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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Cash flows from operating activities:    
Net income $ 126,234 $ 147,446
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 28,053 22,739
Depreciation of property, plant, and equipment 8,114 8,510
Loss (gain) on disposal of property, plant, and equipment 12 4
Amortization of intangible assets 1,662 1,853
Excess and obsolete inventory charges 741 1,816
Non-cash impact of write-offs related to fire (Note 17) 44,903 0
Amortization of discounts or premiums on investments 2,714 1,840
Realized loss (gain) on sale of investments 24 (68)
Change in deferred income taxes (10,809) 973
Accounts receivable (44,118) (23,488)
Unbilled revenue 1,704 3,844
Inventories (20,122) (9,521)
Prepaid expenses and other current assets (45,752) (28,830)
Accounts payable (23,525) 16,058
Accrued expenses (20,024) 206
Accrued income taxes (372) (5,588)
Deferred revenue and customer deposits 41,535 55,220
Other 2,655 1,711
Net cash provided by operating activities 93,629 194,725
Cash flows from investing activities:    
Purchases of investments (77,760) (511,625)
Maturities and sales of investments 164,610 270,696
Purchases of property, plant, and equipment (11,253) (6,550)
Net cash provided by (used in) investing activities 75,597 (247,479)
Cash flows from financing activities:    
Net proceeds from issuance of common stock under stock plans 4,414 44,407
Repurchase of common stock (154,317) (20,877)
Payment of dividends (22,573) (21,192)
Net cash provided by (used in) financing activities (172,476) 2,338
Effect of foreign exchange rate changes on cash and cash equivalents (5,865) (1,620)
Net change in cash and cash equivalents (9,115) (52,036)
Cash and cash equivalents at beginning of period 186,161 269,073
Cash and cash equivalents at end of period $ 177,046 $ 217,037