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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common shares
Additional Paid- in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance, value at Dec. 31, 2018 $ 1,404,182 $ 1,888 $ 1,471,301 $ 438,453 $ (507,460)
Beginning balance, value (in shares) at Dec. 31, 2018   189,346,101      
Issuance of common shares on exercise of options 2,659 $ 1 2,658    
Issuance of common shares on exercise of options (in shares)   135,535      
Issuance of common shares under the employee stock purchase plan 1,940 $ 1 1,939    
Issuance of common shares under the employee stock purchase plan (in shares)   64,869      
Net settlement on vesting of restricted share units (652) $ 1 (653)    
Net settlement on vesting of restricted share units (in shares)   113,204      
Stock-based compensation expense 18,461   18,461    
Comprehensive income (loss):          
Net income (loss) 60,841     60,841  
Other comprehensive income (loss) 23,857       23,857
Dividend (16,119)     (16,119)  
End balance, value at Mar. 31, 2019 $ 1,495,169 $ 1,891 1,493,706 483,175 (483,603)
End balance, value (in shares) at Mar. 31, 2019   189,659,709      
Comprehensive income (loss):          
Stock repurchased and retired, shares 0        
Beginning balance, value at Dec. 31, 2019 $ 1,689,171 $ 1,896 1,570,575 648,656 (531,956)
Beginning balance, value (in shares) at Dec. 31, 2019 190,118,181 190,118,181      
Issuance of common shares on exercise of options $ 1,249 $ 1 1,248    
Issuance of common shares on exercise of options (in shares) 87,528 87,528      
Issuance of common shares under the employee stock purchase plan $ 2,814 $ 1 2,813    
Issuance of common shares under the employee stock purchase plan (in shares)   81,289      
Net settlement on vesting of restricted share units (95) $ 1 (96)    
Net settlement on vesting of restricted share units (in shares)   54,167      
Stock-based compensation expense 17,487   17,487    
Comprehensive income (loss):          
Net income (loss) 85,698     85,698  
Other comprehensive income (loss) (129,870)       (129,870)
Dividend (18,543)     (18,543)  
End balance, value at Mar. 31, 2020 $ 1,573,079 $ 1,898 1,566,191 666,816 (661,826)
End balance, value (in shares) at Mar. 31, 2020 190,201,079 190,201,079      
Transition period adjustment pursuant to ASC 326, net of tax (ASC 326) at Dec. 31, 2019 $ (3,984)     (3,984)  
Adjusted balance, value at Dec. 31, 2019 1,685,187 $ 1,896 1,570,575 644,672 $ (531,956)
Comprehensive income (loss):          
Net settlement on vesting of performance units $ (25,827) $ 9 $ (25,836)    
Net settlement on vesting of performance units, shares 902,532 902,102      
Stock repurchased and retired $ (45,000) $ (10)   (44,990)  
Stock repurchased and retired, shares (1,042,188) (1,042,188)      
Expenses related to stock repurchase $ (21)     $ (21)