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Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Extinguishment of Debt [Line Items]
Cash Payments for Debt Conversions (in millions)	$ 52,000	$ 6,297,000
3.75% Senior Subordinated Convertible Notes, Due 2034
Extinguishment of Debt [Line Items]
Stated Interest Rate Percentage - Debt Instruments	3.75%
Maturity Date - Debt Instrument	Jan. 15, 2034
First Conversion Date	Jan. 15, 2009
Number of Notes Converted	113
Cash Payments for Debt Conversions (in millions)	160,000
Deferred Tax Liability (in millions)	300,000
Note Conversions Outstanding	3,495
Outstanding Cash Payments for Debt Conversions	5,500,000
Per Note Conversion Price	$ 461.87
Excess above Principal Note Amount (in millions)	$ 24,000,000

X

- Definition

The Number of convertible subordinated Notes converted during the period

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The Number of convertible subordinated Notes converted but not settled during the period

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- Definition

The cash outflow outstanding from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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- Definition

Adjustment to Additional Paid in Capital resulting from the recognition of deferred taxes for the temporary difference of the convertible debt with a beneficial conversion feature. A beneficial conversion feature is a nondetachable conversion feature that is in-the-money.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Earliest date when the debt instrument can be converted into equity, in CCYY-MM-DD format.

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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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