Income Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Provision (benefit) for federal income taxes at statutory rates	$ 711	$ (889)	$ 1,247
Provision for state income taxes, net of federal benefit	421	120	688
Valuation allowance changes affecting the provision for income taxes	(372)	(45)	(534)
Employment tax credits	(217)	(529)	(1,249)
Nondeductible expenses	496	453	862
Stock based compensation expense	(35)	(62)	(105)
Effect of Tax Cuts and Jobs Creation Act	5,476	0	0
Other	263	(78)	7
Provision (benefit) for income taxes of continuing operations	$ 6,743	$ (1,030)	$ 916