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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, 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 stock units 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 stock units 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 | Accounting Standards Update 2016-09 86,750   2,767     83,983
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted stock units 353,501   201,156 152,345    
Treasury shares at cost (1,103,865)     (1,103,865)    
Stock-based compensation 89,327   89,327      
Other comprehensive loss, net of tax (8,863)       (8,863)  
Fair value of awards attributable to pre-acquisition services 2,187   2,187      
Net income 821,305         821,305
Balance at Dec. 31, 2018 3,772,389 $ 774 $ 1,597,800 $ (6,844,702) $ (24,497) 9,043,014
Cumulative-effect adjustment from adoption | ASC 606 19,116         19,116
Cumulative-effect adjustment from adoption | Accounting Standards Update 2016-16 $ (442)         $ (442)