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Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Cash paid |  |  | $ 162,752
Common stock issued | $ 4,892 | $ 10,000 | 4,892
Other payable |  |  | 1,883
Recorded earn-out payable |  |  | 25,085
Net assets acquired |  |  | 194,612
Maximum potential earn- out payable |  |  | 46,325
O'Leary Insurances (O'Leary) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired |  |  | $ 137,648
O'Leary Insurances (O'Leary) | Retail |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Effective date of acquisition |  |  | Jan. 01, 2021
Cash paid |  |  | $ 117,408
Common stock issued |  |  | 4,892
Recorded earn-out payable |  |  | 15,348
Net assets acquired |  |  | 137,648
Maximum potential earn- out payable |  |  | 30,575
Piper Jordan LLC (Piper) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired |  |  | $ 54,679
Piper Jordan LLC (Piper) | Retail |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Effective date of acquisition |  |  | May 01, 2021
Cash paid |  |  | $ 43,428
Other payable |  |  | 1,397
Recorded earn-out payable |  |  | 9,854
Net assets acquired |  |  | 54,679
Maximum potential earn- out payable |  |  | 15,000
Other Acquisitions |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired |  |  | 2,285
Other Acquisitions | Various |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Cash paid |  |  | 1,916
Other payable |  |  | 486
Recorded earn-out payable |  |  | (117)
Net assets acquired |  |  | 2,285
Maximum potential earn- out payable |  |  | $ 750

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