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Income Taxes and Related Payments - Additional information (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) TRA | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Approximate percentage of earnings not subject to income taxes | 25.00% |  |
Effective tax rate | 18.10% | 7.30% |
Number of tax receivable agreements (TRAs) | TRA | 2 |  |
TRA percent of savings to be paid to shareholders | 85.00% |  |
Tax receivable agreement percentage to be retained by entity | 15.00% |  |
Tax receivable agreement payment period | 125 days |  |
Unrecognized tax benefits | $ 1,500 |  | $ 2,000
Deferred Tax Asset - Amortizable basis |  |  |
Deferred tax assets, beginning | 408,140 |  |
2020 Holdings Common Unit Exchanges | 23,094 |  |
Amortization | (26,504) |  |
Change in estimate | (61) |  |
Deferred tax assets, ending | 426,093 |  |
Amounts payable under tax receivable agreements |  |  |
Amounts payable under tax receivable, beginning agreements | 375,324 |  |
Establishment of amounts payable under tax receivable agreements | 37,602 | $ 29,368 |
Payment under the tax receivable agreements | (26,943) | $ (24,998) |
Amounts payable under tax receivable, ending agreements | 385,984 |  |
Unrecognized tax benefits, income tax penalties accrued | 300 |  |
Unrecognized tax benefits | $ 1,500 |  | $ 2,000
Statutory tax rate | 21.00% |  |
Capital Unit |  |  |
Amounts payable under tax receivable agreements |  |  |
Establishment of amounts payable under tax receivable agreements | $ 19,630 |  |
LIBOR |  |  |
Tax receivable, basis point spread on variable rate (as a percent) | 100 |  |

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