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Acquisition and Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                
Goodwill $ 82,104   $ 82,104 $ 82,104 $ 82,104     $ 74,659
Geminus                
Business Acquisition [Line Items]                
Percentage of acquisition   100.00%            
Purchase price   $ 8,371            
Cash payments to acquire businesses   7,700            
Liabilities incurred $ 100 700            
Goodwill   7,445            
Intangible assets acquired   $ 5,700         $ 5,700  
Acquisition-related expenses     $ 0   $ 0 $ 0    
Revenue of acquiree since acquisition date       6,800        
Earnings or loss of acquiree since acquisition date       $ 600