Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Aug. 31, 2012	Nov. 30, 2011
Allowance for receivables	$ 1,000	$ 1,000
Property and Equipment, accumulated depreciation	$ 686,224	$ 647,905
Class A Common Stock $.01 Par Value
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	80,000,000	80,000,000
Common Stock, shares issued	26,060,992	26,352,759
Common Stock, shares outstanding	26,060,992	26,352,759
Class B Common Stock $.01 Par Value
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	40,000,000	40,000,000
Common Stock, shares issued	20,070,916	20,145,871
Common Stock, shares outstanding	20,070,916	20,145,871