Stockholders' Equity and Earnings Per Share (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales									$ 87,859	$ 98,999	$ 159,230
Interest expense									3,440	4,318	4,962
Income tax expense (benefit)									(639)	9,649	9,510
Net income	$ 10,172	$ 8,398	$ 6,789	$ 4,978	$ 24,131	$ (441)	$ 3,115	$ 2,802	30,337	29,607	21,984
Loss (gain) on cash flow hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									2,369	(757)	(409)
Pension and postretirement plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									(582)	(688)	(856)
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period									(1,787)	1,445	1,265
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) from continuing operations before income tax provision (benefit)									(3,624)	1,176	600
Income tax expense (benefit)									1,255	(419)	(191)
Net income									(2,369)	757	409
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									(158)	(11)	(860)
Reclassification out of accumulated other comprehensive income | Loss (gain) on cash flow hedging | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									(3,466)	1,187	1,460
Reclassification out of accumulated other comprehensive income | Pension and postretirement plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before income tax provision (benefit)									945	1,096	1,276
Income tax expense (benefit)									(363)	(408)	(420)
Net income									582	688	856
Reclassification out of accumulated other comprehensive income | Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement plan									955	1,145	1,333
Reclassification out of accumulated other comprehensive income | Prior-service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement plan									$ (10)	$ (49)	$ (57)