Debt - Notes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Notes [Member]	Jan. 30, 2013 Notes [Member]
Debt Instrument [Roll Forward]
Embedded derivatives, beginning balance			$ 101,087	$ 59,204
Convertible notes, beginning balance			158,064
Discount, beginning balance			(47,239)
Total, beginning balance			211,912
Amortization of debt discount			1,777
Change in fair value of embedded derivative	(10,515)	(23,549)	11,112
Embedded derivatives, ending balance			112,199	59,204
Convertible notes, ending balance			158,064
Discount, ending balance			(45,462)
Total, ending balance			$ 224,801