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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Business Acquisition        
Goodwill   $ 71,258   $ 71,258
Payment of contingent acquisition consideration   1,000 $ 0  
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