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Consolidated Balance Sheets (Parenthetical) (USD $)
Nov. 30, 2014
Nov. 30, 2013
Stockholders' Equity:    
Class A common stock, par value per share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Class A common stock, shares authorized 160,000,000us-gaap_CommonStockSharesAuthorized 160,000,000us-gaap_CommonStockSharesAuthorized
Class A common stock, shares issued 69,391,577us-gaap_CommonStockSharesIssued 67,901,101us-gaap_CommonStockSharesIssued
Class A common stock, shares outstanding 68,372,176us-gaap_CommonStockSharesOutstanding 67,382,298us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 1,019,401us-gaap_TreasuryStockShares 518,803us-gaap_TreasuryStockShares