BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Goodwill [Roll Forward]
Goodwill - beginning balance	$ 19,907
Foreign currency translation	(732)
Goodwill - ending balance	19,175
Total accumulated goodwill impairment	(50,861)	$ (50,861)
Europe Caspian
Goodwill [Roll Forward]
Total accumulated goodwill impairment	(33,883)	(33,883)
Africa
Goodwill [Roll Forward]
Total accumulated goodwill impairment	(6,179)	(6,179)
Americas
Goodwill [Roll Forward]
Total accumulated goodwill impairment	(576)	(576)
Corporate and other
Goodwill [Roll Forward]
Total accumulated goodwill impairment	$ (10,223)	$ (10,223)