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Acquisitions - Schedule of Cash Paid and Acquired for Acquisitions (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Business Combination, Separately Recognized Transactions [Line Items]        
Cash acquired $ (2,064) $ (980) $ (2,523) $ (7,774)
Net cash paid $ 68,920 $ 9,662 $ 34,054 $ 135,264
Series of Individually Immaterial Business Acquisitions        
Business Combination, Separately Recognized Transactions [Line Items]        
Number of acquisitions 4,000   4,000 7
Cash paid at closing $ 70,984   $ 36,577 $ 143,038
Cash acquired (2,064)   (2,523) (7,774)
Net cash paid 68,920   $ 34,054 $ 135,264
Escrow deposit $ 3,413