Stockholders' Equity and Earnings Per Share (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales									$ 650,585	$ 736,364	$ 711,710
Interest expense									5,692	6,924	7,566
Income (loss) before income tax provision (benefit)									34,470	24,799	(76,573)
Income tax benefit									(4,863)	(2,815)	38,455
Net income (loss)	$ 24,131	$ (442)	$ 3,116	$ 2,802	$ 18,091	$ 3,141	$ (275)	$ 1,027	29,607	21,984	(38,118)
Loss (gain) on cash flow hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									(757)	(409)	(898)
Pension and postretirement plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									(688)	(856)	(627)
Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement plan									1,145	1,333	1,015
Prior-service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement plan									(49)	(57)	(75)
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									1,445	1,265	1,525
Reclassification out of accumulated other comprehensive income | Loss (gain) on cash flow hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income tax provision (benefit)									1,176	600	1,387
Income tax benefit									(419)	(191)	(489)
Net income (loss)									757	409	898
Reclassification out of accumulated other comprehensive income | Loss (gain) on cash flow hedging | Foreign currency exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales									(11)	(860)	(108)
Reclassification out of accumulated other comprehensive income | Loss (gain) on cash flow hedging | Interest rate contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									1,187	1,460	1,495
Reclassification out of accumulated other comprehensive income | Pension and postretirement plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income tax provision (benefit)									1,096	1,276	940
Income tax benefit									(408)	(420)	(313)
Net income (loss)									$ 688	$ 856	$ 627