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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.