Property, Plant, and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, Plant, and Equipment
Net depreciated value	$ 293,882,000		$ 293,882,000		$ 460,656,000
Provision for depreciation and amortization	9,900,000	7,400,000	29,700,000	21,900,000
Continuing operations
Property, Plant, and Equipment
Net depreciated value	293,882,000		293,882,000
Property, plant, and equipment
Property, Plant, and Equipment
Property, plant, and equipment, gross					1,066,494,000
Less: accumulated depreciation					(627,937,000)
Net depreciated value					438,557,000
Property, plant, and equipment | Continuing operations
Property, Plant, and Equipment
Property, plant, and equipment, gross	508,836,000		508,836,000
Less: accumulated depreciation	(237,075,000)		(237,075,000)
Net depreciated value	271,761,000		271,761,000
Buildings
Property, Plant, and Equipment
Property, plant, and equipment, gross					130,250,000
Buildings | Continuing operations
Property, Plant, and Equipment
Property, plant, and equipment, gross	82,422,000		82,422,000
Machinery and equipment
Property, Plant, and Equipment
Property, plant, and equipment, gross					936,244,000
Machinery and equipment | Continuing operations
Property, Plant, and Equipment
Property, plant, and equipment, gross	426,414,000		426,414,000
Land
Property, Plant, and Equipment
Net depreciated value					3,391,000
Land | Continuing operations
Property, Plant, and Equipment
Net depreciated value	1,734,000		1,734,000
Construction in progress
Property, Plant, and Equipment
Net depreciated value					18,708,000
Construction in progress | Continuing operations
Property, Plant, and Equipment
Net depreciated value	$ 20,387,000		$ 20,387,000