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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
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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