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SHAREHOLDERS' EQUITY (Details)
3 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Sep. 30, 2011
CAD
Mar. 31, 2011
USD ($)
frequency
Sep. 30, 2010
USD ($)
Sep. 30, 2010
CAD
Mar. 31, 2010
USD ($)
frequency
Sep. 30, 2011
USD ($)
Sep. 30, 2011
CAD
Sep. 30, 2010
USD ($)
Sep. 30, 2010
CAD
SHAREHOLDERS' EQUITY          
Amount transferred to an employee benefit trust to fund restricted share unit plan  $ 3,700,000  $ 4,000,000    
Number of times per year the employee benefit trust is funded (in times per year)  1  1    
Common shares outstanding at September 30, 2011 (in shares)169,377,973169,377,973    169,377,973169,377,973  
Employees' stock options (in shares)8,960,5518,960,551    8,960,5518,960,551  
Warrants (in shares)8,600,0008,600,000    8,600,0008,600,000  
Restricted share unit plan (in shares)50,39150,391    50,39150,391  
Maximum number of common shares (in shares)186,988,915186,988,915    186,988,915186,988,915  
Stock options granted (in shares)27,00027,000 116,000116,000 2,620,7852,620,7852,911,0802,911,080
Stock options granted - Weighted average exercise price (in Canadian dollars per share)  55.25   66.26   76.24  57.42
Stock options, weighted average exercised (in shares)89,30089,300 387,725387,725 306,688306,688673,098673,098
Cash received from exercise of stock options (in U.S. dollars)4,600,000  17,100,000  13,500,000 26,600,000 
Stock options cancelled (in shares)24,50024,500 143,750143,750 116,250116,250196,800196,800
Stock options cancelled - weighted-average exercise price (in Canadian dollars per share)  69.37   58.63   67.40  57.84
Changes in Common Shares outstanding          
Common shares outstanding, beginning of period (in shares)  168,720,355   168,720,355168,720,355  
Common shares, beginning of period, (in U.S. dollars)  3,078,217,000   3,078,217,000   
Shares issued under Employee Stock Option Plan, (in U.S. dollars)      16,972,000   
Shares issued under Employee Stock Option Plan (in shares)      306,688306,688  
Shares issued under Incentive Share Purchase Plan, (in U.S. dollars)      14,238,000   
Shares issued under Incentive Share Purchase Plan (in shares)      223,191223,191  
Shares issued under Dividend Reinvestment Plan, (in U.S. dollars)      8,494,000   
Shares issued under Dividend Reinvestment Plan (in shares)      134,990134,990  
Restricted share unit plan, amount (in U.S. dollars)      (854,000)   
Restricted share unit plan (in shares)      (7,251)(7,251)  
Common shares, end of period, (in U.S. dollars)3,117,067,000     3,117,067,000   
Common shares outstanding, end of period (in shares)169,377,973169,377,973    169,377,973169,377,973  
Net income per share          
Net income (loss)$ (81,614,000)  $ 121,461,000  $ 32,475,000 $ 244,153,000 
Weighted average number of common shares outstanding - basic (in shares)169,238,000169,238,000 167,461,000167,461,000 169,055,000169,055,000160,353,000160,353,000
Add : Dilutive impact of employee stock options (in shares)   1,131,0001,131,000 1,094,0001,094,0001,131,0001,131,000
Dilutive impact of warrants (in shares)   2,040,0002,040,000 2,447,0002,447,0001,811,0001,811,000
Dilutive impact of treasury shares related to restricted share unit plan (in shares)   47,00047,000 50,00050,00047,00047,000
Weighted average number of common shares outstanding - diluted (in shares)169,238,000169,238,000 170,679,000170,679,000 172,646,000172,646,000163,342,000163,342,000
Net income (loss) per share - basic (in dollars per share)$ (0.48)  $ 0.73  $ 0.19 $ 1.52 
Net income (loss) per share - diluted (in dollars per share)$ (0.48)  $ 0.71  $ 0.19 $ 1.49 
Employee stock options excluded from the computation of diluted weighted average common shares (in shares)   1,033,5251,033,525 738,321738,3211,033,5251,033,525