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Property, Plant, and Equipment (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Property, Plant, and Equipment
Gross property, plant and equipment	$ 2,241,255,000		$ 2,241,255,000		$ 2,151,286,000
Accumulated depreciation	539,950,000		539,950,000		478,325,000
Property, plant, and equipment, net of accumulated depreciation	1,701,305,000		1,701,305,000		1,672,961,000
Capitalized interest	2,300,000	800,000	4,300,000	900,000
Original carrying value of assets under capital lease obligations	25,100,000	300,000	25,100,000	300,000
Land and improvements
Property, Plant, and Equipment
Gross property, plant and equipment	27,674,000		27,674,000		26,136,000
Buildings
Property, Plant, and Equipment
Gross property, plant and equipment	37,583,000		37,583,000		37,289,000
Machinery and equipment
Property, Plant, and Equipment
Gross property, plant and equipment	2,013,055,000		2,013,055,000		1,967,269,000
Automotive equipment
Property, Plant, and Equipment
Gross property, plant and equipment	10,618,000		10,618,000		10,217,000
Furniture and fixtures
Property, Plant, and Equipment
Gross property, plant and equipment	12,844,000		12,844,000		12,349,000
Leasehold improvements
Property, Plant, and Equipment
Gross property, plant and equipment	1,979,000		1,979,000		1,445,000
Railcars
Property, Plant, and Equipment
Gross property, plant and equipment	2,496,000		2,496,000		2,496,000
Construction in progress
Property, Plant, and Equipment
Gross property, plant and equipment	$ 135,006,000		$ 135,006,000		$ 94,085,000

X

- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

Property, plant, or equipment held under lease agreements classified as an asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 1, 10, 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Total interest costs incurred during the period that are capitalized.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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