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Income Taxes - Provision for income taxes breakup (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes      
Provisional income tax expense $ 26,600   $ 26,600
Current:      
Federal 40,375 $ 25,275 46,153
State 4,965 6,783 3,018
Total current tax expense 45,340 32,058 49,171
Deferred:      
Federal (1,598) 12,557 31,971
State 200 769 109
Total deferred tax expense (benefit) (1,398) 13,326 32,080
Provision for income taxes $ 43,942 $ 45,384 $ 81,251
Federal statutory income tax rate (as a percent) 21.00% 21.00% 35.00%