Debt Schedule of Interest Expense On Liability Components (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Debt Instrument [Line Items]
Amortization of the discount on the liability component			$ 0	$ 5,336
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Contractual interest coupon	0	1,397	0	2,795
Amortization of the discount on the liability component	0	2,693	0	5,336
Total interest expense on convertible notes	$ 0	$ 4,090	$ 0	$ 8,131