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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, 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) | (15,600) | (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 $(1,667), 923, 1903 respectively | (3,075) |  |  | (3,075) |
Less: reclassification adjustment for gains included in net income, net of tax $(390), (255), (297) respectively | (704) |  |  | (704) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $$(169), $(190), (154) respectively | (295) |  |  | (295) |
Balance, at Dec. 31, 2015 | 1,965,786 | $ 25,455 | 1,480,647 | (8,144) | 467,828
Balance, Shares at Dec. 31, 2015 |  | 203,641 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 2,377 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 10,665 | $ 297 | 10,368 |  |
Equity component of convertible debt | 100,836 |  | 100,836 |  |
Equity component of convertible notes issuance cost | (2,017) |  | (2,017) |  |
Purchase of convertible notes hedges | (100,834) |  | (100,834) |  |
Proceeds from issuance of warrants | 67,852 |  | 67,852 |  |
Stock-based compensation expense | 30,745 |  | 30,745 |  |
Repurchase of common stock | $ (146,331) | $ (855) |  |  | (145,476)
Repurchase of common stock (in shares) | (6,800) | (6,841) |  |  |
Tax benefit related to stock options and restricted stock units | $ 6,087 |  | 6,087 |  |
Cash dividends | (48,639) |  |  |  | (48,639)
Net income (loss) | (43,421) |  |  |  | (43,421)
Foreign currency translation adjustment | (13,162) |  |  | (13,162) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), 923, 1903 respectively | 2,037 |  |  | 2,037 |
Less: reclassification adjustment for gains included in net income, net of tax $(390), (255), (297) respectively | (683) |  |  | (683) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $$(169), $(190), (154) 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 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  | 2,211 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 11,024 | $ 277 | 10,747 |  |
Stock-based compensation expense | 33,982 |  | 33,982 |  |
Repurchase of common stock | (200,304) | $ (730) |  |  | (199,574)
Repurchase of common stock (in shares) |  | (5,840) |  |  |
Cumulative effect adjustment for prior year tax benefits related to stock options and restricted stock units | 39,081 |  |  |  | 39,081
Cash dividends | (55,478) |  |  |  | (55,478)
Net income (loss) | 257,692 |  |  |  | 257,692
Foreign currency translation adjustment | 37,840 |  |  | 37,840 |
Unrealized gains (losses) on marketable securities: |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), 923, 1903 respectively | 1,863 |  |  | 1,863 |
Less: reclassification adjustment for gains included in net income, net of tax $(390), (255), (297) respectively | (441) |  |  | (441) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $$(169), $(190), (154) respectively | (272) |  |  | (272) |
Balance, at Dec. 31, 2017 | $ 1,953,646 | $ 24,444 | $ 1,638,413 | $ 18,776 | $ 272,013
Balance, Shares at Dec. 31, 2017 |  | 195,548 |  |  |

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