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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Remeasurement of net deferred tax asset - Tax Cuts & Jobs Act	$ 0	$ 0	$ 4,601
Valuation allowance	497	$ 497
Tax credits	415
Federal [Member]
Segment Reporting Information [Line Items]
Net operating loss carryforwards	35,287
State [Member]
Segment Reporting Information [Line Items]
Net operating loss carryforwards	$ 39,723