Financing (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Conversion [Line Items]
Debentures, Face Value	$ 35,826	$ 35,845
Debentures, Fair Value	38,851	37,384
Debentures, Common Stock Shares	442,257,188	436,904,318
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	1,962	1,961
Debentures, Fair Value	2,102	2,019
Debentures, Common Stock Shares	24,204,635	23,871,436
Debentures 2007 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	812	814
Debentures, Fair Value	1,034	1,000
Debentures, Common Stock Shares	11,677,185	11,549,397
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	1,925	1,925
Debentures, Fair Value	2,028	1,949
Debentures, Common Stock Shares	22,883,750	22,598,665
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	0	7
Debentures, Fair Value	30	46
Debentures, Common Stock Shares	331,733	517,119
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	794	785
Debentures, Fair Value	849	800
Debentures, Common Stock Shares	9,780,037	9,469,332
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	972	972
Debentures, Fair Value	1,155	1,111
Debentures, Common Stock Shares	13,124,733	12,926,448
Debentures 2013 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	29,211	29,211
Debentures, Fair Value	31,501	30,297
Debentures, Common Stock Shares	358,502,804	354,041,487
Debentures 2014 Series [Member]
Debt Conversion [Line Items]
Debentures, Face Value	150	170
Debentures, Fair Value	$ 152	$ 162
Debentures, Common Stock Shares	1,752,311	1,930,434