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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Statement of Cash Flows [Abstract]    
Net Cash Provided by (Used in) Investing Activities $ (34,427) $ (29,580)
Cash flows from operating activities:    
Net income 49,286 40,130
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 46,000 42,555
Stock-based compensation 11,809 9,272
Net loss on disposals and impairments of assets 229 9
Excess tax benefits from stock-based compensation 0 (516)
Deferred income taxes 3,729 (673)
Changes in operating assets and liabilities:    
Accounts receivable (1,402) 5,271
Inventories (4,191) 15,991
Income taxes (147) 30,386
Prepaid expenses and other assets (1,713) (3,458)
Accounts payable 33,325 (1,043)
Customer prepayments 13,722 (23,125)
Accrued compensation and benefits 15,277 12,441
Other taxes and withholding 758 7,494
Other accruals and liabilities 9,372 10,527
Net cash provided by operating activities 176,054 145,261
Cash flows from investing activities:    
Purchases of property and equipment (37,613) (38,769)
Decrease in restricted cash 3,150 0
Proceeds from sales of property and equipment 36 67
Proceeds from marketable debt securities 0 15,090
Investments in marketable debt securities 0 5,968
Cash flows from financing activities:    
Repurchases of common stock (120,158) (96,410)
Net (decrease) increase in short-term borrowings (6,194) 3,062
Proceeds from issuance of common stock 3,040 1,949
Debt issuance costs (10) (409)
Excess tax benefits from stock-based compensation 0 516
Net cash used in financing activities (123,322) (91,292)
Net increase in cash and cash equivalents 18,305 24,389
Cash and cash equivalents, at beginning of period 11,609 20,994
Cash and cash equivalents, at end of period $ 29,914 $ 45,383