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Fair Value Measurements - Schedule of Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Level 3 Assets $ 450,250 $ 398,768
Level 3 Liabilities 195,406 161,494
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingently returnable consideration 258 70
Level 3 Assets 258 70
Contingent earnout liabilities 53,855 48,769
Level 3 Liabilities $ 53,855 $ 48,769