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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Adjusted balance as of January 1
Transition period adjustment on accounts receivables (through retained earnings) pursuant to adoption of ASC 326
Common shares
Common shares
Adjusted balance as of January 1
Additional  Paid-in Capital
Additional  Paid-in Capital
Adjusted balance as of January 1
Retained Earnings
Retained Earnings
Adjusted balance as of January 1
Retained Earnings
Transition period adjustment on accounts receivables (through retained earnings) pursuant to adoption of ASC 326
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Adjusted balance as of January 1
Beginning balance, value (in shares) at Dec. 31, 2019       190,118,181 190,118,181              
Beginning balance, value at Dec. 31, 2019 $ 1,689,171 $ 1,685,187 $ (3,984) $ 1,896 $ 1,896 $ 1,570,575 $ 1,570,575 $ 648,656 $ 644,672 $ (3,984) $ (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                
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)   0   (298,021)        
Expenses related to stock repurchase (Note 19) (132)             (132)        
Stock-based compensation expense (Note 18) 81,968         81,968            
Others (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)  
Issuance of common shares on exercise of options (Note 18) (in shares) 665,036     665,036                
Issuance of common shares on exercise of options (Note 18) $ 14,701     $ 7   14,694            
Issuance of common shares under the employee stock purchase plan (Note 18) (in shares)       324,783                
Issuance of common shares under the employee stock purchase plan (Note 18) 13,050     $ 3   13,047            
Net settlement on vesting of restricted share units (Note 18) (in shares)       74,934                
Net settlement on vesting of restricted share units (Note 18) (421)     $ 1   (422)            
Net settlement on vesting of performance units (Note 18) (in shares)       1,300,511                
Net settlement on vesting of performance units (Note 18) $ (44,391)     $ 13   (44,404)            
Stock repurchased and retired (Note 19( (in shares) (4,777,205)     (4,777,205)                
Stock repurchased and retired (Note 19) $ (213,986)     $ (48)       (213,938)        
Expenses related to stock repurchase (Note 19) (96)             (96)        
Stock-based compensation expense (Note 18) 77,373         77,373            
Comprehensive income (loss):                        
Net income (loss) 353,404             353,404        
Other comprehensive income (loss) (178,772)                   (178,772)  
Dividend $ (91,837)             (91,837)        
End balance, value (in shares) at Dec. 31, 2022 182,924,416     182,924,416                
End balance, value at Dec. 31, 2022 $ 1,826,158     $ 1,823   $ 1,777,453   $ 780,007     $ (733,125)