Long-Term Debt (Schedule of Maturities of Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Long-term Debt, Fiscal Year Maturity
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 89,911
Long-term Debt, Maturities, Repayments of Principal in Year Two	666,303
Long-term Debt, Maturities, Repayments of Principal in Year Three	151,566
Long-term Debt, Maturities, Repayments of Principal in Year Four	488,645
Long-term Debt, Maturities, Repayments of Principal in Year Five	3,287,628
Long-term Debt, Maturities, Repayments of Principal after Year Five	4,834,423
Total maturities	9,518,476
Unamortized Note Premium	22,829
Long-term Debt, Total	$ 9,541,305

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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

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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, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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