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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
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Mar. 31, 2021 | Mar. 31, 2020
Business Combinations [Abstract] |  |
Beginning balance | $ 258,943 | $ 161,513
Additions to estimated acquisition earn-out payables | 14,988 | 13,978
Payments for estimated acquisition earn-out payables | (15,475) | (6,814)
Subtotal | 258,456 | 168,677
Net change in earnings from estimated acquisition earn-out payables: |  |
Change in fair value on estimated acquisition earn-out payables | (2,713) | (12,641)
Interest expense accretion | 1,823 | 1,684
Net change in earnings from estimated acquisition earn-out payables | (890) | (10,957)
Ending balance | $ 257,566 | $ 157,720

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