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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | ---
Balance at Jan. 01, 2018 | $ 1,953,646 | $ 24,444 | $ 1,638,413 | $ 18,776 | $ 272,013
Balance, Shares at Jan. 01, 2018 |  | 195,548 |  |  |
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax | (7,979) | $ 150 | (8,129) |  |
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 1,199 |  |  |
Stock-based compensation expense | 8,472 |  | 8,472 |  |
Repurchase of common stock | $ (140,672) | $ (368) |  |  | (140,304)
Repurchase of common stock (in shares) | 2,900 | (2,939) |  |  |
Cash dividends ($0.09 per share) | $ (17,598) |  |  |  | (17,598)
Net income | 86,974 |  |  |  | 86,974
Foreign currency translation adjustment | 10,541 |  |  | 10,541 |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (2,687) |  |  | (2,687) |
Less: reclassification adjustment for gains included in net income, net of tax | 1,668 |  |  | 1,668 |
Reclassification of unrealized gains on equity securities, net of tax of $(902) | 0 |  |  | (3,125) | 3,125
Amortization of prior service benefit, net of tax | (61) |  |  | (61) |
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 | 0 |  |  | 769 | (769)
Balance at Apr. 01, 2018 | 1,904,983 | $ 24,226 | 1,638,756 | 25,881 | 216,120
Balance, Shares at Apr. 01, 2018 |  | 193,808 |  |  |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Cumulative effect of changes in accounting principle related to revenue recognition | 12,679 |  |  |  | 12,679
Balance at Dec. 31, 2018 | 1,522,354 | $ 21,940 | 1,671,645 | (13,040) | (158,191)
Balance, Shares at Dec. 31, 2018 |  | 175,522 |  |  |
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax | (49) | $ 161 | (210) |  |
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 1,287 |  |  |
Stock-based compensation expense | 8,562 |  | 8,562 |  |
Repurchase of common stock | $ (151,470) | $ (557) |  |  | (150,913)
Repurchase of common stock (in shares) | 4,500 | (4,456) |  |  |
Cash dividends ($0.09 per share) | $ (15,641) |  |  |  | (15,641)
Net income | 109,138 |  |  |  | 109,138
Foreign currency translation adjustment | (4,659) |  |  | (4,659) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 2,100 |  |  | 2,100 |
Less: reclassification adjustment for gains included in net income, net of tax | (70) |  |  | (70) |
Amortization of prior service benefit, net of tax | (37) |  |  | (37) |
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 | 107 |  |  | 107 |
Balance at Mar. 31, 2019 | $ 1,470,228 | $ 21,544 | $ 1,679,997 | $ (15,706) | $ (215,607)
Balance, Shares at Mar. 31, 2019 |  | 172,353 |  |  |

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