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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) Income | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | ---
Balance, at Dec. 31, 2010 | $ 1,122,188 | $ 22,755 | $ 1,269,525 | $ 2,469 | $ (172,561)
Balance, Shares at Dec. 31, 2010 |  | 182,035 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 4,185 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 5,088 | 522 | 4,566 |  |
Stock-based compensation expense | 32,337 |  | 32,337 |  |
Repurchase of common stock, shares |  | (2,633) |  |  |
Repurchase of common stock | (31,175) | (329) | (17,770) |  | (13,076)
Stock options issued in purchase acquisition | 4,472 |  | 4,472 |  |
Net income | 369,873 |  |  |  | 369,873
Unrealized gain on marketable securities |  |  |  |  |
Unrealized gain on marketable securities, net of tax of $216 in 2013, $370 in 2012 and $1,247 in 2011 | 1,409 |  |  | 1,409 |
Less: reclassification adjustment for gains included in net income, net of tax of $(257) in 2013, $(201) in 2012 and $(581) in 2011 | (1,412) |  |  | (1,412) |
Foreign currency translation adjustment | 2,266 |  |  | 2,266 |
Amortization of prior service costs, net of tax of $(159) in 2013, $(134) in 2012 and $9 in 2011 | 14 |  |  | 14 |
Balance, at Dec. 31, 2011 | 1,505,060 | 22,948 | 1,293,130 | 4,746 | 184,236
Balance, Shares at Dec. 31, 2011 |  | 183,587 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 4,321 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 6,894 | 540 | 6,354 |  |
Stock-based compensation expense | 39,920 |  | 39,920 |  |
Repurchase of common stock, shares | 0 |  |  |  |
Tax benefit related to stock options and restricted stock units | 8,358 |  | 8,358 |  |
Net income | 217,049 |  |  |  | 217,049
Unrealized gain on marketable securities |  |  |  |  |
Unrealized gain on marketable securities, net of tax of $216 in 2013, $370 in 2012 and $1,247 in 2011 | 2,009 |  |  | 2,009 |
Less: reclassification adjustment for gains included in net income, net of tax of $(257) in 2013, $(201) in 2012 and $(581) in 2011 | (702) |  |  | (702) |
Amortization of prior service costs, net of tax of $(159) in 2013, $(134) in 2012 and $9 in 2011 | (233) |  |  | (233) |
Balance, at Dec. 31, 2012 | 1,778,355 | 23,488 | 1,347,762 | 5,820 | 401,285
Balance, Shares at Dec. 31, 2012 |  | 187,908 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 3,823 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 5,404 | 478 | 4,926 |  |
Stock-based compensation expense | 35,612 |  | 35,612 |  |
Repurchase of common stock, shares | 0 |  |  |  |
Tax benefit related to stock options and restricted stock units | 2,596 |  | 2,596 |  |
Net income | 164,947 |  |  |  | 164,947
Unrealized gain on marketable securities |  |  |  |  |
Unrealized gain on marketable securities, net of tax of $216 in 2013, $370 in 2012 and $1,247 in 2011 | (1,097) |  |  | (1,097) |
Less: reclassification adjustment for gains included in net income, net of tax of $(257) in 2013, $(201) in 2012 and $(581) in 2011 | (447) |  |  | (447) |
Amortization of prior service costs, net of tax of $(159) in 2013, $(134) in 2012 and $9 in 2011 | (276) |  |  | (276) |
Balance, at Dec. 31, 2013 | $ 1,985,094 | $ 23,966 | $ 1,390,896 | $ 4,000 | $ 566,232
Balance, Shares at Dec. 31, 2013 |  | 191,731 |  |  |

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