Comprehensive Income (Loss) (Schedule of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (141,040)		$ (128,372)
Other comprehensive income (loss)	6,972		925
Actuarial gain (loss)	47,704		(37,004)
Prior service cost			2,672
Currency impact	(298)		(749)
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	(12,185)	[1]	(11,808)	[1]
Amortization of prior service cost (1)	1,476	[1]	3,006	[1]
Amortization of transition obligation (1)	84	[1]	102	[1]
Cost of sales	(57)		(4,707)
Current-period other comprehensive income (loss)	68,180		(14,533)
Tax effect	(300)		1,865
Ending balance	(73,160)		(141,040)
Foreign Currency Translation [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,641)		(4,005)
Other comprehensive income (loss)	6,195		2,364
Amounts reclassified from accumulated other comprehensive income (loss):
Current-period other comprehensive income (loss)	6,195		2,364
Tax effect	0		0
Ending balance	4,554		(1,641)
Derivative Instruments [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	489		(2,370)
Other comprehensive income (loss)	777		(1,439)
Amounts reclassified from accumulated other comprehensive income (loss):
Cost of sales	(57)		(4,707)
Current-period other comprehensive income (loss)	834		3,268
Tax effect	(102)		(409)
Ending balance	1,221		489
Pension and Other Postretirement Benefits [Member]
Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(139,888)		(121,997)
Other comprehensive income (loss)	0		0
Actuarial gain (loss)	47,704		(37,004)
Prior service cost			2,672
Currency impact	(298)		(749)
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	(12,185)	[1]	(11,808)	[1]
Amortization of prior service cost (1)	1,476	[1]	3,006	[1]
Amortization of transition obligation (1)	84	[1]	102	[1]
Current-period other comprehensive income (loss)	61,151		(20,165)
Tax effect	(198)		2,274
Ending balance	$ (78,935)		$ (139,888)

[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.