Income Taxes (Schedule of Reconciliation of Effective Tax Rate) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. Federal income tax benefit at federal statutory rate	21.00%	21.00%	35.00%
Change in valuation allowance	(6.00%)	(21.00%)
Permanent differences	7.00%	(3.00%)
NOL Expiration - 1998	(26.00%)
Other, net	4.00%	3.00%
Effective tax rate

Effective Income Tax Rate Reconciliation, Net Operating Loss Expiration

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Effective Income Tax Rate Reconciliation, Permanent Differences

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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