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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Volumetric Underlying Derivative Transactions The following table summarizes the net notional volumes of our open derivative financial instruments accounted for at fair value by commodity. Positive amounts represent net buys while bracketed amounts are net sell transactions (in thousands):
Non-trading 
CommodityNotionalDecember 31, 2021December 31, 2020
Natural GasMMBtu3,862 2,880 
ElectricityMWh1,785 1,845 
Trading
CommodityNotionalDecember 31, 2021December 31, 2020
Natural GasMMBtu1,536 102 
Schedule of Gains (Losses) on Derivative Instruments
Gains (losses) on derivative instruments, net and current period settlements on derivative instruments were as follows for the periods indicated (in thousands):
Year Ended December 31,
  202120202019
Gain (loss) on non-trading derivatives, net$22,130 $(23,439)$(67,955)
(Loss) gain on trading derivatives, net(930)53 206 
Gain (loss) on derivatives, net$21,200 $(23,386)$(67,749)
Current period settlements on non-trading derivatives (1)
(15,752)37,921 42,944 
Current period settlements on trading derivatives60 (192)(124)
Total current period settlements on derivatives (1)
$(15,692)$37,729 $42,820 
(1) Excludes settlements of zero, $0.3 million, and $(0.9) million, respectively, for the years ended December 31, 2021, 2020, and 2019 related to power call options.
Schedule of Offsetting Assets
The following tables summarize the fair value and offsetting amounts of our derivative instruments by counterparty and collateral received or paid (in thousands):
 
  
December 31, 2021
DescriptionGross AssetsGross
Amounts
Offset		Net AssetsCash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives $7,121 $(3,319)$3,802 $— $3,802 
Trading commodity derivatives143 (15)128 — 128 
Total Current Derivative Assets7,264 (3,334)3,930 — 3,930 
Non-trading commodity derivatives411 (71)340 — 340 
Trading commodity derivatives— — — — — 
Total Non-current Derivative Assets411 (71)340 — 340 
Total Derivative Assets$7,675 $(3,405)$4,270 $— $4,270 
  
December 31, 2020
DescriptionGross AssetsGross
Amounts
Offset		Net AssetsCash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives$308 $(105)$203 $— $203 
Trading commodity derivatives112 (4)108 — 108 
Total Current Derivative Assets420 (109)311 — 311 
Non-trading commodity derivatives— — — — — 
Trading commodity derivatives— — — — — 
Total Non-current Derivative Assets— — — — — 
Total Derivative Assets$420 $(109)$311 $— $311 
Schedule of Offsetting Liabilities
DescriptionGross 
Liabilities		Gross
Amounts
Offset		Net
Liabilities		Cash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives$(18,195)$14,504 $(3,691)$491 $(3,200)
Trading commodity derivatives(1,403)445 (958)— (958)
Total Current Derivative Liabilities(19,598)14,949 (4,649)491 (4,158)
Non-trading commodity derivatives(236)200 (36)— (36)
Trading commodity derivatives— — — — — 
Total Non-current Derivative Liabilities(236)200 (36)— (36)
Total Derivative Liabilities$(19,834)$15,149 $(4,685)$491 $(4,194)
DescriptionGross 
Liabilities		Gross
Amounts
Offset		Net
Liabilities		Cash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives$(11,139)$3,620 $(7,519)$86 $(7,433)
Trading commodity derivatives(74)2 (72)— (72)
Total Current Derivative Liabilities(11,213)3,622 (7,591)86 (7,505)
Non-trading commodity derivatives(838)611 (227)— (227)
Trading commodity derivatives— — — — — 
Total Non-current Derivative Liabilities(838)611 (227)— (227)
Total Derivative Liabilities$(12,051)$4,233 $(7,818)$86 $(7,732)