Indebtedness (Schedule Of Indebtedness) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2004
Debt Instrument [Line Items]
Term loan	$ 323,750,000
Revolving credit facility	92,103,000
Aircraft financing		32,881,000
Total debt	1,903,653,000	1,680,106,000
Less: current maturities	(29,264,000)	(133,451,000)
Long-term debt	1,874,389,000	1,546,655,000
7 3/4% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Senior Notes	94,401,000	94,346,000
Debt discount	99,000	154,000
Interest rate	7.75%	7.75%
7% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Senior Notes	312,463,000	312,585,000
Debt premium	218,000	340,000
Interest rate	7.00%	7.00%
7 1/8% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Senior Notes	423,140,000	478,000,000
Interest rate	7.125%	7.125%
8 1/8% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Senior Notes	454,385,000	474,563,000
Debt discount	4,256,000	5,437,000
Interest rate	8.125%	8.125%
3 3/4% Convertible Senior Subordinated Notes Due 2014 [Member]
Debt Instrument [Line Items]
Convertible Senior Subordinated Notes	97,581,000	97,581,000	350,000,000
Interest rate	3.75%	3.75%	3.75%
8.65% Junior Subordinated Deferrable Interest Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Junior Subordinated Deferrable Interest Debentures	88,204,000	89,554,000
Interest rate	8.65%	8.65%
Capital Lease [Member]
Debt Instrument [Line Items]
Capital leases	5,301,000	57,000
Weighted-average interest rate	5.70%
Other Debt [Member]
Debt Instrument [Line Items]
Other	$ 12,325,000	$ 100,539,000
Weighted-average interest rate	0.20%

Aircraft financing

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Term Loans Outstanding

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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.

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The portion of the carrying value of convertible subordinated debt as of the balance sheet date that is scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Interest rate stated in the contractual debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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 (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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