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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Unbilled service fees $ 78 $ 54
Unbilled outside vendor costs, billable to clients 59,081 31,146
Advance billings 184,269 $ 148,133
Increase in advance billings 36,136  
Revenue recognized $ 58,888