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Revenue - Contract balances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Contract balances      
Revenue recognized that was included in the balance sheet $ 21,400    
Contract Assets (current and non-current)   $ 10,622 $ 8,595
Contract Liabilities (Deferred Revenue current and non-current)   $ 48,451 $ 45,597
Revenue, Practical Expedient, Financing Component [true/false] true    
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