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Business Combinations - Consideration Transferred (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 31, 2021
Aug. 16, 2021
Sep. 30, 2021
Sep. 30, 2020
Business Combination        
Acquisitions of businesses     $ 209,854 $ 0
Zio        
Business Combination        
Acquisitions of businesses   $ 117,198    
Contingent consideration   22,800    
Total consideration   $ 139,998    
Star Waggons        
Business Combination        
Acquisitions of businesses $ 92,656      
Contingent consideration 0      
Total consideration $ 92,656