Accumulated Other Comprehensive Income and Shareholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			$ 1,715,000
Year-to date change	(831,000)	145,000	46,000	1,228,000
Balance at June 30, 2012	1,761,000		1,761,000
Treasury Stock [Abstract]
Stock repurchase program, remaining authorized repurchase amount			129,600,000
Cash dividends per common share	$ 0.24	$ 0.23	$ 0.47	$ 0.46
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			1,715,000
Year-to date change			46,000
Balance at June 30, 2012	1,761,000		1,761,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			5,211,000
Year-to date change			218,000
Balance at June 30, 2012	5,429,000		5,429,000
Unrealized Gains on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			143,000
Year-to date change			52,000
Balance at June 30, 2012	195,000		195,000
Pension Postretirement Liability [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			(3,583,000)
Year-to date change			161,000
Balance at June 30, 2012	(3,422,000)		(3,422,000)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at December 31, 2011			(56,000)
Year-to date change			(385,000)
Balance at June 30, 2012	(441,000)		(441,000)
Common Stock [Member]
Treasury Stock [Abstract]
Repurchased common stock, shares			264,000
Repurchased common stock, value			$ 6,200,000