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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Net income $ 1,021 $ 10,657
Pension liability, net of income tax 547 510
Cash flow hedging gain (loss), net of income tax 106 1,586
Foreign currency translation adjustments (578) 649
Comprehensive income 1,096 13,402
Pension liability, tax 173 162
Cash flow hedging gain (loss), tax $ 34 $ 505