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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net income | $ 724,847 | $ 685,866 | $ 659,571
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of property and equipment | 10,883 | 10,358 | 9,178
Amortization of premium and accretion of discount on marketable securities, net and revaluation of short-term bank deposits | 23,388 | 29,611 | 33,021
Realized gain on sale of marketable securities, net | (2,993) | (16) | (288)
Amortization of intangible assets | 3,853 | 3,612 | 2,106
Stock-based compensation | 82,732 | 76,302 | 63,169
Deferred income tax benefit | (32,594) | (15,847) | (12,292)
Excess tax benefit from stock-based compensation | (17,380) | (19,376) | (11,669)
Decrease (increase) in accrued severance pay, net | 147 | 197 | (407)
Decrease (increase) in trade receivables, net | (67,744) | (43,384) | 12,948
Decrease (increase) in prepaid expenses and other current assets and other assets | 11,234 | (21,404) | (8,613)
Increase in trade payables | 2,184 | 5,183 | 1,879
Increase in employees and payroll accruals | 19,345 | 13,835 | 2,698
Increase (decrease) in income tax accrual and accrued expenses and other current liabilities | 28,534 | 101,235 | (77,809)
Increase in deferred revenues | 159,801 | 120,559 | 112,390
Net cash provided by operating activities | 946,237 | 946,731 | 785,882
Cash flows from investing activities: |  |  |
Proceeds from maturity of marketable securities | 1,525,929 | 1,479,241 | 1,233,866
Proceeds from sale of marketable securities | 235,252 | 109,735 | 75,910
Proceeds from short-term bank deposits |  | 321 |
Investment in marketable securities | (1,746,931) | (1,628,287) | (1,535,800)
Investment in short-term bank deposits | (100,000) |  | (7,343)
Cash paid in conjunction with acquisitions, net of acquired cash |  | (96,544) |
Purchase of property and equipment | (24,050) | (17,348) | (12,736)
Net cash used in investing activities | (109,800) | (152,882) | (246,103)
Cash flows from financing activities: |  |  |
Proceeds from issuance of treasury shares upon exercise of options | 129,196 | 102,852 | 70,266
Purchase of treasury shares at cost | (987,897) | (985,735) | (768,176)
Excess tax benefit from stock-based compensation | 17,380 | 19,376 | 11,669
Net cash used in financing activities | (841,321) | (863,507) | (686,241)
Decrease in cash and cash equivalents | (4,884) | (69,658) | (146,462)
Cash and cash equivalents at the beginning of the year | 192,312 | 261,970 | 408,432
Cash and cash equivalents at the end of the year | 187,428 | 192,312 | 261,970
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for taxes on income | $ 180,071 | 123,944 | $ 239,245
Supplemental disclosure of non-cash activities: |  |  |
Replacement of restricted share units upon acquisitions |  | $ 1,123 |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: 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=66010992&loc=d3e26853-111562 Reference 2: 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=66902209&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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 Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=66010992&loc=d3e26853-111562 Reference 3: 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=66902209&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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