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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Comprehensive Income (Loss) [Abstract]    
Net income (loss) $ (2,265) $ 6,312
Pension liability, net of income tax 438 512
Pension liability, tax 257 300
Cash flow hedging gain (loss), net of income tax (2,217) 1,962
Cash flow hedging gain (loss), tax (1,299) 1,150
Foreign currency translation adjustment 4,831 (12,501)
Comprehensive income (loss) $ 787 $ (3,715)