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Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amount      
Federal income tax expense (benefit) at statutory tax rate $ (38,336) $ (56,211) $ 33,554
State income taxes, net of federal tax benefit (10,556) (21,784) 8,301
Share-based compensation 446 1,227 87
Officers' compensation 5,129 2,840 3,664
Noncontrolling interests (9,795) (3,861) (8,872)
Federal R&D credits (493) 128 (1,105)
Foreign tax rate differences (297) (1,438) (625)
Federal claim of right credit 0 0 (8,191)
Valuation allowance 347 7,991 0
Other (1,402) (3,990) (1,181)
Income tax expense (benefit) $ (54,957) $ (75,098) $ 25,632
Rate      
Federal income tax expense (benefit) at statutory tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal tax benefit 5.80% 8.10% 5.20%
Share-based compensation (0.20%) (0.50%) 0.10%
Officers' compensation (2.80%) (1.10%) 2.30%
Noncontrolling interests 5.40% 1.40% (5.60%)
Federal R&D credits 0.30% 0.00% (0.70%)
Foreign tax rate differences 0.20% 0.50% (0.40%)
Federal claim of right credit 0 0 (0.051)
Valuation allowance (0.20%) (3.00%) 0.00%
Other 0.60% 1.70% (0.80%)
Income tax expense (benefit) 30.10% 28.10% 16.00%