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Fair Values (Schedule of Fair Value Measurement) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Recurring basis | Fair Value    
Assets and liabilities recorded at fair value    
Derivative assets   $ 10,303
Available-for-sale securities $ 22,842 21,282
Recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Derivative assets   0
Available-for-sale securities 0 0
Recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities recorded at fair value    
Derivative assets   10,303
Recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Available-for-sale securities 22,842 $ 21,282
Non-recurring basis | Fair Value    
Assets and liabilities recorded at fair value    
Impaired real estate 12,400  
Impaired real estate available and held for sale 800  
Impaired land and development 21,400  
Non-recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Impaired real estate available and held for sale 0  
Impaired land and development 0  
Non-recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities recorded at fair value    
Impaired land and development 0  
Non-recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Impaired real estate 12,400  
Impaired real estate available and held for sale 800  
Impaired land and development $ 21,400  
Non-recurring basis | Significant unobservable inputs (Level 3) | Discount Rate    
Assets and liabilities recorded at fair value    
Land and development asset, measurement input 0.06  
Non-recurring basis | Significant unobservable inputs (Level 3) | Holding Period    
Assets and liabilities recorded at fair value    
Land and development asset, measurement input, term 10 years  
Non-recurring basis | Significant unobservable inputs (Level 3) | Fair Value    
Assets and liabilities recorded at fair value    
Impaired real estate $ 12,400  
Impaired land and development $ 21,400