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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
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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