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Disclosures About Fair Value Measurements (Financial Assets and Liabilities Not Carried At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	$ 2,653,059	$ 3,721,193
Reported Value Measurement [Member]
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	2,653,059	3,721,193
Estimate of Fair Value Measurement [Member]
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	$ 3,018,830	$ 4,555,770

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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