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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule of Notional Amounts of Outstanding Derivatives) (Details)

v3.19.2
DERIVATIVE INSTRUMENTS (Schedule of Notional Amounts of Outstanding Derivatives) (Details)
gal in Millions, MMcf in Millions
Jun. 30, 2019
gal
MMcf
Dec. 31, 2018
gal
MMcf
Natural Gas [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Investment Contract Volume | MMcf 9.0 1.8
Diesel [Member] Ìý Ìý
Derivative [Line Items] Ìý Ìý
Investment Contract Volume | gal 5.0 11.0