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Stock Based Compensation (Details) (CAD)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of options outstanding      
Number of options outstanding, Beginning Balance 11,142,450 7,150,544 5,492,290
Weighted average exercise price outstanding, Beginning Balance 34.22 34.26 41.01
Number of options exercisable outstanding, Beginning Balance 3,362,116 4,988,544 5,448,290
Number of options, Granted   6,341,000 2,150,000
Weighted average exercise price, Granted   34.04 16.55
Number of options, Exercised (2,737,253) (1,504,616) (93,578)
Weighted average exercise price, Exercised 33.28 34.31 31.51
Number of options exercisable, Exercised (2,737,253) (1,504,616) (93,578)
Number of options, Cancelled (1,585,830) (844,478) (398,168)
Weighted average exercise price, Cancelled 47.64 33.04 32.36
Number of options exercisable, Cancelled (1,474,164) (844,478) (378,168)
Number of options, Vested 0 0 0
Weighted average exercise price, Vested 0.00 0.00 0.00
Number of options exercisable, Vested 2,868,001 722,666 12,000
Number of options outstanding, Ending Balance 6,819,367 11,142,450 7,150,544
Weighted average exercise price outstanding, Ending Balance 31.48 34.22 34.26
Number of options exercisable outstanding, Ending Balance 2,018,700 3,362,116 4,988,544