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Acquisition (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 17, 2015
Sep. 30, 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    
Settlement $ 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   12 years