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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 | Sep. 30, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | $ 79,400 | $ 70,800
Recurring |  |
Business Acquisition [Line Items] |  |
Total contingent consideration liabilities | 79,420 | 70,756
Accounts payable and accrued expenses | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, current | 70,982 | 0
Insurance and other non-current liabilities | Recurring |  |
Business Acquisition [Line Items] |  |
Contingent consideration liabilities, non-current | $ 8,438 | $ 70,756

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