Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Mar. 30, 2014 Wafer purchase commitment [Member]	Dec. 29, 2013 Wafer purchase commitment [Member]	Mar. 30, 2014 Other goods and services [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases			$ 5,800	$ 10,800	$ 830
Total rent expense, net of sublease income	$ 231	$ 233