Income Taxes (Statutory Federal Income Tax Rate) (Details) - CTRS - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount
Federal income tax benefit (expense)	$ 47	$ (1,159)	$ 778
State income tax benefit (expense), net of federal income tax effect	5	(132)	90
Change in deferred tax assets as a result of change in tax law	(340)	0	0
Valuation allowance	283	1,282	(833)
Other	5	9	(35)
Benefit applicable to income (loss) from continuing operations	$ 0	$ 0	$ 0
Rate
Federal income tax benefit (expense) (percent)	35.00%	35.00%	35.00%
State income tax benefit (expense), net of federal income tax effect (percent)	4.00%	4.00%	4.00%
Change in deferred tax assets as a result of change in tax law (percent)	(254.00%)	0.00%	0.00%
Valuation allowance (percent)	211.00%	(39.00%)	(37.00%)
State deferred tax adjustment (percent)	4.00%	0.00%	(2.00%)
Benefit applicable to income (loss) from continuing operations (percent)	0.00%	0.00%	0.00%

Income Tax Reconciliation, State Deferred Tax Adjustment

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