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Convertible Notes (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Convertible Notes
Total principal amount of convertible notes	$ 172,500	$ 172,500
Unamortized discount	(35,655)	(39,007)
Total convertible notes	136,845	133,493
Total long-term convertible notes	136,845	133,493
5% Convertible Senior Notes due 2014
Convertible Notes
Total principal amount of convertible notes	172,500	172,500
Unamortized discount	(35,655)	(39,007)
Total convertible notes	136,845	133,493
Total long-term convertible notes	$ 136,845	$ 133,493
Convertible notes stated interest rate (as a percent)	5.00%	5.00%	5.00%

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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- Definition

Interest rate stated in the contractual debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

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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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-Name Accounting Principles Board Opinion (APB)

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-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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