Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Document Period End Date	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 20,548	$ 24,461
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,680	16,205
Stock-based compensation	3,084	3,704
Net gain on disposals and impairments of assets	(70)	0
Deferred income taxes	1,184	5,663
Changes in operating assets and liabilities:
Accounts receivable	(2,486)	1,478
Inventories	(2,485)	8,168
Income taxes	4,762	5,541
Prepaid expenses and other assets	13,894	2,880
Accounts payable	123	(1,394)
Customer prepayments	2,412	4,443
Accrued compensation and benefits	(7,567)	11,693
Other taxes and withholding	1,662	(903)
Other accruals and liabilities	(1,485)	4,930
Net cash provided by operating activities	49,256	86,869
Cash flows from investing activities:
Purchases of property and equipment	(8,805)	(13,211)
Proceeds from sales of property and equipment	70	0
Net cash used in investing activities	(8,735)	(13,211)
Cash flows from financing activities:
Repurchases of common stock	(77,648)	(54,794)
Net increase in short-term borrowings	35,963	2,369
Proceeds from issuance of common stock	857	460
Debt issuance costs	(1,009)	0
Net cash used in financing activities	(41,837)	(51,965)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1,316)	21,693
Cash, cash equivalents and restricted cash, at beginning of period	3,651	14,759
Cash, cash equivalents and restricted cash, at end of period	$ 2,335	$ 36,452