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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Total interest costs incurred during the period that are capitalized.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 34

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can 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.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-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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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

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-Name Accounting Standards Codification

-Topic 210

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-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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Property, plant and equipment additions minus disposals plus or minus transfers and other changes equals the increase or decrease in property, plant and equipment for the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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

-Publisher FASB

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-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph b, c

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Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
Property and Equipment (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Plant and equipment
Property and equipment	$ 3,288,007,000		$ 3,288,007,000		$ 2,895,094,000
Less accumulated depreciation	(1,066,540,000)		(1,066,540,000)		(929,320,000)
Property and equipment, net	2,221,467,000		2,221,467,000		1,965,774,000
Depreciation expense	51,800,000	52,300,000	157,600,000	152,700,000
Interest capitalized in connection with major construction projects	1,700,000	1,600,000	3,500,000	4,400,000
Property and equipment increase, total, due primarily to acquisition			392,900,000
Land and improvements
Plant and equipment
Property and equipment	375,377,000		375,377,000		298,482,000
Building and improvements
Plant and equipment
Property and equipment	1,729,986,000		1,729,986,000		1,534,117,000
Furniture, fixtures and equipment
Plant and equipment
Property and equipment	1,004,362,000		1,004,362,000		938,443,000
Leasehold improvements
Plant and equipment
Property and equipment	16,909,000		16,909,000		17,089,000
Construction in progress
Plant and equipment
Property and equipment	$ 161,373,000		$ 161,373,000		$ 106,963,000