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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Share capital
Additional paid-in capital
Treasury shares at cost
Accumulated other comprehensive income (Loss)
Retained earnings
Balance at Dec. 31, 2014 $ 3,637,559 $ 774 $ 859,124 $ (3,126,685) $ (1,070) $ 5,905,416
Excess tax benefit from stock-based compensation 19,376   19,376      
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted 102,852   33,703 69,149    
Treasury shares at cost (985,735)     (985,735)    
Stock-based compensation 74,005   74,005      
Replacement of restricted share units upon acquisitions 1,123   1,123      
Other comprehensive loss, net of tax (3,180)       (3,180)  
Net income 685,866         685,866
Balance at Dec. 31, 2015 3,531,866 774 987,331 (4,043,271) (4,250) 6,591,282
Excess tax benefit from stock-based compensation 17,380   17,380      
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted 129,196   54,200 74,996    
Treasury shares at cost (987,897)     (987,897)    
Stock-based compensation 80,731   80,731      
Other comprehensive loss, net of tax (5,000)       (5,000)  
Net income 724,847         724,847
Balance at Dec. 31, 2016 3,491,123 774 1,139,642 (4,956,172) (9,250) 7,316,129
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted 127,518   69,206 58,312    
Treasury shares at cost (995,322)     (995,322)    
Stock-based compensation 93,515   93,515      
Other comprehensive loss, net of tax (6,384)       (6,384)  
Net income 802,923         802,923
Balance at Dec. 31, 2017 3,600,123 $ 774 1,305,130 $ (5,893,182) $ (15,634) 8,203,035
Cumulative-effect adjustment from adoption of ASU 2016-09 $ 86,750   $ 2,767     $ 83,983