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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Assets	$ 100,124,000	$ 74,415,000
(Liabilities)	(131,999,000)	(58,749,000)
Derivative, Net Liability Position, Aggregate Fair Value	0
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	100,124,000	66,938,000
(Liabilities)	(131,999,000)	(51,438,000)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	7,477,000
(Liabilities)	0	(7,311,000)
Natural Gas Pipelines
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0	0
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	78,891,000	16,978,000
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	7,477,000
Other Current Assets [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	1,142,000	0
Other Current Assets [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	19,005,000	1,330,000
Other Current Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	(31,793,000)	(42,819,000)
Other Current Liabilities [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	0	(7,311,000)
Other Current Liabilities [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	0	(4,781,000)
Other Current Liabilities [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	(15,012,000)	0
Other Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	1,086,000	0
Other Assets [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	48,630,000
Other Deferred Credits | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	(946,000)	(3,838,000)
Other Deferred Credits | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
(Liabilities)	$ (84,248,000)	$ 0

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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.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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