INVESTMENT IN NUSTAR ENERGY Narrative 2 (Details) - NuStar Energy LP [Member]	Dec. 21, 2016 USD ($) bbl	Jan. 02, 2015 USD ($)
Martin Terminal Acquisition [Member]
Schedule of Equity Method Investments [Line Items]
NuStar Energy's purchase price of acquired entity	$ 95,700,000
Equity method investment, capital expenditure reimbursement	$ 2,100,000
NuStar Energy's acquired crude storage capacity (in barrels) | bbl	900,000
NuStar Energy's acquired refined product storage capacity (in barrels) | bbl	250,000
Linden Acquisition [Member]
Schedule of Equity Method Investments [Line Items]
NuStar Energy's purchase price of acquired entity		$ 142,500,000.0
Equity method investment acquisition, ownership interest before transaction		50.00%