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Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ 152,836 $ 113,491 $ 169,053
State 42,438 38,647 25,644
Total current income tax expense (benefit) 195,274 152,138 194,697
Deferred:      
Federal 12,013 49,125 (81,551)
State 1,144 8,582 (1,088)
Total deferred income tax expense (benefit) 13,157 57,707 (82,639)
Total provision for income taxes $ 208,431 $ 209,845 $ 112,058