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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 218,467 | $ 104,976 | $ 161,513 | $ 89,924
Additions to estimated acquisition earn-out payables | 22,091 | 47,498 | 96,845 | 71,464
Payments for estimated acquisition earn-out payables | (3,580) | (601) | (11,058) | (7,865)
Subtotal | 236,978 | 151,873 | 247,300 | 153,523
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | 13,433 | (6,573) | (516) | (10,873)
Interest expense accretion | 1,885 | 1,303 | 5,512 | 3,953
Net change in earnings from estimated acquisition earn-out payables | 15,318 | (5,270) | 4,996 | (6,920)
Ending balance | $ 252,296 | $ 146,603 | $ 252,296 | $ 146,603

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