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Goodwill and Intangible Assets - Summary of Carrying Values of Customer Contract Cost Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Capitalized Contract Cost [Abstract]    
Customer contract costs, Gross Carrying Amount $ 97,949 $ 87,131
Customer contract costs, Accumulated Amortization (50,700) (39,893)
Customer contract costs, Net Amount $ 47,249 $ 47,238