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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 | Mar. 31, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | $ 88,000 | $ 84,200
Recurring |  |
Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | 88,007 | 84,160
Accounts payable and accrued expenses | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, current | 80,947 | 77,618
Insurance and other non-current liabilities | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, non-current | $ 7,060 | $ 6,542

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