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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY - USD ($) shares in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2013 | $ 643,912,000 | $ 174,000 | $ 211,440,000 | $ 462,131,000 | $ (29,833,000)
Beginning Balance, Shares at Dec. 31, 2013 |  | 86,831 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | 16,930,000 | $ 2,000 | 16,928,000 |  |
Issuance of common stock under stock option plans, shares |  | 1,245 |  |  |
Repurchase of common stock | (59,673,000) | $ 3,000 |  | (59,670,000) |
Repurchase of common stock, shares |  | (1,534) |  |  |
Stock-based compensation expense | 15,158,000 |  | 15,158,000 |  |
Excess tax benefit from stock option exercises | 7,871,000 |  | 7,871,000 |  |
Tax benefit for research and development credits as a result of stock options | 320,000 |  | 320,000 |  |
Net income | 121,485,000 |  |  | 121,485,000 |
Net unrealized gain (loss) on cash flow hedges, net of tax | (118,000) |  |  |  | (118,000)
Reclassification of net realized (gain) loss into current operations | 46,000 |  |  |  | 46,000
Net unrealized gain (loss) on available-for-sale investments, net of tax | 579,000 |  |  |  | 579,000
Reclassification of net realized gain on the sale of available-for-sale investments | (673,000) |  |  |  | (673,000)
Foreign currency translation adjustments, net of tax | (9,400,000) |  |  |  | (9,400,000)
Balance at Dec. 31, 2014 | 736,437,000 | $ 173,000 | 251,717,000 | 523,946,000 | (39,399,000)
Balance, Shares at Dec. 31, 2014 |  | 86,542 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | 27,582,000 | $ 3,000 | 27,579,000 |  |
Issuance of common stock under stock option plans, shares |  | 1,520 |  |  |
Repurchase of common stock | (126,351,000) | $ (6,000) |  | (126,345,000) |
Repurchase of common stock, shares |  | (3,206) |  |  |
Stock-based compensation expense | 21,274,000 |  | 21,274,000 |  |
Excess tax benefit from stock option exercises | 9,964,000 |  | 9,964,000 |  |
Tax benefit for research and development credits as a result of stock options | 474,000 |  | 474,000 |  |
Payment of dividends | (18,062,000) |  |  | (18,062,000) |
Net income | 187,074,000 |  |  | 187,074,000 |
Net unrealized gain (loss) on cash flow hedges, net of tax | (27,000) |  |  |  | (27,000)
Reclassification of net realized (gain) loss into current operations | 201,000 |  |  |  | 201,000
Net unrealized gain (loss) on available-for-sale investments, net of tax | (939,000) |  |  |  | (939,000)
Reclassification of net realized gain on the sale of available-for-sale investments | (344,000) |  |  |  | (344,000)
Foreign currency translation adjustments, net of tax | (11,616,000) |  |  |  | (11,616,000)
Balance at Dec. 31, 2015 | $ 825,667,000 | $ 170,000 | 311,008,000 | 566,613,000 | (52,124,000)
Balance, Shares at Dec. 31, 2015 | 84,856 | 84,856 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under stock option plans | $ 43,468,000 | $ 4,000 | 43,464,000 |  |
Issuance of common stock under stock option plans, shares | 1,977 | 1,977 |  |  |
Repurchase of common stock | $ (47,149,000) | $ (2,000) |  | (47,147,000) |
Repurchase of common stock, shares |  | (894) |  |  |
Stock-based compensation expense | 20,558,000 |  | 20,558,000 |  |
Payment of dividends | (25,213,000) |  |  | (25,213,000) |
Net income | 149,572,000 |  |  | 149,572,000 |
Net unrealized gain (loss) on cash flow hedges, net of tax | (567,000) |  |  |  | (567,000)
Reclassification of net realized (gain) loss into current operations | 398,000 |  |  |  | 398,000
Net unrealized gain (loss) on available-for-sale investments, net of tax | 1,672,000 |  |  |  | 1,672,000
Reclassification of net realized gain on the sale of available-for-sale investments | (191,000) |  |  |  | (191,000)
Foreign currency translation adjustments, net of tax | (5,616,000) |  |  |  | (5,616,000)
Balance at Dec. 31, 2016 | $ 962,599,000 | $ 172,000 | $ 375,030,000 | $ 643,825,000 | $ (56,428,000)
Balance, Shares at Dec. 31, 2016 | 85,939 | 85,939 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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