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Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Oct. 01, 2017 | Oct. 02, 2016
Cash flows from operating activities: |  |
Net income | $ 51,370 | $ 53,742
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 20,219 | 24,601
Purchase premium amortization/discount accretion on investments, net | 102 | 106
Non-cash stock-based compensation | 16,412 | 14,300
Income tax impact associated with stock option exercises | 0 | 1,627
Deferred income taxes | (66) | 1,327
Changes in assets and liabilities: |  |
Accounts receivable | 18,248 | 56,731
Inventories | (1,216) | (4,503)
Prepaid expenses and other assets | 5,557 | 9,772
Accounts payable | (20,016) | 5,428
Accrued employee compensation | (12,595) | (3,842)
Other accrued liabilities | 12,918 | (24,444)
Deferred revenue | 10,326 | (2,610)
Income taxes payable | 173 | 1,082
Net cash provided by operating activities | 101,432 | 133,317
Cash flows from investing activities: |  |
Purchases of short-term investments | (101,951) | (117,994)
Proceeds from maturities of short-term investments | 101,544 | 85,286
Purchase of property and equipment | (9,805) | (6,984)
Payments to cost method investments | (2,900) | 0
Payments made in connection with business acquisition, net of cash acquired | (737) | 0
Net cash used in investing activities | (13,849) | (39,692)
Cash flows from financing activities: |  |
Repurchases of common stock | (86,630) | (23,252)
Restricted stock unit tax withholdings | (6,017) | (4,364)
Proceeds from exercise of stock options | 6,405 | 21,874
Proceeds from issuance of common stock under employee stock purchase plan | 4,764 | 3,892
Net cash used in financing activities | (81,478) | (1,850)
Net increase in cash and cash equivalents | 6,105 | 91,775
Cash and cash equivalents, at beginning of period | 240,468 | 181,945
Cash and cash equivalents, at end of period | $ 246,573 | $ 273,720

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations 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 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration