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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |  |  |
Effective tax rates on continuing operations |  |  |  | 24.70% | 24.10% | 45.20%
Federal statutory income tax rate (as a percent) | 21.00% |  |  | 21.00% | 21.00% | 35.00%
Income taxes at the federal statutory rate of 35% |  |  |  | $ 31,866 | $ 31,222 | $ 35,328
Increases (decreases) resulting from- |  |  |  |  |  |
Net state income taxes |  |  |  | 6,644 | 7,470 | 2,838
Valuation allowances |  |  |  | (279) | (2,852) | 91
Net unrecognized tax benefits |  |  |  | 7,338 | (15) | 153
Nondeductible expenses |  |  |  | 2,180 | 1,926 | 1,134
R&D tax credits |  | $ (4,600) |  | (4,569) | (2,726) |
179D deduction |  |  |  | (5,126) |  |
Net operating loss carryforwards |  |  |  |  | 2,225 |
Stock-based compensation deductions |  |  |  | (714) | (1,293) | (1,320)
Domestic production activities deduction |  |  |  |  |  | (2,112)
Corporate tax rate reduction to 21% |  |  |  |  |  | 9,478
Other |  |  |  | 78 | (184) | 76
Provision for income taxes |  |  |  | 37,418 | $ 35,773 | $ 45,666
Increase to provision for income taxes |  |  | $ 2,800 |  |  |
179D deduction |  |  |  | $ (2,200) |  |

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