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DEBT - SALE-LEASEBACKS (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Debt Instrument [Line Items]          
Proceeds from sale-leaseback transaction     $ 7,820 $ 9,587 $ 7,107
Natural Gas Distribution          
Debt Instrument [Line Items]          
Sale leaseback transaction, lease term     25 years 6 months    
Sale leaseback transaction, lease renewal term     5 years    
Sale leaseback transaction, maximum lease renewal term (as a percent)     4    
Proceeds from sale-leaseback transaction $ 7,800 $ 9,600     7,100
Sale leaseback transaction, other payments required     $ 2,200 $ 2,400 $ 1,900