Periodic payments required on debt instrument expressed as the annual aggregate percentage of the principal amount.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Interest rate stated in the contractual debt agreement.

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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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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Amount of the required periodic payments including both interest and principal payments.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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Gross amount of debt extinguished.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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Long-term Debt Instruments (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended		3 Months Ended		1 Months Ended		1 Months Ended				1 Months Ended				1 Months Ended	3 Months Ended
Long-term Debt Instruments (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Sep. 30, 2010 7 7/8% Senior Notes	Nov. 30, 2010 6 5/8% Senior Notes	Dec. 31, 2010 6 5/8% Senior Notes	Jun. 30, 2011 Term Loans - Senior Secured Credit Facility	Nov. 30, 2006 Term Loans - Senior Secured Credit Facility Senior Secured Credit Facility - November 2006	Jul. 31, 2010 Tranche B-1 [Member] Senior Secured Credit Facility - November 2006	May 31, 2011 Tranche B-1 [Member] Incremental Agreement May 2011 - Senior Secured Credit Facility	Jul. 31, 2010 Tranche B-1 [Member]	Jul. 31, 2010 Tranche B-2 [Member] Amendment July 2010 - Senior Secured Credit Facility	Mar. 31, 2011 Tranche B-2 [Member] Amendment March 2011 - Senior Secured Credit Facility	Mar. 31, 2011 Tranche B-3 [Member] Amendment March 2011 - Senior Secured Credit Facility	May 31, 2011 Incremental Tranche B-3 [Member] Incremental Agreement May 2011 - Senior Secured Credit Facility	Nov. 30, 2006 Revolver - Senior Secured Credit Facility Senior Secured Credit Facility - November 2006	Jul. 31, 2010 Revolver - Senior Secured Credit Facility Amendment July 2010 - Senior Secured Credit Facility	Mar. 31, 2011 Revolver - Senior Secured Credit Facility Amendment March 2011 - Senior Secured Credit Facility	Sep. 30, 2010 Amendment July 2010 - Senior Secured Credit Facility
Debt Instrument
Principal Amount					$ 1,000,000,000	$ 1,000,000,000			$ 1,600,000,000						$ 500,000,000	$ 1,000,000,000
Maturity Date					Sep. 01, 2018	Nov. 15, 2020			Nov. 03, 2013			Nov. 03, 2013	Nov. 03, 2016		Mar. 17, 2018	Mar. 17, 2018	Nov. 03, 2011		Mar. 17, 2016
Outstanding Principal Amended													1,000,000,000
Proceeds from Issuance					974,000,000		988,100,000								490,200,000
Debt Issuance Fees					26,000,000	11,900,000									9,800,000	8,300,000
Stated Interest Rate					7.875%	6.625%
Maximum Borrowing Capacity									1,600,000,000								100,000,000	67,500,000	100,000,000
Basis Spread on Variable Rate										2.25%			3.50%	3.821%	3.75%	3.75%
Periodic Payment - Annual Aggregate Percent of Principal									1.00%
Periodic Payment Amount															1,250,000	2,500,000
Extinguishment of Debt, Amount											535,800,000
Loss on extinguishment of debt	9,536,000	0	9,536,000	0							9,500,000									0
Net Proceeds from Issuance and Repayment of Debt																455,900,000
Weighted Average Interest Rate								5.008%
Capital Lease Obligations, Current	7,000,000		7,000,000
Capital Lease Obligations, Noncurrent	$ 264,400,000		$ 264,400,000