Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Cash flows from operating activities:
Net loss	$ (3,924)	$ (7,721)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	30,058	33,278
Stock-based compensation	12,804	11,106
Unrealized foreign exchange gain, net	(4,398)	(1,264)
Net amortization of premiums and accrued interest of investments	390	390
Asset impairments	252	770
Gain on investment securities and other investments	(57)	(74)
Accretion of discount on short-term and long-term obligations	390
Amortization of debt issue costs	102	102
Gain on exit of lease agreement	(696)
Changes in operating assets and liabilities:
Accounts receivable, net	(2,727)	(2,249)
Inventories, net	1,784	(311)
Prepaid expenses and other current assets	1,055	3,068
Accounts payable and accrued liabilities	5,163	(2,234)
Deferred taxes and income taxes payable	1,382	6,447
Deferred income	(159)	(2,292)
Net cash provided by operating activities	41,419	39,016
Cash flows from investing activities:
Purchases of property and equipment	(8,850)	(8,054)
Purchase of intangible assets	(3,845)	(733)
Redemption of short-term investments	13,466	3,535
Disposals of investment securities and other investments	29,973	25,538
Purchases of investment securities and other investments	(67,515)	(41,966)
Net cash used in investing activities	(36,771)	(21,680)
Cash flows from financing activities:
Cash paid in connection with business acquisition	(18,000)
Proceeds from credit facility	102,000	30,000
Repayment of credit facility	(65,000)	(60,000)
Proceeds from issuance of common stock	31,342	10,615
Repurchases of common stock	(102,108)	(11,496)
Net cash used in financing activities	(51,766)	(30,881)
Effect of exchange rate changes on cash and cash equivalents	(588)	95
Net decrease in cash and cash equivalents	(47,706)	(13,450)
Cash and cash equivalents, beginning of period	112,570	100,038
Cash and cash equivalents, end of period	64,864	86,588
Supplemental disclosures of cash flow information:
Cash paid for interest	(251)	(206)
Cash (payments) refunds (made) received for income taxes, net	$ (352)	$ 272