Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 26,985,000	$ 28,145,000
Buildings	244,104,000	247,214,000
Machinery and equipment	863,811,000	831,974,000
Furniture and fixtures	7,249,000	9,211,000
Computer and other equipment	11,946,000	11,237,000
Software	47,576,000	50,673,000
Property, plant and equipment, gross	1,201,671,000	1,178,454,000
Accumulated depreciation	(781,517,000)	(739,501,000)
Property, plant and equipment, net	420,154,000	438,953,000	480,711,000
Expenditures for maintenance and repairs	17,000,000	20,000,000	20,800,000
Depreciation expense	56,600,000	56,100,000	53,000,000
Software amortization	5,800,000	5,800,000	5,600,000
Capital expenditures and purchased software	37,207,000	27,428,000	30,957,000
Unamortized software cost	$ 22,400,000	$ 27,700,000
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	35 years
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer and Other Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer and Other Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years