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Convertible Subordinated Notes (Details) (3.25% Notes due September 2012 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011
3.25% Notes due September 2012 [Member]
Outstanding balance of convertible subordinated notes
Convertible subordinated notes outstanding	$ 214,955	$ 214,955
Semi-Annual Interest Payment Dates	March 28, September 28

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt 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, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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