Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity and Capital Stock - o/s RSUs (Details)

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Shareholders' Equity and Capital Stock - o/s RSUs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 11, 2015
Aug. 17, 2015
Mar. 13, 2015
Dec. 12, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
RSUs                
Number of unvested units         860,095 379,435 691,610 826,425
Remaining life (years)         1 year 3 months 29 days      
Aggregate Intrinsic Value         $ 552      
Grant Date One [Member]                
RSUs                
Grant date       Dec. 12, 2014        
Number of unvested units       110,485        
Remaining life (years)       11 months 12 days        
Aggregate Intrinsic Value       $ 71        
Grant Date Two [Member]                
RSUs                
Grant date     Mar. 13, 2015          
Number of unvested units     233,608          
Remaining life (years)     1 year 2 months 12 days          
Aggregate Intrinsic Value     $ 150          
Grant Date Three [Member]                
RSUs                
Grant date   Aug. 17, 2015            
Number of unvested units   205,570            
Remaining life (years)   1 year 7 months 17 days            
Aggregate Intrinsic Value   $ 132            
Share-Based Compensation Arrangement By Share-Based Number Four Member                
RSUs                
Grant date Dec. 11, 2015              
Number of unvested units 310,432              
Remaining life (years) 1 year 11 months 12 days              
Aggregate Intrinsic Value $ 199