact to Core Lab are the foreign derived intangible income deduction and 100% fixed asset expensing. We have analyzed other provisions of the Tax Act and determined there are no other material impacts to the current year income tax estimate.

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Discontinued Operations

In the first quarter of 2018, in a continuing effort to streamline our business and align our business strategy for further integration of services and products, the Company committed to divest the business of our full range of permanent downhole monitoring systems and related services, which have been part of our Production Enhancement segment. We anticipate the sale of this business line will occur by the end of the first quarter of 2019.

See Note 5, Discontinued Operations for additional information.

Segment Analysis

We operate our business in two 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. The following tables summarize our results by segment (in thousands):

	Three Months Ended June 30,					2018/2017						Three Months Ended March 31,			Q2 / Q1
	2018		2017			$ Change			% Change			2018			$ Change		% Change
Revenue:
Reservoir Description	$	102,107	$	104,313		$	(2,206	)	(2)%			$	100,809		$	1,298	1%
Production Enhancement	73,368		53,899			19,469			36%			69,209			4,159		6%
Consolidated	$	175,475	$	158,212		$	17,263		11%			$	170,018		$	5,457	3%
Operating income (loss):
Reservoir Description	$	14,760	$	18,670		$	(3,910	)	(21)%			$	14,757		$	3	—%
Production Enhancement	18,427		8,713			9,714			111%			17,687			740		4%
Corporate and Other1	262		(28		)	290			NM			(128		)	390		NM
Consolidated	$	33,449	$	27,355		$	6,094		22%			$	32,316		$	1,133	4%
(1) "Corporate and Other" represents those items that are not directly related to a particular segment
"NM"  means not meaningful
			Six Months Ended June 30,
			2018			2017			$ Change			% Change
Revenue:
Reservoir Description			$	202,916		$	209,208		$	(6,292	)	(3.0)%
Production Enhancement			142,577			105,613			$	36,964		35.0%
Consolidated			$	345,493		$	314,821		$	30,672		9.7%
Operating income (loss):
Reservoir Description			$	29,517		$	34,610		$	(5,093	)	(14.7)%
Production Enhancement			36,114			17,150			$	18,964		110.6%
Corporate and Other1			134			(866		)	$	1,000		NM
Consolidated			$	65,765		$	50,894		$	14,871		29.2%
(1) "Corporate and Other" represents those items that are not directly related to a particular segment
"NM"  means not meaningful

25

Reservoir Description

Revenue from the Reservoir Description segment of $102.1 million for the second quarter of 2018 decreased 2% from $104.3 million in the second quarter of 2017, but increased 1% from $100.8 million in the first quarter of 2018. Revenue from the Reservoir Description segment decreased 3% to $202.9 million for the six months ended June 30, 2018, compared to $209.2 million for the six months ended June 30, 2017. The decrease in revenue year-over-year is primarily attributable to delays in the recovery of international field development activity primarily in the North Sea, Middle East and Asia-Pacific regions. During the second quarter of 2018, Core provided its clients with on-site sample collection services and pressure-volume-temperature ("PVT") laboratory measurements that allowed clients to calculate the economic value of their reservoirs under primary production. Furthermore, these data form the criteria necessary to determine when secondary, and possibly tertiary, recovery techniques might best be applied to optimize the EUR from these reservoirs. New fluid phase behavior projects were initiated in the Eagle Ford, the Permian Basin and the Gulf of Mexico, along with Guyana, Malaysia and other international locations. In addition to these PVT services, Core Lab performed customized reservoir condition EOR studies. These include the determination of minimum miscibility pressures, physical measurements of crude oil properties following gas injection and thermodynamic testing for reservoir simulation models. These test results allow Core’s clients to calculate the economic viability of miscible tertiary recovery processes, which could extend reservoir life and improve incremental hydrocarbon production.

Operating income of $14.8 million in the second quarter of 2018 decreased 21% year-over-year compared to $18.7 million in the second quarter of 2017 and was flat from the first quarter of 2018. This decrease was primarily due to lower international activity levels during the second quarter of 2018 compared to the prior periods and increased costs associated with the deployment of new laboratory technology and infrastructure to service markets, such as new client-driven labs in Qatar and Indonesia which impacted second quarter operating margins. Operating income was $29.5 million for the six months ended June 30, 2018, compared to $34.6 million for the six months ended June 30, 2017.

Operating margins were over 14% in the second quarter of 2018, a decrease from 18% in the second quarter of 2017 and from 15% in the first quarter of 2018. Year-to-date operating margins were 15% for the six months ended June 30, 2018, compared to 17% for the six months ended June 30, 2017.

Production Enhancement

Revenue from the Production Enhancement segment, largely focused on North American unconventional tight-oil reservoirs and complex completions and stimulations, was $73.4 million in the second quarter of 2018, an increase of 36% year-over-year from $53.9 million in the second quarter of 2017 and an increase of 6% sequentially from $69.2 million in the first quarter of 2018. Revenue from the Production Enhancement segment increased 35% to $142.6 million for the six months ended June 30, 2018, compared to $105.6 million for the six months ended June 30, 2017. Our clients continue to seek technological solutions for increasing daily production and estimated ultimate recoveries from their reservoirs. We continue to benefit from the increasing completion activity in the U.S. and our clients' acceptance of new services and products which were led by the FLOWPROFILER EDS^TM and HERO^® PerFRAC technologies.

Operating income in the second quarter of 2018 was $18.4 million, an increase from $8.7 million, or 111%, in the second quarter of 2017 and an increase from $17.7 million, or 4%, in the first quarter of 2018. Operating income for the six months ended June 30, 2018 increased 111% to $36.1 million, compared to $17.2 million for the six months ended June 30, 2017. The increased profitability is due to increased demand for our higher margin services and products and impact of higher revenue on our fixed-cost structure.

Operating margins were 25% in the second quarter of 2018, up from 16% in the second quarter of 2017 as we benefited from increased activity, increased demand for higher margin services and products and realized improved absorption rates of our fixed costs across higher revenues and level with the first quarter of 2018. Year-to-date operating margins were 25% for the six months ended June 30, 2018, compared to 16% for the six months ended June 30, 2017.

26

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, our dividend and share repurchase program. 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 June 30, 2018, $11.0 million of our $13.0 million of cash was held by our foreign subsidiaries.

Cash Flows

The following table summarizes cash flows (in thousands):

	Six Months Ended June 30,						2018 / 2017
	2018			2017			% Change
Cash flows provided by/(used in):
Operating activities	$	50,083		$	48,476		3	%
Investing activities	(13,314		)	(9,917		)	34	%
Financing activities	(38,148		)	(39,005		)	(2	)%
Net change in cash and cash equivalents	$	(1,379	)	$	(446	)	209	%

Cash flows provided by operating activities for the first six months of 2018 compared to the same period in 2017 increased primarily due to increased net income offset by changes in working capital.

The increase in cash flows used in investing activities during the first six months of 2018 compared to the same period in 2017 was primarily attributable to increased capital expenditures in 2018.

Cash flows used in financing activities decreased for the first six months of 2018 compared to the same period in 2017. During the first six months of 2018, we increased our debt by $16 million, as compared to increasing it by $17 million during the first six months of 2017. In the first six months of 2018, we repurchased 36,258 shares of our common stock for an aggregate purchase price of $4.0 million compared to the repurchase of 69,428 shares for an aggregate purchase price of $7.4 million during the same period in 2017. During the first six months of 2018, we used $49 million to pay dividends, which is consistent with the amount paid for the same period in 2017.

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 (in thousands):

	Six Months Ended June 30,						2018 / 2017
	2018			2017			% Change
Free cash flow calculation:
Net cash provided by operating activities	$	50,083		$	48,476		3	%
Less: cash paid for capital expenditures	(11,915		)	(9,362		)	27	%
Free cash flow	$	38,168		$	39,114		(2	)%

27

The decrease in free cash flow for the first six months of 2018 compared to the same period in 2017 was primarily due to increases in capital expenditures.

