Accumulated Other Comprehensive Income (Loss) (Schedule of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		$ (117,580)	$ (134,005)	$ (120,232)	$ (138,447)
Other comprehensive income (loss)		378	(4,965)	(1,543)	(8,667)
Currency impact		(31)	709	481	3,122
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,491	2,352	4,050	7,084
Amortization of prior service cost (1)	[1]	47	77	142	231
Cost of sales		41	507	1,096	1,666
Interest expense		767		1,778
Current-period other comprehensive income (loss)		2,693	(1,320)	6,004	3,436
Tax effect		(644)	(418)	(1,303)	(732)
Ending balance		(115,531)	(135,743)	(115,531)	(135,743)
Foreign Currency Translation [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(22,587)	(17,471)	(22,913)	(9,162)
Other comprehensive income (loss)		407	(1,265)	459	(9,574)
Amounts reclassified from accumulated other comprehensive income (loss):
Current-period other comprehensive income (loss)		407	(1,265)	459	(9,574)
Tax effect		78	0	352	0
Ending balance		(22,102)	(18,736)	(22,102)	(18,736)
Derivative Instruments [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(3,561)	(295)	(1,860)	(625)
Other comprehensive income (loss)		(29)	(3,700)	(4,757)	(4,487)
Amounts reclassified from accumulated other comprehensive income (loss):
Cost of sales		41	507	1,096	1,666
Interest expense		767		1,778
Current-period other comprehensive income (loss)		779	(3,193)	(1,883)	(2,821)
Tax effect		(278)	(19)	683	(61)
Ending balance		(3,060)	(3,507)	(3,060)	(3,507)
Pension and Other Postretirement Benefits [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(91,432)	(116,239)	(95,459)	(128,660)
Other comprehensive income (loss)		0	0	2,755	5,394
Currency impact		(31)	709	481	3,122
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,491	2,352	4,050	7,084
Amortization of prior service cost (1)	[1]	47	77	142	231
Current-period other comprehensive income (loss)		1,507	3,138	7,428	15,831
Tax effect		(444)	(399)	(2,338)	(671)
Ending balance		$ (90,369)	$ (113,500)	$ (90,369)	$ (113,500)

[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 Condensed Consolidated Statements of Operations.