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Derivative Instruments - The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments | $ 90,310 | $ 57,041 | $ 383,727 | $ 26,331
Unrealized (Loss) Gain on Commodity Derivative Instruments | (259,144) | 156,872 | (500,722) | 213,787
(Loss) Gain on Derivative Instruments | (168,834) | 213,913 | (116,995) | 240,118
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Cash (Paid) Received in Settlement of Interest Rate Swaps | (1,257) | 195 | (1,850) | 195
Unrealized Loss on Interest Rate Swaps | (152) | (713) | (14,389) | (1,774)
(Loss) Gain on Derivative Instruments | (1,409) | (518) | (16,239) | (1,579)
Natural Gas | Commodity Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments | 72,062 | 61,441 | 382,891 | 53,058
Unrealized (Loss) Gain on Commodity Derivative Instruments | (369,121) | 126,617 | (550,694) | 302,701
(Loss) Gain on Derivative Instruments | (297,059) | 188,058 | (167,803) | 355,759
Natural Gas | Basis Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments | 18,248 | (4,400) | 836 | (26,727)
Unrealized (Loss) Gain on Commodity Derivative Instruments | 109,977 | 30,255 | 49,972 | (88,914)
(Loss) Gain on Derivative Instruments | $ 128,225 | $ 25,855 | $ 50,808 | $ (115,641)

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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds. + References Reference 1: 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=121586364&loc=d3e3602-108585 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + 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 derivative instruments, including options, swaps, futures, and forward 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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