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INCOME TAXES - Schedule of Capital Losses and Net Operating Losses (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Loss Carryforwards [Line Items]  
Net operating losses expected to expire $ 75,000
Capital losses | United States  
Operating Loss Carryforwards [Line Items]  
Amount 54,399
Net operating losses | United States  
Operating Loss Carryforwards [Line Items]  
Amount 250,518
CANADA | Non-capital losses | Canada  
Operating Loss Carryforwards [Line Items]  
Amount 31,159
CANADA | Capital losses | Canada  
Operating Loss Carryforwards [Line Items]  
Amount 3,285
CANADA | Investment Tax Credits | Canada  
Operating Loss Carryforwards [Line Items]  
Amount $ 1,211