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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock [Member] | Additional Paid-in Capital [Member] | [1] | Retained Earnings [Member] | [1] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 |  | $ 1,095,673,000 | $ (5,961,000) | $ 347,000 | [1] | $ 461,338,000 | $ 668,587,000 | $ (5,961,000) | $ (34,599,000)
Beginning Balance, shares at Dec. 31, 2017 | [1] |  |  | 173,507 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option plans |  | 26,783,000 |  | $ 3,000 | [1] | 26,780,000 |  |  |
Issuance of common stock under stock option plans, shares | [1] |  |  | 1,493 |  |  |  |  |
Repurchase of common stock |  | (203,822,000) |  | $ (8,000) | [1] |  | (203,814,000) |  |
Repurchase of common stock, shares | [1] |  |  | (4,180) |  |  |  |  |
Stock-based compensation expense |  | 41,090,000 |  |  |  | 41,090,000 |  |  |
Payment of dividends |  | (31,865,000) |  |  |  |  | (31,865,000) |  |
Net income |  | 219,267,000 |  |  |  |  | 219,267,000 |  |
Net unrealized gain (loss), net of tax of $981, $515, and ($188) in 2020 2019, and 2018, respectively |  | (1,185,000) |  |  |  |  |  |  | (1,185,000)
Net unrealized gain (loss) on available-for-sale investments, net of tax |  | (1,185,000) |  |  |  |  |  |  |
Reclassification of net realized (gain) loss on the sale of available-for-sale investments |  | (501,000) |  |  |  |  |  |  | (501,000)
Foreign currency translation adjustments, net of tax |  | (4,216,000) |  |  |  |  |  |  | (4,216,000)
Balance at Dec. 31, 2018 |  | 1,135,263,000 |  | $ 342,000 | [1] | 529,208,000 | 646,214,000 |  | (40,501,000)
Balance, shares at Dec. 31, 2018 | [1] |  |  | 170,820 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option plans |  | 64,581,000 |  | $ 6,000 | [1] | 64,575,000 |  |  |
Issuance of common stock under stock option plans, shares | [1] |  |  | 3,018 |  |  |  |  |
Repurchase of common stock |  | (61,690,000) |  | $ (3,000) | [1] |  | (61,687,000) |  |
Repurchase of common stock, shares | [1] |  |  | (1,398) |  |  |  |  |
Stock-based compensation expense |  | 45,589,000 |  |  |  | 45,589,000 |  |  |
Payment of dividends |  | (35,124,000) |  |  |  |  | (35,124,000) |  |
Net income |  | 203,865,000 |  |  |  |  | 203,865,000 |  |
Net unrealized gain (loss), net of tax of $981, $515, and ($188) in 2020 2019, and 2018, respectively |  | 5,219,000 |  |  |  |  |  |  | 5,219,000
Net unrealized gain (loss) on available-for-sale investments, net of tax |  | 5,219,000 |  |  |  |  |  |  |
Reclassification of net realized (gain) loss on the sale of available-for-sale investments |  | (1,452,000) |  |  |  |  |  |  | (1,452,000)
Foreign currency translation adjustments, net of tax |  | (541,000) |  |  |  |  |  |  | (541,000)
Balance at Dec. 31, 2019 |  | $ 1,355,710,000 |  | $ 345,000 | [1] | 639,372,000 | 753,268,000 |  | (37,275,000)
Balance, shares at Dec. 31, 2019 |  | 172,440 |  | 172,440 | [1] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option plans |  | $ 125,715,000 |  | $ 9,000 | [1] | 125,706,000 |  |  |
Issuance of common stock under stock option plans, shares |  | 4,565 |  | 4,565 | [1] |  |  |  |
Repurchase of common stock |  | $ (51,036,000) |  | $ (2,000) | [1] |  | (51,034,000) |  |
Repurchase of common stock, shares | [1] |  |  | (1,215) |  |  |  |  |
Stock-based compensation expense |  | 42,661,000 |  |  |  | 42,661,000 |  |  |
Payment of dividends |  | (390,508,000) |  |  |  |  | (390,508,000) |  |
Net income |  | 176,186,000 |  |  |  |  |  |  |
Net unrealized gain (loss), net of tax of $981, $515, and ($188) in 2020 2019, and 2018, respectively |  | 6,478,000 |  |  |  |  |  |  | 6,478,000
Net unrealized gain (loss) on available-for-sale investments, net of tax |  | 6,478,000 |  |  |  |  |  |  |
Reclassification of net realized (gain) loss on the sale of available-for-sale investments |  | (4,119,000) |  |  |  |  |  |  | (4,119,000)
Foreign currency translation adjustments, net of tax |  | 1,115,000 |  |  |  |  |  |  | 1,115,000
Balance at Dec. 31, 2020 |  | $ 1,262,202,000 |  | $ 352,000 | [1] | $ 807,739,000 | $ 487,912,000 |  | $ (33,801,000)
Balance, shares at Dec. 31, 2020 |  | 175,790 |  | 175,790 | [1] |  |  |  |
[1] | Prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the fourth quarter of 2017.

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