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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Comprehensive Income (Loss) [Abstract]        
Net income $ 1,972 $ 5,687 $ 20,853 $ 25,712
Pension liability, net of income tax 237 461 776 1,383
Pension liability, Tax 138 270 454 812
Cash flow hedging gain (loss), net of income tax 3,566 (2,410) 3,763 96
Cash flow hedging gain (loss), Tax 2,090 (1,412) 2,205 56
Foreign currency translation adjustment (9,948) 3,845 (8,391) (854)
Comprehensive income $ (4,173) $ 7,583 $ 17,001 $ 26,337