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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]        
Unbilled service fees $ 75,638   $ 65,004 $ 63,247
Unbilled outside vendor costs, billable to clients 22,763   30,133 42,369
Advance billings     171,742 $ 138,505
Deferred Revenue, Additions 24,939   33,237  
Revenue recognized   $ 104,937 121,659  
Contract with Customer, Liability 146,803   $ 171,742  
Revenue, Remaining Performance Obligation, Amount $ 35,771      
Revenue, Remaining Performance Obligation, Current Year, Percentage 87.00%      
Revenue, Remaining Performance Obligation, Year Two, Percentage 11.00%      
Revenue, Remaining Performance Obligation, Year Three, Percentage 2.00%