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Basis of Presentation (Textual) (Details)
 3 Months Ended
Mar. 15, 2017
USD ($)
ft²
Mar. 31, 2018
USD ($)
a
Parcel
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 28, 2017
USD ($)
a
Jan. 30, 2017
USD ($)
a
Basis Of Presentation [Line Items]              
Income tax provision   $ 138,000   $ 100,000      
Increase in operating cash flows   12,911,000   10,626,000      
Lease agreement variable income   0          
Contract assets outstanding   0          
Contract liabilities outstanding   0          
Proceeds from the sale of properties   14,921,000   74,159,000      
Assets held for sale, net   0 $ 392,000        
Gain (Loss) on Sale   $ 0   7,323,000      
Garza Land Sale [Member]              
Basis Of Presentation [Line Items]              
Number of Parcels | Parcel   3          
Infrastructure improvements to land, estimated cost   $ 13,200,000          
Total infrastructure costs incurred   $ 7,600,000          
Garza Land Sale [Member] | Parcel One [Member]              
Basis Of Presentation [Line Items]              
Area of land sold | a           8.4  
Sales Price           $ 11,800,000  
Garza Land Sale [Member] | Parcel Two [Member]              
Basis Of Presentation [Line Items]              
Area of land sold | a             1.7
Sales Price             $ 3,500,000
Garza Land Sale [Member] | Parcel Three [Member]              
Basis Of Presentation [Line Items]              
Area of land sold | a   6.6          
Sales Price   $ 14,600,000          
Philadelphia Marine Center (Marine Piers) [Member]              
Basis Of Presentation [Line Items]              
Sales Price $ 21,400,000            
Rentable Square Feet | ft² 181,900            
Payment by cash on purchases $ 12,000,000            
Balance payment on purchases $ 9,400,000            
Date of second installment payment Jan. 31, 2020            
Proceeds from the sale of properties $ 11,200,000            
Assets held for sale, net 4,700,000            
Gain (Loss) on Sale 6,500,000            
Deferred gain on sale $ 9,400,000            
ASU 2016-18 [Member]              
Basis Of Presentation [Line Items]              
Restricted cash   $ 800,000   33,000,000      
Increase in operating cash flows       300,000      
Increase in investing cash flows       32,000,000      
General and Administrative Expenses [Member]              
Basis Of Presentation [Line Items]              
Income tax provision       100,000      
Net Income Tax Provision [Member]              
Basis Of Presentation [Line Items]              
Reclassification of net income tax provision out of general and administrative expenses into net income tax provision     $ 100,000 $ 100,000      
Impairment Charges [Member]              
Basis Of Presentation [Line Items]              
Out-of-period error immaterial in current year         $ 1,200,000