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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Income before income tax | $ 50,455 | $ 60,383 | $ 77,958 | $ 12,759 | $ 71,408 | $ 63,950 | $ 141,909 | $ 202,292
Income tax expense | $ 2,711 | $ 767 | $ 19,196 | $ 4,485 | $ 6,503 | $ 41,453 | $ 60,650 | $ 61,417
Effective tax rate (as a percent) | 5.40% |  |  | 35.20% | 9.10% | 64.80% |  |
Unrecognized tax benefits, period decrease |  |  |  |  | $ 3,600 |  |  |
Unrecognized tax benefits approximate amount of estimated reduction within the next twelve months | $ 13,000 |  |  |  | $ 13,000 |  |  |

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