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Derivative Instruments - The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: | $ 10,672 | $ 16,684 | $ (30,710) | $ (307)
Unrealized Gain (Loss) on Commodity Derivative Instruments: | 210,909 | 8,976 | 56,915 | 61,054
Gain (Loss) on Commodity Derivative Instruments: | 221,581 | 25,660 | 26,205 | 60,747
Natural Gas | Commodity Member |  |  |  |
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: | 18,567 | 17,058 | (8,383) | 16,624
Unrealized Gain (Loss) on Commodity Derivative Instruments: | 226,845 | 46,450 | 176,084 | 49,250
Gain (Loss) on Commodity Derivative Instruments: | 245,412 | 63,508 | 167,701 | 65,874
Natural Gas | Basis Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: | (7,895) | (374) | (22,327) | (16,931)
Unrealized Gain (Loss) on Commodity Derivative Instruments: | (15,936) | (37,474) | (119,169) | 11,804
Gain (Loss) on Commodity Derivative Instruments: | $ (23,831) | $ (37,848) | $ (141,496) | $ (5,127)

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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=109980867&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=118932676&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=118932676&loc=d3e3602-108585 + Details
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