Share-Based Compensation (Schedule Of Stock Option Outstanding) (Details) (CAD) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Exercisable	284
Options Outstanding, Remaining Contractual Life (years)	1.7
Options Outstanding, Weighted Exercise Price	20.47
Options Exercisable, Number Exercisable	284
Options Exercisable, Weighted Exercise Price	20.47
Range I [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	3.50
Options Outstanding, Number Exercisable	75
Options Outstanding, Remaining Contractual Life (years)	3.6
Options Outstanding, Weighted Exercise Price	3.50
Options Exercisable, Number Exercisable	75
Options Exercisable, Weighted Exercise Price	3.50
Range II [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	18.48
Options Outstanding, Number Exercisable	50
Options Outstanding, Remaining Contractual Life (years)	2.3
Options Outstanding, Weighted Exercise Price	18.48
Options Exercisable, Number Exercisable	50
Options Exercisable, Weighted Exercise Price	18.48
Range III [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	28.98
Options Outstanding, Number Exercisable	134
Options Outstanding, Remaining Contractual Life (years)	0.6
Options Outstanding, Weighted Exercise Price	28.98
Options Exercisable, Number Exercisable	134
Options Exercisable, Weighted Exercise Price	28.98
Range IV [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	29.95
Options Outstanding, Number Exercisable	25
Options Outstanding, Remaining Contractual Life (years)	0.1
Options Outstanding, Weighted Exercise Price	29.95
Options Exercisable, Number Exercisable	25
Options Exercisable, Weighted Exercise Price	29.95