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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, 2016 | $ 566,317 | $ 16 | $ 2 | $ 543,974 | $ (475,184) | $ (10,929) | $ 508,438
Beginning Balance (in shares) at Dec. 31, 2016 |  | 15,805 | 2,035 |  | (6,405) |  |
Net income | 18,195 | $ 0 | $ 0 | 0 | $ 0 | 0 | 18,195
Other comprehensive income (loss) | 5,270 | 0 | 0 | 0 | 0 | 5,270 | 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 | 0 |  | 0 |  |
Share-based compensation expense | 14,267 | $ 0 | $ 0 | 14,267 | $ 0 | 0 | 0
Ending Balance at Dec. 31, 2017 | 605,726 | $ 16 | $ 2 | 559,918 | $ (475,184) | (5,659) | 526,633
Ending Balance (in shares) at Dec. 31, 2017 |  | 15,817 | 2,035 |  | (6,405) |  |
Net income | 22,501 | $ 0 | $ 0 | 0 | $ 0 | 0 | 22,501
Other comprehensive income (loss) | (4,558) | 0 | 0 | 0 | 0 | (4,558) | 0
Issuance of class A common stock under stock option plans | 2,471 | $ 0 | $ 0 | 2,471 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) |  | 20 | 0 |  | 0 |  |
Purchases of treasury stock | (110,977) | $ 0 | $ 0 | 0 | $ (110,977) | 0 | 0
Purchases of treasury stock (in shares) |  | 0 | 0 |  | (880) |  |
Share-based compensation expense | 14,568 | $ 0 | $ 0 | 14,568 | $ 0 | 0 | 0
Ending Balance at Dec. 31, 2018 | 529,731 | $ 16 | $ 2 | 576,957 | $ (586,161) | (10,217) | 549,134
Ending Balance (in shares) at Dec. 31, 2018 |  | 15,837 | 2,035 |  | (7,285) |  |
Net income | 34,355 | $ 0 | $ 0 | 0 | $ 0 | 0 | 34,355
Other comprehensive income (loss) | 566 | 0 | 0 | 0 | 0 | 566 | 0
Issuance of class A common stock under stock option plans | 6,569 | $ 0 | $ 0 | 6,569 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) |  | 51 | 0 |  | 0 |  |
Purchases of treasury stock | (72,719) | $ 0 | $ 0 | 0 | $ (72,719) | 0 | 0
Purchases of treasury stock (in shares) |  | 0 | 0 |  | (522) |  |
Share-based compensation expense | 10,057 | $ 0 | $ 0 | 10,057 | $ 0 | 0 | 0
Ending Balance at Dec. 31, 2019 | $ 508,559 | $ 16 | $ 2 | $ 593,583 | $ (658,880) | $ (9,651) | $ 583,489
Ending Balance (in shares) at Dec. 31, 2019 |  | 15,888 | 2,035 |  | (7,807) |  |

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