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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative, Fair Value [Line Items] |  |
Assets | $ 120,397 | $ 110,498
(Liabilities) | (271,919) | (349,018)
Derivative, Net Liability Position, Aggregate Fair Value | 0 |
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 54,400 | 35,100
Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 114,150 | 107,461
(Liabilities) | (265,732) | (345,980)
Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 6,247 | 3,037
(Liabilities) | (6,187) | (3,038)
Natural Gas Pipelines |  |
Derivative, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 0 | 0
Other Current Assets [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 241 | 0
Other Current Liabilities [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
(Liabilities) | (65,329) | 0
Other Deferred Credits | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 0 | 0
(Liabilities) | (32,034) | (203,407)
Fully Netted Assets/Liabilities | Commodity Contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 113,909 | 107,461
(Liabilities) | (168,369) | (142,573)
Fully Netted Assets/Liabilities | Commodity Contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivative, Fair Value [Line Items] |  |
Assets | 6,247 | 3,037
(Liabilities) | $ (6,187) | $ (3,038)

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