Debt Schedule of Interest Expense On Liability Components (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Debt Instrument [Line Items]
Amortization of the discount on the liability component			$ 5,336	$ 4,957
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Contractual interest coupon	1,397	1,397	2,795	2,795
Amortization of the discount on the liability component	2,693	2,501	5,336	4,957
Total interest expense on convertible notes	$ 4,090	$ 3,898	$ 8,131	$ 7,752