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Acquisition and Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
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 business   7,700            
Liabilities incurred $ 200 700            
Goodwill   7,445            
Intangible assets acquired   $ 5,700            
Acquisition-related expenses     $ 0 $ 0   $ 0 $ 0  
Revenue of acquiree since acquisition date         3,700      
Earnings or loss of acquiree since acquisition date         $ 600