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Consolidated Statements of Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common shares
Additional Paid- in Capital
Retained Earnings
Accumulated Other Comprehensive Income (loss)
Non controlling interest
Beginning balance, value at Dec. 31, 2011 $ 1,435,683 $ 2,222 $ 1,146,203 $ 605,386 $ (320,753) $ 2,625
Beginning balance, value (in shares) at Dec. 31, 2011   222,347,968        
Issuance of common shares on exercise of options (Note 11) (in shares)   1,461,981        
Issuance of common shares on exercise of options (Note 11) 18,746 15 18,731      
Issuance of common shares under the employee stock purchase plan (Note 11) (in shares)   63,106        
Issuance of common shares under the employee stock purchase plan (Note 11) 938 1 937      
Net settlement on vesting of restricted share units (Note 11) (in shares)   243,696        
Net settlement on vesting of restricted share units (Note 11) (1,746) 2 (1,748)      
Distribution to noncontrolling interest (3,961)         (3,961)
Stock-based compensation expense (Note 11) 22,856   22,856      
Comprehensive income:            
Net income 129,666     124,815   4,851
Other comprehensive income (loss) 53,036       53,292 (256)
Dividend (Note 21) (501,620)     (501,620)    
End balance, value at Sep. 30, 2012 1,153,598 2,240 1,186,979 228,581 (267,461) 3,259
End balance, value (in shares) at Sep. 30, 2012   224,116,751        
Beginning balance, value at Jun. 30, 2012            
Comprehensive income:            
Net income 26,611         1,436
Other comprehensive income (loss)           (157)
End balance, value at Sep. 30, 2012 1,153,598         3,259
Beginning balance, value at Dec. 31, 2012 1,171,781 2,253 1,202,448 281,982 (318,272) 3,370
Beginning balance, value (in shares) at Dec. 31, 2012 225,480,172 225,480,172        
Issuance of common shares on exercise of options (Note 11) (in shares) 3,784,851 3,784,851        
Issuance of common shares on exercise of options (Note 11) 34,017 38 33,979      
Issuance of common shares under the employee stock purchase plan (Note 11) (in shares)   81,040        
Issuance of common shares under the employee stock purchase plan (Note 11) 1,372 1 1,371      
Net settlement on vesting of restricted share units (Note 11) (in shares)   305,382        
Net settlement on vesting of restricted share units (Note 11) (2,535) 3 (2,538)      
Net settlement on vesting of performance units (Note 11) (in shares)   496,112        
Net settlement on vesting of performance units (Note 11) (5,064) 5 (5,069)      
Disposition of noncontrolling interest (1,055)         (1,055)
Distribution to noncontrolling interest (4,614)         (4,614)
Stock-based compensation expense (Note 11) 21,931   21,931      
Comprehensive income:            
Net income 185,145     180,875   4,270
Other comprehensive income (loss) (199,454)       (199,519) 65
End balance, value at Sep. 30, 2013 1,201,524 2,300 1,252,122 462,857 (517,791) 2,036
End balance, value (in shares) at Sep. 30, 2013 230,147,557 230,147,557        
Beginning balance, value at Jun. 30, 2013            
Comprehensive income:            
Net income 71,431         1,169
Other comprehensive income (loss)           31
End balance, value at Sep. 30, 2013 $ 1,201,524         $ 2,036
End balance, value (in shares) at Sep. 30, 2013 230,147,557