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Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common shares | Additional Paid- in Capital | Retained Earnings | Accumulated Other Comprehensive Income (loss) | Non controlling interest
--- | --- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2011 | $ 1,435,683 | $ 2,222 | $ 1,146,203 | $ 605,386 | $ (320,753) | $ 2,625
Beginning balance, value (in shares) at Dec. 31, 2011 |  | 222,347,968 |  |  |  |
Issuance of common shares on exercise of options (Note 11) (in shares) |  | 1,461,981 |  |  |  |
Issuance of common shares on exercise of options (Note 11) | 18,746 | 15 | 18,731 |  |  |
Issuance of common shares under the employee stock purchase plan (Note 11) (in shares) |  | 63,106 |  |  |  |
Issuance of common shares under the employee stock purchase plan (Note 11) | 938 | 1 | 937 |  |  |
Net settlement on vesting of restricted share units (Note 11) (in shares) |  | 243,696 |  |  |  |
Net settlement on vesting of restricted share units (Note 11) | (1,746) | 2 | (1,748) |  |  |
Distribution to noncontrolling interest | (3,961) |  |  |  |  | (3,961)
Stock-based compensation expense (Note 11) | 22,856 |  | 22,856 |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 129,666 |  |  | 124,815 |  | 4,851
Other comprehensive income (loss) | 53,036 |  |  |  | 53,292 | (256)
Dividend (Note 21) | (501,620) |  |  | (501,620) |  |
End balance, value at Sep. 30, 2012 | 1,153,598 | 2,240 | 1,186,979 | 228,581 | (267,461) | 3,259
End balance, value (in shares) at Sep. 30, 2012 |  | 224,116,751 |  |  |  |
Beginning balance, value at Jun. 30, 2012 |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 26,611 |  |  |  |  | 1,436
Other comprehensive income (loss) |  |  |  |  |  | (157)
End balance, value at Sep. 30, 2012 | 1,153,598 |  |  |  |  | 3,259
Beginning balance, value at Dec. 31, 2012 | 1,171,781 | 2,253 | 1,202,448 | 281,982 | (318,272) | 3,370
Beginning balance, value (in shares) at Dec. 31, 2012 | 225,480,172 | 225,480,172 |  |  |  |
Issuance of common shares on exercise of options (Note 11) (in shares) | 3,784,851 | 3,784,851 |  |  |  |
Issuance of common shares on exercise of options (Note 11) | 34,017 | 38 | 33,979 |  |  |
Issuance of common shares under the employee stock purchase plan (Note 11) (in shares) |  | 81,040 |  |  |  |
Issuance of common shares under the employee stock purchase plan (Note 11) | 1,372 | 1 | 1,371 |  |  |
Net settlement on vesting of restricted share units (Note 11) (in shares) |  | 305,382 |  |  |  |
Net settlement on vesting of restricted share units (Note 11) | (2,535) | 3 | (2,538) |  |  |
Net settlement on vesting of performance units (Note 11) (in shares) |  | 496,112 |  |  |  |
Net settlement on vesting of performance units (Note 11) | (5,064) | 5 | (5,069) |  |  |
Disposition of noncontrolling interest | (1,055) |  |  |  |  | (1,055)
Distribution to noncontrolling interest | (4,614) |  |  |  |  | (4,614)
Stock-based compensation expense (Note 11) | 21,931 |  | 21,931 |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 185,145 |  |  | 180,875 |  | 4,270
Other comprehensive income (loss) | (199,454) |  |  |  | (199,519) | 65
End balance, value at Sep. 30, 2013 | 1,201,524 | 2,300 | 1,252,122 | 462,857 | (517,791) | 2,036
End balance, value (in shares) at Sep. 30, 2013 | 230,147,557 | 230,147,557 |  |  |  |
Beginning balance, value at Jun. 30, 2013 |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 71,431 |  |  |  |  | 1,169
Other comprehensive income (loss) |  |  |  |  |  | 31
End balance, value at Sep. 30, 2013 | $ 1,201,524 |  |  |  |  | $ 2,036
End balance, value (in shares) at Sep. 30, 2013 | 230,147,557 |  |  |  |  |

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