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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Line Items]        
Proceeds from the Sale of Hingham Water System     $ 110,536 $ 0
Disposed of by Sale | Hingham Water System        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, net $ 63,900      
Goodwill 23,600      
Proceeds from the Sale of Hingham Water System $ 110,500      
Pre-tax gain (loss) on sale of property, plant and equipment   $ 16,000    
After-tax gain (loss) on the sale of property, plant and equipment   $ 3,500