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Subsequent Events (Textual) (Details)
 3 Months Ended 6 Months Ended
Jul. 18, 2017
USD ($)
a
Jun. 30, 2017
USD ($)
a
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
a
Jun. 30, 2016
USD ($)
Subsequent Event [Line Items]          
Net gain (loss) on disposition of real estate   $ 1,088,000 $ (727,000) $ 8,411,000 $ 114,729,000
Land [Member]          
Subsequent Event [Line Items]          
Acreage of land | a   14.9   14.9  
Sales Price   $ 16,400,000   $ 16,400,000  
Net gain (loss) on disposition of real estate       $ 0  
Subsequent Event [Member] | Land [Member] | Bishops Gate [Member]          
Subsequent Event [Line Items]          
Acreage of land | a 50        
Sales Price $ 6,000,000        
Net gain (loss) on disposition of real estate $ 0