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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