Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property, Plant and Equipment (Details) (USD $)	12 Months Ended
Property, Plant and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,259,819,000us-gaap_PropertyPlantAndEquipmentGross	$ 1,311,990,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(864,706,000)	(893,160,000)
Property, plant and equipment, net	395,113,000us-gaap_PropertyPlantAndEquipmentNet	418,830,000us-gaap_PropertyPlantAndEquipmentNet	420,154,000us-gaap_PropertyPlantAndEquipmentNet
Expenditures for maintenance and repairs	17,400,000	17,500,000	17,000,000
Depreciation expense	56,575,000us-gaap_Depreciation	57,182,000us-gaap_Depreciation	56,769,000us-gaap_Depreciation
Software amortization	6,200,000	6,000,000	5,800,000
Capital expenditures and purchased software	58,873,000	64,457,000	37,207,000
Unamortized software cost	13,800,000us-gaap_CapitalizedComputerSoftwareNet	19,200,000us-gaap_CapitalizedComputerSoftwareNet
Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		71,116,000
Accumulated depreciation and amortization		(71,116,000)
Property, plant and equipment, net
As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,240,874,000
Accumulated depreciation and amortization		(822,044,000)
Property, plant and equipment, net		418,830,000
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,967,000	25,321,000
Estimated useful life	25 years
Land and Land Improvements [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		(1,760,000)
Land and Land Improvements [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		27,081,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	225,094,000	236,963,000
Buildings [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		(3,886,000)
Buildings [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		240,849,000
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]
Property, plant and equipment, gross	940,764,000	980,055,000
Estimated useful life	10 years
Machinery and Equipment [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		77,018,000
Machinery and Equipment [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		903,037,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,716,000	7,465,000
Estimated useful life	5 years
Furniture and Fixtures [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		647,000
Furniture and Fixtures [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		6,818,000
Computer and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,692,000	12,086,000
Computer and Other Equipment [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		(757,000)
Computer and Other Equipment [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		12,843,000
Computer and Other Equipment [Member] \| Minimum [Member] \| As Previously Reported [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]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50,586,000	50,100,000
Software [Member] \| Error Correction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		(146,000)
Software [Member] \| As Previously Reported [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 50,246,000
Software [Member] \| Minimum [Member] \| As Previously Reported [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