Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Aug. 31, 2013	Nov. 30, 2012
Allowance for receivables	$ 1,000	$ 1,000
Property and Equipment, accumulated depreciation	$ 757,004	$ 701,054
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 outstanding	26,170,321	26,081,558
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 outstanding	19,996,371	20,050,277