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CONDENSED 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 Comprehensive Income [Abstract]        
Net income $ 15,346 $ 28,410 $ 35,520 $ 40,003
Foreign exchange translation adjustment 4 (17) 3 (18)
Cash-flow hedges (429) 0 (621) 0
Pension obligation adjustments 0 0 0 410
Other comprehensive income (loss), net of tax (425) (17) (618) 392
Comprehensive income $ 14,921 $ 28,393 $ 34,902 $ 40,395