Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Cash flows from operating activities:
Net income	$ 40,481	$ 29,727
Adjustments to reconcile net income to net cash provided by operating activities, net of the effects of acquisition:
Depreciation and amortization	17,784	17,905
Stock-based compensation	11,061	14,458
Deferred income taxes, net	2,579	535
Other	3,162	3,106
Changes in operating assets and liabilities — (use) source
Accounts receivable	17,891	67,808
Inventory	24,137	(27,112)
Other current assets	(57,813)	(14,246)
Accounts payable	(20,576)	(52,835)
Accrued expenses and other liabilities	(10,549)	(18,043)
Net cash provided by operating activities	28,157	21,303
Cash flows from investing activities:
Additions of property and equipment	(18,968)	(14,705)
Change in other assets	(2,125)	(4,541)
Cash paid for business acquisition, net of cash acquired	0	(2,817)
Sales and maturities of investments	7,000	5,880
Net cash used in investing activities	(14,093)	(16,183)
Cash flows from financing activities:
Proceeds from employee stock plans	3,690	4,680
Income tax withholding payment associated with restricted stock vesting	(1,816)	(7,277)
Stock repurchases	25,000	0
Net cash used in financing activities	(23,126)	(2,597)
Effect of exchange rate changes on cash and cash equivalents	404	(101)
Net (decrease) increase in cash and cash equivalents	(8,658)	2,422
Cash and cash equivalents, at beginning of period	239,392	130,373
Cash and cash equivalents, at end of period	$ 230,734	$ 132,795