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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |
Net income |  | $ 802,923 | $ 724,847 | $ 685,866
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation of property and equipment |  | 12,876 | 10,883 | 10,358
Amortization of premium and accretion of discount on marketable securities, net |  | 20,012 | 23,388 | 29,611
Realized loss (gain) on sale of marketable securities, net |  | 176 | (2,993) | (16)
Amortization of intangible assets |  | 3,760 | 3,853 | 3,612
Stock-based compensation |  | 87,459 | 82,732 | 76,302
Deferred income tax expense (benefit) |  | 64,630 | (32,594) | (15,847)
Excess tax benefit from stock-based compensation |  |  | (17,380) | (19,376)
Decrease in accrued severance pay, net |  | 711 | 147 | 197
Decrease (increase) in trade receivables, net |  | 6,284 | (67,744) | (43,384)
Decrease (increase) in prepaid expenses and other current assets and other assets |  | 5,615 | 11,234 | (21,404)
Increase (decrease) in trade payables |  | (7,795) | 2,184 | 5,183
Increase (decrease) in employees and payroll accruals |  | (4,546) | 19,345 | 13,835
Increase (decrease) in income tax accrual and accrued expenses and other current liabilities | [1] | (3,486) | 31,565 | 104,006
Increase in deferred revenues |  | 120,989 | 159,801 | 120,559
Net cash provided by operating activities |  | 1,109,608 | 949,268 | 949,503
Cash flows from investing activities: |  |  |  |
Proceeds from maturity of marketable securities |  | 1,363,698 | 1,525,929 | 1,479,241
Proceeds from sale of marketable securities |  | 66,101 | 235,252 | 109,735
Proceeds from short-term bank deposits |  | 106,609 |  | 321
Investment in marketable securities |  | (1,686,445) | (1,746,931) | (1,628,287)
Investment in short-term bank deposits |  |  | (100,000) |
Cash paid in conjunction with acquisitions, net of acquired cash |  |  |  | (96,544)
Purchase of property and equipment |  | (28,784) | (24,050) | (17,348)
Net cash used in investing activities |  | (178,821) | (109,800) | (152,882)
Cash flows from financing activities: |  |  |  |
Proceeds from issuance of treasury shares upon exercise of options |  | 127,518 | 129,196 | 102,852
Purchase of treasury shares at cost |  | (995,322) | (987,897) | (985,735)
Payments related to shares withheld for taxes | [1] | (5,397) | (3,031) | (2,771)
Excess tax benefit from stock-based compensation |  |  | 17,380 | 19,376
Net cash used in financing activities |  | (873,201) | (844,352) | (866,278)
Increase (decrease) in cash and cash equivalents |  | 57,586 | (4,884) | (69,658)
Cash and cash equivalents at the beginning of the year |  | 187,428 | 192,312 | 261,970
Cash and cash equivalents at the end of the year |  | 245,014 | 187,428 | 192,312
Supplemental disclosure of cash flow information: |  |  |  |
Cash paid during the year for taxes on income |  | $ 143,036 | $ 180,071 | 123,944
Supplemental disclosure of non-cash activities: |  |  |  |
Replacement of restricted share units upon acquisitions |  |  |  | $ 1,123
[1] | Payments related to shares withheld for taxes during the years ended December 31, 2016 and 2015 were reclassified from operating activity to financing activity following ASU 2016-09 adoption.

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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + 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=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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=82896770&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=98514028&loc=d3e3179-108585 + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&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=98514028&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&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=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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