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Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 29, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net income | $ 44,454 | $ 32,403
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 7,960 | 6,079
Depreciation of property, plant, and equipment | 4,051 | 3,596
Amortization of intangible assets | 1,830 | 1,921
Amortization of discounts or premiums on investments | 1,284 | 1,443
Realized gain on sale of investments | (606) | (83)
Net unrealized loss on trading securities | 0 | 462
Tax effect of stock option exercises | (3,481) | (2,773)
Change in deferred income taxes | (1,507) | (1,748)
Accounts receivable | (16,952) | (3,897)
Inventories | (5,150) | (821)
Deferred costs | (16,189) | (384)
Deferred revenue | 10,516 | (96)
Other | 5,498 | 2,873
Net cash provided by operating activities | 31,708 | 38,975
Cash flows from investing activities: |  |
Purchases of investments | (189,746) | (167,652)
Maturities and sales of investments | 177,280 | 129,329
Purchases of property, plant, and equipment | (5,341) | (4,310)
Net cash used in investing activities | (17,807) | (42,633)
Cash flows from financing activities: |  |
Issuance of common stock under stock option plans | 9,026 | 16,242
Repurchase of common stock | (27,004) | (11,891)
Tax effect of stock option exercises | 3,481 | 2,773
Net cash provided by (used in) financing activities | (14,497) | 7,124
Effect of foreign exchange rate changes on cash and cash equivalents | 124 | (752)
Net change in cash and cash equivalents | (472) | 2,714
Cash and cash equivalents at beginning of period | 40,644 | 45,160
Cash and cash equivalents at end of period | $ 40,172 | $ 47,874

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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=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + 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 -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: 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 Reference 5: 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 6: 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=31042434&loc=d3e3044-108585 + Details
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