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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Cash flows from operating activities:      
Net income $ 196,216 $ 193,543 $ 124,789
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 23,487 21,127 20,061
Stock-based compensation 39,233 27,417 17,187
Loss on disposal of equipment, intangibles and other assets 357 949 522
Provision for doubtful accounts 687   251
(Benefit) for doubtful accounts   (439)  
(Benefit) provision for amount due from former foreign agent 0 (2,016) (10,477)
(Benefit) provision from deferred income taxes (5,965) (8,274) 17,276
Changes in operating assets and liabilities:      
(Increase) decrease in trade accounts receivable (23,580) 10,826 (19,772)
Increase in inventories (21,257) (1,885) (24,014)
(Increase) decrease in other current assets (8,536) 3,843 (5,406)
Increase in lease receivable, net (11,958) 0 0
Decrease (increase) in deferred costs and other contract assets 3,308 (17,935) (14,102)
(Increase) decrease in other non-current assets (226) 407 (10,771)
Increase (decrease) in accounts payable 9,934 5,211 (4,057)
Increase (decrease) in accrued compensation 5,338 10,195 (4,292)
Increase (decrease) in deferred revenue and other contract-related liabilities 7,739 1,420 (13,295)
Increase (decrease) in income taxes payable 4,079 (1,208) (72,087)
Increase in accrued liabilities 746 3,923 5,282
Increase (decrease) in other non-current liabilities 2,038 (7,577) 28,013
Net cash provided by operating activities 221,640 239,527 56,062
Cash flows from investing activities:      
Purchases of short-term investments (120,000) 0 0
Purchases of property and equipment (68,375) (17,126) (43,684)
Increase in intangible assets (4,117) (5,557) (3,079)
(Purchases of) proceeds from strategic investments (5,189) 453 (1,145)
Business acquisition, net of cash acquired 0 (3,922) 0
Net cash used in investing activities (197,681) (26,152) (47,908)
Cash flows from financing activities:      
Proceeds from issuance of common stock 28,339 44,748 62,205
Repurchases of common stock (37,555) (18,478) (66,272)
Other (123) (490) (71)
Net cash provided by (used in) financing activities (9,339) 25,780 (4,138)
Effect of foreign currency exchange rates on cash 814 (1,997) 3,269
Net increase in cash, cash equivalents and restricted cash 15,434 237,158 7,285
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 568,075 $ 552,641 $ 315,483