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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Valuation allowance |  |  |  |  |
Income tax provision | $ 6,698 | $ 2,807 | $ 12,261 | $ 6,119 |
Increase in income tax expense | 3,900 |  | 6,200 |  |
Increase in pretax income | 20,600 |  | 33,700 |  |
Deferred tax assets, net | 44,206 |  | 44,206 |  | $ 57,851
Deferred tax assets valuation allowance | $ 10,200 |  | $ 10,200 |  |
Maximum |  |  |  |  |
Valuation allowance |  |  |  |  |
Statutory income tax rate (as a percent) | 21.00% | 21.00% | 21.00% | 21.00% |

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