Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance	$ 805,000	$ 21,958,000
Change in Valuation Allowance, Deferred Tax Asset	(21,200,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	9,000,000.0	6,000,000.0
Benefits (Expenses) from the decrease (increase) of interest expense	450,000	400,000	$ 1,300,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	828,000	$ 1,400,000
Minimum
Income Tax Examination, Estimate of Possible Loss	0
Maximum
Income Tax Examination, Estimate of Possible Loss	3,300,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 87,700,000