INVESTMENT IN NUSTAR ENERGY Table 2 (Details) - NuStar Energy LP [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Current assets	$ 250,432	$ 377,183
Property, plant and equipment, net	4,300,933	3,722,283
Goodwill	1,097,475	696,637
Other non-current assets	886,393	234,442
Total assets	6,535,233	5,030,545
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Current liabilities	651,506	289,396
Long-term debt	3,263,069	3,014,364
Other non-current liabilities	140,569	115,168
Total liabilities	4,055,144	3,418,928
NuStar Energy partners' equity	2,480,089	1,611,617
Total liabilities and partners’ equity	$ 6,535,233	$ 5,030,545