REVENUE FROM SERVICES - Schedule of Revenue by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from services	$ 2,171	$ 23,274	$ 163,370	$ 205,866
Marine
Disaggregation of Revenue [Line Items]
Revenue from services	8	332	39,136	90,783
Land
Disaggregation of Revenue [Line Items]
Revenue from services	2,163	22,942	124,234	115,083
North America
Disaggregation of Revenue [Line Items]
Revenue from services	2,163	20,481	122,637	109,910
North America | Land
Disaggregation of Revenue [Line Items]
Revenue from services	2,163	20,481	122,637	109,910
South America
Disaggregation of Revenue [Line Items]
Revenue from services		2,160	9,222	2,911
South America | Marine
Disaggregation of Revenue [Line Items]
Revenue from services			7,807
South America | Land
Disaggregation of Revenue [Line Items]
Revenue from services		2,160	1,415	2,911
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from services	8	633	25,155	93,045
Asia Pacific | Marine
Disaggregation of Revenue [Line Items]
Revenue from services	$ 8	332	24,973	90,783
Asia Pacific | Land
Disaggregation of Revenue [Line Items]
Revenue from services		$ 301	182	$ 2,262
West Africa
Disaggregation of Revenue [Line Items]
Revenue from services			6,356
West Africa | Marine
Disaggregation of Revenue [Line Items]
Revenue from services			$ 6,356