The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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Property, Plant, and Equipment (Details) (USD $)	3 Months Ended
Property, Plant, and Equipment (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property, Plant, and Equipment
Net depreciated value	$ 429,521,000		$ 460,656,000
Provision for depreciation and amortization	49,700,000	11,300,000
Accelerated depreciation on equipment	35,700,000
Property, plant, and equipment
Property, Plant, and Equipment
Property, plant, and equipment, gross	1,084,018,000		1,066,494,000
Less: accumulated depreciation	(671,797,000)		(627,937,000)
Net depreciated value	412,221,000		438,557,000
Buildings
Property, Plant, and Equipment
Property, plant, and equipment, gross	130,367,000		130,250,000
Machinery and equipment
Property, Plant, and Equipment
Property, plant, and equipment, gross	953,651,000		936,244,000
Land
Property, Plant, and Equipment
Net depreciated value	3,428,000		3,391,000
Construction in progress
Property, Plant, and Equipment
Net depreciated value	$ 13,872,000		$ 18,708,000