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Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Payments to acquire businesses   $ 6,000 $ 0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Goodwill   $ 3,677   $ 0
WattMaster        
Business Acquisition [Line Items]        
Payments to acquire businesses $ 6,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Accounts receivable 1,073      
Inventories 1,442      
Property, plant and equipment 133      
Goodwill 3,677      
Assumed current liabilities (325)      
Consideration paid $ 6,000