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DERIVATIVE INSTRUMENTS (Schedule of Notional Amounts of Outstanding Derivatives) (Details) - Designated as Hedging Instrument [Member]
gal in Millions, MMcf in Millions
3 Months Ended
Sep. 30, 2019
gal
MMcf
Dec. 31, 2018
gal
MMcf
Natural Gas [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | MMcf 7.0 1.8
Diesel [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | gal 2.4 11.0