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Statements Of Changes In Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Share Capital [Member]
Additional Paid-In Capital [Member]
Treasury Shares At Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total Comprehensive Income [Member]
Total
Balance at Dec. 31, 2008 $ 774 $ 503,408 $ (1,105,250) $ (4,673) $ 2,621,606   $ 2,015,865
Tax benefit related to exercise of stock options   7,502         7,502
Issuance of treasury shares under stock plans, upon exercise of options and vesting of restricted stock units   (13,943) 107,783   (862)   92,978
Treasury shares at cost     (202,285)       (202,285)
Stock-based compensation expense related to employees   30,907         30,907
Comprehensive income, net of tax              
Reclassification adjustments to income on marketable securities, net of tax       104   104 104
Other than temporary impairment, net of tax       2,523   2,523 2,523
Unrealized gain (loss) on marketable securities, net of tax       14,601   14,601 14,601
Net income         357,523 357,523 357,523
Total comprehensive income           374,751  
Unrealized gain (loss) on marketable securities, net of tax       12,555      
Accumulated other comprehensive income       12,555      
Balance at Dec. 31, 2009 774 527,874 (1,199,752) 12,555 2,978,267   2,319,718
Tax benefit related to exercise of stock options   4,763         4,763
Issuance of treasury shares under stock plans, upon exercise of options and vesting of restricted stock units   12,459 93,370   (2,014)   103,815
Treasury shares at cost     (200,000)       (200,000)
Stock-based compensation expense related to employees   35,180         35,180
Comprehensive income, net of tax              
Reclassification adjustments to income on marketable securities, net of tax       (974)   (974) (974)
Other than temporary impairment, net of tax       659   659 659
Unrealized gain (loss) on marketable securities, net of tax       3,344   3,344 3,344
Net income         452,826 452,826 452,826
Total comprehensive income           455,855  
Unrealized gain (loss) on marketable securities, net of tax       15,584      
Accumulated other comprehensive income       15,584     15,584
Balance at Dec. 31, 2010 774 580,276 (1,306,382) 15,584 3,429,079   2,719,331
Tax benefit related to exercise of stock options   7,956         7,956
Acquisition of non-controlling interest in Sofaware   (6,556)         (6,556)
Issuance of treasury shares under stock plans, upon exercise of options and vesting of restricted stock units   8,997 62,496       71,493
Treasury shares at cost     (300,000)       (300,000)
Stock-based compensation expense related to employees   39,835         39,835
Comprehensive income, net of tax              
Reclassification adjustments to income on marketable securities, net of tax       (374)   (374) (374)
Gain on sale of marketable securities previously impaired       (1,654)   (1,654) (1,654)
Unrealized gain (loss) on marketable securities, net of tax       (681)   (681) (681)
Unrealized loss on forward contracts       (225)   (225) (225)
Net income         543,966 543,966 543,966
Total comprehensive income           541,032  
Unrealized gain on marketable securities and forward contracts, net of tax       12,650      
Accumulated other comprehensive income       12,650     12,650
Balance at Dec. 31, 2011 $ 774 $ 630,508 $ (1,543,886) $ 12,650 $ 3,973,045   $ 3,073,091