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Real Estate Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended 9 Months Ended 9 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Aug. 31, 2013
Sep. 01, 2012
Dec. 01, 2012
Aug. 31, 2013
Imperial's Florida farm
Dec. 01, 2012
Imperial's Florida farm
Aug. 31, 2013
Held for Sale
Dec. 01, 2012
Held for Sale
Aug. 31, 2013
Land
Dec. 01, 2012
Land
Sep. 01, 2012
Land
Tradeport Undeveloped land sale
acre
Aug. 31, 2013
Land
Tradeport Undeveloped land sale
Dec. 01, 2012
Land
Tradeport Undeveloped land sale
Aug. 31, 2013
Land
Tradeport Undeveloped land sale
Aug. 31, 2013
Land
Held for Sale
Dec. 01, 2012
Land
Held for Sale
Aug. 31, 2013
Land improvements
Dec. 01, 2012
Land improvements
Aug. 31, 2013
Land improvements
Minimum
Aug. 31, 2013
Land improvements
Maximum
Aug. 31, 2013
Buildings and improvements
Dec. 01, 2012
Buildings and improvements
Aug. 31, 2013
Buildings and improvements
Minimum
Aug. 31, 2013
Buildings and improvements
Maximum
Aug. 31, 2013
Tenant improvements
Dec. 01, 2012
Tenant improvements
Aug. 31, 2013
Development costs
Dec. 01, 2012
Development costs
Aug. 31, 2013
Development costs
Held for Sale
Dec. 01, 2012
Development costs
Held for Sale
Real estate assets                                                              
Estimated Useful Lives                                       10 years 30 years     10 years 40 years            
Real estate assets, gross $ 191,509   $ 191,509   $ 180,671     $ 1,632 $ 1,186 $ 17,385 $ 10,267         $ 170 $ 35 $ 15,367 $ 15,138     $ 127,151 $ 125,971     $ 16,191 $ 14,738 $ 15,415 $ 14,557 $ 1,462 $ 1,151
Accumulated depreciation (60,788)   (60,788)   (56,744)                                                    
Real estate assets, net 130,721   130,721   123,927 1,771 1,921 1,632 1,186                                            
Depreciation expense 1,388 1,269 4,136 3,839                                                      
Capitalized interest   227   596                                                      
Sales                                                              
Number of acres sold                       93                                      
Proceeds from sale of undeveloped land                       7,000                                      
Proceeds from land sale deposited in escrow         6,934             6,929                                      
Revenue from sale of land                         2,474                                    
Pretax gain on land sale                         2,109                                    
Pretax gain from sale of land recognized                           3,942 6,051                                
Revenue from an amended agreement related to land sale                   177     177                                    
Cash received upon completion of the sewer line to service the land                         $ 177