OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Segment Reporting
Revenue	$ 15,640	$ 41,285	$ 41,285
Long-lived Assets	563,316		557,565
Investment in MSC	123,484		127,814
Canada
Operating Segment Reporting
Revenue	8,943		15,868
Long-lived Assets	83,798		84,119
Mexico
Operating Segment Reporting
Revenue	5,798		25,417
Long-lived Assets	25,873		26,524
United States
Operating Segment Reporting
Revenue	899
Long-lived Assets	138,670		127,617
Argentina
Operating Segment Reporting
Long-lived Assets	$ 314,975		$ 319,305

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

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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