Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 27,457	$ 24,805	$ 68,014	$ 48,382
Changes in fair value of interest rate swaps	(657)	235	(1,029)	881
Interest rate swap amounts reclassified to interest expense	(45)	25	(94)	89
Income taxes on derivatives	147	(54)	236	(204)
Total derivatives	(555)	206	(887)	766
Prior service cost	(25)	(18)	(50)	(39)
Unrecognized net actuarial loss	14	84	29	168
Income taxes on pension and other postretirement benefit plans	2	(17)	5	(32)
Total pension and other postretirement benefit plans	(9)	49	(16)	97
Total other comprehensive income (loss)	(564)	255	(903)	863
Comprehensive income	26,893	25,060	67,111	49,245
Net income attributable to non-controlling interest	43	53	90	103
Comprehensive income attributable to Core Laboratories N.V.	$ 26,850	$ 25,007	$ 67,021	$ 49,142

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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