Inventories (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010
Inventories [Abstract]
Raw materials and supplies	$ 42,281,000	$ 47,737,000
Work-in-process	38,420,000	34,784,000
Finished goods	143,648,000	131,921,000
Valuation reserves	(5,156,000)	(4,550,000)
Inventories	219,193,000	209,892,000
Inventories valued using the LIFO method	15,100,000	21,200,000
FIFO cost of inventories	101,200,000	126,800,000
Average cost basis inventories	44,900,000	36,400,000
Deferred LIFO Gain	8,000,000
FIFO value of inventory consigned to others	$ 2,900,000	$ 2,600,000