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Derivative Instruments - Derivative Instruments, Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative [Line Items] |  |  |  |
Total realized gains on derivatives, net | $ 86,457 | $ 63,384 | $ 112,682 | $ 107,594
Total unrealized gains (losses) on derivatives, net | 45,487 | 111,117 | 59,343 | (35,918)
Natural gas derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Total realized gains on derivatives, net | 31,609 | 6,689 | 2,358 | (3,685)
Total unrealized gains (losses) on derivatives, net | 25,676 | 67,218 | 49,595 | (43,178)
NGL derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Total realized gains on derivatives, net | 5,857 | (43) | 8,220 | (5,139)
Total unrealized gains (losses) on derivatives, net | 31,922 | 17,789 | (9,411) | 9,727
Power derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Total realized gains on derivatives, net | 60,507 | 65,939 | 123,077 | 133,037
Total unrealized gains (losses) on derivatives, net | (12,316) | 29,434 | 22,525 | (2,119)
Purchased Power Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Total realized gains on derivatives, net | (11,516) | (9,201) | (20,973) | (16,619)
Total unrealized gains (losses) on derivatives, net | $ 205 | $ (3,324) | $ (3,366) | $ (348)

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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(h)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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