CONSOLIDATED CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 26, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 0	$ 11,305	$ 0
Accounts receivable, net	192,427	127,316	176,970
Inventories:
Raw materials	121,595	111,526	146,435
Finished goods	96,958	83,171	97,204
Inventory, net	218,553	194,697	243,639
Assets held for sale	0	0	7,528
Refundable income taxes	2,091	3,482	3,379
Other current assets	21,661	21,394	24,526
TOTAL CURRENT ASSETS	434,732	358,194	456,042
OTHER ASSETS	15,712	15,380	11,698
GOODWILL	154,702	154,702	154,702
INDEFINITE-LIVED INTANGIBLE ASSETS	2,340	2,340	2,340
OTHER INTANGIBLE ASSETS, net	10,200	10,924	14,492
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment	540,223	537,208	516,588
Accumulated depreciation and amortization	(318,519)	(314,741)	(299,786)
PROPERTY, PLANT AND EQUIPMENT, NET	221,704	222,467	216,802
TOTAL ASSETS	839,390	764,007	856,076
CURRENT LIABILITIES:
CASH OVERDRAFT	4,282	0	41
Accounts payable	75,347	49,433	66,571
Accrued liabilities:
Compensation and benefits	32,666	30,920	34,821
Other	15,075	12,172	14,606
Current portion of long-term debt and capital lease obligations	42,774	40,270	74,647
TOTAL CURRENT LIABILITIES	170,144	132,795	190,686
LONG-TERM DEBT AND CAPITAL LEASE OBLIGATIONS, less current portion	43,668	12,200	52,474
DEFERRED INCOME TAXES	19,008	19,049	20,506
OTHER LIABILITIES	16,104	17,364	12,512
TOTAL LIABILITIES	248,924	181,408	276,178
Controlling interest shareholders' equity:
Common stock, no par value; shares authorized 40,000,000;issued and outstanding 19,715,647, 19,623,803 and 19,524,953	19,716	19,624	19,525
Additional paid-in capital	146,523	143,988	140,083
Retained earnings	415,003	410,848	410,438
Accumulated other comprehensive earnings	4,234	3,600	4,704
Employee stock notes receivable	(1,080)	(1,255)	(1,493)
Controlling interest shareholders' equity	584,396	576,805	573,257
Noncontrolling interest	6,070	5,794	6,641
TOTAL EQUITY	590,466	582,599	579,898
TOTAL LIABILITIES AND EQUITY	$ 839,390	$ 764,007	$ 856,076