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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 02, 2018
Nov. 01, 2017
May 01, 2017
Oct. 20, 2016
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition            
Goodwill         $ 71,258 $ 67,424
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          
Carolina Meter            
Business Acquisition            
Total purchase consideration   $ 6,300        
Cash payment   2,100        
Pre-existing receivables acquired   4,200        
Receivables   600        
Inventory   200        
Intangibles   3,300        
Goodwill   $ 2,200        
Carolina Meter | Customer Relationships            
Business Acquisition            
Estimated average useful life   12 years        
D-Flow            
Business Acquisition            
Outstanding common stock acquired (as a percent)     100.00%      
Cash payment     $ 23,200   $ 2,000  
Receivables     300      
Inventory     600      
Machinery and equipment     200      
Intangibles     10,900      
Goodwill     16,100      
Contingent payments     3,000      
Liabilities assumed as part of the acquisition     $ 4,900      
Nice Instruments            
Business Acquisition            
Total purchase consideration       $ 2,000