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SHAREHOLDERS' EQUITY (TABLES)
9 Months Ended
Sep. 30, 2011
SHAREHOLDERS' EQUITY [ABSTRACT] 
COMMON SHARES ISSUED AND OUTSTANDING
The following table presents our common shares issued and outstanding:
            
    Three months ended Nine months ended 
    September 30, September 30, 
  2011 2010 2011 2010 
            
 Shares issued, balance at beginning of period 168,737  154,549  154,912  152,465 
 Shares issued 362  148  14,187  2,232 
 Total shares issued at end of period 169,099  154,697  169,099  154,697 
            
 Treasury shares, balance at beginning of period (42,926)  (34,295)  (42,519)  (20,325) 
 Shares repurchased (32)  (444)  (439)  (14,414) 
 Total treasury shares at end of period (42,958)  (34,739)  (42,958)  (34,739) 
            
 Total shares outstanding 126,141  119,958  126,141  119,958