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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jul. 01, 2018
Cash flows from operating activities: |  |
Net income | $ 206,535 | $ 188,010
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 33,882 | 33,156
Amortization | 24,976 | 20,177
Stock-based compensation | 18,109 | 17,625
Deferred taxes | 515 | 17,312
Provision for excess and obsolete inventory | 5,799 | 6,175
Contingent consideration fair value adjustment | (8,701) | (8,468)
(Gains) losses on marketable securities | (3,741) | 762
Retirement plan actuarial losses (gains) | 448 | (71)
Other | 429 | 406
Changes in operating assets and liabilities, net of businesses acquired: |  |
Accounts receivable | (79,478) | (179,403)
Inventories | (2,447) | (21,283)
Prepayments and other assets | (17,067) | 1,641
Accounts payable and other liabilities | (14,424) | (8,155)
Deferred revenue and customer advances | 15,826 | 10,518
Retirement plans contributions | (2,414) | (2,173)
Income taxes | (14,973) | (26,308)
Net cash provided by operating activities | 163,274 | 49,921
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (58,956) | (62,663)
Purchases of marketable securities | (484,181) | (647,071)
Proceeds from sales of marketable securities | 42,454 | 829,053
Proceeds from maturities of marketable securities | 233,193 | 469,862
Proceeds from life insurance | 273 |
Purchase of investments and acquisition of businesses, net of cash acquired | (21,970) | (170,632)
Net cash (used for) provided by investing activities | (289,187) | 418,549
Cash flows from financing activities: |  |
Issuance of common stock under stock purchase and stock option plans | 15,089 | 10,681
Repurchase of common stock | (247,222) | (360,795)
Dividend payments | (31,019) | (34,682)
Payments related to net settlement of employee stock compensation awards | (14,446) | (19,751)
Payments of contingent consideration | (27,615) | (13,571)
Net cash used for financing activities | (305,213) | (418,118)
Effects of exchange rate changes on cash and cash equivalents | (519) | 189
(Decrease) increase in cash and cash equivalents | (431,645) | 50,541
Cash and cash equivalents at beginning of period | 926,752 | 429,843
Cash and cash equivalents at end of period | $ 495,107 | $ 480,384

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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686 + Details
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