Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Cash flows from operating activities:
Net income	$ 12,969	$ 28,799
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,854	10,783
Stock-based compensation	3,766	2,782
Net loss on disposals and impairments of assets	1	177
Excess tax benefits from stock-based compensation	(26)	(858)
Deferred income taxes	1,622	(3,415)
Changes in operating assets and liabilities:
Accounts receivable	8,816	1,780
Inventories	5,633	(2,469)
Income taxes	16,558	15,453
Prepaid expenses and other assets	(1,272)	(1,661)
Accounts payable	(495)	7,458
Customer prepayments	(20,537)	(2,591)
Accrued compensation and benefits	10,677	(8,977)
Other taxes and withholding	7,493	(58)
Warranty liabilities	(261)	900
Other accruals and liabilities	5,183	761
Net Cash Provided by (Used in) Operating Activities	63,981	48,864
Cash flows from investing activities:
Proceeds from marketable debt securities	15,090	16,244
Purchases of property and equipment	(12,289)	(17,796)
Proceeds from sales of property and equipment	14	33
Investments in marketable debt securities	0	(18,195)
Net cash used in investing activities	2,815	(19,714)
Repurchases of common stock
Repurchases of common stock	(51,240)	(20,475)
Net decrease in short-term borrowings	(6,661)	(16,530)
Proceeds from issuance of common stock	6	1,353
Excess tax benefits from stock-based compensation	26	858
Debt issuance costs	(401)	0
Net cash used in financing activities	(58,270)	(34,794)
Cash and cash equivalents, at beginning of period	8,526	(5,644)
Cash and cash equivalents, at end of period	20,994	51,995
Cash and cash equivalents, at end of period	$ 29,520	$ 46,351