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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2018 | Apr. 02, 2017
Cash flows from operating activities: |  |
Net income | $ 86,974 | $ 85,221
Adjustments to reconcile net income to net cash used for operating activities: |  |
Depreciation | 16,336 | 16,143
Amortization | 9,204 | 11,070
Stock-based compensation | 9,544 | 8,945
Provision for excess and obsolete inventory | 3,522 | 2,726
Deferred taxes | 8,696 | (3,477)
Contingent consideration adjustment | (4,968) | 634
Other | 1,393 | 2
Changes in operating assets and liabilities, net of business acquired: |  |
Accounts receivable | (140,747) | (123,792)
Inventories | (21,017) | (62,152)
Prepayments and other assets | (679) | 1,104
Accounts payable and other accrued expenses | (46,706) | (7,553)
Deferred revenue and customer advances | 9,644 | (3,333)
Retirement plans contributions | (1,020) | (947)
Income taxes | (12,106) | 14,288
Net cash used for operating activities | (81,930) | (61,121)
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (34,797) | (22,066)
Purchases of marketable securities | (490,324) | (153,317)
Proceeds from sales of marketable securities | 800,671 | 213,593
Proceeds from maturities of marketable securities | 212,698 | 88,184
Acquisition of business, net of cash acquired | (25,356) |
Net cash provided by investing activities | 462,892 | 126,394
Cash flows from financing activities: |  |
Issuance of common stock under stock purchase and stock option plans | 10,654 | 15,084
Repurchase of common stock | (134,276) | (37,730)
Payments related to net settlement of employee stock compensation awards | (19,629) | (12,289)
Dividend payments | (17,588) | (14,021)
Payments of contingent consideration | (13,571) | (1,050)
Net cash used for financing activities | (174,410) | (50,006)
Effects of exchange rate changes on cash and cash equivalents | 1,478 | 1,595
Increase in cash and cash equivalents | 208,030 | 16,862
Cash and cash equivalents at beginning of period | 429,843 | 307,884
Cash and cash equivalents at end of period | $ 637,873 | $ 324,746

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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 maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: 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 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=82896770&loc=d3e26853-111562 + 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 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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