Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Valuation allowance	$ 19,191,000	$ 18,445,000
Deferred tax assets expected to be realized	130,800,000
Deferred tax assets, subject to expiration	130,800,000
Deferred tax assets, not subject to expiration	111,800,000
Unrecognized tax benefits, income tax penalties and interest accrued	2,700,000	3,300,000	$ 227,000
Unrecognized tax benefits that would impact effective tax rate	19,100,000	20,400,000	15,200,000
Unrecognized tax benefits, income tax penalties and interest accrued that would impact effective tax rate	(366,000)	$ 1,400,000	$ 193,000
Approximate range of uncertain income tax positions expected to be settled or resolved during the next 12 months, minimum	83,000
Period through 2036
Income Tax Contingency [Line Items]
Deferred tax assets, subject to expiration	29,700,000
Federal and State | Period through 2029
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	$ 8,600,000