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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) | 1.125% Convertible Senior Notes due 2018 | 1.125% Convertible Senior Notes due 2018 Additional Paid-in Capital | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Net income (loss) | $ 211,388 | $ 0 | $ 0 | $ 211,388 | $ 0 |  |  |  |
Foreign currency translation adjustment | 9 |  |  |  | 9 |  |  |  |
Balance at Dec. 31, 2014 | 391,622 | $ 115 | 1,153,435 | (761,526) | (402) |  |  |  |
Balance (in shares) at Dec. 31, 2014 |  | 115,162 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 766 | $ 0 | 0 | 0 | 766 |  |  |  |
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 |  |  |  |
Tax shortfall from stock option forfeitures | (5,312) | 0 | (5,312) | 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 |  |  |  |  |  |  |
Net income (loss) | 6,820 | $ 0 | 0 | 6,820 | 0 |  |  |  |
Foreign currency translation adjustment | (13,485) |  |  |  | (13,485) |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (396) | 0 | 0 | 0 | (396) |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 12,297 | $ 3 | 12,294 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 2,502 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | (736) |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (1) | 17,555 | (17,554) | 0 |  |  |  |
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | 0 |  |  |  |  |  |  |  |
Stock-based compensation | 21,013 | 0 | 21,013 | 0 | 0 |  |  |  |
Balance at Dec. 31, 2016 | 552,782 | $ 111 | 1,181,230 | (615,051) | (13,508) |  |  |  |
Balance (in shares) at Dec. 31, 2016 |  | 111,054 |  |  |  |  |  |  |
Net income (loss) | (22,862) | $ 0 | 0 | (22,862) | 0 |  |  |  |
Foreign currency translation adjustment | 7,798 |  |  |  | 7,798 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 613 | 0 | 0 | 0 | 613 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 10,733 | $ 3 | 10,730 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 2,727 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | (4,017) |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | (36,557) | $ (4) | (13,477) | (36,557) | 0 |  |  |  |
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (50,038) |  |  |  |  |  |  |  |
Stock-based compensation | 27,403 | 0 | 27,403 | 0 | 0 |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  |  |  | $ (16,651) | $ (16,651) | $ 33,913 | $ 33,913
Adjustments to Additional Paid in Capital, Purchase of convertible note hedges | (33,523) |  |  |  |  |  |  |  | $ (33,523)
Adjustments to Additional Paid in Capital, Warrant Issued | 23,173 |  | 23,173 |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | 38,243 |  |  | 38,243 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 571,584 | $ 110 | $ 1,212,798 | $ (636,227) | $ (5,097) |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 109,764 |  |  |  |  |  |  |

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