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Fair Values (Schedule of Fair Value Measurement) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Assets and liabilities recorded at fair value      
Preferred equity security, face value $ 100,000 $ 100,000  
Preferred equity security, mandatory redemption period 5 years    
Recurring basis | Quoted market prices in active markets (Level 1)      
Assets and liabilities recorded at fair value      
Derivative assets $ 0 0  
Derivative liabilities 0 0  
Available-for-sale securities 0 0 $ 0
Recurring basis | Significant other observable inputs (Level 2)      
Assets and liabilities recorded at fair value      
Derivative assets 8,120 8,120  
Derivative liabilities 1,150 1,150  
Recurring basis | Significant unobservable inputs (Level 3)      
Assets and liabilities recorded at fair value      
Available-for-sale securities 21,840 21,840 22,842
Non-recurring basis | Quoted market prices in active markets (Level 1)      
Assets and liabilities recorded at fair value      
Impaired real estate 0 0  
Impaired real estate available and held for sale     0
Impaired land and development 0 0 0
Non-recurring basis | Significant other observable inputs (Level 2)      
Assets and liabilities recorded at fair value      
Impaired land and development 0 0 0
Non-recurring basis | Significant unobservable inputs (Level 3)      
Assets and liabilities recorded at fair value      
Impaired real estate 5,632 5,632 12,400
Impaired real estate available and held for sale     800
Impaired land and development 8,873 8,873 21,400
Debt security 77,007 77,007  
Preferred equity security, fair value 77,000 77,000  
Fair Value | Recurring basis      
Assets and liabilities recorded at fair value      
Derivative assets 8,120 8,120  
Derivative liabilities 1,150 1,150  
Available-for-sale securities 21,840 21,840 22,842
Fair Value | Non-recurring basis      
Assets and liabilities recorded at fair value      
Impaired real estate 5,632 5,632 12,400
Impaired real estate available and held for sale     800
Impaired land and development $ 8,873 $ 8,873 $ 21,400
Loans Receivable and Other Lending Investments, Net [Member] | Fair Value | Non-recurring basis      
Assets and liabilities recorded at fair value      
Discount rate   7.375%  
Land and Land Development Asset | Fair Value | Non-recurring basis      
Assets and liabilities recorded at fair value      
Discount rate     6.00%
Estimated sales period     10 years