Debt (Senior Notes) (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long term debt	$ 5,001,595,000	$ 5,168,226,000
2018 Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt	827,923,000	818,774,000
Discount on debt	10,700,000	11,000,000
Variable interest rate of debt	3.46%
Mark to market adjustment	38,600,000	29,800,000
2020 Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt	1,014,332,000	1,014,643,000
Premium on debt	14,300,000	14,600,000
Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Long term debt		593,983,000
Discount on debt		6,000,000
Senior Notes And Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument fair value	2,560,000,000	3,150,000,000
Cash Convertible Notes [Member]
Debt Instrument [Line Items]
Long term debt	994,329,000	937,160,000
Discount on debt	92,300,000	97,800,000
Debt instrument fair value	1,080,000,000	1,000,000,000
Interest Rate Swap [Member] \| 2018 Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt	$ 500,000,000

Adjustments to interest rate swap mark to market

No definition available.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

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-Paragraph 10

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- Definition

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

+ References

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-Name FASB Staff Position (FSP)

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- Definition

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

+ References

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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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 interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

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