Consolidated Statement of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 23,577	$ 17,682
Gain (loss) in fair value of interest rate swaps	646	81
Interest rate swap amounts reclassified to interest expense	64	167
Income taxes on derivatives	(150)	(87)
Total derivatives	560	161
Amortization to net income of prior service cost	(21)	(19)
Amortization to net income of actuarial loss	84	111
Income taxes on pension and other postretirement benefit plans	(15)	(24)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	48	68
Total other comprehensive income	608	229
Comprehensive income	24,185	17,911
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	50	24
Comprehensive income attributable to Core Laboratories N.V.	$ 24,135	$ 17,887