Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
U.S. statutory income tax rate		34.00%	34.00%
Change in tax rate, deferred tax asset valuation		$ 14,500,000
Change in tax rate, transition tax		$ 0
Valid portion of valuation allowance percentage		100.00%
Permanent book/tax differences and expirations		$ 90,000,000
Accrued interest and penalties		100,000
Reserves for uncertain tax positions		100,000	$ 100,000
Scenario, Plan [Member]
Operating Loss Carryforwards [Line Items]
U.S. statutory income tax rate	21.00%
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers expiring unused		288,100,000
Operating loss carryforwards		$ 98,500,000
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, 2037
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax year subject to examination		1998
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 1,700,000
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, 2018
State [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration date		Dec. 31, 2037