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