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Fair Value Measurements - Fair Value For Our Risk Management Activities (Details) - Commodity Contracts - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net derivative balance at beginning of period $ (4,888) $ (2,738)
Deferred as a regulatory asset or liability (30,427) 16,807
Settlements 41,937 (4,419)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 0
Net derivative balance at end of period 6,622 9,650
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0