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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Operating Segment Reporting
Revenue	$ 32,691	$ 26,896	$ 84,657	$ 101,743
Long-lived Assets	550,325		550,325		$ 557,565
Investment in MSC	116,994		116,994		127,814
Canada
Operating Segment Reporting
Revenue	11,147	11,395	36,139	46,444
Long-lived Assets	78,770		78,770		84,119
Mexico
Operating Segment Reporting
Revenue	4,967	$ 15,501	19,577	$ 55,299
Long-lived Assets	25,671		25,671		26,524
United States
Operating Segment Reporting
Revenue	16,577		28,941
Long-lived Assets	137,400		137,400		127,617
Argentina
Operating Segment Reporting
Long-lived Assets	$ 308,484		$ 308,484		$ 319,305