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Acquisition - United Utilities, Inc. (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 17, 2015
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition      
Goodwill   $ 47,978 $ 47,978
United Utilities, Inc. | National Meter and Automation, Inc.      
Business Acquisition      
Total purchase consideration $ 3,300    
Cash payment 400    
Pre-existing receivables 2,900    
Receivables 800    
Inventory 400    
Property, plant and equipment 100    
Intangibles 1,700    
Goodwill $ 300    
United Utilities, Inc. | National Meter and Automation, Inc. | Customer relationships      
Business Acquisition      
Estimated average useful life (in years)   12 years