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Income Taxes (Reconciliation of Income Tax Expense to US Statutory Rate) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of income tax expense |  |  |
Income tax expense at U.S. statutory rate | $ 25,600,000 | $ 14,100,000 | $ 4,000,000.0
Income attributable to noncontrolling interests in partnerships | (900,000) | (1,100,000) | (1,100,000)
State and other income taxes, net of federal income tax effects | (900,000) | 1,600,000 | 7,800,000
Foreign income taxes | 4,800,000 | 0 | 0
Impact Of CARES Act | 0 | 0 | (1,500,000)
R&D tax credit | (4,000,000) | 0 | 0
Non-deductible equity compensation | 3,000,000.0 | 3,400,000 | 1,000,000.0
Return to provision adjustments | (100,000) | (100,000) | 1,200,000
Change in valuation allowance(3) | (11,000,000.0) | 500,000 | (1,300,000)
Other | 300,000 | (100,000) | 200,000
Total | $ 16,800,000 | $ 18,300,000 | $ 10,300,000
Reconciliation of income tax expense (as a percent) |  |  |
Income tax expense at U.S. statutory rate | 21.00% | 21.00% | 21.00%
Income attributable to noncontrolling interests in partnerships | (0.70%) | (1.70%) | (5.60%)
State and other income taxes, net of federal income tax effects | (0.70%) | 2.40% | 41.20%
Foreign income taxes | 4.00% | 0.00% | 0.00%
Impact Of CARES Act | 0.00% | 0.00% | (7.90%)
R&D tax credit | (3.40%) | 0.00% | 0.00%
Non-deductible equity compensation | 2.50% | 4.90% | 5.50%
Return to provision adjustments | (0.10%) | (0.10%) | 6.50%
Change in valuation allowance(3) | (9.00%) | 0.80% | (6.90%)
Other | 0.20% | (0.10%) | 0.50%
Total effective income tax expense | 13.80% | 27.20% | 54.30%
Income tax expense attributable to noncontrolling interests | $ 0 |  | $ 6,500,000
Impact of change in tax laws | 4,900,000 | $ 1,300,000 |
Deferred tax benefit | 11,300,000 |  |
CARES Act, income tax benefit |  |  | 1,500,000
R&D tax credit | $ 4,000,000 | $ 0 | $ 0

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