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.

On June 19, 2018, we entered into an agreement to amend our revolving credit facility ("Credit Facility"). To appropriately size the facility, the aggregate borrowing commitment has been reduced from $400 million to $300 million. The Credit Facility provides an option to increase the commitment under the Credit Facility by an additional $100 million to bring the total borrowings available to $400 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.375% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due June 19, 2023, 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 $12.8 million at June 30, 2018, resulting in an available borrowing capacity under the Credit Facility of $193.2 million. In addition to those items under the Credit Facility, we had $13.4 million of outstanding letters of credit and performance guarantees and bonds from other sources as of June 30, 2018.

The terms of the Credit Facility, which remained substantially the same, 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 13 - 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 the ability to issue 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 2017 Annual Report.

Item 4. Controls and Procedures

A complete discussion of our controls and procedures is included in our 2017 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 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 June 30, 2018 at the reasonable assurance level.

28

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 June 30, 2018, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

29

CORE LABORATORIES N.V.

PART II - OTHER INFORMATION

Item 1.  Legal Proceedings

See Note 8 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 2017 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:

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)
April 1 - 30, 2018 (1)	5,635	$	108.22	—	3,886,204
May 1 - 31, 2018 (1)	325	121.68		—	3,886,909
June 1 - 30, 2018 (1)	—	—		—	3,886,909
Total	5,960	$	108.95	—

(1) During the quarter 5,960 shares 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 19,903 treasury shares upon vesting of stock-based awards during the three months ended June 30, 2018.

30

Item 6.  Exhibits

Exhibit No.		Exhibit Title	Incorporated by reference from the following documents
10.1	-	Seventh Amended and Restated Credit Agreement, dated as of June 19, 2018, among Core Laboratories, N.V., and Core Laboratories (U.S.) Interests Holdings, Inc., and the lenders party thereto and Bank of America, N.A., as administrative agent	Form 8-K, June 25, 2018 (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

31

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:	July 26, 2018	By:	/s/ Christopher S. Hill
			Christopher S. Hill
			Chief Financial Officer
			(Duly Authorized Officer and
			Principal Financial Officer)

32

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:	July 26, 2018	By:	/s/ David M. Demshur
			David M. Demshur
			Chief Executive Officer

EX-31.2

Certification

Exhibit 31.2

I, Christopher S. Hill, 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:	July 26, 2018	By:	/s/ Christopher S. Hill
			Christopher S. Hill
			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 June 30, 2018, 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:	July 26, 2018	/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, Christopher S. Hill, Chief Financial Officer of Core Laboratories N.V. (the "Company"), hereby certify that the accompanying report on Form 10-Q for the quarter ended June 30, 2018, 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:	July 26, 2018	/s/ Christopher S. Hill
		Name: Christopher S. Hill
		Title: Chief Financial Officer

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
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	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		44,212,840

XML

Consolidated Balance Sheets Statement - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 13,021	$ 14,400
Accounts receivable, net of allowance for doubtful accounts of $2,474 and $2,590 at 2018 and 2017, respectively	136,148	133,097
Inventories	39,855	33,317
Prepaid expenses	13,967	12,592
Income taxes receivable	11,899	7,508
Other current assets	10,772	6,513
TOTAL CURRENT ASSETS	225,662	207,427
PROPERTY, PLANT AND EQUIPMENT, net	122,787	123,098
INTANGIBLES, net	9,786	9,396
GOODWILL	178,129	179,044
DEFERRED TAX ASSETS	11,498	10,719
OTHER ASSETS	56,882	55,128
TOTAL ASSETS	604,744	584,812
CURRENT LIABILITIES:
Accounts payable	45,278	41,697
Accrued payroll and related costs	21,427	28,887
Taxes other than payroll and income	6,986	7,313
Unearned revenue	12,608	12,627
Income taxes payable	1,167	825
Other current liabilities	13,125	9,227
TOTAL CURRENT LIABILITIES	100,591	100,576
LONG-TERM DEBT, net	241,687	226,989
CONTRACT LIABILITIES	4,664	4,442
DEFERRED COMPENSATION	54,634	52,786
DEFERRED TAX LIABILITIES	6,471	5,323
OTHER LONG-TERM LIABILITIES	38,923	45,964
COMMITMENTS AND CONTINGENCIES (Note 8)
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, 44,796,252 issued and 44,203,536 outstanding at 2018 and 44,796,252 issued and 44,184,205 outstanding at 2017	1,148	1,148
Additional paid-in capital	58,927	54,463
Retained earnings	173,499	173,855
Accumulated other comprehensive income (loss)	(7,490)	(8,353)
Treasury shares (at cost), 592,716 at 2018 and 612,047 at 2017	(72,301)	(76,269)
Total Core Laboratories N.V. shareholders' equity	153,783	144,844
Non-controlling interest	3,991	3,888
TOTAL EQUITY	157,774	148,732
TOTAL LIABILITIES AND EQUITY	$ 604,744	$ 584,812

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Consolidated Balance Sheets Balance Sheet Parenthetical $ in Thousands	Jun. 30, 2018 € / shares	Jun. 30, 2018 USD ($) shares	Dec. 31, 2017 € / shares	Dec. 31, 2017 USD ($) shares
Allowance for doubtful accounts | $		$ 2,474		$ 2,590
Common stock, par value (euro per share) | € / shares	€ 0.02		€ 0.02
Common stock, shares authorized (in shares)		200,000,000		200,000,000
Common stock, shares issued (in shares)		44,796,252		44,796,252
Common stock, shares outstanding (in shares)		44,203,536		44,184,205
Treasury Stock (euro per share)		592,716		612,047
Preferred stock, par value (in shares) | € / shares	€ 0.02		€ 0.02
Preferred stock, shares authorized (in shares)		6,000,000		6,000,000
Preferred stock, shares issued (in shares)		0		0
Preferred stock, shares outstanding (in shares)		0		0

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Consolidated Statements of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUE:
Services	$ 122,094	$ 116,940	$ 241,880	$ 237,542
Product sales	53,381	41,272	103,613	77,279
Total revenue	175,475	158,212	345,493	314,821
OPERATING EXPENSES:
Cost of services, exclusive of depreciation expense shown below	86,759	80,368	170,047	163,642
Cost of product sales, exclusive of depreciation expense shown below	37,014	33,267	73,044	63,013
General and administrative expense, exclusive of depreciation expense shown below	12,202	11,100	24,911	23,856
Depreciation	5,628	5,979	11,210	12,059
Amortization	240	209	476	434
Other (income) expense, net	183	(66)	40	923
OPERATING INCOME	33,449	27,355	65,765	50,894
Interest expense	3,296	2,692	6,416	5,310
Income from continuing operations before income tax expense	30,153	24,663	59,349	45,584
Income tax expense	5,020	3,709	10,293	6,638
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			49,056	38,946
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			(674)	1,445
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest	25,133	20,954
Income (loss) from discontinued operations, net of income taxes	(328)	1,755
Net Income	24,805	22,709	48,382	40,391
Net income attributable to non-controlling interest	53	19	103	43
Net income attributable to Core Laboratories N.V.	$ 24,752	$ 22,690	$ 48,279	$ 40,348
EARNINGS PER SHARE INFORMATION:
Basic earnings per share from continuing operations (in dollar per share)	$ 0.57	$ 0.47	$ 1.11	$ 0.88
Basic loss per share from discontinued operations (in dollar per share)	(0.01)	0.04	(0.02)	0.03
Basic earnings per share attributable to Core Laboratories N.V. (in dollar per share)	0.56	0.51	1.09	0.91
Diluted earnings per share from continuing operations (in dollar per share)	0.57	0.47	1.10	0.88
Diluted loss per share from discontinued operations (in dollar per share)	(0.01)	0.04	(0.02)	0.03
Diluted earnings per share attributable to Core Laboratories N.V. (in dollar per share)	0.56	0.51	1.08	0.91
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.55	$ 1.10	$ 1.10
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic	44,203	44,164	44,191	44,162
Diluted	44,493	44,374	44,515	44,360

