Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Examination [Line Items]
Deferred Tax Assets, Valuation Allowance		$ 0	$ 0
Anticipated Reduction Resulting from Lapse of Applicable Statue of Limitations		503,000	509,000
Income tax interest and penalties		200,000	100,000	$ 100,000
Accrued income tax interest and penalties		500,000	300,000
Change in statutory tax rate		0	$ 7,070,000	$ 0
Increase in provisional amount, a component of income tax expense		$ 100,000
Scenario, Forecast
Income Tax Examination [Line Items]
Anticipated Reduction Resulting from Lapse of Applicable Statue of Limitations	$ 500,000