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Fair Value Measurements - Schedule of Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Level 3 Assets $ 869,668 $ 398,768
Level 3 Liabilities 447,034 161,494
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingently returnable consideration 387 70
Level 3 Assets 387 70
Contingent earnout liabilities 78,535 48,769
Level 3 Liabilities $ 78,535 $ 48,769