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DERIVATIVE INSTRUMENTS: (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) MMBbls item $ / item | Dec. 31, 2020 item
Derivatives designated as hedging instruments under ASC 815 |  |
Number of derivative contracts entered | item | 2 |
Derivative instruments held | item |  | 0
Call Option | Natural Gas | Derivatives designated as hedging instruments |  |
Derivatives designated as hedging instruments under ASC 815 |  |
Gas volume (MMBTUs) | MMBbls | 5,285,000 |
Fixed price ($) | $ / item | 3.75 |
Estimated fair value of assets (liabilities) as of September 30, 2021 (millions of $) | $ 12.1 |
(Favorable) unfavorable effect in OCI - net of deferred income taxes (millions of $) | $ (8.4) |
Swap contracts | Natural Gas | Derivatives designated as hedging instruments |  |
Derivatives designated as hedging instruments under ASC 815 |  |
Gas volume (MMBTUs) | MMBbls | 5,285,000 |
Fixed price ($) | $ / item | 0.55 |
Total option premium (millions of $) | $ / item | 2.9 |
Estimated fair value of assets (liabilities) as of September 30, 2021 (millions of $) | $ (2.9) |
(Favorable) unfavorable effect in OCI - net of deferred income taxes (millions of $) | $ 2.0 |

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