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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]            
Net income $ 5,695   $ 8,719   $ 6,716 $ 19,376
Pension liability, net of income tax 546   510   1,093 1,020
Cash flow hedging gain (loss), net of income tax (1,598)   3,827   (1,492) 5,413
Foreign currency translation adjustments 1,108   (5,749)   530 (5,100)
Comprehensive income 5,751   7,307   6,847 20,709
Pension liability, tax 174 $ 173 162 $ 162 347 324
Cash flow hedging gain (loss), tax $ (509) $ 34 $ 1,219 $ 505 $ (475) $ 1,724