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Long-Lived Assets - Summary of Carrying Values of Client Contract Cost Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Capitalized Contract Cost [Abstract]    
Client contract costs, Gross Carrying Amount $ 84,244 $ 82,272
Client contract costs, Accumulated Amortization (39,206) (31,526)
Client contract costs, Net Amount $ 45,038 $ 50,746