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Investments in Unconsolidated Joint Ventures (Details 1) (USD $)
In Thousands, unless otherwise specified
May 31, 2012
Joint_Venture
Nov. 30, 2011
Joint_Venture
Information related investments in unconsolidated joint ventures    
Number of investments in unconsolidated joint ventures 8 8
Investments in unconsolidated joint ventures $ 121,408 $ 127,926