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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Net income $ 8,719 $ 6,139 $ 19,376 $ 1,594
Pension liability, net of income tax 510 501 1,019 1,001
Cash flow hedging gain (loss), net of income tax 3,827 (1,751) 5,413 (2,598)
Foreign currency translation adjustment (5,749) 5,255 (5,099) 9,223
Comprehensive income 7,307 10,144 20,709 9,220
Pension liability, tax 162 293 325 586
Cash flow hedging gain (loss), tax $ 1,219 $ (1,026) $ 1,724 $ (1,522)