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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 159,338 | $ 143,291 | $ 116,920
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 157,142 | 156,301 | 77,801
Stock-based compensation | 67,223 | 56,980 | 40,547
Accrued severance pay, net | 1,020 | (788) | 3
Amortization of premium and discount and accrued interest on marketable securities | (598) | 646 | 2,441
Deferred taxes, net | (30,172) | (70,805) | (25,905)
Changes in operating assets and liabilities: |  |  |
Trade receivables, net | (72,583) | 37,735 | (31,784)
Prepaid expenses and other current assets | (29,852) | (6,839) | 2,078
Trade payables | (3,526) | 2,665 | 4,392
Accrued expenses and other liabilities | 48,095 | 25,541 | 17,994
Deferred revenues | 92,768 | 41,624 | 9,379
Long term liabilities | (1,024) | (5,169) | 7,529
Loss on disposal of discontinued operations |  |  | 9,148
Realized gain on marketable securities |  |  | (3,388)
Amortization of discount on long-term debt | 8,670 | 13,547 | 379
Other | 108 | (67) | 678
Net cash provided by operating activities | 396,609 | 394,662 | 228,212
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (31,442) | (39,889) | (27,278)
Purchase of investments | (429,500) | (133,423) | (47,221)
Proceeds from investments | 137,180 | 64,295 | 449,880
Payments for business acquisitions, net of cash acquired | (104,776) | (76,027) | (1,156,249)
Investments in affiliates and other purchases |  |  | (1,500)
Capitalization of internal use software costs | (32,225) | (27,936) | (8,502)
Repayment from sale of discontinued operations |  |  | (9,148)
Net cash used in investing activities | (460,763) | (212,980) | (800,018)
Cash flows from financing activities: |  |  |
Proceeds from issuance of shares upon exercise of options | 19,048 | 19,240 | 23,525
Purchase of treasury shares | (26,004) | (24,428) | (43,630)
Dividends paid |  | (9,637) | (38,202)
Capital lease payments | (876) | (137) | (1,087)
Proceeds from issuance of debt, net of costs |  |  | 464,841
Proceeds from issuance of exchangeable senior notes, net |  | 260,135 |
Repayment of long-term debt |  | (260,000) |
Repayment of short-term debt | (8,436) |  |
Net cash provided by (used in) financing activities | (16,268) | (14,827) | 405,447
Effect of exchange rate changes on cash | (5,781) | 4,421 | (2,546)
Net change in cash and cash equivalents | (86,203) | 171,276 | (168,905)
Cash and cash equivalents at the beginning of the year | 328,302 | 157,026 | 325,931
Cash and cash equivalents at the end of the year | 242,099 | 328,302 | 157,026
Supplemental disclosure of cash flows activities: |  |  |
Income taxes | 42,858 | 33,029 | 28,396
Interest | 12,319 | 7,910 | 2,201
Non-cash activities: |  |  |
Decrease (increase) in other receivables with respect to exercise of share options | 53 | 138 | (99)
Increase in accrued expenses and other liabilities with respect to purchase of treasury shares | $ 1,282 |  |

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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