Segment Reporting - Financial Data for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 131,852	$ 127,154
Retail cost of revenues	117,441	68,707
Gross Profit	14,411	58,447
Less:
Net asset optimization expense	(3,273)	(904)
Net, (loss) gain on non-trading derivative instruments	(42,770)	45,063
Net, Cash settlements on non-trading derivative instruments	20,137	(13,136)
Current period settlements on non-trading derivatives	20,137	(13,136)
Retail Gross Margin	40,330	28,755
Total assets	318,973		$ 330,950
Goodwill	120,343		120,343
(Loss) gain on non-trading derivatives, net
Less:
Net, (loss) gain on non-trading derivative instruments	(42,769)	43,916
Current period settlements on non-trading derivatives	20,123	(13,320)
Operating Segments | Retail Electricity
Segment Reporting Information [Line Items]
Total revenues	82,827	88,041
Retail cost of revenues	80,830	46,160
Gross Profit	1,997	41,881
Less:
Net asset optimization expense	0	0
Retail Gross Margin	20,469	17,186
Total assets	1,929,147		1,802,649
Goodwill	117,813		117,813
Operating Segments | Retail Electricity | (Loss) gain on non-trading derivatives, net
Less:
Net, (loss) gain on non-trading derivative instruments	(36,095)	36,239
Current period settlements on non-trading derivatives	17,623	(11,544)
Operating Segments | Retail Natural Gas
Segment Reporting Information [Line Items]
Total revenues	52,298	40,017
Retail cost of revenues	36,611	22,547
Gross Profit	15,687	17,470
Less:
Net asset optimization expense	0	0
Retail Gross Margin	19,861	11,569
Total assets	141,784		123,490
Goodwill	2,530		2,530
Operating Segments | Retail Natural Gas | (Loss) gain on non-trading derivatives, net
Less:
Net, (loss) gain on non-trading derivative instruments	(6,674)	7,677
Current period settlements on non-trading derivatives	2,500	(1,776)
Corporate and Other
Segment Reporting Information [Line Items]
Total revenues	(3,273)	(904)
Retail cost of revenues	0	0
Gross Profit	(3,273)	(904)
Less:
Net asset optimization expense		(904)
Retail Gross Margin	0	0
Total assets	317,994		313,490
Goodwill	0		0
Corporate and Other | (Loss) gain on non-trading derivatives, net
Less:
Net, (loss) gain on non-trading derivative instruments	0	0
Current period settlements on non-trading derivatives	0	0
Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0
Retail cost of revenues	0	0
Gross Profit	0	0
Less:
Net asset optimization expense	0	0
Retail Gross Margin	0	0
Total assets	(2,069,952)		(1,908,679)
Goodwill	0		$ 0
Eliminations | (Loss) gain on non-trading derivatives, net
Less:
Net, (loss) gain on non-trading derivative instruments	0	0
Current period settlements on non-trading derivatives	$ 0	$ 0