Debt Schedule of Interest Expense On Liability Components (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 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	625	0	3,420
Amortization of the discount on the liability component	0	0	0	5,336
Total interest expense on convertible notes	$ 0	$ 625	$ 0	$ 8,756