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Income Taxes (Reconciliation of Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(35.20%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%	(2448.10%)	200.90%
Effective Income Tax Rate Reconciliation, Uncertain Tax Benefits	0.00%	0.00%	(421.60%)
State income taxes, net of federal benefit	2.70%	(59.20%)	69.20%
Company provided benefits	0.50%	10.30%	19.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.30%)	(6.90%)	(13.80%)
Effective Income Tax Rate Reconciliation, Company Provided Benefits	0.50%	14.80%	152.90%
Accrued interest on uncertain tax benefits	0.10%	2.10%	(139.70%)
Effective Income Tax Rate Reconciliation, Compensation-based credits	(1.00%)	(21.70%)	(60.80%)
Other, net	(0.50%)	1.50%	(4.50%)
Effective tax rate	1.80%	(2472.20%)	(163.40%)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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