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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Class A Common Stock | Class B Convertible Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 200,311 | $ 15 | $ 2 | $ 468,087 | $ (475,184) | $ (1,515) | $ 208,906
Beginning Balance (in shares) at Dec. 31, 2012 |  | 15,462 | 2,227 |  | (6,405) |  |
Net income (loss) | 83,332 | $ 0 | $ 0 | 0 | $ 0 | 0 | 83,332
Other comprehensive income | 684 | 0 | 0 | 0 | 0 | 684 | 0
Translation gain released to other income | 0 |  |  |  |  |  |
Issuance of class A common stock under stock option plans | $ 341 | $ 0 | $ 0 | 341 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) | 16 | 16 | 0 |  | 0 |  |
Tax effect of stock option exercises | $ 23,580 | $ 0 | $ 0 | 23,580 | $ 0 | 0 | 0
Share-based compensation expense | 2,078 | 0 | 0 | 2,078 | 0 | 0 | 0
Ending Balance at Dec. 31, 2013 | 310,326 | $ 15 | $ 2 | 494,086 | $ (475,184) | (831) | 292,238
Ending Balance (in shares) at Dec. 31, 2013 |  | 15,478 | 2,227 |  | (6,405) |  |
Net income (loss) | 5,035 | $ 0 | $ 0 | 0 | $ 0 | 0 | 5,035
Other comprehensive income | (3,532) | 0 | 0 | 0 | 0 | (3,532) | 0
Translation gain released to other income | 0 |  |  |  |  |  |
Conversion of class B to class A common stock | 0 | $ 0 | $ 0 | 0 | $ 0 | 0 | 0
Conversion of class B to class A common stock (in shares) |  | 172 | (172) |  | 0 |  |
Issuance of class A common stock under stock option plans | $ 856 | $ 1 | $ 0 | 855 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) | 9 | 10 | 0 |  | 0 |  |
Share-based compensation expense | $ 11,786 | $ 0 | $ 0 | 11,786 | $ 0 | 0 | 0
Ending Balance at Dec. 31, 2014 | 324,471 | $ 16 | $ 2 | 506,727 | $ (475,184) | (4,363) | 297,273
Ending Balance (in shares) at Dec. 31, 2014 |  | 15,660 | 2,055 |  | (6,405) |  |
Net income (loss) | 105,931 | $ 0 | $ 0 | 0 | $ 0 | 0 | 105,931
Other comprehensive income | (2,765) | 0 | 0 | 0 | 0 | (2,765) | 0
Translation gain released to other income | (280) | 0 | 0 | 0 | 0 | (280) | 0
Conversion of class B to class A common stock | 0 | $ 0 | $ 0 | 0 | $ 0 | 0 | 0
Conversion of class B to class A common stock (in shares) |  | 20 | (20) |  | 0 |  |
Issuance of class A common stock under stock option plans | $ 9,529 | $ 0 | $ 0 | 9,529 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) | 91 | 91 | 0 |  | 0 |  |
Tax effect of stock option exercises | $ 1,096 | $ 0 | $ 0 | 1,096 | $ 0 | 0 | 0
Share-based compensation expense | 17,299 | 0 | 0 | 17,299 | 0 | 0 | 0
Ending Balance at Dec. 31, 2015 | $ 455,281 | $ 16 | $ 2 | $ 534,651 | $ (475,184) | $ (7,408) | $ 403,204
Ending Balance (in shares) at Dec. 31, 2015 |  | 15,771 | 2,035 |  | (6,405) |  |

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