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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

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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- Definition Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain (loss), net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains (losses) realized upon the sale of securities, after tax; and (3) the unrealized gains (losses) realized upon the write-down of securities, after tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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