Tax benefit, recorded through additional paid in capital, resulting from the premium paid on conversion for the convertible debt redemption

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Interest rate stated in the contractual debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended				6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Apr. 05, 2011 Redeemed With Accrued Interest [Member] Convertible Debt [Member] 3.75% Convertible Notes [Member]	Apr. 05, 2011 Surrendered For Conversion [Member] Convertible Debt [Member] 3.75% Convertible Notes [Member]	Jun. 30, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member]	Apr. 05, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member]	Jun. 30, 2011 Convertible Debt [Member] 3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible notes stated interest rate						3.75%		3.375%
Convertible notes remaining principal amount				$ 11,865	$ 80,635		$ 92,500
Repayments of convertible debt, including premium on conversion						90,438
Deferred Tax Assets, Noncurrent, Operating Loss Carryforwards, Reduction for Convertible Notes Redemption						15,252
Premium paid on convertible debt redemption	9,803	9,803	0			9,803
Adjustments to additional paid in capital, premium paid on convertible debt redemption						6,085
Adjustments to additional paid in capital, income tax benefit from premium paid on convertible debt redemption						3,718
Contingent convertible debt interest, amount recaptured for income tax purpose						40,217
Reduction in short-term deferred tax liabilities						$ 15,252