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Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Provision for Income Taxes |  |  |
Federal income tax expense at statutory tax rate | $ 27,849 | $ 53,892 | $ 52,190
State income taxes, net of federal tax benefit | 9,011 | 7,753 | 4,614
Impact of federal tax law change | 211 | (53,348) |
Officers' compensation | 3,078 | 2,622 | 3,807
Domestic production activities deduction |  | (2,668) | (4,018)
Noncontrolling interest | (3,232) | (2,137) |
Federal R&D credits | (2,658) | (470) | (669)
Reversal of reserve for uncertain tax positions and taxes payable due to statue expirations | (1,958) | (4,337) |
Other | 2,531 | (1,876) | (2,631)
Total tax expense (benefit) | $ 34,832 | $ (569) | $ 53,293
Reconciliation of Effective Income Tax Rate |  |  |
Federal income tax expense at statutory tax rate (in hundredths) | 21.00% | 35.00% | 35.00%
State income taxes, net of federal tax benefit (in hundredths) | 6.80% | 5.00% | 3.10%
Impact of federal tax law change (in hundredths) | 0.20% | (34.60%) |
Officers' compensation (in hundredths) | 2.30% | 1.70% | 2.60%
Domestic production activities deduction (in hundredths) |  | (1.70%) | (2.70%)
Noncontrolling interest (in hundredths) | (2.40%) | (1.40%) |
Federal R&D credits (in hundredths) | (2.00%) | (0.40%) | (0.50%)
Reversal of taxes payable due to statue expiration (in hundredths) | (1.50%) | (2.80%) |
Other (in hundredths) | 1.90% | (1.20%) | (1.80%)
Total (benefit) provision (in hundredths) | 26.30% | (0.40%) | 35.70%

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