Debt - Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Roll Forward]
Change in fair value of embedded derivative	$ (16,556)	$ 10,967	$ (66,344)	$ 594
Notes
Debt Instrument [Roll Forward]
Embedded derivatives, beginning balance			65,947
Convertible notes, beginning balance			87,642
Discount, beginning balance			(22,135)
Total, beginning balance			131,454
Amortization of debt discount			1,680
Change in fair value of embedded derivative			67,950
Embedded conversion option, conversion			(60,346)
Convertible notes, conversion			(41,442)
Discount, conversion			9,907
Conversion			(91,881)
Embedded derivatives, ending balance	73,551		73,551
Convertible notes, ending balance	46,200		46,200
Discount, ending balance	(10,548)		(10,548)
Total, ending balance	$ 109,203		$ 109,203