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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss)
--- | --- | --- | --- | --- | ---
Net income (loss) | $ (33,748) | $ 0 | $ 0 | $ (33,748) | $ 0
Balance at Dec. 31, 2012 | 321,594 | $ 112 | 1,075,761 | (753,979) | (300)
Balance (in shares) at Dec. 31, 2012 |  | 111,525 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (5) | $ 0 | 0 | 0 | (5)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 7,865 | $ 1 | 7,864 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,934 |  |  |
Stock-based compensation | 14,981 | $ 0 | 14,981 | 0 | 0
Balance at Dec. 31, 2013 | 340,229 | $ 113 | 1,128,148 | (787,727) | (305)
Balance (in shares) at Dec. 31, 2013 |  | 113,459 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Equity component of 1.125% convertible senior notes due 2018 | 29,542 | $ 0 | 29,542 | 0 | 0
Net income (loss) | 26,201 | 0 | 0 | 26,201 | 0
Unrealized gain (loss) on marketable securities, net of tax | (97) | 0 | 0 | 0 | (97)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 10,559 | $ 2 | 10,557 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,703 |  |  |
Stock-based compensation | 14,730 | $ 0 | 14,730 | 0 | 0
Balance at Dec. 31, 2014 | 391,622 | $ 115 | 1,153,435 | (761,526) | (402)
Balance (in shares) at Dec. 31, 2014 |  | 115,162 |  |  |
Net income (loss) | 211,388 | $ 0 | 0 | 211,388 | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 775 | 0 | 0 | 0 | 775
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | $ 13,077 | $ 2 | 13,075 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,938 |  |  |
Stock Repurchased and Retired During Period, Shares | (7,812) | (7,812) |  |  |
Stock Repurchased and Retired During Period, Value | $ (80,000) | $ (8) | (45,926) | (54,179) | 0
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (100,113) |  |  |  |
Stock-based compensation | 15,096 | 0 | 15,096 | 0 | 0
Balance at Dec. 31, 2015 | 526,533 | $ 109 | 1,130,368 | (604,317) | 373
Balance (in shares) at Dec. 31, 2015 |  | 109,288 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Equity component of 1.125% convertible senior notes due 2018 |  | $ 0 |  | $ 0 | $ 0
Tax shortfall from stock option forfeitures | $ (5,312) |  | $ (5,312) |  |

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