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Consolidated Statement of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 24,805	$ 22,709	$ 48,382	$ 40,391
Gain (loss) in fair value of interest rate swaps	235	(278)	881	(197)
Interest rate swap amounts reclassified to interest expense	25	140	89	307
Income taxes on derivatives	(54)	48	(204)	(39)
Total derivatives	206	(90)	766	71
Amortization to net income of prior service cost	(18)	(19)	(39)	(38)
Amortization to net income of actuarial loss	84	110	168	220
Income taxes on pension and other postretirement benefit plans	(17)	(22)	(32)	(46)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	49	69	97	136
Total other comprehensive income (loss)	255	(21)	863	207
Comprehensive income	25,060	22,688	49,245	40,598
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	53	19	103	43
Comprehensive income attributable to Core Laboratories N.V.	$ 25,007	$ 22,669	$ 49,142	$ 40,555

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Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 49,056	$ 38,946
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(674)	1,445
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	48,382	40,391
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	12,392	11,563
Depreciation and amortization	11,686	12,493
Changes to value of life insurance policies	(1,426)	(48)
Deferred income taxes	397	6,766
Other non-cash items	494	(325)
Changes in assets and liabilities:
Accounts receivable	(5,425)	(14,527)
Inventories	(7,113)	(1,926)
Prepaid expenses and other current assets	(4,067)	(3,675)
Other assets	457	(1,083)
Accounts payable	3,440	8,443
Accrued expenses	(5,830)	(12,459)
Unearned revenues	203	1,356
Other long-term liabilities	(3,507)	1,507
Net cash provided by operating activities	50,083	48,476
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(11,915)	(9,362)
Patents and other intangibles	(878)	(203)
Proceeds from sale of assets	199	511
Premiums on life insurance	(720)	(863)
Net cash used in investing activities	(13,314)	(9,917)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(57,000)	(67,000)
Proceeds from debt borrowings	73,000	84,000
Debt financing costs	(1,553)	0
Non-controlling interest - dividend	0	(27)
Dividends paid	(48,635)	(48,590)
Repurchase of common shares	(3,960)	(7,388)
Net cash used in financing activities	(38,148)	(39,005)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,379)	(446)
CASH AND CASH EQUIVALENTS, beginning of period	14,400	14,764
CASH AND CASH EQUIVALENTS, end of period	$ 13,021	$ 14,318

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Basis of Presentation

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

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, 2017 (the "2017 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 and six months ended June 30, 2018 may not necessarily be indicative of the results that may be expected for the year ending December 31, 2018.

Core Laboratories N.V.'s balance sheet information for the year ended December 31, 2017 was derived from the 2017 audited consolidated financial statements but does not include all disclosures in accordance with U.S. GAAP.

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.

We operate our business in two 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 to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.

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

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 and six months ended June 30, 2017.

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Inventories

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Finished goods	$	25,200	$	21,668
Parts and materials	11,476		10,613
Work in progress	3,179		1,036
Total inventories	$	39,855	$	33,317

We include freight costs incurred for shipping inventory to our clients in the Cost of product sales caption in the accompanying Consolidated Statements of Operations.

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Significant Accounting Policies Update

6 Months Ended

Jun. 30, 2018

Accounting Changes and Error Corrections [Abstract]

Significant Accounting Policies Update

SIGNIFICANT ACCOUNTING POLICIES UPDATE

Our significant accounting policies are detailed in "Note 1: Summary of Significant Accounting Policies" of our Annual Report on Form 10-K for the year ended December 31, 2017. Significant changes to our accounting policies as a result of adopting Topic 606 - Revenue From Contracts with Customers are discussed below:

Revenue Recognition

All of our revenue is derived from contracts with clients and is reported as revenue in the Consolidated Statements of Operations. Our contracts generally include standard commercial payment terms generally acceptable in each region, and do not include financing with extended payment terms. We have no significant obligations for refunds, warranties, or similar obligations. Our revenue does not include taxes collected from our customers. In certain circumstances we apply the guidance in Accounting Standards Codification Topic 606 - Revenue From Contracts with Customers ("Topic 606") to a portfolio of contracts with similar characteristics. We use estimates and assumptions when accounting for a portfolio that reflect the size and composition of the portfolio of contracts.

A performance obligation is a promise in a contract to transfer a distinct service or good to a client, and is the unit of account under Topic 606. We have contracts with two general groups of performance obligations: those that require us to perform analysis and/or diagnostic tests in our laboratory or at the client's wellsite and those from the sale of tools, diagnostic and equipment products and related services. We recognize revenue at an amount that reflects the consideration expected to be received in exchange for such services or goods as described below by applying the five-step method to: (1) identify the contract(s) with clients; (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) we satisfy the performance obligation(s).

Services Revenue: We provide a variety of services to clients in the oil and gas industry. Where services are provided related to the testing and analysis of rock and fluids, we recognize revenue upon the provision of the test results or analysis to the client. For our design, field engineering and completion diagnostic services, we recognize revenue upon the delivery of those services at the well site or delivery of diagnostic data. In the case of our consortia studies, we have multiple performance obligations and revenue is recognized at the point in time when the testing and analysis results on each contributed core are made available to our consortia members. We conduct testing and provide analysis services in support of our consortia studies recognizing revenue as the testing and analysis results are made available to our consortia members.

Product Sales Revenue: We manufacture equipment that we sell to our clients in the oil and gas industry. Revenue is recognized when title to that equipment passes to the client, which is typically when the product is shipped to the client or picked up by the client at our facilities, as set out in the contract.

For arrangements that include multiple performance obligations, we allocate revenue to each performance obligation based on estimates of the price that we would charge the client for each promised service or product if it were sold on a standalone basis.

To a lesser extent in all of our business segments, we enter into other types of contracts including service arrangements and non-subscription software and licensing agreements. We recognize revenue for these arrangements over time or at a point in time depending on our evaluation of when the client obtains control of the promised services or products.

Contract Assets and Liabilities

Contract assets and liabilities result due to the timing of revenue recognition, billings and cash collections.

Contract assets include our right to payment for goods and services already transferred to a customer when the right to payment is conditional on something other than the passage of time, for example contracts where we recognize revenue over time but do not have a contractual right to payment until we complete the performance obligations. Contract assets are included in our accounts receivable and are not material as of June 30, 2018.

Contract liabilities consist of advance payments received and billings in excess of revenue recognized. We generally receive up-front payments relating to our consortia studies; we recognize revenue over the life of the study as the testing and analysis results are made available to our consortia members. We record billings in excess of revenue recognized for contracts with a duration less than twelve months as unearned revenue. We classify contract liabilities for contracts with a duration greater than twelve months as current or non-current based on the timing of when we expect to recognize revenue. The current portion of contract liabilities is included in unearned revenue and the non-current portion of contract liabilities is included in long-term contract liabilities in our consolidated balance sheet. The total balance of our contract liabilities at June 30, 2018 and December 31, 2017 was $9.2 million and $6.7 million, respectively.

Disaggregation of Revenue

We contract with clients for service revenue and/or product sales revenue. We present revenue disaggregated by services and product sales in our Consolidated Statements of Operations. For revenue disaggregated by reportable segment, please see Note 15, Segment Reporting.

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Contract Assets and Contract Liabilities

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Contract Assets and Contract Liabilities

CONTRACT ASSETS AND CONTRACT LIABILITIES

The balance of contract assets and contract liabilities consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Contract assets
Current	$	673	$	325
Contract Liabilities
Current	$	4,538	$	2,252
Non-current	4,664		4,442
	$	9,202	$	6,694

	June 30, 2018
Estimate of when contract liabilities will be recognized
within 12 months	$	4,538
within 12 to 24 months	3,988
greater than 24 months	676

We did not recognize any impairment losses on our receivables and contract assets for the three and six months ended June 30, 2018.

