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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)

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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