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Debt (Summary Of Long-Term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Debt instrument, Principal Balance	$ 5,910,041,000	$ 5,440,073,000
Debt, Carrying value	5,876,607,000	5,356,103,000
4.0% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, Principal Balance	499,944,000	499,987,000
Debt discount	(31,550,000)	(69,236,000)
Debt, Carrying value	$ 468,394,000	$ 430,751,000

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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