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Income Taxes (Reconciliation of Effective Income Tax Rate) (Details) | 12 Months Ended
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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% | (2548.10%) | 179.90%
Effective Income Tax Rate Reconciliation, Uncertain Tax Benefits | 0.00% | 0.00% | (385.40%)
State income taxes, net of federal benefit | 2.70% | (60.80%) | 64.10%
Company provided benefits | 0.50% | 10.60% | 17.30%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent | (0.30%) | (7.10%) | (12.60%)
Effective Income Tax Rate Reconciliation, Company Provided Benefits | 0.50% | 15.20% | 139.80%
Accrued interest on uncertain tax benefits | 0.10% | 2.10% | (127.70%)
Effective Income Tax Rate Reconciliation, Compensation-based credits | (1.00%) | (22.30%) | (55.50%)
Other, net | (0.50%) | 1.60% | (4.00%)
Effective tax rate | 1.80% | (2573.80%) | (149.10%)

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