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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | ---
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 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 3,661 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 9,273 | $ 458 | 8,815 |  |
Proceeds from issuance of warrants |  | $ 2,653 | (2,653) |  |
Warrant settlement Shares |  | 21,221 |  |  |
Stock-based compensation expense | 39,868 |  | 39,868 |  |
Tax benefit related to stock options and restricted stock units | 209 |  | 209 |  |
Cash dividends | (37,425) |  |  |  | (37,425)
Net income (loss) | 81,272 |  |  |  | 81,272
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $1,449, (1,667), 923, respectively | 2,417 |  |  | 2,417 |
Less: Reclassification adjustment for gains included in net income, net of tax of $(645), $(390), (255), respectively | (1,433) |  |  | (1,433) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(190), respectively | (295) |  |  | (295) |
Balance, at Dec. 31, 2014 | 2,078,980 | $ 27,077 | 1,437,135 | 4,689 | 610,079
Balance, Shares at Dec. 31, 2014 |  | 216,613 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 2,649 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 8,933 | $ 331 | 8,602 |  |
Stock-based compensation expense | 30,285 |  | 30,285 |  |
Repurchase of common stock | (299,949) | $ (1,953) |  |  | (297,996)
Repurchase of common stock (in shares) |  | (15,621) |  |  |
Tax benefit related to stock options and restricted stock units | 4,625 |  | 4,625 |  |
Cash dividends | (50,732) |  |  |  | (50,732)
Net income (loss) | 206,477 |  |  |  | 206,477
Foreign currency translation adjustment | (8,759) |  |  | (8,759) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $1,449, (1,667), 923, respectively | (3,075) |  |  | (3,075) |
Less: Reclassification adjustment for gains included in net income, net of tax of $(645), $(390), (255), respectively | (704) |  |  | (704) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(190), respectively | (295) |  |  | (295) |
Balance, at Dec. 31, 2015 | 1,965,786 | $ 25,455 | 1,480,647 | (8,144) | 467,828
Balance, Shares at Dec. 31, 2015 |  | 203,641 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 2,377 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 10,665 | $ 297 | 10,368 |  |
Equity component of convertible notes | 100,836 |  | 100,836 |  |
Equity component of convertible notes issuance cost | (2,017) |  | (2,017) |  |
Purchase of convertible notes hedges | (100,834) |  | (100,834) |  |
Proceeds from issuance of warrants | 67,852 |  | 67,852 |  |
Stock-based compensation expense | 30,745 |  | 30,745 |  |
Repurchase of common stock | (146,331) | $ (855) |  |  | (145,476)
Repurchase of common stock (in shares) |  | (6,841) |  |  |
Tax benefit related to stock options and restricted stock units | 6,087 |  | 6,087 |  |
Cash dividends | (48,639) |  |  |  | (48,639)
Net income (loss) | (43,421) |  |  |  | (43,421)
Foreign currency translation adjustment | (13,162) |  |  | (13,162) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $1,449, (1,667), 923, respectively | 2,037 |  |  | 2,037 |
Less: Reclassification adjustment for gains included in net income, net of tax of $(645), $(390), (255), respectively | (683) |  |  | (683) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(190), respectively | (321) |  |  | (321) |
Prior service income arising during period, net of tax of $34 | 59 |  |  | 59 |
Balance, at Dec. 31, 2016 | $ 1,828,659 | $ 24,897 | $ 1,593,684 | $ (20,214) | $ 230,292
Balance, Shares at Dec. 31, 2016 |  | 199,177 |  |  |

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