Debt Schedule of Interest Expense On Liability Components (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Debt Instrument [Line Items]
Amortization of the discount on the liability component			$ 5,336	$ 7,505
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Contractual interest coupon	625	1,398	3,420	4,193
Amortization of the discount on the liability component	0	2,547	5,336	7,505
Total interest expense on convertible notes	$ 625	$ 3,945	$ 8,756	$ 11,698