CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Unaudited) (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Earnings [Member]	Employee Stock Notes Receivable [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 25, 2010	$ 19,333	$ 138,573	$ 414,108	$ 4,165	$ (1,670)	$ 6,667	$ 581,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings/loss			(3,670)			258	(3,412)
Foreign currency translation adjustment				539		171	710
Purchase of additional noncontrolling interest						(100)	(100)
Capital contribution from noncontrolling interest						40	40
Distributions to noncontrolling interest						(395)	(395)
Issuance of shares under employee stock plans	25	431					456
Issuance of shares under stock grant programs	164	(24)					140
Issuance of shares under deferred compensation plans	3	(3)					0
Tax benefits from non-qualified stock options exercised		152					152
Expense associated with share-based compensation arrangements		735					735
Accrued expense under deferred compensation plans		231					231
Note receivable adjustment		(12)			12		0
Payments received on employee stock notes receivable					165		165
Balance at Mar. 26, 2011	19,525	140,083	410,438	4,704	(1,493)	6,641	579,898
Balance at Dec. 31, 2011	19,624	143,988	410,848	3,600	(1,255)	5,794	582,599
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings/loss			4,155			231	4,386
Foreign currency translation adjustment				634		424	1,058
Purchase of additional noncontrolling interest							0
Capital contribution from noncontrolling interest							0
Distributions to noncontrolling interest						(379)	(379)
Issuance of shares under employee stock plans	42	994					1,036
Issuance of shares under stock grant programs	25	28					53
Issuance of shares under deferred compensation plans	25	(25)					0
Tax benefits from non-qualified stock options exercised		103					103
Expense associated with share-based compensation arrangements		451					451
Accrued expense under deferred compensation plans		984					984
Payments received on employee stock notes receivable					175		175
Balance at Mar. 31, 2012	$ 19,716	$ 146,523	$ 415,003	$ 4,234	$ (1,080)	$ 6,070	$ 590,466