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Fair Value Measurements - Indemnification Asset Rollforward (Details) - Indemnification Asset
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 29,789
Change in fair value (3,878)
Ending balance $ 25,911