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Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Difference Between Income Tax Expense Computed Using Statutory Federal Income Tax Rate And Effective Rate [Abstract]      
Statutory federal income tax $ 36,674 $ 27,321 $ 25,522
State income taxes, less federal income tax benefit 5,119 3,801 3,488
Permanent items 1,750 954 167
Change in valuation allowance 0 (9,615) 0
Share-based compensation (6,441) 0 0
Tax Act adjustments 7,442 0 0
Prior year tax adjustments (544) (444) 108
State income tax credits (447) (44) 0
Income tax expense $ 43,553 $ 21,973 $ 29,285