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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (178,589) |  | $ (178,589) |  | $ (188,530)
Cash Flow Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net |  | $ (5,997) |  | $ 22,860 |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net | (26,323) |  | 18,513 |  |
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income |  | (11,968) |  | (32,616) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net | (15,791) |  | (31,345) |  |
Commodity Contract [Member] | Cash Flow Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized Gain (Loss) On Cash Flow Hedges Net Of Tax Accumulated Other Comprehensive Income Loss | (29,300) |  | (29,300) |  |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | (25,300) |  | (25,300) |  |
Commodity Cash Flow Hedge Gain (Loss) To Be Reclassified After Next 12 Months Net | (4,000) |  | (4,000) |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net |  | 8,998 |  | 36,326 |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net | (46,388) |  | (25,463) |  |
Commodity Contract [Member] | Commodity sales revenues | Cash Flow Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income |  | (6,796) |  | (22,115) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net | (10,189) |  | (21,800) |  |
Interest Rate Contract [Member] | Cash Flow Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. | (47,300) |  | (47,300) |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | (13,600) |  | (13,600) |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net |  | (14,995) |  | (13,466) |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net | 20,065 |  | 43,976 |  |
Interest Rate Contract [Member] | Interest expense | Cash Flow Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income |  | $ (5,172) |  | $ (10,501) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net | $ (5,602) |  | $ (9,545) |  |

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- Definition Amount of unrealized gain (loss) related to the increase or decrease in fair value of derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective, net of tax. + References No definition available. + Details
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- 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=84228862&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=84228862&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=84228862&loc=SL7669686-108580 + Details
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