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Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amount      
Federal income tax expense (benefit) at statutory tax rate $ 33,554 $ 36,599 $ (89,425)
State income taxes, net of federal tax benefit 8,301 8,518 (18,442)
Stock based compensation 87 3,185 1,706
Impact of federal tax law changes 0 (14,476) 0
Officers' compensation 3,664 2,486 2,938
Goodwill impairment 0 0 43,990
Noncontrolling interests (8,872) (9,799) (6,064)
Federal R&D credits (1,105) (3,007) (3,998)
Foreign tax rate differences (625) 1,491 4,940
Federal claim of right credit (8,191) 0 0
Other (1,181) (3,055) (1,254)
Total expense (benefit): $ 25,632 $ 21,942 $ (65,609)
Rate      
Federal income tax expense (benefit) at statutory tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal tax benefit 5.20% 4.90% 4.30%
Stock based compensation 0.10% 1.80% (0.40%)
Impact of federal tax law changes 0.00% (8.30%) 0.00%
Officers' compensation 2.30% 1.40% (0.70%)
Goodwill impairment 0.00% 0.00% (10.30%)
Noncontrolling interests (5.60%) (5.60%) 1.40%
Federal R&D credits (0.70%) (1.70%) 0.90%
Foreign tax rate differences (0.40%) 0.90% (1.20%)
Federal claim of right credit (0.051) 0 0
Other (0.80%) (1.80%) 0.40%
Income tax expense (benefit) 16.00% 12.60% 15.40%