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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, 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 $923, 1903, (722) respectively |  | 2,037 |  |  | 2,037 |
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $(255), $(297), $(21) respectively |  | (683) |  |  | (683) |
Amortization of prior service benefit, net of tax of $(190), $(154), $(71) respectively |  | (321) |  |  | (321) |
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 |  |  |  |  | 1,004 |
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 |  |  |
Net income (loss) | [1] | 85,221 |  |  |  |
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 $923, 1903, (722) respectively |  | 1,863 |  |  | 1,863 |
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $(255), $(297), $(21) respectively |  | (441) |  |  | (441) |
Amortization of prior service benefit, net of tax of $(190), $(154), $(71) respectively |  | (272) |  |  | (272) |
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 |  | 713 |  |  | 713 |
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 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 1,613 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax |  | 129 | $ 201 | (72) |  |
Stock-based compensation expense |  | 33,304 |  | 33,304 |  |
Repurchase of common stock |  | (832,356) | $ (2,705) |  |  | (829,651)
Repurchase of common stock (in shares) |  |  | (21,639) |  |  |
Cash dividends |  | (67,367) |  |  |  | (67,367)
Net income (loss) |  | 451,779 |  |  |  | 451,779
Foreign currency translation adjustment |  | (28,442) |  |  | (28,442) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $923, 1903, (722) respectively |  | (2,110) |  |  | (2,110) |
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $(255), $(297), $(21) respectively |  | 1,337 |  |  | 1,337 |
Reclassification of unrealized gains on equity securities, net of tax of $(902) |  | 0 |  |  | (3,125) | 3,125
Amortization of prior service benefit, net of tax of $(190), $(154), $(71) respectively |  | (245) |  |  | (245) |
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 |  | 0 |  |  | 769 | (769)
Balance at Dec. 31, 2018 |  | 1,522,354 | $ 21,940 | $ 1,671,645 | $ (13,040) | (158,191)
Balance, Shares at Dec. 31, 2018 |  |  | 175,522 |  |  |
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |
Cumulative effect of changes in accounting principle related to revenue recognition |  | $ 12,679 |  |  |  | $ 12,679
[1] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.

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