Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Shareholders' Equity
Treasury stock, shares	7,580	7,324
Class A [Member]
Shareholders' Equity
Common stock, par value	1	1
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	18,713	18,439
Common stock, shares outstanding	11,133	11,115
Class B [Member]
Shareholders' Equity
Common stock, par value	1	1
Common stock, shares authorized	4,000	4,000
Common stock, shares issued	1,805	1,805
Common stock, shares outstanding	1,805	1,805