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Debt (Senior Convertible Notes) (Details) (USD $)	3 Months Ended			1 Months Ended
Debt (Senior Convertible Notes) (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Senior Convertible Notes [Member]	Dec. 31, 2011 Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Repayment of debt	$ 673,806,000	$ 1,205,000		$ 600,000,000
Long term debt	5,001,595,000		5,168,226,000		593,983,000
Discount on debt					$ 6,000,000

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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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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