Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current provision (benefit):
Federal									$ 259,536	$ 172,153	$ 150,800
State									64,843	28,387	24,378
Total current provision (benefit)									324,379	200,540	175,178
Deferred provision (benefit):
Federal									47,240	58,003	(8,240)
State									8,132	14,773	(1,474)
Total deferred provision (benefit)									55,372	72,776	(9,714)
Provision for income tax expense	$ 103,660	$ 19,392	$ 53,174	$ 203,525	$ 127,310	$ 55,189	$ (30,664)	$ 121,481	$ 379,751	$ 273,316	$ 165,464