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Discontinued Operations

6 Months Ended

Jun. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

In the first quarter of 2018, in a continuing effort to streamline our business and align our business strategy for further integration of services and products, the Company committed to divest the business of our full range of permanent downhole monitoring systems and related services, which had been part of our Production Enhancement segment. We anticipate the sale of this business line will occur by the end of the first quarter of 2019.

The associated results of operations are separately reported as Discontinued Operations for all periods presented on the Consolidated Statements of Operations. Balance sheet items for this discontinued business, including an allocation of goodwill from the Production Enhancement segment, have been reclassified to Other current assets and Other current liabilities in the Consolidated Balance Sheet. Cash flows from this discontinued business are shown in the table below. As such, the results from continuing operations for the Company and segment highlights for Production Enhancement, exclude these discontinued operations.

Selected data for this discontinued business consisted of the following (in thousands):

	Three Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	427		$	299
Sales revenue	1,179			5,392
Total revenue	1,606			5,691
Cost of services, exclusive of depreciation expense shown below	309			63
Cost of product sales, exclusive of depreciation expense shown below	1,361			3,420
Depreciation and Amortization	44			114
Other Expense	14			42
Operating Income (Loss)	(122		)	2,052
Income tax expense (benefit)	206			297
Income (loss) from discontinued operations, net of income taxes	$	(328	)	$	1,755
	Six Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	902		$	633
Sales revenue	1,710			6,256
Total revenue	2,612			6,889
Cost of services, exclusive of depreciation expense shown below	874			390
Cost of product sales, exclusive of depreciation expense shown below	2,180			4,645
Depreciation and Amortization	102			236
Other Expense (income)	22			(74		)
Operating Income (loss)	(566		)	1,692
Income tax expense (benefit)	108			247
Income (loss) from discontinued operations, net of income taxes	$	(674	)	$	1,445
	June 30, 2018			December 31, 2017
Current assets	$	2,529		$	2,549
Non-current assets	1,861			1,048
Total assets	$	4,390		$	3,597
Current liabilities	$	840		$	221
Non-current liabilities	75			75
Total liabilities	$	915		$	296

Net cash provided by (used in) operating activities of discontinued operations for the three and six months ended June 30, 2018 was $(0.4) million and $0.1 million, respectively.

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Long-Term Debt

6 Months Ended

Jun. 30, 2018

Debt and Capital Lease Obligations [Abstract]

Long-Term Debt

LONG-TERM DEBT

We have no capital lease obligations. Long-term debt is as follows (in thousands):

	June 30, 2018			December 31, 2017
Senior notes	$	150,000		$	150,000
Credit facility	94,000			78,000
Total long-term debt	244,000			228,000
Less: Debt issuance costs	(2,313		)	(1,011		)
Long-term debt, net	$	241,687		$	226,989

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.

On June 19, 2018, we entered into an agreement to amend our revolving credit facility ("Credit Facility"). To appropriately size the facility, the aggregate borrowing commitment has been reduced from $400 million to $300 million. The Credit Facility provides an option to increase the commitment under the Credit Facility by an additional $100 million to bring the total borrowings available to $400 million if certain prescribed conditions are met by the Company. The Credit Facility bears interest at variable rates from LIBOR plus 1.375% to a maximum of LIBOR plus 2.00%. Any outstanding balance under the Credit Facility is due June 19, 2023, 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 $12.8 million at June 30, 2018, resulting in an available borrowing capacity under the Credit Facility of $193.2 million. In addition to those items under the Credit Facility, we had $13.4 million of outstanding letters of credit and performance guarantees and bonds from other sources as of June 30, 2018.

The terms of the Credit Facility, which remained substantially the same, 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 13 - Derivative Instruments and Hedging Activities.

The estimated fair value of total debt at June 30, 2018 and December 31, 2017 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

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Pensions

PENSION

Defined Benefit Plan

We provide a noncontributory defined benefit pension plan covering 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 (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Service cost	$	392		$	366		$	741		$	741
Interest cost	336			268			636			543
Expected return on plan assets	(290		)	(228		)	(549		)	(460		)
Amortization of prior service cost	(18		)	(19		)	(39		)	(38		)
Amortization of actuarial loss	84			110			168			220
Net periodic pension cost	$	504		$	497		$	957		$	1,006

Upon adoption of ASU 2017-07 ("Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost") on January 1, 2018, the service cost component of net periodic pension cost is included in cost of sales and cost of services; the interest cost component of net periodic pension cost is included in the line item "interest expense" in the income statement and all other components of net periodic pension cost are included in the line item "other (income) expense, net" in the income statement. During the six months ended June 30, 2018, we contributed $1.4 million to fund the estimated 2018 premiums on investment contracts held by the Dutch Plan.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

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

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Equity

EQUITY

During the three and six months ended June 30, 2018, we repurchased 5,960 and 36,258 of our common shares for $0.6 million and $4.0 million, respectively. These included rights to 5,960 and 16,258 shares valued at $0.6 million and $1.7 million, respectively, 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 19,903 and 55,589 treasury shares upon vesting of stock-based awards during the three and six months ended June 30, 2018, respectively.

In February and May 2018, we paid a quarterly dividend of $0.55 per share of common stock. In addition, on July 13, 2018, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on July 23, 2018 and payable on August 13, 2018.

The following table summarizes our changes in equity for the six months ended June 30, 2018 (in thousands):

	Common Shares		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity
December 31, 2017	$	1,148	$	54,463	$	173,855		$	(8,353	)	$	(76,269	)	$	3,888	$	148,732
Stock based-awards	—		4,464		—			—			7,928			—		12,392
Repurchase of common shares	—		—		—			—			(3,960		)	—		(3,960		)
Dividends paid	—		—		(48,635		)	—			—			—		(48,635		)
Amortization of deferred pension costs, net of tax	—		—		—			97			—			—		97
Interest rate swaps, net of tax	—		—		—			766			—			—		766
Net income	—		—		48,279			—			—			103		48,382
June 30, 2018	$	1,148	$	58,927	$	173,499		$	(7,490	)	$	(72,301	)	$	3,991	$	157,774

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

	June 30, 2018			December 31, 2017
Prior service cost	$	512		$	541
Unrecognized net actuarial loss	(8,577		)	(8,703		)
Fair value of derivatives, net of tax	575			(191		)
Total accumulated other comprehensive income (loss)	$	(7,490	)	$	(8,353	)

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Earnings per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings per Share

EARNINGS PER SHARE

We compute basic earnings per common share by dividing net income attributable to Core Laboratories N.V. 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		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
Weighted average basic common shares outstanding	44,203	44,164	44,191	44,162
Effect of dilutive securities:
Performance shares	205	148	255	143
Restricted stock	85	62	69	55
Weighted average diluted common and potential common shares outstanding	44,493	44,374	44,515	44,360

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Other (Income) Expense, Net

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

OTHER (INCOME) EXPENSE, NET

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Sale of assets	$	81		$	(123	)	$	(508	)	$	(302	)
Results of non-consolidated subsidiaries	(11		)	(96		)	(69		)	(175		)
Foreign exchange	654			358			1,086			455
Rents and royalties	(141		)	(109		)	(236		)	(231		)
Return on pension assets and other pension costs	(224		)	(137		)	(420		)	(278		)
Severance, compensation and other charges	—			—			—			1,145
Other, net	(176		)	41			187			309
Total other (income) expense, net	$	183		$	(66	)	$	40		$	923

Foreign exchange gains and losses are summarized in the following table (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(Gains) losses by currency	2018			2017			2018			2017
Angolan Kwanza	$	57		$	(4	)	$	161		$	(3	)
Australian Dollar	32			18			110			13
British Pound	104			(74		)	(23		)	(55		)
Canadian Dollar	243			(58		)	357			(77		)
Euro	(259		)	732			(16		)	835
Indonesian Rupiah	142			5			178			(25		)
Other currencies, net	335			(261		)	319			(233		)
Total loss, net	$	654		$	358		$	1,086		$	455

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Income Tax Expense

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Tax Expense

INCOME TAX EXPENSE

The effective tax rates for the three months ended June 30, 2018 and 2017 were 16.6% and 15.0%, respectively, and for the six months ended June 30, 2018 and 2017 were 17.3% and 14.6%, respectively. Income tax expense of $5.0 million in the second quarter of 2018increased by $1.3 million compared to $3.7 million in the same period in 2017, due to the result of several items discrete to each quarter, along with changes in activity levels in jurisdictions with differing tax rates.

