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Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - CAD / $
Dec. 31, 2016
Oct. 14, 2016
Oct. 13, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]        
Foreign exchange rate (CAD per USD) 1.34 1.32 1.32 1.38
Weighted Average        
Schedule of Equity Method Investments [Line Items]        
Foreign exchange rate (CAD per USD) 1.33     1.28