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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative, Fair Value [Line Items] |  |
Assets | $ 104,638,000 | $ 74,415,000
(Liabilities) | (102,360,000) | (58,749,000)
Derivative, Net Liability Position, Aggregate Fair Value | 0 |
Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 100,381,000 | 66,938,000
(Liabilities) | (98,122,000) | (51,438,000)
Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 4,257,000 | 7,477,000
(Liabilities) | (4,238,000) | (7,311,000)
Natural Gas Pipelines [Member] |  |
Derivative, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 0 | 0
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 46,411,000 | 16,978,000
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 4,257,000 | 7,477,000
Other Current Assets [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 0 | 0
Other Current Assets [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 0 | 1,330,000
Other Current Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (84,174,000) | (42,819,000)
Other Current Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (4,238,000) | (7,311,000)
Other Current Liabilities [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (1,898,000) | (4,781,000)
Other Current Liabilities [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | 0 | 0
Other Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 3,461,000 | 0
Other Assets [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 0 | 0
Other Assets [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 50,509,000 | 48,630,000
Other Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (11,938,000) | (3,838,000)
Other Liabilities [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (112,000) | 0
Other Liabilities [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | $ 0 | $ 0

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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