CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Unaudited) [Abstract]
NET SALES	$ 533,366	$ 468,941	$ 1,584,170	$ 1,400,313
COST OF GOODS SOLD	478,139	414,583	1,403,530	1,247,954
GROSS PROFIT	55,227	54,358	180,640	152,359
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	45,186	44,013	140,070	135,829
CANADIAN ANTI-DUMPING DUTY ASSESSMENT	2,000	0	2,000	0
NET (GAIN) LOSS ON DISPOSITION OF ASSETS, EARLY RETIREMENT, AND OTHER IMPAIRMENT AND EXIT CHARGES	(269)	207	(7,052)	3,696
EARNINGS FROM OPERATIONS	8,310	10,138	45,622	12,834
INTEREST EXPENSE	968	926	3,219	2,738
INTEREST INCOME	(302)	(69)	(864)	(449)
EQUITY IN EARNINGS OF INVESTEE	(15)	(17)	(25)	(52)
NON-OPERATING (INCOME) EXPENSE	651	840	2,330	2,237
EARNINGS BEFORE INCOME TAXES	7,659	9,298	43,292	10,597
INCOME TAXES	2,903	3,293	16,140	3,508
NET EARNINGS	4,756	6,005	27,152	7,089
LESS NET EARNINGS ATTRIBUTABLE TO NONCONTROLLING INTEREST	(558)	(389)	(1,290)	(866)
NET EARNINGS ATTRIBUTABLE TO CONTROLLING INTEREST	4,198	5,616	25,862	6,223
EARNINGS PER SHARE - BASIC (in dollars per share)	$ 0.21	$ 0.29	$ 1.31	$ 0.32
EARNINGS PER SHARE - DILUTED (in dollars per share)	$ 0.21	$ 0.29	$ 1.31	$ 0.32
COMPREHENSIVE INCOME	6,269	4,491	28,490	6,496
LESS COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(956)	130	(1,674)	(594)
COMPREHENSIVE INCOME ATTRIBUTABLE TO CONTROLLING INTEREST	$ 5,313	$ 4,621	$ 26,816	$ 5,902