FINANCIAL INSTRUMENTS Schedule of Other Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Fair value / carrying value	$ 22,045	$ 16,384
Private investments and unlisted equities
Debt and Equity Securities, FV-NI [Line Items]
Cost	11,339	10,420
Unrealized gains	5,325	265
Unrealized losses	(1,111)	(4)
Fair value / carrying value	15,553	10,681
Investment accounted for under the equity method
Debt and Equity Securities, FV-NI [Line Items]
Fair value / carrying value	$ 6,492	$ 5,703