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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 104,976 | $ 52,540 | $ 89,924 | $ 36,175
Additions to estimated acquisition earn-out payables | 47,498 | 29,646 | 71,464 | 51,717
Payments for estimated acquisition earn-out payables | (601) | (16,521) | (7,865) | (25,112)
Subtotal | 151,873 | 65,665 | 153,523 | 62,780
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | (6,573) | (928) | (10,873) | 945
Interest expense accretion | 1,303 | 571 | 3,953 | 1,583
Net change in earnings from estimated acquisition earn-out payables | (5,270) | (357) | (6,920) | 2,528
Ending balance | $ 146,603 | $ 65,308 | $ 146,603 | $ 65,308

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