Debt Schedule of Interest Expense On Liability Components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 0	$ 0	$ 5,336
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Contractual interest coupon	0	0	3,420
Amortization of the discount on the liability component	0	0	5,336
Total interest expense on convertible notes	$ 0	$ 0	$ 8,756