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Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Comprehensive Income [Abstract]        
Net income $ 6,139 $ 2,884 $ 1,594 $ 619
Pension liability, net of income tax 501 438 1,001 876
Cash flow hedging loss, net of income tax (1,751) 1,137 (2,598) (1,080)
Foreign currency translation adjustment 5,255 (3,114) 9,223 1,717
Comprehensive income 10,144 1,345 9,220 2,132
Pension liability, tax 293 257 586 514
Cash flow hedging gain (loss), tax $ (1,026) $ 666 $ (1,522) $ (633)