Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income tax expense
Statutory expense	$ 120,768	$ 53,581	$ 50,618
State income taxes, net of federal benefit	21,572	9,522	9,258
Nondeductible compensation	4,005	3,545	3,007
Meals, entertainment and travel expense	1,694	2,028	1,476
Adjustment for uncertain tax positions	(1,351)	(984)	114
Valuation allowance change	(932)	(902)	(1,900)
Noncontrolling interest – Piedmont	0	0	(2,447)
Other, net	(827)	(1,221)	(1,183)
Income tax expense	$ 144,929	$ 65,569	$ 58,943
% pre-tax income (loss)
Statutory expense	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	3.80%	3.70%	3.80%
Nondeductible compensation	0.70%	1.40%	1.30%
Meals, entertainment and travel expense	0.30%	0.80%	0.60%
Adjustment for uncertain tax positions	(0.20%)	(0.40%)	0.00%
Valuation allowance change	(0.20%)	(0.40%)	(0.80%)
Noncontrolling interest – Piedmont	0.00%	0.00%	(1.00%)
Other, net	(0.20%)	(0.40%)	(0.40%)
Income tax expense	25.20%	25.70%	24.50%

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 changes in the valuation allowance for deferred tax assets.

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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 noncontrolling interest income (loss) exempt from income taxes.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 noncontrolling interest income (loss) exempt from income taxes.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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