Fair Value (Assets and Liabilities Measured on a Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 17,391,000				$ 27,241,000
Marketable Securities - restricted					14,500,000
Warrants	(14,000)				(295,000)
Total	17,377,000				41,446,000
Derivative, Fair Value, Net	0
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	17,391,000				27,241,000
Marketable Securities - restricted					13,499,000
Warrants	0				0
Total	17,391,000				40,740,000
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0				0
Marketable Securities - restricted					1,001,000
Warrants	0				0
Total	0				1,001,000
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0				0
Marketable Securities - restricted					0
Warrants	(14,000)				(295,000)				(380,000)
Total	(14,000)				(295,000)
Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants	(14,000)	(66,000)	(104,000)	(206,000)	(295,000)	(2,112,000)	(144,000)	(531,000)	(380,000)	(1,247,000)	(1,861,000)	(2,504,000)	(2,805,000)
Warrant | Change During Period, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants	$ 52,000	$ 38,000	$ 102,000	$ 89,000	$ 1,817,000	$ (1,968,000)	$ 387,000	$ (151,000)	$ 867,000	$ 614,000	$ 643,000	$ 301,000