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Income Taxes (Reconciliation of Income Tax Expense to US Statutory Rate) (Details) - USD ($)
 12 Months Ended
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