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Long-Lived Assets - Summary of Carrying Values of Client Contract Cost Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost [Abstract]    
Client contract costs, Gross Carrying Amount $ 86,520 $ 80,340
Client contract costs, Accumulated Amortization (49,100) (43,051)
Client contract costs, Net Amount $ 37,420 $ 37,289