Debt - Notes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Roll Forward]
Change in fair value of embedded derivative	$ 32,244	$ 3,305	$ (34,100)	$ 3,758
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			2,176
Change in fair value of embedded derivative			31,818
Embedded conversion option, conversion			(78,797)
Convertible notes, conversion			(55,442)
Discount, conversion			12,997
Conversion			(121,242)
Embedded derivatives, ending balance	18,968		18,968
Convertible notes, ending balance	32,200		32,200
Discount, ending balance	(6,962)		(6,962)
Total, ending balance	$ 44,206		$ 44,206