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Common Shares (Summary Of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, Number of units, beginning of period (in shares) | shares 4,085,446
Vested, Number of units (in shares) | shares (20,570)
Granted, Number of units (in shares) | shares 483,000
Unvested, Number of units, end of period (in shares) | shares 4,547,876
Unvested, weighted average fair value, beginning of year (in dollars per share) | $ / shares $ 0.44
Vested, Weighted average fair value (in dollars per share) | $ / shares 1.68
Granted, Weighted average fair value (in dollars per share) | $ / shares 0.52
Unvested, weighted average fair value, end of year (in dollars per share) | $ / shares $ 0.44
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 1 year