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Revenue - Change in contract balances (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Contract asset:  
Contract asset, beginning of period $ 1,842
Decreases due to cash received (1,949)
Increases, net of reclassifications to receivables 6,964
Contract asset, end of period 6,857
Contract liability  
Contract liability, beginning of period 1,350
Revenue recognized that was included in the contract liability balance at the beginning of the period (1,278)
Increases due to cash received, excluding amounts recognized as revenue during the period 3,306
Increases due to business combination 948
Revenue recognized from business combinations that was included in the contract liability balance on the acquisition date (86)
Contract liability end of period $ 4,240