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summary of the changes in fair value (Details) - Fair Value, Inputs, Level 3 [Member] - Liability [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Acquisition holdback and earnout liabilities at December 31, 2018 | $ 49,132 | $ 30,926
New acquisitions | 12,594 | 35,704
Revaluations | (2,305) | (1,703)
Payouts | (24,011) | (15,969)
Interest on outstanding contingencies | 2,025 | 1,973
Charge offset, forfeit and other | (1,691) | (1,799)
Acquisition holdback and earnout liabilities at December 31, 2020 | $ 35,744 | $ 49,132

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