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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 572,285 | $ 172 | $ 165,162 | $ 436,466 | $ (29,515)
Beginning Balance, Shares at Dec. 31, 2012 |  | 86,110 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | 27,792 | $ 2 | 27,790 |  |
Issuance of common stock under stock option plans, shares |  | 2,440 |  |  |
Repurchase of common stock | (47,908) |  |  | (47,908) |
Repurchase of common stock, shares |  | (1,719) |  |  |
Stock-based compensation expense | 10,620 |  | 10,620 |  |
Excess tax benefit from stock option exercises | 7,658 |  | 7,658 |  |
Tax benefit for research and development credits as a result of stock options | 210 |  | 210 |  |
Net income | 73,573 |  |  | 73,573 |
Net unrealized gain (loss) on cash flow hedges, net of tax | 104 |  |  |  | 104
Reclassification of net realized (gain) loss into current operations | 0 |  |  |  |
Net unrealized gain (loss) on available-for-sale investments, net of tax | (190) |  |  |  | (190)
Reclassification of net realized gain on the sale of available-for-sale investments | (314) |  |  |  | (314)
Foreign currency translation adjustments, net of tax | 82 |  |  |  | 82
Balance at Dec. 31, 2013 | 643,912 | $ 174 | 211,440 | 462,131 | (29,833)
Balance, Shares at Dec. 31, 2013 |  | 86,831 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | 16,930 | $ 2 | 16,928 |  |
Issuance of common stock under stock option plans, shares |  | 1,245 |  |  |
Repurchase of common stock | (59,673) | $ (3) |  | (59,670) |
Repurchase of common stock, shares |  | (1,534) |  |  |
Stock-based compensation expense | 15,158 |  | 15,158 |  |
Excess tax benefit from stock option exercises | 7,871 |  | 7,871 |  |
Tax benefit for research and development credits as a result of stock options | 320 |  | 320 |  |
Net income | 121,485 |  |  | 121,485 |
Net unrealized gain (loss) on cash flow hedges, net of tax | (118) |  |  |  | (118)
Reclassification of net realized (gain) loss into current operations | 46 |  |  |  | 46
Net unrealized gain (loss) on available-for-sale investments, net of tax | 579 |  |  |  | 579
Reclassification of net realized gain on the sale of available-for-sale investments | (673) |  |  |  | (673)
Foreign currency translation adjustments, net of tax | (9,400) |  |  |  | (9,400)
Balance at Dec. 31, 2014 | $ 736,437 | $ 173 | 251,717 | 523,946 | (39,399)
Balance, Shares at Dec. 31, 2014 | 86,542 | 86,542 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | $ 27,582 | $ 3 | 27,579 |  |
Issuance of common stock under stock option plans, shares | 1,520 | 1,520 |  |  |
Repurchase of common stock | $ (126,351) | $ (6) |  | (126,345) |
Repurchase of common stock, shares |  | (3,206) |  |  |
Stock-based compensation expense | 21,274 |  | 21,274 |  |
Excess tax benefit from stock option exercises | 9,964 |  | 9,964 |  |
Tax benefit for research and development credits as a result of stock options | 474 |  | 474 |  |
Payment of dividends | (18,062) |  |  | (18,062) |
Net income | 187,074 |  |  | 187,074 |
Net unrealized gain (loss) on cash flow hedges, net of tax | (27) |  |  |  | (27)
Reclassification of net realized (gain) loss into current operations | 201 |  |  |  | 201
Net unrealized gain (loss) on available-for-sale investments, net of tax | (939) |  |  |  | (939)
Reclassification of net realized gain on the sale of available-for-sale investments | (344) |  |  |  | (344)
Foreign currency translation adjustments, net of tax | (11,616) |  |  |  | (11,616)
Balance at Dec. 31, 2015 | $ 825,667 | $ 170 | $ 311,008 | $ 566,613 | $ (52,124)
Balance, Shares at Dec. 31, 2015 | 84,856 | 84,856 |  |  |

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