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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)
Total Equity
Redeemable non-controlling interest
Beginning balance, value (in shares) at Dec. 31, 2014   218,684,205          
Beginning balance, value at Dec. 31, 2014   $ 2,184 $ 1,296,730 $ 398,706 $ (412,484) $ 1,285,136  
Issuance of common shares on exercise of options (Note 15) (in shares)   659,257          
Issuance of common shares on exercise of options (Note 15)   $ 7 5,834     5,841  
Issuance of common shares under the employee stock purchase plan (Note 15) (in shares)   34,162          
Issuance of common shares under the employee stock purchase plan (Note 15)     683     683  
Net settlement on vesting of restricted share units (Note 15)   $ 1 (79)     (78)  
Net settlement on vesting of restricted share units (Note 15), shares   65,244          
Net settlement on vesting of performance units (Note 15)   $ 8 (8)        
Net settlement on vesting of performance units (Note 15), shares   845,524          
Stock repurchased and retired (Note 16)   $ (6)   (13,292)   (13,298)  
Stock repurchased and retired (Note 16), shares (590,713) (590,713)          
Expenses related to stock purchase (Note 16)       (12)   (12)  
Stock-based compensation expense (Note 15)     4,660     4,660  
Comprehensive income:              
Net income $ 44,653     44,653   44,653  
Other comprehensive income         10,940 10,940  
End balance, value (in shares) at Mar. 31, 2015   219,697,679          
End balance, value at Mar. 31, 2015   $ 2,194 1,307,820 430,055 (401,544) 1,338,525  
Beginning balance, value (in shares) at Dec. 31, 2015 211,472,312 211,472,312          
Beginning balance, value at Dec. 31, 2015   $ 2,111 1,342,022 411,508 (451,285) 1,304,356  
Issuance of common shares on exercise of options (Note 15) (in shares) 248,316 248,316          
Issuance of common shares on exercise of options (Note 15)   $ 2 4,210     4,212  
Issuance of common shares under the employee stock purchase plan (Note 15) (in shares)   30,487          
Issuance of common shares under the employee stock purchase plan (Note 15)     725     725  
Net settlement on vesting of restricted share units (Note 15)   $ 1 (50)     (49)  
Net settlement on vesting of restricted share units (Note 15), shares   95,191          
Net settlement on vesting of performance units (Note 15), shares   0          
Stock repurchased and retired (Note 16)   $ (14)   (33,003)   (33,017)  
Stock repurchased and retired (Note 16), shares (1,356,199) (1,356,199)          
Excess tax benefit on stock-based Compensation     2,163     2,163  
Expenses related to stock purchase (Note 16)       (27)   (27)  
Stock-based compensation expense (Note 15)     5,336     5,336  
Acquisition of redeemable non-controlling interest             $ 3,910
Comprehensive income:              
Net income $ 58,276     58,565   58,565 (289)
Other comprehensive income         7,340 7,340  
End balance, value (in shares) at Mar. 31, 2016 210,490,107 210,490,107          
End balance, value at Mar. 31, 2016   $ 2,100 $ 1,354,406 $ 437,043 $ (443,945) $ 1,349,604 $ 3,621