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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Net income $ 6,970 $ 5,825 $ 13,686 $ 25,201
Pension liability, net of income tax 546 510 1,639 1,529
Cash flow hedging gain (loss), net of income tax 1,915 1,185 423 6,598
Foreign currency translation adjustments (4,770) (384) (4,240) (5,483)
Comprehensive income 4,661 7,136 11,508 27,845
Pension liability, tax 174 162 521 488
Cash flow hedging gain (loss), tax $ 610 $ 378 $ 135 $ 2,102