Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Valid portion of valuation allowance percentage	100.00%
Permanent book/tax differences and expirations	$ 86,000,000
Accrued interest and penalties	100,000
Reserves for uncertain tax positions	100,000	$ 300,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers expiring unused	290,000,000
Operating loss carryforwards	$ 95,600,000
Federal [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2030
Federal [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2036
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax year subject to examination	1997
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 1,500,000
Number of prior years subject to examination	10 years
State [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2017
State [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2036