Significant Accounting Policies (Aggregate Accrued Warranty Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Significant Accounting Policies [Abstract]
Accrued Warranty Costs - Beginning of Year	$ 1,998	$ 1,936	$ 1,823
Warranty costs paid	(391)	(735)	(592)
Warranty costs accrued	423	423	375
Impact of changes in estimates and assumptions	(138)	374	330
Accrued Warranty Costs - End of Year	$ 1,892	$ 1,998	$ 1,936