REVENUE FROM SERVICES - Schedule of Revenue by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from services	$ 35,814	$ 89,537	$ 161,199	$ 182,592
Marine
Disaggregation of Revenue [Line Items]
Revenue from services	6,403	58,536	39,128	90,451
Land
Disaggregation of Revenue [Line Items]
Revenue from services	29,411	31,001	122,071	92,141
North America
Disaggregation of Revenue [Line Items]
Revenue from services	29,326	28,875	120,474	89,428
North America | Land
Disaggregation of Revenue [Line Items]
Revenue from services	29,326	28,875	120,474	89,428
South America
Disaggregation of Revenue [Line Items]
Revenue from services	12	702	9,258	752
South America | Marine
Disaggregation of Revenue [Line Items]
Revenue from services			7,843
South America | Land
Disaggregation of Revenue [Line Items]
Revenue from services	12	702	1,415	752
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from services	74	59,960	25,065	92,412
Asia Pacific | Marine
Disaggregation of Revenue [Line Items]
Revenue from services	1	58,536	24,883	90,451
Asia Pacific | Land
Disaggregation of Revenue [Line Items]
Revenue from services	73	$ 1,424	182	$ 1,961
West Africa
Disaggregation of Revenue [Line Items]
Revenue from services	6,402		6,402
West Africa | Marine
Disaggregation of Revenue [Line Items]
Revenue from services	$ 6,402		$ 6,402