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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 38,251 $ 24,466 $ (32,135)
Foreign currency translation adjustment:      
Unrealized foreign currency translation adjustment (net of tax benefit of $371 in 2017, tax benefit of $729 in 2016 and tax benefit of $890 in 2015) 7,792 18,837 (65,537)
Derivative financial instruments adjustment (404) 1,236 (1,029)
Pension & other postretirement benefit adjustments:      
Net gains (losses) and prior service costs (net of tax benefit of $2,518 in 2017, tax benefit of $1,874 in 2016 and tax benefit of $226 in 2015) (8,634) (3,288) (2,176)
Amortization of prior service costs and net gains or losses (net of tax of $4,234 in 2017, tax of $4,398 in 2016 and tax of $5,823 in 2015) 7,811 8,700 10,218
Other comprehensive income (loss) 6,565 25,485 (58,524)
Comprehensive income (loss) $ 44,816 $ 49,951 $ (90,659)