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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Operating Activities    
Net income $ 9,550 $ 68,446
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation of property and equipment 12,675 11,781
Amortization of other intangible assets and other assets 29,891 33,322
Amortization of debt discount and debt issuance costs 10,031 9,578
Stock-based compensation expense 40,042 36,893
Deferred income taxes 24,531 (2,994)
Changes in operating assets and liabilities:    
Accounts receivable (2,975) 2,518
Inventories 3,512 5,066
Prepaid expenses and other assets 23,401 6,349
Accounts payable 6,419 8,675
Other current liabilities and income taxes (15,602) (23,814)
Deferred income, deferred revenue and returns liability (667) (2,816)
Other non-current liabilities (5,957) (7,878)
Net cash provided by operating activities 134,851 145,126
Investing Activities    
Purchases of available-for-sale investments (306,645) (253,973)
Sales and maturities of available-for-sale investments 268,140 371,885
Purchases of property and equipment (12,773) (18,267)
Purchases of other assets (7,132) (9,088)
Acquisition of business, net of cash acquired   (239,729)
Net cash used in investing activities (58,410) (149,172)
Financing Activities    
Payment of debt issuance costs (1,127)  
Repurchases of common stock (26,716) (24,272)
Payment of taxes withheld for vested stock awards (15,693) (18,927)
Proceeds from the issuance of common stock 7,108 6,585
Payment of acquisition-related contingent consideration   (3,380)
Net cash used in financing activities (36,428) (39,994)
Increase (decrease) in cash and cash equivalents 40,013 (44,040)
Cash and cash equivalents at beginning of period 197,043 269,366
Cash and cash equivalents at end of period $ 237,056 $ 225,326