Shareholders' Equity (Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Ending Balance	$ 1,313	$ 1,715	$ 1,659
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	5,211	4,415	3,526
Changes during the year	264	796	889
Less: Taxes	0	0	0
Ending Balance	5,475	5,211	4,415
Unrealized Gains (Losses) on Marketable Securities [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	143	(48)	0
Changes during the year	95	294	(74)
Less: Taxes	33	103	(26)
Ending Balance	205	143	(48)
Pension Postretirement Liability [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(3,583)	(2,313)	(2,710)
Changes during the year	(1,132)	(2,035)	636
Less: Taxes	(424)	(765)	239
Ending Balance	(4,291)	(3,583)	(2,313)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(56)	(395)	(1,590)
Changes during the year	(30)	543	1,915
Less: Taxes	(10)	204	720
Ending Balance	(76)	(56)	(395)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	1,715	1,659	(774)
Changes during the year	(803)	(402)	3,366
Less: Taxes	(401)	(458)	933
Ending Balance	$ 1,313	$ 1,715	$ 1,659