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SHAREHOLDERS' EQUITY (TABLES)
 12 Months Ended
Dec. 31, 2011
SHAREHOLDERS' EQUITY [Abstract]  
COMMON SHARES ISSUED AND OUTSTANDING [Table Text Block]
The following table presents our common shares issued and outstanding, excluding restricted shares under our stock compensation plans (see Note 15 - Stock Compensation Plans):
         
          
      
 Year ended December 31, 2011 2010 2009 
          
 Shares issued, balance at beginning of period  154,912  152,465  150,455 
 Shares issued  15,247  2,447  2,010 
 Total shares issued at end of period  170,159  154,912  152,465 
          
 Treasury shares, balance at beginning of period  (42,519)  (20,325)  (14,243) 
 Shares repurchased   (2,052)  (22,194)  (6,082) 
 Total treasury shares at end of period  (44,571)  (42,519)  (20,325) 
          
 Total shares outstanding  125,588  112,393  132,140 
          
SHARE REPURCHASES HELD IN TREASURY [Table Text Block]
The following table presents our common share repurchase activities, which are held in treasury:
           
     
 Year ended December 31, 2011  2010  2009 
 In the open market:         
 Total shares  1,609   18,750   5,851 
 Total cost$ 49,974 $ 590,694 $ 169,620 
 Average price per share(2)$ 31.07 $ 31.50 $ 28.99 
           
 From employees:(1)         
 Total shares  443   381   231 
 Total cost$ 15,911 $ 11,062 $ 6,289 
 Average price per share(2)$ 35.92 $ 29.04 $ 27.23 
           
 From founding shareholder:(3)         
 Total shares  -   3,063   - 
 Total cost$ -   107,827   - 
 Average price per share(2)$ -   35.21   - 
           
 Total         
 Total shares  2,052   22,194   6,082 
 Total cost$ 65,885 $ 709,583 $ 175,909 
 Average price per share(2)$ 32.11 $ 31.97 $ 28.92 
           
(1) To satisfy withholding tax liabilities upon vesting of restricted stock, restricted stock units, and exercise of stock options. Share repurchases from employees are excluded from the authorized share repurchase plans noted above.
(2) Calculated using whole figures.
(3) During the fourth quarter of 2010, we privately negotiated with Trident II, L.P. and affiliated entities to repurchase 3,062,824 of our common shares.