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Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

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 1.375% to a maximum of LIBOR plus 2.00%. As a result of two interest rate swap agreements, we are subject to interest rate risk on debt in excess of $50 million drawn on 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 an asset or 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 gain (loss) and are recognized in income as an increase or decrease to interest expense in the period in which the related cash flows being hedged are recognized in expense.

At June 30, 2018, we had fixed rate long-term debt aggregating $200 million and variable rate long-term debt aggregating $44 million, after taking into account the effect of the swaps.

The fair values of outstanding derivative instruments are as follows (in thousands):

	Fair Value of Derivatives
	June 30, 2018		December 31, 2017			Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	205	$	70		Other long-term assets
10 year interest rate swap	344		(492		)	Other long-term assets (liabilities)
	$	549	$	(422	)

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 (in thousands):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018			2017		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	(12	)	$	46	$	(4	)	$	105	Increase (decrease) to interest expense
10 year interest rate swap	37			94		93			202		Increase to interest expense
	$	25		$	140	$	89		$	307

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Financial Instruments

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Financial Instruments

FINANCIAL INSTRUMENTS

The Company's only financial assets and liabilities which are measured at fair value on a recurring basis 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. The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			June 30, 2018
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	47,327	$	—	$	47,327	$	—
5 year interest rate swap	205		—		205		—
10 year interest rate swap	344		—		344		—
	47,876		—		47,876		—
Liabilities:
Deferred compensation plan	$	38,583	$	—	$	38,583	$	—
	$	38,583	$	—	$	38,583	$	—

			Fair Value Measurement at
			December 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	46,145	$	—	$	46,145	$	—
5 year interest rate swap	70		—		70		—
	$	46,215	$	—	$	46,215	$	—
Liabilities:
Deferred compensation plan	$	37,280	$	—	$	37,280	$	—
10 year interest rate swap	492		—		492		—
	$	37,772	$	—	$	37,772	$	—
(1) Deferred compensation assets consist of the cash surrender value of life insurance policies and are intended to assist in the funding of the deferred compensation agreements.

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Segment Reporting

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Reporting

SEGMENT REPORTING

We operate our business in two 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 to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.

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

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		Corporate & Other 1			Consolidated
Three Months Ended June 30, 2018
Revenue from unaffiliated clients	$	102,107	$	73,368	$	—		$	175,475
Inter-segment revenue	73		101		(174		)	—
Segment operating income	14,760		18,427		262			33,449
Total assets (at end of period)	319,122		218,011		67,611			604,744
Capital expenditures	5,384		1,938		150			7,472
Depreciation and amortization	4,290		1,006		572			5,868
Three Months Ended June 30, 2017
Revenue from unaffiliated clients	$	104,313	$	53,899	$	—		$	158,212
Inter-segment revenue	47		249		(296		)	—
Segment operating income (loss)	18,670		8,713		(28		)	27,355
Total assets (at end of period)	319,433		200,583		63,742			583,758
Capital expenditures	2,098		769		46			2,913
Depreciation and amortization	4,528		1,142		518			6,188
Six Months Ended June 30, 2018
Revenue from unaffiliated clients	$	202,916	$	142,577	$	—		$	345,493
Inter-segment revenue	120		152		(272		)	—
Segment operating income	29,517		36,114		134			65,765
Total assets	319,122		218,011		67,611			604,744
Capital expenditures	7,565		3,785		565			11,915
Depreciation and amortization	8,537		2,008		1,141			11,686
Six Months Ended June 30, 2017
Revenue from unaffiliated clients	$	209,208	$	105,613	$	—		$	314,821
Inter-segment revenue	221		450		(671		)	—
Segment operating income (loss)	34,610		17,150		(866		)	50,894
Total assets	319,433		200,583		63,742			583,758
Capital expenditures	4,675		3,789		898			9,362
Depreciation and amortization	9,148		2,306		1,039			12,493

(1) "Corporate & Other" represents those items that are not directly related to a particular segment, eliminations and the assets and liabilities of discontinued operations.

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

RECENT ACCOUNTING PRONOUNCEMENTS

Pronouncements Adopted in 2018

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. We adopted this standard and all related amendments on January 1, 2018. The adoption of this standard did not result in any material changes to our revenue recognition policies and procedures nor to our financial statements. Upon adoption we used the modified retrospective approach; this approach resulted in no cumulative adjustment to retained earnings or net income and no adjustments to prior periods.

In March 2017, the FASB issued ASU 2017-07 ("Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost"), which requires that an employer report the service cost component of net periodic pension cost in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. We adopted this standard on January 1, 2018. We used the practical expedient method which allows us to use the amounts disclosed in our pension footnote for the three and six months ended June 30, 2017 as the estimation basis for applying the retrospective presentation requirements. The adoption of this standard did not result in any material changes to our consolidated financial statements.

Pronouncements Not Yet Effective

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 anticipate the adoption of this standard will have a material impact on our Consolidated Balance Sheets, increasing both asset balances and liability balances; however, there should not be a material impact to our Consolidated Statement of Operations.

In June 2016, the FASB issued ASU 2016-13 ("Measurement of Credit Losses on Financial Instruments") which replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years with early adoption permitted in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are evaluating the impact that the adoption of this standard will have on our consolidated financial statements.

In February 2018, the FASB issued ASU 2018-02 ("Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income"), which provides companies with an option to reclassify stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act ("TCJA") from accumulated other comprehensive income to retained earnings. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years with early adoption permitted, and would be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the tax rate as a result of TCJA is recognized. We do not expect the adoption of this standard to have a material impact on our consolidated financial statements.

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Significant Accounting Policies Update (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Accounting Pronouncements

Revenue Recognition

All of our revenue is derived from contracts with clients and is reported as revenue in the Consolidated Statements of Operations. Our contracts generally include standard commercial payment terms generally acceptable in each region, and do not include financing with extended payment terms. We have no significant obligations for refunds, warranties, or similar obligations. Our revenue does not include taxes collected from our customers. In certain circumstances we apply the guidance in Accounting Standards Codification Topic 606 - Revenue From Contracts with Customers ("Topic 606") to a portfolio of contracts with similar characteristics. We use estimates and assumptions when accounting for a portfolio that reflect the size and composition of the portfolio of contracts.

A performance obligation is a promise in a contract to transfer a distinct service or good to a client, and is the unit of account under Topic 606. We have contracts with two general groups of performance obligations: those that require us to perform analysis and/or diagnostic tests in our laboratory or at the client's wellsite and those from the sale of tools, diagnostic and equipment products and related services. We recognize revenue at an amount that reflects the consideration expected to be received in exchange for such services or goods as described below by applying the five-step method to: (1) identify the contract(s) with clients; (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) we satisfy the performance obligation(s).

Services Revenue: We provide a variety of services to clients in the oil and gas industry. Where services are provided related to the testing and analysis of rock and fluids, we recognize revenue upon the provision of the test results or analysis to the client. For our design, field engineering and completion diagnostic services, we recognize revenue upon the delivery of those services at the well site or delivery of diagnostic data. In the case of our consortia studies, we have multiple performance obligations and revenue is recognized at the point in time when the testing and analysis results on each contributed core are made available to our consortia members. We conduct testing and provide analysis services in support of our consortia studies recognizing revenue as the testing and analysis results are made available to our consortia members.

