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Business Combinations - Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 17, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Goodwill $ 25,188   $ 7,576 $ 8,045
FSE Acquisition        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Accounts receivable   $ 6,567    
Inventories   3,140    
Prepaid and other current assets   353    
Property, plant and equipment   503    
Other long-term assets   1,650    
Definite-lived intangible assets   17,190    
Goodwill   17,675    
Accounts payable and accrued liabilities   (7,204)    
Other long-term liabilities   (1,174)    
Total consideration   $ 38,700