Financing (Details 6) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Face Value	$ 27,576	$ 28,887
Fair Value	54,403	64,292
Common Stock Shares	40,762,184	22,696,138
Debentures 2006 Series [Member]
Face Value	5,974	6,180
Fair Value	11,852	14,758
Common Stock Shares	8,962,027	5,196,283
Debentures 2007 Series [Member]
Face Value	6,701	6,856
Fair Value	14,654	17,172
Common Stock Shares	11,184,898	6,098,480
Debentures 2008 Series [Member]
Face Value	6,468	6,468
Fair Value	13,835	15,492
Common Stock Shares	10,600,859	5,487,497
Debentures 2009 Series [Member]
Face Value	1,349	1,644
Fair Value	2,833	3,565
Common Stock Shares	2,114,786	1,243,390
Debentures 2010 Series [Member]
Face Value	3,806	3,806
Fair Value	6,553	7,178
Common Stock Shares	4,949,323	2,512,724
Debentures 2011 Series [Member]
Face Value	1,705	1,954
Fair Value	2,379	3,080
Common Stock Shares	1,404,486	1,084,237
Debentures 2012 Series [Member]
Face Value	1,573	1,979
Fair Value	2,297	3,047
Common Stock Shares	$ 1,545,805	$ 1,073,527