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BUSINESS, PRESENTATION, AND RECENT ACCOUNTING PRONOUNCEMENTS (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant, and Equipment $ 37,418 [1] $ 20,403
United States [Member]    
Property, Plant, and Equipment 23,645 20,403
Canada [Member]    
Property, Plant, and Equipment $ 13,773 $ 0
[1] Includes property, plant, and equipment acquired in acquisition of WellSpring (Note 3).