v2.4.0.8

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 232,453 | $ 150 | $ (2,995) | $ 251,844 | $ 2,181 | $ (18,727)
Balance, shares at Dec. 31, 2010 |  | 150,172,000 | (1,409,000) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 6,229,000 |  |  |  |
Exercise of stock options | 19,968 | 6 |  | 19,962 |  |
Stock-based compensation expense | 19,015 |  |  | 19,015 |  |
Income tax benefit from employee stock option plans | 26,205 |  |  | 26,205 |  |
Net unrealized gain (loss) on investments—net of taxes | (1,153) |  |  |  | (1,153) |
Net unrealized loss on derivatives qualifying as cash flow hedges | (74) |  |  |  | (74) |
Net change in cumulative translation adjustments | (552) |  |  |  | (552) |
Net income | 62,492 |  |  |  |  | 62,492
Balance at Dec. 31, 2011 | 358,354 | 156 | (2,995) | 317,026 | 402 | 43,765
Balance, shares at Dec. 31, 2011 |  | 156,401,000 | (1,409,000) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 4,779,000 |  |  |  |
Exercise of stock options | 27,183 | 5 |  | 27,178 |  |
Issuance of common stock in connection with employee stock purchase plan (in shares) |  | 577,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 10,904 | 1 |  | 10,903 |  |
Stock-based compensation expense | 30,690 |  |  | 30,690 |  |
Income tax benefit from employee stock option plans | 14,278 |  |  | 14,278 |  |
Net unrealized gain (loss) on investments—net of taxes | 2,165 |  |  |  | 2,165 |
Net change in cumulative translation adjustments | 524 |  |  |  | 524 |
Net income | 66,836 |  |  |  |  | 66,836
Balance at Dec. 31, 2012 | 510,934 | 162 | (2,995) | 400,075 | 3,091 | 110,601
Balance, shares at Dec. 31, 2012 |  | 161,757,000 | (1,409,000) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options (in shares) |  | 2,488,000 |  |  |  |
Exercise of stock options | 12,888 | 2 |  | 12,886 |  |
Issuance of common stock in connection with employee stock purchase plan (in shares) |  | 672,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 12,696 | 1 |  | 12,695 |  |
Issuance of common stock upon vesting of restricted stock units |  | 228,000 |  |  |  |
Tax withholding upon vesting of restricted stock awards (in shares) |  | (70,000) |  |  |  |
Tax withholding upon vesting of restricted stock awards | (1,452) |  |  | (1,452) |  |
Repurchase and retirement of common stock (in shares) | 2,100,000 | (3,540,000) | 1,409,000 |  |  |
Repurchase and retirement of common stock | (38,949) | (4) | 2,995 | (8,929) |  | (33,011)
Stock-based compensation expense | 43,909 |  |  | 43,909 |  |
Income tax benefit from employee stock option plans | 3,460 |  |  | 3,460 |  |
Net unrealized gain (loss) on investments—net of taxes | (382) |  |  |  | (382) |
Net change in cumulative translation adjustments | (1,617) |  |  |  | (1,617) |
Net income | 44,273 |  |  |  |  | 44,273
Balance at Dec. 31, 2013 | $ 585,760 | $ 161 | $ 0 | $ 462,644 | $ 1,092 | $ 121,863
Balance, shares at Dec. 31, 2013 |  | 161,535,000 | 0 |  |  |

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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