Product Sales Revenue: We manufacture equipment that we sell to our clients in the oil and gas industry. Revenue is recognized when title to that equipment passes to the client, which is typically when the product is shipped to the client or picked up by the client at our facilities, as set out in the contract.

For arrangements that include multiple performance obligations, we allocate revenue to each performance obligation based on estimates of the price that we would charge the client for each promised service or product if it were sold on a standalone basis.

To a lesser extent in all of our business segments, we enter into other types of contracts including service arrangements and non-subscription software and licensing agreements. We recognize revenue for these arrangements over time or at a point in time depending on our evaluation of when the client obtains control of the promised services or products.

Contract Assets and Liabilities

Contract assets and liabilities result due to the timing of revenue recognition, billings and cash collections.

Contract assets include our right to payment for goods and services already transferred to a customer when the right to payment is conditional on something other than the passage of time, for example contracts where we recognize revenue over time but do not have a contractual right to payment until we complete the performance obligations. Contract assets are included in our accounts receivable and are not material as of June 30, 2018.

Contract liabilities consist of advance payments received and billings in excess of revenue recognized. We generally receive up-front payments relating to our consortia studies; we recognize revenue over the life of the study as the testing and analysis results are made available to our consortia members. We record billings in excess of revenue recognized for contracts with a duration less than twelve months as unearned revenue. We classify contract liabilities for contracts with a duration greater than twelve months as current or non-current based on the timing of when we expect to recognize revenue. The current portion of contract liabilities is included in unearned revenue and the non-current portion of contract liabilities is included in long-term contract liabilities in our consolidated balance sheet. The total balance of our contract liabilities at June 30, 2018 and December 31, 2017 was $9.2 million and $6.7 million, respectively.

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Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Finished goods	$	25,200	$	21,668
Parts and materials	11,476		10,613
Work in progress	3,179		1,036
Total inventories	$	39,855	$	33,317

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Contract Assets and Contract Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The balance of contract assets and contract liabilities consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Contract assets
Current	$	673	$	325
Contract Liabilities
Current	$	4,538	$	2,252
Non-current	4,664		4,442
	$	9,202	$	6,694

	June 30, 2018
Estimate of when contract liabilities will be recognized
within 12 months	$	4,538
within 12 to 24 months	3,988
greater than 24 months	676

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Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations

Selected data for this discontinued business consisted of the following (in thousands):

	Three Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	427		$	299
Sales revenue	1,179			5,392
Total revenue	1,606			5,691
Cost of services, exclusive of depreciation expense shown below	309			63
Cost of product sales, exclusive of depreciation expense shown below	1,361			3,420
Depreciation and Amortization	44			114
Other Expense	14			42
Operating Income (Loss)	(122		)	2,052
Income tax expense (benefit)	206			297
Income (loss) from discontinued operations, net of income taxes	$	(328	)	$	1,755
	Six Months Ended
	June 30, 2018			June 30, 2017
Service revenue	$	902		$	633
Sales revenue	1,710			6,256
Total revenue	2,612			6,889
Cost of services, exclusive of depreciation expense shown below	874			390
Cost of product sales, exclusive of depreciation expense shown below	2,180			4,645
Depreciation and Amortization	102			236
Other Expense (income)	22			(74		)
Operating Income (loss)	(566		)	1,692
Income tax expense (benefit)	108			247
Income (loss) from discontinued operations, net of income taxes	$	(674	)	$	1,445
	June 30, 2018			December 31, 2017
Current assets	$	2,529		$	2,549
Non-current assets	1,861			1,048
Total assets	$	4,390		$	3,597
Current liabilities	$	840		$	221
Non-current liabilities	75			75
Total liabilities	$	915		$	296

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Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt and Capital Lease Obligations [Abstract]

Schedule of Long-term Debt Instruments

We have no capital lease obligations. Long-term debt is as follows (in thousands):

	June 30, 2018			December 31, 2017
Senior notes	$	150,000		$	150,000
Credit facility	94,000			78,000
Total long-term debt	244,000			228,000
Less: Debt issuance costs	(2,313		)	(1,011		)
Long-term debt, net	$	241,687		$	226,989

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Pensions (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table summarizes the components of net periodic pension cost under the Dutch Plan (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Service cost	$	392		$	366		$	741		$	741
Interest cost	336			268			636			543
Expected return on plan assets	(290		)	(228		)	(549		)	(460		)
Amortization of prior service cost	(18		)	(19		)	(39		)	(38		)
Amortization of actuarial loss	84			110			168			220
Net periodic pension cost	$	504		$	497		$	957		$	1,006

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Equity (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of Stockholders Equity

The following table summarizes our changes in equity for the six months ended June 30, 2018 (in thousands):

	Common Shares		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest		Total Equity
December 31, 2017	$	1,148	$	54,463	$	173,855		$	(8,353	)	$	(76,269	)	$	3,888	$	148,732
Stock based-awards	—		4,464		—			—			7,928			—		12,392
Repurchase of common shares	—		—		—			—			(3,960		)	—		(3,960		)
Dividends paid	—		—		(48,635		)	—			—			—		(48,635		)
Amortization of deferred pension costs, net of tax	—		—		—			97			—			—		97
Interest rate swaps, net of tax	—		—		—			766			—			—		766
Net income	—		—		48,279			—			—			103		48,382
June 30, 2018	$	1,148	$	58,927	$	173,499		$	(7,490	)	$	(72,301	)	$	3,991	$	157,774

Schedule of Accumulated Other Comprehensive Income (Loss)

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

	June 30, 2018			December 31, 2017
Prior service cost	$	512		$	541
Unrecognized net actuarial loss	(8,577		)	(8,703		)
Fair value of derivatives, net of tax	575			(191		)
Total accumulated other comprehensive income (loss)	$	(7,490	)	$	(8,353	)

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

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		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
Weighted average basic common shares outstanding	44,203	44,164	44,191	44,162
Effect of dilutive securities:
Performance shares	205	148	255	143
Restricted stock	85	62	69	55
Weighted average diluted common and potential common shares outstanding	44,493	44,374	44,515	44,360

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Other (Income) Expense, Net (Tables)

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Foreign Currency Gains Losses By Currency

Foreign exchange gains and losses are summarized in the following table (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(Gains) losses by currency	2018			2017			2018			2017
Angolan Kwanza	$	57		$	(4	)	$	161		$	(3	)
Australian Dollar	32			18			110			13
British Pound	104			(74		)	(23		)	(55		)
Canadian Dollar	243			(58		)	357			(77		)
Euro	(259		)	732			(16		)	835
Indonesian Rupiah	142			5			178			(25		)
Other currencies, net	335			(261		)	319			(233		)
Total loss, net	$	654		$	358		$	1,086		$	455

Schedule of Other Operating Cost and Expense, by Component

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Sale of assets	$	81		$	(123	)	$	(508	)	$	(302	)
Results of non-consolidated subsidiaries	(11		)	(96		)	(69		)	(175		)
Foreign exchange	654			358			1,086			455
Rents and royalties	(141		)	(109		)	(236		)	(231		)
Return on pension assets and other pension costs	(224		)	(137		)	(420		)	(278		)
Severance, compensation and other charges	—			—			—			1,145
Other, net	(176		)	41			187			309
Total other (income) expense, net	$	183		$	(66	)	$	40		$	923

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Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Liabilities at Fair Value

The fair values of outstanding derivative instruments are as follows (in thousands):

	Fair Value of Derivatives
	June 30, 2018		December 31, 2017			Balance Sheet Classification
Derivatives designated as hedges:
5 year interest rate swap	$	205	$	70		Other long-term assets
10 year interest rate swap	344		(492		)	Other long-term assets (liabilities)
	$	549	$	(422	)

Derivative Instruments, Gain (Loss)

