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OPERATING SEGMENTS - Long Lived Assets by Geographic Areas (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Non-current assets $ 774,695 $ 719,139
Canada    
Disclosure of geographical areas [line items]    
Non-current assets 357,783 348,455
United States    
Disclosure of geographical areas [line items]    
Non-current assets 236,054 224,612
Argentina    
Disclosure of geographical areas [line items]    
Non-current assets 113,534 79,250
Mexico    
Disclosure of geographical areas [line items]    
Non-current assets 66,749 66,131
Other    
Disclosure of geographical areas [line items]    
Non-current assets $ 575 $ 691