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Acquisitions - Fair Value Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets acquired and liabilities assumed        
Goodwill $ 542,239 $ 480,065 $ 446,318 $ 336,982
Series of Individually Immaterial Business Acquisitions        
Finite-Lived Intangible Assets [Line Items]        
Cash paid at closing 70,984 36,577 143,038  
Contingent consideration from acquisitions 1,902 4,498 13,456  
Deferred payment obligations to sellers     690  
Total consideration 72,745 41,075 157,184  
Assets acquired and liabilities assumed        
Cash   2,523 7,774  
Prepaid and other current assets 5,671 1,782 4,790  
Property and equipment 172 411 340  
Other assets 36 84    
Total identifiable assets acquired excluding goodwill 23,922 15,338 52,986  
Deferred tax liability (1,005) (1,869) (8,917)  
Other current liabilities (2,458) (3,538) (3,848)  
Deferred revenues (4,274) (2,897) (6,181)  
Total liabilities assumed (9,492) (8,304) (18,946)  
Net identifiable assets acquired excluding goodwill 14,430 7,034 34,040  
Goodwill 58,315 34,041 123,144  
Net assets acquired 72,745 41,075 157,184  
Goodwill amount expected to be deductible for tax purposes $ 24,085 6,501    
Customer relationships        
Assets acquired and liabilities assumed        
Weighted average useful life 7 years      
Customer relationships | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 8,854 6,534 27,294  
Software And Technology [Member] | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 2,423 9,332  
Weighted average useful life   3 years    
In Process Research and Development [Member] | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     1,366  
Non-compete agreement | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 150    
Weighted average useful life   5 years    
Trademarks | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 3,050 $ 1,431 $ 2,090  
Minimum | Customer relationships | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Weighted average useful life   5 years    
Minimum | Trademarks | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Weighted average useful life   5 years    
Maximum | Customer relationships | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Weighted average useful life   7 years    
Maximum | Trademarks | Series of Individually Immaterial Business Acquisitions        
Assets acquired and liabilities assumed        
Weighted average useful life   7 years