The effect of the interest rate swaps on the Consolidated Statement of Operations was as follows (in thousands):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018			2017		Income Statement Classification
Derivatives designated as hedges:
5 year interest rate swap	$	(12	)	$	46	$	(4	)	$	105	Increase (decrease) to interest expense
10 year interest rate swap	37			94		93			202		Increase to interest expense
	$	25		$	140	$	89		$	307

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Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			June 30, 2018
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	47,327	$	—	$	47,327	$	—
5 year interest rate swap	205		—		205		—
10 year interest rate swap	344		—		344		—
	47,876		—		47,876		—
Liabilities:
Deferred compensation plan	$	38,583	$	—	$	38,583	$	—
	$	38,583	$	—	$	38,583	$	—

			Fair Value Measurement at
			December 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	46,145	$	—	$	46,145	$	—
5 year interest rate swap	70		—		70		—
	$	46,215	$	—	$	46,215	$	—
Liabilities:
Deferred compensation plan	$	37,280	$	—	$	37,280	$	—
10 year interest rate swap	492		—		492		—
	$	37,772	$	—	$	37,772	$	—
(1) Deferred compensation assets consist of the cash surrender value of life insurance policies and are intended to assist in the funding of the deferred compensation agreements.

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2018

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		Corporate & Other 1			Consolidated
Three Months Ended June 30, 2018
Revenue from unaffiliated clients	$	102,107	$	73,368	$	—		$	175,475
Inter-segment revenue	73		101		(174		)	—
Segment operating income	14,760		18,427		262			33,449
Total assets (at end of period)	319,122		218,011		67,611			604,744
Capital expenditures	5,384		1,938		150			7,472
Depreciation and amortization	4,290		1,006		572			5,868
Three Months Ended June 30, 2017
Revenue from unaffiliated clients	$	104,313	$	53,899	$	—		$	158,212
Inter-segment revenue	47		249		(296		)	—
Segment operating income (loss)	18,670		8,713		(28		)	27,355
Total assets (at end of period)	319,433		200,583		63,742			583,758
Capital expenditures	2,098		769		46			2,913
Depreciation and amortization	4,528		1,142		518			6,188
Six Months Ended June 30, 2018
Revenue from unaffiliated clients	$	202,916	$	142,577	$	—		$	345,493
Inter-segment revenue	120		152		(272		)	—
Segment operating income	29,517		36,114		134			65,765
Total assets	319,122		218,011		67,611			604,744
Capital expenditures	7,565		3,785		565			11,915
Depreciation and amortization	8,537		2,008		1,141			11,686
Six Months Ended June 30, 2017
Revenue from unaffiliated clients	$	209,208	$	105,613	$	—		$	314,821
Inter-segment revenue	221		450		(671		)	—
Segment operating income (loss)	34,610		17,150		(866		)	50,894
Total assets	319,433		200,583		63,742			583,758
Capital expenditures	4,675		3,789		898			9,362
Depreciation and amortization	9,148		2,306		1,039			12,493

(1) "Corporate & Other" represents those items that are not directly related to a particular segment, eliminations and the assets and liabilities of discontinued operations.

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Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 25,200	$ 21,668
Parts and materials	11,476	10,613
Work in progress	3,179	1,036
Total inventories	$ 39,855	$ 33,317

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Significant Accounting Policies Update (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Contract with Customer, Asset, Net, Current	$ 673	$ 325
Contract with Customer, Liability, Current	4,538	2,252
CONTRACT LIABILITIES	9,202	6,694
CONTRACT LIABILITIES	$ 4,664	$ 4,442

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Contract Assets and Contract Liabilities - Changes in Net Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
CONTRACT LIABILITIES	$ 4,664	$ 4,442

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Contract Assets and Contract Liabilities - Current and Long-term Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
CONTRACT LIABILITIES	$ 9,202	$ 6,694
Contract with Customer, Liability, Current	(4,538)	$ (2,252)
within 12 to 24 months
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
CONTRACT LIABILITIES	3,988
greater than 24 months
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
CONTRACT LIABILITIES	$ 676

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Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Service revenue	$ 427	$ 299	$ 902	$ 633
Sales revenue	1,179	5,392	1,710	6,256
Total revenue	1,606	5,691	2,612	6,889
Cost of services, exclusive of depreciation expense shown below	309	63	874	390
Cost of product sales, exclusive of depreciation expense shown below	1,361	3,420	2,180	4,645
Depreciation and Amortization	44	114	102	236
Other Expense	14	42	22	(74)
Operating Income (Loss)	(122)	2,052	(566)	1,692
Income tax expense (benefit)	206	297	108	247
Income (loss) from discontinued operations, net of income taxes	(328)	1,755	(674)	1,445
Current assets	2,529	2,549	2,529	2,549
Non-current assets	1,861	1,048	1,861	1,048
Total assets	4,390	3,597	4,390	3,597
Current liabilities	840	221	840	221
Non-current liabilities	75	75	75	75
Total liabilities	$ 915	$ 296	915	296
Cash provided by (used in) operating activities, discontinued operations			$ (400)	$ 100

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Long-Term Debt (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) interest_rate_swap
Debt Instrument [Line Items]
Long-term Debt	$ 244,000	$ 228,000
Less: Debt issuance costs	(2,313)	(1,011)
Long-term debt, net	241,687	226,989
Line of Credit Facility, Prior Borrowing Capacity	400,000
Line of credit facility, current borrowing capacity	300,000
Line of Credit Facility, Extension Capacity	100,000
Line of credit facility, maximum borrowing capacity	400,000
Performance bonds under credit facility	12,800
Line of credit facility, remaining borrowing capacity	193,200
Performance bonds	$ 13,400
Number of interest rate swaps | interest_rate_swap			2
Minimum Interest Coverage Ratio	300.00%
Maximum Leverage Ratio	250.00%
Senior Notes
Debt Instrument [Line Items]
Long-term Debt	$ 150,000	150,000
Face amount	150,000
Line of Credit
Debt Instrument [Line Items]
Long-term Debt	$ 94,000	$ 78,000
Maturity date	Jun. 19, 2023
Senior Notes Series A
Debt Instrument [Line Items]
Face amount	$ 75,000
Interest rate, effective percentage	4.01%
Maturity date	Sep. 30, 2021
Senior Notes Series B
Debt Instrument [Line Items]
Face amount	$ 75,000
Interest rate, effective percentage	4.11%
Maturity date	Sep. 30, 2023
Interest Rate Swap
Debt Instrument [Line Items]
Notional amount			$ 50,000
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Debt Instrument [Line Items]
Derivative, basis spread on variable rate	1.38%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Debt Instrument [Line Items]
Derivative, basis spread on variable rate	2.00%

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Pensions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 392	$ 366	$ 741	$ 741
Interest cost	336	268	636	543
Expected return on plan assets	(290)	(228)	(549)	(460)
Amortization of prior service cost	18	19	39	38
Amortization of actuarial loss	84	110	168	220
Net periodic pension cost	$ 504	$ 497	957	$ 1,006
Contributions by employer			$ 1,400

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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Treasury stock, shares, acquired	5,960		36,258
Treasury stock, value	$ 0.6		$ 4.0
Treasury shares, acquired, tax burden	5,960		16,258
Treasury shares, acquired, value, tax burden	$ 0.6		$ 1.7
Treasury stock reissued	19,903		55,589
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.55	$ 1.10	$ 1.10
Dividends declared (in dollars per share)	$ 0.55

