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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 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 
CommodityNotionalJune 30, 2021December 31, 2020
Natural GasMMBtu2,048 2,880 
ElectricityMWh1,656 1,845 
Trading
CommodityNotionalJune 30, 2021December 31, 2020
Natural GasMMBtu137 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):
Three Months Ended June 30,Six Months Ended June 30,
  2021202020212020
Gain (Loss) on non-trading derivatives, net$18,898 $7,964 $25,952 $(16,569)
Gain (Loss) on trading derivatives, net6 157 (24)103 
Gain (Loss) on derivatives, net18,904 8,121 25,928 (16,466)
Current period settlements on non-trading derivatives (1)
$795 $10,055 $(394)$26,664 
Current period settlements on trading derivatives— (91)4 (92)
Total current period settlements on derivatives$795 $9,964 $(390)$26,572 

(1) Excludes settlements of $(0.3) million, for the six months ended June 30, 2020 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):
  
June 30, 2021
DescriptionGross AssetsGross
Amounts
Offset		Net AssetsCash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives $22,826 $(5,861)$16,965 $(456)$16,509 
Trading commodity derivatives19 — 19 — 19 
Total Current Derivative Assets22,845 (5,861)16,984 (456)16,528 
Non-trading commodity derivatives1,319 (250)1,069 — 1,069 
Trading commodity derivatives— — — — — 
Total Non-current Derivative Assets1,319 (250)1,069 — 1,069 
Total Derivative Assets$24,164 $(6,111)$18,053 $(456)$17,597 
  
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 $— $311 
Schedule of Offsetting Liabilities
DescriptionGross 
Liabilities		Gross
Amounts
Offset		Net
Liabilities		Cash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives$(20)$1 $(19)$— $(19)
Trading commodity derivatives(2)— (2)— (2)
Total Current Derivative Liabilities(22)1 (21)— (21)
Non-trading commodity derivatives— — — — — 
Trading commodity derivatives— — — — — 
Total Non-current Derivative Liabilities— — — — — 
Total Derivative Liabilities$(22)$1 $(21)$— $(21)
DescriptionGross 
Liabilities		Gross
Amounts
Offset		Net
Liabilities		Cash
Collateral
Offset		Net Amount
Presented
Non-trading commodity derivatives$(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)