Stock-Based Compensation (Schedule of Stock Options Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Number Of Shares
Balance outstanding at beginning of period, in shares	7,242	6,960	7,483
Granted, in shares	428	716	791
Forfeited or expired, in shares	(219)	(269)	(935)
Exercised, in shares	(1,769)	(165)	(379)
Balance outstanding at end of period, in shares	5,682	7,242	6,960
Exercisable, in shares	4,554
Vested and expected to vest, in shares	5,456
Weighted Average Exercise Price
Balance outstanding at beginning of period, in dollars per share	$ 2.62	$ 2.55	$ 2.58
Granted, in dollars per share	$ 3.51	$ 3.26	$ 2.43
Forfeited or expired, in dollars per share	$ 3.56	$ 2.65	$ 3.04
Exercised, in dollars per share	$ 2.57	$ 2.21	$ 1.87
Balance outstanding at end of period, in dollars per share	$ 2.67	$ 2.62	$ 2.55
Exercisable, in dollars per share	$ 2.56
Vested and expected to vest, in dollars per share	$ 2.65
Weighted Average Remaining Term
Balance outstanding	5 years 5 months 19 days
Exercisable	4 years 8 months 9 days
Vested and expected to vest	5 years 3 months 29 days
Aggregate Intrinsic Value
Balance outstanding	$ 3,889
Exercisable	3,616
Vested and expected to vest	$ 3,852