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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative, Fair Value [Line Items] |  |
Assets | $ 53,717,000 | $ 74,415,000
(Liabilities) | (67,467,000) | (58,749,000)
Derivative, Net Liability Position, Aggregate Fair Value | 0 |
Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 48,496,000 | 66,938,000
(Liabilities) | (62,286,000) | (51,438,000)
Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 5,221,000 | 7,477,000
(Liabilities) | (5,181,000) | (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 | 18,492,000 | 16,978,000
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 5,221,000 | 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) | (49,476,000) | (42,819,000)
Other Current Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (5,181,000) | (7,311,000)
Other Current Liabilities [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (1,854,000) | (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 | 408,000 | 0
Other Assets [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 29,596,000 | 48,630,000
Other Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (5,666,000) | (3,838,000)
Other Liabilities [Member] | Interest-rate contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | $ (5,290,000) | $ 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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