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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current                      
Current federal income tax expense (benefit)                 $ 35,401 $ 64,910 $ 50,780
Current state income tax expense (benefit)                 27,749 24,739 20,922
Current income tax expense (benefit)                 63,150 89,649 71,702
Deferred                      
Deferred federal income tax expense (benefit)                 2,336 31,464 4,198
Deferred state income tax expense (benefit)                 406 3,276 1,552
Deferred income tax expense (benefit)                 2,742 34,740 5,750
Total                      
Federal income tax expense (benefit)                 37,737 96,374 54,978
State income tax expense (benefit)                 28,155 28,015 22,474
Income tax provision $ 16,069 $ 15,461 $ 16,629 $ 17,733 $ 48,231 $ 27,708 $ 25,451 $ 22,999 65,892 $ 124,389 $ 77,452
Provisional amount recorded as increase to income tax provision expense                 25,400    
Income tax expense recorded                 $ 442