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Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 |  | 173,507 |  |  |
Beginning Balance at Dec. 31, 2017 | $ 1,095,673 | $ 347 | $ 461,338 | $ 668,587 | $ (34,599)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under stock plans (in shares) |  | 881 |  |  |
Issuance of common stock under stock plans | 14,811 | $ 2 | 14,809 |  |
Repurchase of common stock (in shares) |  | (2,356) |  |  |
Repurchase of common stock | (121,308) | $ (5) |  | (121,303) |
Stock-based compensation expense | 22,196 |  | 22,196 |  |
Payment of dividends | (15,524) |  |  | (15,524) |
Net income | 93,413 |  |  | 93,413 |
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($106) | (702) |  |  |  | (702)
Reclassification of net realized (gain) loss on the sale of available-for-sale investments | (269) |  |  |  | (269)
Foreign currency translation adjustment | (3,197) |  |  |  | (3,197)
Ending Balance (in shares) at Jul. 01, 2018 |  | 172,032 |  |  |
Ending Balance at Jul. 01, 2018 | 1,079,132 | $ 344 | 498,343 | 619,212 | (38,767)
Beginning Balance (in shares) at Apr. 01, 2018 |  | 172,948 |  |  |
Beginning Balance at Apr. 01, 2018 | 1,077,099 | $ 346 | 485,654 | 622,856 | (31,757)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under stock plans (in shares) |  | 184 |  |  |
Issuance of common stock under stock plans | 3,688 | $ 1 | 3,687 |  |
Repurchase of common stock (in shares) |  | (1,100) |  |  |
Repurchase of common stock | (52,106) | $ (3) |  | (52,103) |
Stock-based compensation expense | 9,002 |  | 9,002 |  |
Payment of dividends | (7,737) |  |  | (7,737) |
Net income | 56,196 |  |  | 56,196 |
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($106) | 490 |  |  |  | 490
Reclassification of net realized (gain) loss on the sale of available-for-sale investments | (247) |  |  |  | (247)
Foreign currency translation adjustment | (7,253) |  |  |  | (7,253)
Ending Balance (in shares) at Jul. 01, 2018 |  | 172,032 |  |  |
Ending Balance at Jul. 01, 2018 | $ 1,079,132 | $ 344 | 498,343 | 619,212 | (38,767)
Beginning Balance (in shares) at Dec. 31, 2018 | 170,820 | 170,820 |  |  |
Beginning Balance at Dec. 31, 2018 | $ 1,135,263 | $ 342 | 529,208 | 646,214 | (40,501)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under stock plans (in shares) |  | 1,239 |  |  |
Issuance of common stock under stock plans | 26,417 | $ 2 | 26,415 |  |
Repurchase of common stock (in shares) |  | (1,398) |  |  |
Repurchase of common stock | (61,690) | $ (3) |  | (61,687) |
Stock-based compensation expense | 23,248 |  | 23,248 |  |
Payment of dividends | (17,146) |  |  | (17,146) |
Net income | 81,853 |  |  | 81,853 |
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($106) | 4,562 |  |  |  | 4,562
Reclassification of net realized (gain) loss on the sale of available-for-sale investments | (422) |  |  |  | (422)
Foreign currency translation adjustment | $ (445) |  |  |  | (445)
Ending Balance (in shares) at Jun. 30, 2019 | 170,661 | 170,661 |  |  |
Ending Balance at Jun. 30, 2019 | $ 1,191,640 | $ 341 | 578,871 | 649,234 | (36,806)
Beginning Balance (in shares) at Mar. 31, 2019 |  | 171,537 |  |  |
Beginning Balance at Mar. 31, 2019 | 1,188,859 | $ 343 | 555,834 | 670,754 | (38,072)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under stock plans (in shares) |  | 522 |  |  |
Issuance of common stock under stock plans | 12,071 | $ 1 | 12,070 |  |
Repurchase of common stock (in shares) |  | (1,398) |  |  |
Repurchase of common stock | (61,690) | $ (3) |  | (61,687) |
Stock-based compensation expense | 10,967 |  | 10,967 |  |
Payment of dividends | (8,582) |  |  | (8,582) |
Net income | 48,749 |  |  | 48,749 |
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($106) | 2,311 |  |  |  | 2,311
Reclassification of net realized (gain) loss on the sale of available-for-sale investments | (382) |  |  |  | (382)
Foreign currency translation adjustment | $ (663) |  |  |  | (663)
Ending Balance (in shares) at Jun. 30, 2019 | 170,661 | 170,661 |  |  |
Ending Balance at Jun. 30, 2019 | $ 1,191,640 | $ 341 | $ 578,871 | $ 649,234 | $ (36,806)

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