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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

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