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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Significant non-cash investing and financing activities |  |
Other payable issued for purchased customer accounts | $ (9) | $ 1,547
Estimated acquisition earn-out payables and related charges | 14,988 | $ 13,978
Common stock issued for agency acquisition | 4,892 |
Notes payable issued or assumed for purchased customer accounts | $ (1,355) |

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