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Summary of Significant Accounting Policies - Aggregate Fair Values of Outstanding and Unearned Contingent Consideration Liabilities (Details) - Level 3 - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | $ 75,800 | $ 84,200
Recurring |  |
Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | 75,770 | 84,160
Accounts payable and accrued expenses | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, current | 68,466 | 77,618
Insurance and other non-current liabilities | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, non-current | $ 7,304 | $ 6,542

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