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Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule IV - Mortgage Loans on Real Estate [Line Items]        
Basis Spread on Variable Rate Loan 1.00%      
Federal Income Tax Basis $ 13,161      
Face Amount of Mortgage Loans 21,395      
Carrying amount of mortgages $ 13,161 $ 3,395 $ 3,395 $ 3,395
Interest Rate on Mortgage Loans 4.10% 4.30%    
Undeveloped Land, First Lien Note [Member]        
Schedule IV - Mortgage Loans on Real Estate [Line Items]        
Final Maturity Date Jul. 01, 2019      
Face Amount of Mortgage Loans $ 3,395      
Carrying amount of mortgages 3,395      
Parking Garage, Developer Advances [Member]        
Schedule IV - Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgage Loans 18,000      
Carrying amount of mortgages $ 9,766      
Minimum [Member] | Parking Garage, Developer Advances [Member]        
Schedule IV - Mortgage Loans on Real Estate [Line Items]        
Interest Rate on Mortgage Loans 4.00%      
Maximum [Member] | Parking Garage, Developer Advances [Member]        
Schedule IV - Mortgage Loans on Real Estate [Line Items]        
Interest Rate on Mortgage Loans 7.00%