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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current provision:                      
Federal                 $ 172,153 $ 150,800 $ 102,516
State                 28,387 24,378 32,638
Total current provision                 200,540 175,178 135,154
Deferred benefit:                      
Federal                 58,003 (8,240) (57,076)
State                 14,773 (1,474) (6,225)
Total deferred benefit                 72,776 (9,714) (63,301)
Provision for income tax expense $ 127,310 $ 55,189 $ (30,664) $ 121,481 $ 34,666 $ 40,701 $ 33,801 $ 56,296 $ 273,316 $ 165,464 $ 71,853