Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 25, 2011	Dec. 26, 2010
Accounts receivable, allowance for doubtful accounts	$ 4,903	$ 5,003
Cumulative Convertible [Member]
Preferred stock, par value	$ 5	$ 5
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	22,548,741	22,493,878
Class B Common Stock [Member]
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	600,000	600,000
Common stock, shares issued	548,564	548,564