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Long-Lived Assets - Summary of Carrying Values of Client Contract Cost Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Capitalized Contract Cost [Abstract]    
Client contract costs, Gross Carrying Amount $ 86,611 $ 82,272
Client contract costs, Accumulated Amortization (34,644) (31,526)
Client contract costs, Net Amount $ 51,967 $ 50,746