Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019
Operating Activities
Net income	$ 2,244	$ 5,398
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	4,183	4,137
Amortization of other intangible assets and other assets	9,827	10,320
Amortization of debt discount and debt issuance costs	3,736	3,321
Stock-based compensation expense	15,313	12,584
Deferred income taxes	(2,364)	(3,530)
Changes in operating assets and liabilities:
Accounts receivable	1,542	3,323
Inventories	4,777	4,488
Prepaid expenses and other assets	23,576	6,410
Accounts payable	2,748	714
Other current liabilities and income taxes	(9,134)	(15,996)
Deferred revenue and returns liability	4,114	1,477
Other non-current liabilities	(862)	(631)
Net cash provided by operating activities	59,700	32,015
Investing Activities
Purchases of available-for-sale investments	(70,910)	(63,577)
Sales and maturities of available-for-sale investments	126,920	99,068
Purchases of property and equipment	(4,135)	(3,874)
Purchases of other assets	(370)	(414)
Net cash provided by investing activities	51,505	31,203
Financing Activities
Proceeds from revolving line of credit	310,000
Repurchases of common stock	(16,287)	(15,004)
Payment of taxes withheld for vested stock awards	(16,294)	(14,113)
Net cash provided by (used in) financing activities	277,419	(29,117)
Increase in cash and cash equivalents	388,624	34,101
Cash and cash equivalents at beginning of period	227,146	197,043
Cash and cash equivalents at end of period	$ 615,770	$ 231,144