Long-term Debt and Derivatives (Details) (USD $)	Jul. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Long-term Debt
Debt		$ 2,098,136,000	$ 2,171,123,000
Less current maturities of long-term debt		(3,052,000)	(357,927,000)
Long-term debt, net of current maturities		2,095,084,000	1,813,196,000
Senior secured credit facility due October 2012
Long-term Debt
Debt		1,518,125,000	1,589,125,000
$250 million 6 3/4% senior subordinated notes due March 2015
Long-term Debt
Debt	250,000,000	250,000,000	250,000,000
Debt instrument interest rate stated percentage (as a percent)		6.75%	6.75%
Principal amount of long-term debt		250,000,000	250,000,000
$325 million 8 3/4% senior subordinated notes due August 2019
Long-term Debt
Debt		325,000,000	325,000,000
Debt instrument interest rate stated percentage (as a percent)		8.75%	8.75%
Principal amount of long-term debt		325,000,000	325,000,000
Other long-term obligations
Long-term Debt
Debt		1,890,000	3,782,000
Capital leases
Long-term Debt
Debt		$ 3,121,000	$ 3,216,000

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 02
-Paragraph 22
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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-Name Accounting Standards Codification
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