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Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 148,732
Stock based-awards			12,392
Repurchase of common shares			(3,960)
Dividends paid			(48,635)
Amortization of deferred pension costs, net of tax			97
Interest rate swaps, net of tax			766
Net income	$ 24,805	$ 22,709	48,382	$ 40,391
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	53	$ 19	103	$ 43
Ending balance	157,774		157,774
Common Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,148
Stock based-awards			0
Repurchase of common shares			0
Dividends paid			0
Amortization of deferred pension costs, net of tax			0
Interest rate swaps, net of tax			0
Net income			0
Ending balance	1,148		1,148
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			54,463
Stock based-awards			4,464
Repurchase of common shares			0
Dividends paid			0
Amortization of deferred pension costs, net of tax			0
Interest rate swaps, net of tax			0
Net income			0
Ending balance	58,927		58,927
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			173,855
Stock based-awards			0
Repurchase of common shares			0
Dividends paid			(48,635)
Amortization of deferred pension costs, net of tax			0
Interest rate swaps, net of tax			0
Net income			48,279
Ending balance	173,499		173,499
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(8,353)
Stock based-awards			0
Repurchase of common shares			0
Dividends paid			0
Amortization of deferred pension costs, net of tax			97
Interest rate swaps, net of tax			766
Net income			0
Ending balance	(7,490)		(7,490)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(76,269)
Stock based-awards			7,928
Repurchase of common shares			(3,960)
Dividends paid			0
Amortization of deferred pension costs, net of tax			0
Interest rate swaps, net of tax			0
Net income			0
Ending balance	(72,301)		(72,301)
Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			3,888
Stock based-awards			0
Repurchase of common shares			0
Dividends paid			0
Amortization of deferred pension costs, net of tax			0
Interest rate swaps, net of tax			0
Ending balance	$ 3,991		$ 3,991

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Equity (Comprehensive Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Equity [Abstract]
Prior service cost	$ 512	$ 541
Unrecognized net actuarial loss	(8,577)	(8,703)
Fair value of derivatives, net of tax	575	(191)
Total accumulated other comprehensive income (loss)	$ (7,490)	$ (8,353)

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Earnings per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding	44,203	44,164	44,191	44,162
Performance shares (in shares)	205	148	255	143
Restricted stock (in shares)	85	62	69	55
Weighted average diluted common and potential common shares outstanding	44,493	44,374	44,515	44,360

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Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement Location [Line Items]
Total other (income) expense, net	$ 183	$ (66)	$ 40	$ 923
Sale of assets
Income Statement Location [Line Items]
Total other (income) expense, net	81	(123)	(508)	(302)
Other, net
Income Statement Location [Line Items]
Total other (income) expense, net	(176)	41	187	309
Foreign exchange
Income Statement Location [Line Items]
Total other (income) expense, net	654	358	1,086	455
Rents and royalties
Income Statement Location [Line Items]
Total other (income) expense, net	(141)	(109)	(236)	(231)
Severance, compensation and other charges
Income Statement Location [Line Items]
Total other (income) expense, net	0	0	0	1,145
Investment Income [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	$ (11)	$ (96)	$ (69)	$ (175)

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Other (Income) Expense, Net (Foreign Currency (Gain) Loss by Currency) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Foreign exchange	$ 654,000	$ 358,000	$ 1,086,000	$ 455,000
Angola, Kwanza
Foreign exchange	57,000	(4,000)	161,000	(3,000)
AustralianDollar [Member]
Foreign exchange	32,000	18,000	110,000	13,000
British Pound
Foreign exchange	104,000	(74,000)	(23,000)	(55,000)
Canadian Dollar
Foreign exchange	243,000	(58,000)	357,000	(77,000)
Euro
Foreign exchange	(259,000)	732,000	(16,000)	835,000
Other Currencies Net [Member]
Foreign exchange	335,000	(261,000)	319,000	(233,000)
Indonesian Rupiah [Member]
Foreign exchange	$ 142,000	$ 5,000	$ 178,000	$ (25,000)

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Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	17.00%	15.00%	17.00%	15.00%
Change in income tax expense	$ 1,300
Income tax expense	$ 5,020	$ 3,709	$ 10,293	$ 6,638

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Derivative Instruments and Hedging Activities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) interest_rate_swap
Derivatives, Fair Value [Line Items]
Number of interest rate swaps | interest_rate_swap			2
Long-term debt, percentage bearing fixed interest, amount	$ 200,000
Long-term debt, percentage bearing variable interest, amount	44,000
5 year interest rate swap
Derivatives, Fair Value [Line Items]
Notional amount	$ 25,000
Fixed interest rate	2.50%
Maturity date	Aug. 29, 2024
Interest rate derivative assets	$ 205
Interest rate derivative liabilities		$ (492)
10 year interest rate swap
Derivatives, Fair Value [Line Items]
Notional amount	$ 25,000
Fixed interest rate	1.73%
Maturity date	Aug. 29, 2019
Interest rate derivative assets	$ 344
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional amount			$ 50,000
Interest rate derivative assets	549
Interest rate derivative liabilities		(422)
Other Noncurrent Liabilities [Member] | Level 2 | 10 year interest rate swap
Derivatives, Fair Value [Line Items]
Interest rate derivative liabilities		(492)
Other Assets [Member] | Level 2 | 5 year interest rate swap
Derivatives, Fair Value [Line Items]
Interest rate derivative assets	205	$ 70
Other Assets [Member] | Level 2 | 10 year interest rate swap
Derivatives, Fair Value [Line Items]
Interest rate derivative assets	$ 344
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Derivatives, Fair Value [Line Items]
Derivative, basis spread on variable rate	1.38%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Derivatives, Fair Value [Line Items]
Derivative, basis spread on variable rate	2.00%

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Derivative Instruments and Hedging Activities - Effect of Interest Rate Swaps on Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
5 year interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps reclassified to earnings	$ 37	$ 94	$ 93	$ 202
10 year interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps reclassified to earnings	(12)	46	(4)	105
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps reclassified to earnings	$ 25	$ 140	$ 89	$ 307

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Financial Instruments FInancial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation assets	$ 47,327	$ 46,145
Assets, fair value	47,876	46,215
Deferred compensation plan	38,583	37,280
Liabilities, fair value	38,583	37,772
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation assets	0	0
Assets, fair value	0	0
Deferred compensation plan	0	0
Liabilities, fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation assets	47,327	46,145
Assets, fair value	47,876	46,215
Deferred compensation plan	38,583	37,280
Liabilities, fair value	38,583	37,772
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation assets	0	0
Assets, fair value	0	0
Deferred compensation plan	0	0
Liabilities, fair value	0	0
5 year interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative assets	205
Interest rate derivative liabilities		$ 492
10 year interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative assets	$ 344

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 175,475	$ 158,212	$ 345,493	$ 314,821
Inter-segment revenue	0	0	0	0
Segment operating income	33,449	27,355	65,765	50,894
Total assets (at end of period)	604,744	583,758	604,744	583,758	$ 584,812
Capital expenditures	7,472	2,913	11,915	9,362
Depreciation and amortization	5,868	6,188	11,686	12,493
Services	122,094	116,940	241,880	237,542
Product sales	53,381	41,272	103,613	77,279
Operating Segments | Reservoir Description
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	102,107	104,313	202,916	209,208
Inter-segment revenue	73	47	120	221
Segment operating income	14,760	18,670	29,517	34,610
Total assets (at end of period)	319,122	319,433	319,122	319,433	319,433
Capital expenditures	5,384	2,098	7,565	4,675
Depreciation and amortization	4,290	4,528	8,537	9,148
Operating Segments | Production Enhancement
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	73,368	53,899	142,577	105,613
Inter-segment revenue	101	249	152	450
Segment operating income	18,427	8,713	36,114	17,150
Total assets (at end of period)	218,011	200,583	218,011	200,583	200,583
Capital expenditures	1,938	769	3,785	3,789
Depreciation and amortization	1,006	1,142	2,008	2,306
Corporate & Other
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0	0	0
Inter-segment revenue	(174)	(296)	(272)	(671)
Segment operating income	262	(28)	134	(866)
Total assets (at end of period)	67,611	63,742	67,611	63,742	$ 63,742
Capital expenditures	150	46	565	898
Depreciation and amortization	$ 572	$ 518	$ 1,141	$ 1,039