Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 28,145,000	$ 29,645,000
Buildings	247,274,000	250,157,000
Machinery and equipment	836,193,000	834,699,000
Furniture and fixtures	9,423,000	22,243,000
Computer and other equipment	11,261,000	8,624,000
Software	50,661,000	47,719,000
Property, plant and equipment, gross	1,182,957,000	1,193,087,000
Accumulated depreciation	(743,441,000)	(711,135,000)
Property, plant and equipment, net	439,516,000	481,952,000	507,440,000
Expenditures for maintenance and repairs	20,000,000	20,800,000	19,200,000
Depreciation expense	56,400,000	53,400,000	59,500,000
Software amortization	5,800,000	5,600,000	5,300,000
Capital expenditures and purchased software	27,504,000	31,048,000	41,863,000
Unamortized software cost	$ 27,700,000	$ 30,300,000
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	25
Estimated useful life, maximum	25
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	25
Estimated useful life, maximum	40
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	10
Estimated useful life, maximum	10
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	5
Estimated useful life, maximum	5
Computer and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	3
Estimated useful life, maximum	10
Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum	5
Estimated useful life, maximum	8