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Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amount |  |  |
Federal income tax expense (benefit) at statutory tax rate | $ 36,599 | $ (89,425) | $ 27,849
State income taxes, net of federal tax benefit | 8,518 | (18,442) | 9,011
Stock based compensation | 3,185 | 1,706 | 0
Impact of federal tax law changes | (14,476) | 0 | 211
Officers' compensation | 2,486 | 2,938 | 3,078
Goodwill impairment | 0 | 43,990 | 0
Noncontrolling interests | (9,799) | (6,064) | (3,232)
Federal R&D credits | (3,007) | (3,998) | (2,658)
Reversal of reserve for uncertain tax positions due to statute expirations | (489) | (773) | (1,958)
Foreign tax rate differences | 1,491 | 4,940 | (19)
Other | (2,566) | (481) | 2,550
Total expense (benefit): | $ 21,942 | $ (65,609) | $ 34,832
Rate |  |  |
Federal income tax expense (benefit) at statutory tax rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit | 4.90% | 4.30% | 6.80%
Stock based compensation | 1.80% | (0.40%) | 0.00%
Impact of federal tax law changes | (8.30%) | 0.00% | 0.20%
Officers' compensation | 1.40% | (0.70%) | 2.30%
Goodwill impairment | 0.00% | (10.30%) | 0.00%
Noncontrolling interests | (5.60%) | 1.40% | (2.40%)
Federal R&D credits | (1.70%) | 0.90% | (2.00%)
Reversal of reserve for uncertain tax positions due to statute expirations | (0.30%) | 0.20% | (1.50%)
Foreign tax rate differences | 0.90% | (1.20%) | 0.00%
Other | (1.50%) | 0.20% | 1.90%
Income tax expense (benefit) | 12.60% | 15.40% | 26.30%

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