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DERIVATIVE INSTRUMENTS: (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) item $ / item	Dec. 31, 2020 item	Dec. 31, 2019 item
Derivatives designated as hedging instruments under ASC 815
Number of derivative contracts entered | item	2
Derivative instruments held | item		0	0
Call Option | Natural Gas | Derivatives designated as hedging instruments
Derivatives designated as hedging instruments under ASC 815
Gas volume (MMBTUs)	5,285,000
Fixed price ($) | $ / item	0.55
Total option premium (millions of $) | $ / item	1.7
Estimated fair value of assets (liabilities) as of December 31, 2021 (millions of $)	$ (900,000)
(Favorable) unfavorable effect of derivative instruments on the consolidated Statement of Earnings (millions of $)	1,200,000
(Favorable) unfavorable effect in OCI - net of deferred income taxes (millions of $)	$ (600,000)
Swap contracts | Natural Gas | Derivatives designated as hedging instruments
Derivatives designated as hedging instruments under ASC 815
Gas volume (MMBTUs)	5,285,000
Fixed price ($) | $ / item	3.75
Estimated fair value of assets (liabilities) as of December 31, 2021 (millions of $)	$ 100,000
(Favorable) unfavorable effect of derivative instruments on the consolidated Statement of Earnings (millions of $)	(3,000,000.0)
Swap contracts | Natural Gas | Derivatives designated as hedging instruments | Maximum
Derivatives designated as hedging instruments under ASC 815
(Favorable) unfavorable effect in OCI - net of deferred income taxes (millions of $)	$ 100,000

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The number of derivative contracts entered into during the period.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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Nominal number of units used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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Fixed price related to the price risk swap derivative.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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