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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Operating Segment Reporting
Long-lived Assets	$ 446,368		$ 445,624
Revenue	23,740	$ 31,400
Investment in MSC	102,768		108,326
Lease assets	800
MSC
Operating Segment Reporting
Revenue	53,303	37,390
Investment in MSC	102,768		108,326	$ 110,183
USA
Operating Segment Reporting
Long-lived Assets	46,280		46,801
Revenue	12,893	14,317
Canada
Operating Segment Reporting
Long-lived Assets	85,811		78,986
Revenue	8,561	12,739
Mexico
Operating Segment Reporting
Long-lived Assets	20,018		20,021
Revenue	2,286	$ 4,344
Argentina
Operating Segment Reporting
Long-lived Assets	294,259		299,816
Argentina | MSC
Operating Segment Reporting
Investment in MSC	$ 102,800		$ 108,300

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Amount of investment in equity method investee and investment in and advance to affiliate.

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