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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	2.40%	2.40%	2.40%
State tax credits, net of federal effect	(1.20%)	(1.20%)	(1.00%)
Excess tax benefits	(1.30%)	(0.40%)	(2.30%)
Nondeductible expenses	0.10%		0.10%
Other	0.40%	1.00%	(1.80%)
Effective income tax rate	21.40%	22.80%	18.40%

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Effective income tax rate reconciliation excess tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.

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