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Common Shares (Summary Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Capital Stock [Abstract]    
Number of options, beginning of period (in shares) 2,257,500  
Number of options, Expired (in shares) (667,500)  
Number of options, end of period (in shares) 1,590,000 2,257,500
Number of options, Exercisable (in shares) 1,343,750  
Weighted average exercise price per option, beginning of period (in dollars per share) $ 1.60  
Weighted average exercise price per option, Expired (in dollars per share) 2.87  
Weighted average exercise price per option, end of period (in dollars per share) 1.07 $ 1.60
Weighted average exercise price, Exercisable (in dollars per share) $ 1.20  
Weighted average remaining contractual term, Outstanding 2 years 2 months 5 days 2 years 7 days
Weighted average remaining contractual term, Exercisable 2 years 1 month 17 days  
Aggregate intrinsic value, Outstanding, end of period (in dollars) $ 1,770  
Aggregate intrinsic value, Options, Exercisable $ 1,388