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DERIVATIVE INSTRUMENTS: (Tables)

9 Months Ended

Sep. 30, 2021

DERIVATIVE INSTRUMENTS:

Schedule of derivative instruments

​

​	​	​	​	​	​	​	​
​	​	Call		​	Financial Swap		​
Derivatives designated as hedging instruments under ASC 815	​	Option		​	Cash Settlement		​
​	​	​	​	​	​	​	​
Commodity contracts	​	​	Natural gas	​	​	Natural gas	​
Gas volume (MMBTUs)	​	​	5,285,000	​	​	5,285,000	​
Fixed price ($)	​	​	3.75	​	​	0.55	​
Total option premium (millions of $)	​		N/A	​	​	2.9	​
Estimated fair value of assets (liabilities) as of September 30, 2021 (millions of $)	​		12.1	​	​	(2.9)	​
Effect of derivative instruments on the consolidated Statement of Earnings (millions of $)	​		—	​	​	—	​
(Favorable) unfavorable effect in OCI - net of deferred income taxes (millions of $)	​	​	(8.4)	​	​	2.0	​

X

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- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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