Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Aug. 31, 2015	Nov. 30, 2014
Allowance for receivables	$ 1,000	$ 1,000
Property and Equipment, accumulated depreciation	$ 840,889	$ 818,084
Class A Common Stock $.01 Par Value
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	80,000,000	80,000,000
Common Stock, shares issued (in shares)	26,343,551	26,248,081
Common Stock, shares outstanding (in shares)	26,343,551	26,248,081
Class B Common Stock $.01 Par Value
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	40,000,000	40,000,000
Common Stock, shares issued (in shares)	19,946,636	19,967,202
Common Stock, shares outstanding (in shares)	19,946,636	19,967,202