Consolidated Statements of Equity (USD $) In Thousands		Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Jan. 01, 2011		$ 218	$ 150,548	$ (23,546)	$ 21,241	$ 304,056	$ 143	$ 452,660
Net income for the year						87,024		87,024
Change in net unrealized gain on derivatives*	[1]
Pension liability adjustments	[1]				(6,703)			(6,703)
Unrealized gain on investments	[1]				(2,702)			(2,702)
Foreign currency translation adjustments					(3,205)			(3,205)
Comprehensive income								74,414
Stock-based compensation			5,805					5,805
Withheld shares on restricted stock grants for withholding taxes				(1,203)				(1,203)
Purchase of 859,029 shares of common stock		(9)	(2,998)	(34,085)				(37,092)
Stock options exercised, including tax impact		7	21,020					21,027
Cash dividends paid						(14,508)		(14,508)
Balance at Dec. 31, 2011		216	174,375	(58,834)	8,631	376,572	143	501,103
Net income for the year						75,332		75,332
Pension liability adjustments	[1]				(7,301)			(7,301)	[2]
Unrealized gain on investments	[1]				1,225			1,225	[3]
Foreign currency translation adjustments					13,993			13,993
Comprehensive income								83,249
Stock-based compensation			7,348					7,348
Withheld shares on restricted stock grants for withholding taxes				(1,662)				(1,662)
Stock options exercised, including tax impact		4	14,080					14,084
Cash dividends paid						(16,564)		(16,564)
Balance at Dec. 29, 2012		220	195,803	(60,496)	16,548	435,340	143	587,558
Net income for the year						88,784		88,784
Pension liability adjustments	[1]				3,739			3,739	[2]
Unrealized gain on investments	[1]				1,526			1,526	[3]
Foreign currency translation adjustments					(1,396)			(1,396)
Comprehensive income								92,653
Stock-based compensation			8,609					8,609
Withheld shares on restricted stock grants for withholding taxes				(2,200)				(2,200)
Retirement of 1,576,757 shares of treasury shares				60,343		(60,343)
Stock options exercised, including tax impact		5	19,013					19,018
Cash dividends paid						(18,722)		(18,722)
Balance at Dec. 28, 2013		$ 225	$ 223,425	$ (2,353)	$ 20,417	$ 445,059	$ 143	$ 686,916

[1] Including related tax impact (see Note 14).

[2] Net of tax of $6,253, $11,819, and $7,186 for 2013, 2012 and 2011, respectively.

[3] Net of tax of $0, $0 and $0 for 2013, 2012 and 2011, respectively.