Income Tax (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 0	$ 0	$ 0
Net losses	2,231	18,708	24,356
Estimated tax effect of claimed deductions	2,200
Tax payable	0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	50,600	57,200	53,400
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 49,800	$ 56,400	$ 53,200