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Segment Reporting - Reconciliation of Retail Gross Margin to Income Before Income Tax Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Income (loss) before income tax expense $ 37,069 $ (29,095)
Interest and other income (48) (86)
Interest expense 1,307 1,311
Operating income 38,328 (27,870)
Depreciation and amortization 5,184 6,036
General and administrative 14,935 12,671
Less:    
Net asset optimization expense (904) (140)
Net, gain on non-trading derivative instruments 45,063 7,024
Net, Cash settlements on non-trading derivative instruments (13,136) (1,185)
Non-recurring event - Winter Storm Uri 0 (64,900)
Retail Gross Margin 28,755 50,012
Gain on non-trading derivatives, net    
Less:    
Net, gain on non-trading derivative instruments 43,916 7,054
Net, Cash settlements on non-trading derivative instruments $ (13,320) $ (1,189)