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Revenue - Contract balances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2018
Contract balances      
Receivables, inclusive of trade and unbilled $ 59,631 $ 48,217  
Contract Assets (current and non-current) 11,278 8,167 $ 11,278
Contract Liabilities (Deferred Revenue current and non-current) $ 44,305 $ 33,752 $ 44,305
Revenue, Practical Expedient, Financing Component [true/false]     true
Contract liabilities increase due to annual renewals     $ 3,100
Minimum      
Contract balances      
The amount of time contract assets are transferred to receivables     3 years
Maximum      
Contract balances      
The amount of time contract assets are transferred to receivables     5 years
Dealflo Limited      
Contract balances      
Deferred revenue     $ 1,400