Financing (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	$ 75,351	$ (37,536)	$ (14,298)	$ (30,089)
Less: Day-one loss from debenture financings	0	(405)	0	(1,181)
Gain (loss) from change in fair value of derivative liability	75,351	(37,941)	(14,298)	(31,270)
Series C Preferred Stock [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	11,915	(10,285)	(3,202)	(7,845)
Gain (loss) from change in fair value of derivative liability			(632)
Series D Preferred Stock [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	1,946	(2,813)	(1,346)	(2,261)
Gain (loss) from change in fair value of derivative liability			(370)
Debentures 2006 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	18,815	(8,901)	(3,070)	(7,013)
Debentures 2008 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	13,391	(5,503)	(1,350)	(4,265)
Debentures 2009 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	4,964	(2,260)	(486)	(1,871)
Debentures 2010 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	11,901	(4,702)	(34)	(4,067)
Debentures 2011 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	8,896	(3,702)	(4,825)	(2,767)
Debentures 2012 Series [Member]
Increase (Decrease) In Fair Value Of Derivative Instruments, Not Designated As Hedging Instruments	$ 3,523	$ 0	$ 15	$ 0