Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Net operating loss carryforwards	$ 37,300	$ 43,100
Accrued interest payable related to uncertain tax positions	163	$ 159
Undistributed earnings of domestic subsidiaries	35,100
Additional taxes if interest in all businesses is sold rather than to effect a tax-free liquidation	$ 8,400
Maximum [Member]
Income Taxes [Line Items]
Net operating losses expiration year	2040
Minimum [Member]
Income Taxes [Line Items]
Net operating losses expiration year	2025