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The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Jun. 30, 2014
Derivative [Line Items] |  |  |  |
Derivative, Cash Received on Hedge | $ (47,103) | $ 84,331 |  |
Unrealized Gain (Loss) on Commodity Derivatives | (22,463) | 55,060 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (389,042) |  | $ (392,556) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 0 | (9,814) |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (9,814) |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 24,640 | (29,271) |  |
Gain (Loss) on Hedging Activity | (22,463) | 55,060 |  |
Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Cash Received on Hedge | (24,607) | 82,146 |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 162,604 | (38,023) |  |
Gain (Loss) on Hedging Activity | 137,997 | 44,123 |  |
Swap [Member] | Cash Flow Hedging [Member] | Natural Gas [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | 0 |  | $ 43,470
Propane [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Cash Received on Hedge | (1,216) | 0 |  |
Basis Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Cash Received on Hedge |  | 2,185 |  |
Derivative, Cost of Hedge Net of Cash Received | (21,280) |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | (139,111) | (6,421) |  |
Gain (Loss) on Hedging Activity | (160,391) | (4,236) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 0 | 15,438 |  |
Gain (Loss) on Hedging Activity | 0 | 15,438 |  |
Natural Gas Liquids [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 1,147 | (265) |  |
Gain (Loss) on Hedging Activity | (69) | (265) |  |
Revenue Mineral Sales [Member] | Swap [Member] | Cash Flow Hedging [Member] | Natural Gas [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 0 | $ 33,656 |  |

X
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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