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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 23, 2019
Sep. 16, 2019
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Goodwill     $ 594,561 $ 594,561 $ 599,351
Accent          
Business Acquisition [Line Items]          
Acquisition of a business, net of cash acquired $ 157,600        
Change in value of accounts receivable     2,300    
Change in value of cash and cash equivalents     500    
Change in value of accounts payable and accrued liabilities     (1,000)    
Change in carrying value of goodwill     (4,800)    
Change in value of total consideration paid     (1,000)    
Acquisition related costs         $ 2,100
Revenue contributed     10,800 32,400  
Intangible assets     68,400 68,400  
Goodwill     $ 76,755 $ 76,755  
VitreosHealth, Inc.          
Business Acquisition [Line Items]          
Aggregate consideration   $ 36,600      
Intangible assets   6,000      
Goodwill   $ 30,200