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Fair Value Measurements
3 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
 
    The FASB authoritative guidance regarding fair value measurements establishes a fair-value hierarchy and prioritizes the inputs used in valuation techniques that measure fair value. Those inputs are prioritized into three levels. Level 1 inputs are unadjusted quoted prices in active markets for assets or liabilities that the Company can access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly at the measurement date. Level 3 inputs are unobservable inputs for the asset or liability at the measurement date. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.
 
    The following table sets forth, by level within the fair value hierarchy, the Company's financial assets and liabilities (as applicable) that were accounted for at fair value on a recurring basis as of December 31, 2022 and September 30, 2022.  Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  
Recurring Fair Value MeasuresAt fair value as of December 31, 2022
(Thousands of Dollars)   Level 1Level 2Level 3
Netting
Adjustments(1)
Total(1)
Assets:
 
    
Cash Equivalents – Money Market Mutual Funds$228,919 $— $— $— $228,919 
Hedging Collateral Deposits1,600 — — — 1,600 
Derivative Financial Instruments:     
Over the Counter Swaps – Gas— 9,091 — (6,881)2,210 
Over the Counter No Cost Collars – Gas— 13,915 — (12,274)1,641 
Contingent Consideration for Asset Sale— 8,374 — — 8,374 
Foreign Currency Contracts— 211 — (266)(55)
Other Investments:     
Balanced Equity Mutual Fund14,929 — — — 14,929 
Fixed Income Mutual Fund15,608 — — — 15,608 
Total$261,056 $31,591 $— $(19,421)$273,226 
Liabilities:     
Derivative Financial Instruments:     
Over the Counter Swaps – Gas$— $233,112 $— $(6,881)$226,231 
Over the Counter No Cost Collars – Gas— 116,352 — (12,274)104,078 
Foreign Currency Contracts— 1,478 — (266)1,212 
Total$— $350,942 $— $(19,421)$331,521 
Total Net Assets/(Liabilities)$261,056 $(319,351)$— $— $(58,295)
Recurring Fair Value MeasuresAt fair value as of September 30, 2022
(Thousands of Dollars)   Level 1Level 2Level 3
Netting
Adjustments(1)
Total(1)
Assets:
Cash Equivalents – Money Market Mutual Funds$35,015 $— $— $— $35,015 
Hedging Collateral Deposits91,670 — — — 91,670 
Derivative Financial Instruments:
Over the Counter Swaps – Gas— 5,177 — (4,178)999 
Contingent Consideration for Asset Sale— 8,176 — — 8,176 
Foreign Currency Contracts— 128 — (128)— 
Other Investments:
Balanced Equity Mutual Fund19,506 — — — 19,506 
Fixed Income Mutual Fund33,348 — — — 33,348 
Total$179,539 $13,481 $— $(4,306)$188,714 
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps – Gas$— $517,464 $— $(4,178)$513,286 
Over the Counter No Cost Collars – Gas— 270,453 — — 270,453 
Foreign Currency Contracts— 2,048 — (128)1,920 
Total$— $789,965 $— $(4,306)$785,659 
Total Net Assets/(Liabilities)$179,539 $(776,484)$— $— $(596,945)

(1)Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.
 
Derivative Financial Instruments
 
    The derivative financial instruments reported in Level 2 at December 31, 2022 and September 30, 2022 include natural gas price swap agreements, natural gas no cost collars, and foreign currency contracts, all of which are used in the Company’s Exploration and Production segment. Hedging collateral deposits of $1.6 million (at December 31, 2022) and $91.7 million (at September 30, 2022), which were associated with the price swap agreements, no cost collars and foreign currency contracts, have been reported in Level 1. The fair value of the Level 2 price swap agreements and no cost collars is based on an internal cash flow model that uses observable inputs (i.e. SOFR based discount rates for the price swap agreements and basis differential information, if applicable, at active natural gas and crude oil trading markets). The fair value of the Level 2 foreign currency contracts is determined using the market approach based on observable market transactions of forward Canadian currency rates. 

    The authoritative guidance for fair value measurements and disclosures require consideration of the impact of nonperformance risk (including credit risk) from a market participant perspective in the measurement of the fair value of assets and liabilities.  At December 31, 2022, the Company determined that nonperformance risk associated with the price swap agreements, no cost collars and foreign currency contracts would have no material impact on its financial position or results of operation.  To assess nonperformance risk, the Company considered information such as any applicable collateral posted, master netting arrangements, and applied a market-based method by using the counterparty's (assuming the derivative is in a gain position) or the Company’s (assuming the derivative is in a loss position) credit default swaps rates.
 
    Derivative financial instruments reported in Level 2 at December 31, 2022 also includes the contingent consideration associated with the sale of the Exploration and Production segment's California assets on June 30, 2022, which is discussed at Note 2 – Asset Acquisitions and Divestitures and at Note 5 – Financial Instruments. The fair value of the contingent consideration was calculated using a Monte Carlo simulation model that uses observable inputs, including the ICE Brent closing price as of the valuation date, initial and max trigger price, volatility, risk free rate, time of maturity and counterparty risk.
 
    For the quarters ended December 31, 2022 and December 31, 2021, there were no assets or liabilities measured at fair value and classified as Level 3.