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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, 2017 | $ 605,726 | $ 16 | $ 2 | $ 559,918 | $ (475,184) | $ (5,659) | $ 526,633
Beginning Balance (in shares) at Dec. 31, 2017 |  | 15,817 | 2,035 |  | (6,405) |  |
Net income (loss) | 1,673 | $ 0 | $ 0 | 0 | $ 0 | 0 | 1,673
Other comprehensive income (loss) | 1,440 | 0 | 0 | 0 | 0 | 1,440 | 0
Share-based compensation expense | 4,743 | 0 | 0 | 4,743 | 0 | 0 | 0
Ending Balance at Mar. 31, 2018 | 613,582 | $ 16 | $ 2 | 564,661 | $ (475,184) | (4,219) | 528,306
Ending Balance (in shares) at Mar. 31, 2018 |  | 15,817 | 2,035 |  | (6,405) |  |
Beginning Balance at Dec. 31, 2017 | 605,726 | $ 16 | $ 2 | 559,918 | $ (475,184) | (5,659) | 526,633
Beginning Balance (in shares) at Dec. 31, 2017 |  | 15,817 | 2,035 |  | (6,405) |  |
Net income (loss) | 19,200 |  |  |  |  |  |
Other comprehensive income (loss) | (3,059) |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 635,423 | $ 16 | $ 2 | 573,474 | $ (475,184) | (8,718) | 545,833
Ending Balance (in shares) at Sep. 30, 2018 |  | 15,837 | 2,035 |  | (6,405) |  |
Beginning Balance at Mar. 31, 2018 | 613,582 | $ 16 | $ 2 | 564,661 | $ (475,184) | (4,219) | 528,306
Beginning Balance (in shares) at Mar. 31, 2018 |  | 15,817 | 2,035 |  | (6,405) |  |
Net income (loss) | 4,828 | $ 0 | $ 0 | 0 | $ 0 | 0 | 4,828
Other comprehensive income (loss) | (3,892) | 0 | 0 | 0 | 0 | (3,892) | 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 |  |
Share-based compensation expense | 3,370 | $ 0 | $ 0 | 3,370 | $ 0 | 0 | 0
Ending Balance at Jun. 30, 2018 | 620,359 | $ 16 | $ 2 | 570,502 | $ (475,184) | (8,111) | 533,134
Ending Balance (in shares) at Jun. 30, 2018 |  | 15,837 | 2,035 |  | (6,405) |  |
Net income (loss) | 12,699 | $ 0 | $ 0 | 0 | $ 0 | 0 | 12,699
Other comprehensive income (loss) | (607) | 0 | 0 | 0 | 0 | (607) | 0
Share-based compensation expense | 2,972 | 0 | 0 | 2,972 | 0 | 0 | 0
Ending Balance at Sep. 30, 2018 | 635,423 | $ 16 | $ 2 | 573,474 | $ (475,184) | (8,718) | 545,833
Ending Balance (in shares) at Sep. 30, 2018 |  | 15,837 | 2,035 |  | (6,405) |  |
Net income (loss) | 3,301 | $ 0 | $ 0 | 0 | $ 0 | 0 | 3,301
Other comprehensive income (loss) | (1,499) | 0 | 0 | 0 | 0 | (1,499) | 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 | 3,483 | $ 0 | $ 0 | 3,483 | $ 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 (loss) | (7,906) | $ 0 | $ 0 | 0 | $ 0 | 0 | (7,906)
Other comprehensive income (loss) | 253 | 0 | 0 | 0 | 0 | 253 | 0
Issuance of class A common stock under stock option plans | 1,507 | $ 0 | $ 0 | 1,507 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) |  | 13 | 0 |  | 0 |  |
Purchases of treasury stock | (48,244) | $ 0 | $ 0 | 0 | $ (48,244) | 0 | 0
Purchases of treasury stock (in shares) |  | 0 | 0 |  | (363) |  |
Share-based compensation expense | 2,965 | $ 0 | $ 0 | 2,965 | $ 0 | 0 | 0
Ending Balance at Mar. 31, 2019 | 478,306 | $ 16 | $ 2 | 581,429 | $ (634,405) | (9,964) | 541,228
Ending Balance (in shares) at Mar. 31, 2019 |  | 15,850 | 2,035 |  | (7,648) |  |
Beginning Balance at Dec. 31, 2018 | 529,731 | $ 16 | $ 2 | 576,957 | $ (586,161) | (10,217) | 549,134
Beginning Balance (in shares) at Dec. 31, 2018 |  | 15,837 | 2,035 |  | (7,285) |  |
Net income (loss) | 22,188 |  |  |  |  |  |
Other comprehensive income (loss) | (1,457) |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 515,419 | $ 16 | $ 2 | 590,158 | $ (634,405) | (11,674) | 571,322
Ending Balance (in shares) at Sep. 30, 2019 |  | 15,880 | 2,035 |  | (7,648) |  |
Beginning Balance at Mar. 31, 2019 | 478,306 | $ 16 | $ 2 | 581,429 | $ (634,405) | (9,964) | 541,228
Beginning Balance (in shares) at Mar. 31, 2019 |  | 15,850 | 2,035 |  | (7,648) |  |
Net income (loss) | 20,394 | $ 0 | $ 0 | 0 | $ 0 | 0 | 20,394
Other comprehensive income (loss) | 654 | 0 | 0 | 0 | 0 | 654 | 0
Issuance of class A common stock under stock option plans | 329 | $ 0 | $ 0 | 329 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) |  | 3 | 0 |  | 0 |  |
Share-based compensation expense | 3,006 | $ 0 | $ 0 | 3,006 | $ 0 | 0 | 0
Ending Balance at Jun. 30, 2019 | 502,689 | $ 16 | $ 2 | 584,764 | $ (634,405) | (9,310) | 561,622
Ending Balance (in shares) at Jun. 30, 2019 |  | 15,853 | 2,035 |  | (7,648) |  |
Net income (loss) | 9,700 | $ 0 | $ 0 | 0 | $ 0 | 0 | 9,700
Other comprehensive income (loss) | (2,364) | 0 | 0 | 0 | 0 | (2,364) | 0
Issuance of class A common stock under stock option plans | 3,606 | $ 0 | $ 0 | 3,606 | $ 0 | 0 | 0
Issuance of class A common stock under stock option plans (in shares) |  | 27 | 0 |  | 0 |  |
Share-based compensation expense | 1,788 | $ 0 | $ 0 | 1,788 | $ 0 | 0 | 0
Ending Balance at Sep. 30, 2019 | $ 515,419 | $ 16 | $ 2 | $ 590,158 | $ (634,405) | $ (11,674) | $ 571,322
Ending Balance (in shares) at Sep. 30, 2019 |  | 15,880 | 2,035 |  | (7,648) |  |

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