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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 02, 2018
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition          
Goodwill     $ 71,258   $ 71,258
Payment of contingent acquisition consideration     $ 1,650 $ 2,034  
Innovative Metering Solutions, Inc.          
Business Acquisition          
Outstanding common stock acquired (as a percent) 100.00%        
Total purchase consideration $ 12,000        
Cash payment 7,700        
Working capital adjustment 300        
Balance sheet holdback 700        
Pre-existing receivables acquired $ 3,300        
Receivables   $ 3,800      
Inventory   800      
Machinery and equipment   100      
Intangibles   3,600      
Goodwill   3,700      
Innovative Metering Solutions, Inc. | Customer Relationships          
Business Acquisition          
Estimated average useful life 10 years        
D-Flow          
Business Acquisition          
Outstanding common stock acquired (as a percent)     100.00%    
Payment of contingent acquisition consideration   $ 1,000      
Contingent payments     $ 2,000