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Notes Receivable From Real Estate Joint Ventures And Partnerships (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Nov. 30, 2012
Notes Receivable From Real Estate Joint Ventures And Partnerships [Line Items]              
Interest rate on notes receivable - range minimum       2.90%   2.90%  
Interest rate on notes receivable - range maximum       10.00%   16.00%  
Notes receivable due at various dates through       Jun. 30, 2017   Jun. 30, 2014  
Allowance for uncollectible notes receivable   $ 0   $ 0   $ 0  
Interest income on notes receivable   600,000 700,000 1,300,000 1,400,000    
Notes receivable from real estate joint ventures and partnerships, currently due             16,100,000
Proceeds received for notes receivable $ 59,200,000     $ 6,282,000 $ 73,563,000    
Ownership percentage in joint ventures 47.80%         75.00%