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Income Taxes Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal statutory rate $ 11,474 $ 11,300 $ 12,105
Federal statutory rate (as a percent) 35.00% 35.00% 35.00%
Effect of state income taxes, net of federal benefit $ 1,304 $ 1,127 $ 1,618
Effect of state income taxes, net of federal benefit (as a percent) 4.00% 3.50% 4.70%
Effect of non-deductible expenses and other, net $ (36) $ 213 $ 155
Effectof non-deductible expenses and other, net (as a percent) (0.10%) 0.70% 0.40%
Change in valuation allowance $ 23 $ 20 $ (141)
Change in valuation allowance (as a percent) 0.10% 0.10% (0.40%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ (17,176) $ 0 $ 0
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (52.40%) 0.00% 0.00%
Total income tax provision (benefit) $ (4,411) $ 12,660 $ 13,737
Income tax expense (benefit) (as a percent) (13.50%) 39.30% 39.70%