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v3.20.2

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 27, 2020 | Sep. 29, 2019
Cash flows from operating activities: |  |
Net income | $ 106,841 | $ 123,538
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 32,076 | 33,442
Depreciation of property, plant, and equipment | 16,467 | 15,800
Amortization of intangible assets | 3,437 | 2,119
Intangible asset impairment charges | 19,571 | 0
Excess and obsolete inventory charges | 9,386 | 4,121
Operating lease asset impairment charges | 2,534 | 0
Amortization of discounts or premiums on investments | 765 | (563)
Realized gain on sale of investments | (3,591) | (716)
Credit loss on investments | 75 | 0
Revaluation of contingent consideration | (114) | (1,401)
Change in deferred income taxes | 3,194 | (1,805)
Accounts receivable | (23,878) | 11,387
Unbilled revenue | (10,606) | (2,900)
Inventories | (3,065) | 13,898
Prepaid expenses and other current assets | (10,718) | 5,827
Accounts payable | 3,587 | (3,398)
Accrued expenses | 17,028 | (11,827)
Accrued income taxes | (23,627) | (1,043)
Deferred revenue and customer deposits | 19,066 | 698
Other | 1,022 | (1,616)
Net cash provided by operating activities | 159,450 | 185,561
Cash flows from investing activities: |  |
Purchases of investments | (601,447) | (883,363)
Maturities and sales of investments | 567,245 | 781,929
Purchases of property, plant, and equipment | (9,829) | (13,518)
Net cash provided by (used in) investing activities | (44,031) | (114,952)
Cash flows from financing activities: |  |
Issuance of common stock under stock plans | 91,390 | 31,780
Repurchase of common stock | (51,036) | (61,690)
Payment of dividends | (28,554) | (25,682)
Payment of contingent consideration | (1,039) | 0
Net cash provided by (used in) financing activities | 10,761 | (55,592)
Effect of foreign exchange rate changes on cash and cash equivalents | 745 | (1,528)
Net change in cash and cash equivalents | 126,925 | 13,489
Cash and cash equivalents at beginning of period | 171,431 | 108,212
Cash and cash equivalents at end of period | $ 298,356 | $ 121,701

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