GEOGRAPHIC AND RELATED INFORMATION - Revenues and Identifiable Assets by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	$ 205,564	$ 228,137
Identifiable Assets	66,195	69,316
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	86,967	173,416
Identifiable Assets	59,086	58,714
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	77,626	162,066
Identifiable Assets	55,282	54,664
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	9,341	11,350
Identifiable Assets	3,804	4,050
South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	116,542	27,252
Identifiable Assets	6,228	9,289
Peru
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	252	15,218
Identifiable Assets	495	1,878
Colombia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	37,394	7,065
Identifiable Assets	2,644	3,970
Bolivia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	76,928	2,822
Identifiable Assets	922	1,051
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	1,968	2,147
Identifiable Assets	2,167	2,390
Southeast Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	1,734	27,469
Identifiable Assets	881	1,313
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	1,734	27,469
Identifiable Assets	875	1,300
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	0	0
Identifiable Assets	6	13
West Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	321	0
Identifiable Assets	0	0
Nigeria
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	321	0
Identifiable Assets	0	0
Total excluding United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Services	127,938	66,071
Identifiable Assets	$ 10,913	$ 14,652