CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Net income (loss)	$ 1,078	$ 36,766	$ (41,394)	$ 39,387
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(670)	462	(440)	(8)
Gain (loss) on investments	(308)	52	(333)	11
Other comprehensive income (loss) before tax	(978)	514	(773)	3
Income tax expense (benefit) related to items of other comprehensive income (loss)	(7)	17	(12)	5
Other comprehensive income (loss), net of tax	(971)	497	(761)	(2)
Comprehensive income (loss)	$ 107	$ 37,263	$ (42,155)	$ 39,385