VARIABLE INTEREST ENTITIES (VIEs) (Narrative) (Details) $ in Thousands	Jun. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Number of commercial pools	5
Number of joint ventures	2
Accounts receivable, net, current | $	$ 100,876	$ 83,845
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of commercial pools	2
Number of joint ventures	2
Variable Interest Entity, Not Primary Beneficiary [Member] | FSO Joint Venture [Member]
Variable Interest Entity [Line Items]
Number of commercial pools	2
Accounts receivable, net, current | $	$ 21,100