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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 24,842 $ 38,251 $ 24,466
Foreign currency translation adjustment:      
Unrealized foreign currency translation adjustment (net of tax of $281 in 2018, tax benefit of $371 in 2017 and tax benefit of $729 in 2016) (10,762) 7,792 18,837
Derivative financial instruments adjustment (2,060) (404) 1,236
Pension & other postretirement benefit adjustments:      
Net gains (losses) and prior service costs (net of tax benefit of $319 in 2018, tax benefit of $2,518 in 2017 and tax benefit of $1,874 in 2016) (1,118) (8,634) (3,288)
Amortization of prior service costs and net gains or losses (net of tax of $3,028 in 2018, tax of $4,234 in 2017 and tax of $4,398 in 2016) 10,622 7,811 8,700
Other comprehensive income (loss) (3,318) 6,565 25,485
Comprehensive income (loss) $ 21,524 $ 44,816 $ 49,951