Comprehensive Income (Loss) (Schedule of AOCI) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (120,232)	$ (138,447)	$ (73,160)
Other comprehensive income (loss)		(7,579)	(18,038)	(15,108)
Actuarial gain (loss)		(10,560)	21,438	(62,689)
Currency impact		1,271	4,233	4,655
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	5,088	9,426	5,331
Amortization of prior service cost (1)	[1]	196	4,652	2,142
Amortization of transition obligation (1)	[1]			60
Cost of sales		1,129	2,357	(573)
Interest expense		2,399
Current-period other comprehensive income (loss)		(8,056)	24,068	(66,182)
Tax effect		3,091	(5,853)	895
Ending balance		(125,197)	(120,232)	(138,447)
Foreign Currency Translation [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(22,913)	(9,162)	4,554
Other comprehensive income (loss)		(6,244)	(13,751)	(13,716)
Amounts reclassified from accumulated other comprehensive income (loss):
Current-period other comprehensive income (loss)		(6,244)	(13,751)	(13,716)
Tax effect		1,329	0	0
Ending balance		(27,828)	(22,913)	(9,162)
Derivative Instruments [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(1,860)	(625)	1,221
Other comprehensive income (loss)		(1,335)	(4,287)	(1,392)
Amounts reclassified from accumulated other comprehensive income (loss):
Cost of sales		1,129	2,357	(573)
Interest expense		2,399
Current-period other comprehensive income (loss)		2,193	(1,930)	(1,965)
Tax effect		(848)	695	119
Ending balance		(515)	(1,860)	(625)
Pension and Other Postretirement Benefits [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(95,459)	(128,660)	(78,935)
Other comprehensive income (loss)		0	0	0
Actuarial gain (loss)		(10,560)	21,438	(62,689)
Currency impact		1,271	4,233	4,655
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	5,088	9,426	5,331
Amortization of prior service cost (1)	[1]	196	4,652	2,142
Amortization of transition obligation (1)	[1]			60
Current-period other comprehensive income (loss)		(4,005)	39,749	(50,501)
Tax effect		2,610	(6,548)	776
Ending balance		$ (96,854)	$ (95,459)	$ (128,660)

[1] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost within the cost of sales and selling, general and administrative expenses on the Consolidated Statements of Operations.