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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Class A | Class B Convertible | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 324,471 | $ 16 | $ 2 | $ 506,727 | $ (475,184) | $ (4,363) | $ 297,273
Beginning Balance (in shares) at Dec. 31, 2014 |  | 15,660 | 2,055 |  | (6,405) |  |
Net income | 105,931 | $ 0 | $ 0 | 0 | $ 0 | 0 | 105,931
Other comprehensive gain (loss) | (2,765) | 0 | 0 | 0 | 0 | (2,765) | 0
Translation gain reclassified 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) |  |
Net income | 90,908 | $ 0 | $ 0 | 0 | $ 0 | 0 | 90,908
Other comprehensive gain (loss) | (3,335) | 0 | 0 | 0 | 0 | (3,335) | 0
Translation gain reclassified to other income | 0 |  |  |  |  |  |
Issuance of class A common stock under stock option plans | $ 1,663 | $ 0 | $ 0 | 1,663 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) | 112 | 34 | 0 |  | 0 |  |
Tax effect of stock option exercises | $ 1,244 | $ 0 | $ 0 | 1,244 | $ 0 | 0 | 0
Share-based compensation expense | 11,817 | 0 | 0 | 11,817 | 0 | 0 | 0
Payment of taxes relating to net exercise of employee stock options | (3,739) | 0 | 0 | (3,739) | 0 | 0 | 0
Write-off of deferred tax assets relating to vested employee stock options that are no longer exercisable | (1,662) | 0 | 0 | (1,662) | 0 | 0 | 0
Ending Balance at Dec. 31, 2016 | 552,177 | $ 16 | $ 2 | 543,974 | $ (475,184) | (10,743) | 494,112
Ending Balance (in shares) at Dec. 31, 2016 |  | 15,805 | 2,035 |  | (6,405) |  |
Net income | 17,643 | $ 0 | $ 0 | 0 | $ 0 | 0 | 17,643
Other comprehensive gain (loss) | 4,775 | 0 | 0 | 0 | 0 | 4,775 | 0
Translation gain reclassified to other income | 0 |  |  |  |  |  |
Issuance of class A common stock under stock option plans | $ 1,677 | $ 0 | $ 0 | 1,677 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) | 12 | 12 | 0 |  | 0 |  |
Share-based compensation expense | $ 14,267 | $ 0 | $ 0 | 14,267 | $ 0 | 0 | 0
Ending Balance at Dec. 31, 2017 | $ 590,539 | $ 16 | $ 2 | $ 559,918 | $ (475,184) | $ (5,968) | $ 511,755
Ending Balance (in shares) at Dec. 31, 2017 |  | 15,817 | 2,035 |  | (6,405) |  |

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