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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net income | $ 543,966 | $ 452,826 | $ 357,523
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of property and equipment | 7,620 | 6,890 | 8,885
Amortization of premium and accretion of discount on marketable securities, net | 28,092 | 14,428 | 8,414
Net gain (impairment net of gains) on sale of marketable securities previously impaired | (2,017) | 785 | 1,277
Realized gain on sale of marketable securities, net | (672) | (974) | 1,896
Amortization of intangible assets | 43,925 | 51,876 | 50,653
Stock-based compensation | 39,835 | 35,180 | 30,907
Deferred income taxes, net | (11,552) | (11,674) | (11,386)
Decrease (increase) in trade receivables, net of allowances for doubtful accounts and sales reserves | (73,674) | 536 | (11,256)
Decrease (increase) in prepaid expenses and other current assets and other assets | (4,917) | (5,742) | 1,285
Increase (decrease) in trade payables | (5,999) | 789 | (2,405)
Increase in employees and payroll accruals | 8,988 | 13,647 | 20,163
Increase in accrued expenses and other liabilities | 90,384 | 97,178 | 63,026
Increase in deferred revenues | 87,487 | 37,649 | 46,006
Excess tax benefit from stock-based compensation | (7,956) | (4,763) | (7,502)
Increase (decrease) in accrued severance pay, net | (546) | (55) | (379)
Net cash provided by operating activities | 742,964 | 688,576 | 557,107
Cash flows from investing activities: |  |  |
Cash paid in conjunction with acquisitions, net of acquired cash | (15,060) | (13,957) | (58,787)
Proceeds from maturity of marketable securities | 820,365 | 605,725 | 427,660
Proceeds from sale of marketable securities | 23,655 | 44,096 | 27,006
Investment in marketable securities | (1,173,398) | (1,090,416) | (1,002,305)
Investment in short-term deposits | (222,455) |  | 26,302
Purchase of property and equipment | (7,195) | (4,910) | (4,283)
Net cash used in investing activities | (574,088) | (459,462) | (584,407)
Cash flows from financing activities: |  |  |
Proceeds from issuance of shares under stock purchase plan and upon exercise of options | 71,493 | 103,815 | 92,978
Acquisition of non-controlling interest in Sofaware | (6,556) |  |
Purchase of treasury shares at cost | (300,000) | (200,000) | (202,285)
Excess tax benefit from stock-based compensation | 7,956 | 4,763 | 7,502
Net cash used in financing activities | (227,107) | (91,422) | (101,805)
Increase (decrease) in cash and cash equivalents | (58,231) | 137,692 | (129,105)
Cash and cash equivalents at the beginning of the year | 551,777 | 414,085 | 543,190
Cash and cash equivalents at the end of the year | 493,546 | 551,777 | 414,085
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for income taxes | 63,593 | 59,945 | 55,440
Supplemental disclosures of non cash financing and investing activities |  |  |
Net change in unrealized gain (loss) on marketable securities | $ (3,741) | $ 3,899 | $ 22,521

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- Definition The net cash inflow or outflow from financing activity for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 + Details
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- Definition The net cash inflow or outflow from investing activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 115 -Paragraph 18 -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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