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Stock-Based Payments - Deferred Share Units Activity (Details)
$ in Thousands
12 Months Ended
Dec. 16, 2016
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock consolidation ratio 0.20      
DSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Beginning Balance (in shares)   30,800    
Granted (in shares)   8,960    
Redeemed (in shares)   (11,360)    
Cancelled (in shares)   0    
Outstanding, Ending Balance (in shares)   28,400 30,800  
Vested at December 31, 2016 (in shares)   28,400    
Cash payments under the DDSU plan | $   $ 105 $ 0 $ 0