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v3.19.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Apr. 01, 2018
Cash flows from operating activities: |  |
Net income | $ 33,104 | $ 37,217
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 12,281 | 13,194
Depreciation of property, plant, and equipment | 5,175 | 4,430
Amortization of intangible assets | 769 | 769
Amortization of discounts or premiums on investments | (1,461) | 56
Realized (gain) loss on sale of investments | (40) | (22)
Revaluation of contingent consideration | (985) | (442)
Change in deferred income taxes | (1,140) | (1,469)
Change in operating assets and liabilities: |  |
Accounts receivable | 12,827 | 24,830
Unbilled revenue | (1,890) | 3,389
Inventories | 4,073 | (27,321)
Prepaid expenses and other current assets | 3,191 | (866)
Operating Lease, Payments, Use |  | 0
Accounts payable | 4,245 | 5,309
Accrued expenses | (11,708) | (9,927)
Accrued income taxes | (3,501) | 186
Deferred revenue and customer deposits | 6,760 | 5,877
Other | (439) | (424)
Net cash provided by operating activities | 61,261 | 54,786
Cash flows from investing activities: |  |
Purchases of investments | (258,596) | (118,108)
Maturities and sales of investments | 193,572 | 144,337
Purchases of property, plant, and equipment | (5,078) | (13,270)
Net cash provided by (used in) investing activities | (70,102) | 12,959
Cash flows from financing activities: |  |
Issuance of common stock under stock plans | 14,346 | 11,123
Repurchase of common stock | 0 | (69,202)
Payment of dividends | (8,564) | (7,787)
Net cash provided by (used in) financing activities | 5,782 | (65,866)
Effect of foreign exchange rate changes on cash and cash equivalents | 143 | 1,111
Net change in cash and cash equivalents | (2,916) | 2,990
Cash and cash equivalents at beginning of period | 108,212 | 106,582
Cash and cash equivalents at end of period | $ 105,296 | $ 109,572

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_StockOptionPlanExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration