COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Feb. 25, 2019
Khoemacau
Commitments and Contingencies
Maximum contribution amount	$ 212,000	$ 212,000
Ilovica
Commitments and Contingencies
Maximum future additional payments upon satisfaction of certain conditions	$ 163,750

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant