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Derivative Instruments
9 Months Ended
Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table presents the absolute notional amounts related to open positions on NW Natural derivative instruments:
September 30,December 31,
In thousands202320222022
Natural gas (in therms):
Financial1,080,345 1,006,665 852,435 
Physical749,838 672,350 463,254 
Foreign exchange$10,483 $9,905 $7,617 
Income Statement Presentation of Derivative Instruments The following table reflects the income statement presentation for the unrealized gains and losses from NW Natural's derivative instruments: