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Summary of Significant Accounting Policies - Aggregate Fair Values of Outstanding and Unearned Contingent Consideration Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Contingent consideration liabilities, current portion	$ 3,466	$ 77,618
Level 3 | Recurring
Business Acquisition [Line Items]
Contingent consideration liabilities	10,969	84,160
Accounts payable and accrued expenses | Level 3 | Recurring
Business Acquisition [Line Items]
Contingent consideration liabilities, current portion	3,466	77,618
Insurance and other non-current liabilities | Level 3 | Recurring
Business Acquisition [Line Items]
Contingent consideration liabilities, noncurrent	$ 7,503	$ 6,542

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Amount of liability recognized arising from contingent consideration in a business combination.

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