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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 01, 2018
Mar. 15, 2018
Sep. 30, 2018
Sep. 30, 2018
Business Acquisition [Line Items]        
Payments to acquire assets   $ 15,549    
Contingent consideration     $ 7,100 $ 7,100
Change in contingent consideration fair value     (2,100)  
Quickthree Solutions        
Business Acquisition [Line Items]        
Purchase agreement amount $ 30,000      
Consideration transferred, adjustment $ 12,750      
Adjustment period 3 years     3 years
Acquisition costs     $ 0 $ 1,159
Contingent consideration $ 9,200