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Acquisitions (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 01, 2019
USD ($)
employee
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]      
Business acquisition cash purchase price, net of cash acquired     $ 2,356
Cubic Creative, Inc.[Member]      
Business Acquisition [Line Items]      
Cash acquired from acquisition $ 213    
Business combination, transaction costs 92    
Business combination, transaction costs incurred   $ 0 $ 86
Cubic Creative, Inc.[Member] | Tulsa, Oklahoma [Member]      
Business Acquisition [Line Items]      
Business acquisition cash purchase price, net of cash acquired $ 2,356    
Business combination number of employees in acquired business | employee 25