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Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Comprehensive Income [Abstract]        
Net income $ 2,884 $ 7,461 $ 619 $ 13,773
Pension liability, net of income tax 438 507 876 1,019
Cash flow hedging gain (loss), net of income tax 1,137 (2,557) (1,080) (595)
Foreign currency translation adjustment (3,114) 3,219 1,717 (9,282)
Comprehensive income 1,345 8,630 2,132 4,915
Pension liability, tax 257 297 514 598
Cash flow hedging gain (loss), tax $ 666 $ (1,499) $ (633) $ (349)