Long-Term Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 1,920,873	$ 2,046,418
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	5,294	16,788
Long-term Debt, Current Maturities	0	0
Long-term Debt, Excluding Current Maturities	1,926,167	2,063,206
Combined Credit Agreements [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	149,736	388,150
Senior Secured Second Lien Credit Facility [Member]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	606,593	0
Senior Secured Second Lien Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	194,110	0
Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Senior Notes	10,466	435,851
Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Senior Notes	8,032	579,795
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Senior Notes	293,083	292,622
Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	308,853	0
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Subordinated Long-term Debt, Noncurrent	$ 350,000	$ 350,000

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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Amount borrowed under the credit facility as of the balance sheet date.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Carrying value as of the balance sheet date of collateralized/uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Subordinated debt places a lender in a lien position behind the primary lender of the company.

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