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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 95,128 $ 68,088 $ 58,408
State 16,883 13,884 14,572
Current income tax expense (benefit) 112,011 81,972 72,980
Deferred:      
Federal (14,257) 4,893 6,046
State 4,098 (400) 679
Deferred income tax expense (benefit) (10,159) 4,493 6,725
Total $ 101,852 $ 86,465 $ 79,705