Income Taxes (Rollforward of Valuation Allowances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance at beginning of the year	$ 1,346	$ 1,147
Release of Colorado net operating loss valuation allowance	0	(8)
Change in federal benefit tax rate - deferred	0	240
Expiration of state net operating losses	(283)	(33)
Valuation allowance at end of the year	$ 1,063	$ 1,346