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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Net income (loss) $ 10,657 $ (4,545)
Pension liability, net of income tax 510 500
Cash flow hedging loss, net of income tax 1,586 (847)
Foreign currency translation adjustment 649 3,968
Comprehensive income (loss) 13,402 (924)
Pension liability, tax 162 293
Cash flow hedging gain (loss), tax $ 505 $ (496)