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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Cumulative Effect, Period of Adoption, Adjusted Balance
Common shares
Common shares
Cumulative Effect, Period of Adoption, Adjusted Balance
Additional Paid- in Capital
Additional Paid- in Capital
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance, value (in shares) at Dec. 31, 2018       189,346,101                
Beginning balance, value at Dec. 31, 2018 $ 1,404,182     $ 1,888   $ 1,471,301   $ 438,453     $ (507,460)  
Issuance of common shares on exercise of options (Note 18) (in shares) 697,531     697,531                
Issuance of common shares on exercise of options (Note 18) $ 10,690     $ 7   10,683            
Issuance of common shares under the employee stock purchase plan (Note 18) (in shares)       264,440                
Issuance of common shares under the employee stock purchase plan (Note 18) 8,980     $ 3   8,977            
Net settlement on vesting of restricted share units (Note 18) (in shares)       574,112                
Net settlement on vesting of restricted share units (Note 18) $ (4,265)     $ 6   (4,271)            
Net settlement on vesting of performance units (Note 18) (in shares)       2,151                
Stock repurchased and retired (Note 19( (in shares) (766,154)     (766,154)                
Stock repurchased and retired (Note 19) $ (30,000)     $ (8)   0   (29,992)        
Expenses related to stock repurchase (Note 19) (15)             (15)        
Stock-based compensation expense (Note 18) 83,885         83,885            
Comprehensive income (loss):                        
Net income (loss) 304,881             304,881        
Other comprehensive income (loss) (24,496)                   (24,496)  
Dividend (64,671)             (64,671)        
End balance, value (in shares) at Dec. 31, 2019       190,118,181 190,118,181              
End balance, value at Dec. 31, 2019 $ 1,689,171 $ (3,984) $ 1,685,187 $ 1,896 $ 1,896 1,570,575 $ 1,570,575 648,656 $ (3,984) $ 644,672 (531,956) $ (531,956)
Issuance of common shares on exercise of options (Note 18) (in shares) 692,634     692,634                
Issuance of common shares on exercise of options (Note 18) $ 14,062     $ 7   14,055            
Issuance of common shares under the employee stock purchase plan (Note 18) (in shares)       315,245                
Issuance of common shares under the employee stock purchase plan (Note 18) 11,073     $ 3   11,070            
Net settlement on vesting of restricted share units (Note 18) (in shares)       429,362                
Net settlement on vesting of restricted share units (Note 18) (7,842)     $ 4   (7,846)            
Net settlement on vesting of performance units (Note 18) (in shares)       902,532                
Net settlement on vesting of performance units (Note 18) $ (25,827)     $ 9   (25,836)            
Stock repurchased and retired (Note 19( (in shares) (3,412,293)     (3,412,293)                
Stock repurchased and retired (Note 19) $ (137,044)     $ (34)   0   (137,010)        
Expenses related to stock repurchase (Note 19) (68)             (68)        
Stock-based compensation expense (Note 18) 74,008         74,008            
Comprehensive income (loss):                        
Net income (loss) 308,276             308,276        
Other comprehensive income (loss) (13,384)                   (13,384)  
Dividend $ (74,212)             (74,212)        
End balance, value (in shares) at Dec. 31, 2020 189,045,661     189,045,661                
End balance, value at Dec. 31, 2020 $ 1,834,229     $ 1,885   1,636,026   741,658     (545,340)  
Issuance of common shares on exercise of options (Note 18) (in shares) 1,145,125     1,145,125                
Issuance of common shares on exercise of options (Note 18) $ 23,168     $ 11   23,157            
Issuance of common shares under the employee stock purchase plan (Note 18) (in shares)       285,657                
Issuance of common shares under the employee stock purchase plan (Note 18) 11,883     $ 3   11,880            
Net settlement on vesting of restricted share units (Note 18) (in shares)       335,036                
Net settlement on vesting of restricted share units (Note 18) (7,556)     $ 3   (7,559)            
Net settlement on vesting of performance units (Note 18) (in shares)       1,102,440                
Net settlement on vesting of performance units (Note 18) $ (28,290)     $ 11   (28,301)            
Stock repurchased and retired (Note 19( (in shares) (6,577,562)     (6,577,562)                
Stock repurchased and retired (Note 19) $ (298,087)     $ (66)       (298,021)        
Expenses related to stock repurchase (Note 19) (132)             (132)        
Stock-based compensation expense (Note 18) 81,968         81,968            
Stockholders' Equity, Other (6)         (6)            
Comprehensive income (loss):                        
Net income (loss) 369,448             369,448        
Other comprehensive income (loss) (9,013)                   (9,013)  
Dividend $ (80,479)             (80,479)        
End balance, value (in shares) at Dec. 31, 2021 185,336,357     185,336,357                
End balance, value at Dec. 31, 2021 $ 1,897,133     $ 1,847   $ 1,717,165   $ 732,474     $ (554,353)