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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 02, 2020
Apr. 02, 2018
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
May 01, 2017
Business Acquisition [Line Items]            
Goodwill     $ 88,708 $ 71,258    
GmbH And Subsidiaries            
Business Acquisition [Line Items]            
Date of acquisition Nov. 02, 2020          
Outstanding common stock acquired (as a percent) 100.00%          
Total purchase consideration     30,600      
Cash payment     29,100      
Contingent payments     1,500      
Receivables     3,100      
Inventory     4,300      
Other assets     1,200      
Intangibles     12,700      
Goodwill     17,400      
Accounts payable     3,600      
Deferred tax liabilities     3,200      
Other liabilities     1,300      
Fair value of assets acquired     $ 0      
GmbH And Subsidiaries | Customer relationships            
Business Acquisition [Line Items]            
Estimated average useful life     12 years      
Innovative Metering Solutions, Inc.            
Business Acquisition [Line Items]            
Outstanding common stock acquired (as a percent)   100.00%        
Total purchase consideration   $ 12,000        
Cash payment   7,700        
Receivables         $ 3,800  
Inventory         800  
Intangibles         3,600  
Goodwill         3,700  
Working capital adjustment   300        
Balance sheet holdback   700        
Pre-existing receivables acquired   $ 3,300        
Machinery and equipment         $ 100  
Innovative Metering Solutions, Inc. | Customer relationships            
Business Acquisition [Line Items]            
Estimated average useful life   10 years        
D-Flow            
Business Acquisition [Line Items]            
Outstanding common stock acquired (as a percent)           100.00%
Contingent payments           $ 1,000