Indebtedness (Schedule Of Indebtedness) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2004
Debt Instrument [Line Items]
Term loan	$ 296,000,000	$ 323,750,000
Revolving credit facility	91,403,000	92,103,000
Total debt	1,358,695,000	1,903,653,000
Less: current maturities	(440,569,000)	(29,264,000)
Long-term debt	918,126,000	1,874,389,000
7 3/4% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Senior Notes	94,461,000	94,401,000
Debt discount	39,000	99,000
Interest rate	7.75%	7.75%
7% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Senior Notes	307,494,000	312,463,000
Debt premium	85,000	218,000
Interest rate	7.00%	7.00%
8 1/8% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Senior Notes	455,405,000	454,385,000
Debt discount	3,236,000	4,256,000
Interest rate	8.125%	8.125%
7 1/8% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Senior Notes		423,140,000
Interest rate		7.125%
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
Interest rate		8.65%
Capital Lease [Member]
Debt Instrument [Line Items]
Capital leases	4,066,000	5,301,000
Weighted-average interest rate	5.20%
Other Debt [Member]
Debt Instrument [Line Items]
Other	$ 12,285,000	$ 12,325,000
Weighted-average interest rate	0.40%

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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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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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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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