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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 257,566 | $ 157,720 | $ 258,943 | $ 161,513
Additions to estimated acquisition earn-out payables | 10,097 | 60,776 | 25,085 | 74,754
Payments for estimated acquisition earn-out payables | (24,475) | (664) | (39,949) | (7,478)
Subtotal | 243,188 | 217,832 | 244,079 | 228,789
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | (3,326) | (1,308) | (6,040) | (13,949)
Interest expense accretion | 1,722 | 1,943 | 3,545 | 3,627
Net change in earnings from estimated acquisition earn-out payables | (1,604) | 635 | (2,495) | (10,322)
Foreign currency translation adjustments during the year | 432 |  | 432 |
Ending balance | $ 242,016 | $ 218,467 | $ 242,016 | $ 218,467

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