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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ (122) $ (2,560) $ (1,506) $ (2,310)
Derivative financial instruments adjustment, tax (benefit) (92) (31) (1,082) 136
Amortization of prior service costs and net gains or losses, tax $ 1,478 $ 842 $ 4,402 $ 2,836