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Income Taxes - Income Tax Expense (Benefit) Attributable to Income from Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal Current $ 26,860 $ 22,943 $ 22,955
State Current 1,162 2,243 3,103
Current income tax (benefit) expense 28,022 25,186 26,058
Deferred      
Federal Deferred 14,749 1,551 2,841
State Deferred (151) 308 63
Deferred tax expense 14,598 1,859 2,904
Federal Total 41,609 24,494 25,796
State Total 1,011 2,551 3,166
Tax expense (benefit) $ 42,620 $ 27,045 $ 28,962