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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INVESTMENTS IN EQUTIY SECURITIES (Details) shares in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
	Nov. 26, 2018	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Oct. 01, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in equity securities				$ 32,900
Accumulated other comprehensive loss, net of tax		$ (15,822)		(12,610)
Equity securities, fv-ni, unrealized gain (loss)		257		3,400
Investments in equity securities		33,174		$ 32,917
Debt conversion ratio	0.2492
Proceeds from sale of investments in equity securities, net		$ 0	$ 6,616
Pre-tax gain on sale of equity securities			$ 5,300
Investments in Equity Securities
Schedule of Equity Method Investments [Line Items]
Accumulated other comprehensive loss, net of tax					$ 4,700
Common Units [Member]
Schedule of Equity Method Investments [Line Items]
Other ownership interests, units issued | shares		1,840
Dominion Shares [Member]
Schedule of Equity Method Investments [Line Items]
Other ownership interests, units issued | shares		458

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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.

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