Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 5,339	$ 15,649
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,682	21,377
Gain on sale of assets		(5,323)
Provision for losses on inventories	3,775	3,790
Stock-based compensation expense	4,145	4,092
Provision for doubtful accounts	166	191
Loss on disposal of property and equipment	432	130
Deferred income taxes	(101)	1,361
Increase (decrease) in cash, net of acquisition, due to changes in:
Accounts and notes receivable	1,636	(3,915)
Inventories	(3,568)	(1,803)
Prepaid expenses and other assets	(3,896)	448
Accounts payable	1,048	703
Accrued payroll and related expenses	342	(6,604)
Accrued expenses and other liabilities	4,290	(1,963)
Other long-term liabilities	(5)	180
Net cash provided by operating activities	29,285	28,313
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(8,340)	(6,186)
Restricted cash	(139)	9,412
Gain on sale of assets		5,323
Business acquisition, net of cash acquired		(8,939)
Purchase of marketable securities	(2,400)	(1,206)
Proceeds from the sale of marketable securities	2,245	1,161
Net cash used in investing activities	(8,634)	(435)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of long-term debt and obligations under capital leases	(19,422)	(14,489)
Proceeds from short-term borrowings	1,683	3,894
Repayment of short-term borrowings	(3,495)	(21,868)
Proceeds from the issuance of common stock under employee plans	4,266	2,403
Tax withholding payments related to net share settlement of equity awards	(1,993)	(3,053)
Net cash used in financing activities	(18,961)	(33,113)
Impact of foreign exchange rate changes on cash balances	(271)	(748)
Net increase (decrease) in cash and cash equivalents	1,419	(5,983)
Cash and cash equivalents at beginning of period	88,767	55,701
Cash and cash equivalents at end of period	90,186	49,718
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	3,354	3,501
Cash paid during the period for income taxes, net	2,113	2,837
Property and equipment accrued in accounts payable	$ 714	$ 138