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Investment in Unconsolidated Joint Venture (Details Textual)
$ in Thousands
Dec. 05, 2016
USD ($)
Jun. 30, 2019
ft²
Dec. 31, 2018
The Loan [Member]      
Schedule of Equity Method Investments [Line Items]      
Debt Instrument,Prepayment Premium 1.00%    
Debt Instrument, Face Amount $ 42,500    
Debt Instrument, Term 10 years    
Debt Instrument, Interest Rate, Effective Percentage   4.56% 4.66%
The Berkley [Member]      
Schedule of Equity Method Investments [Line Items]      
Purchase Price Of Property $ 68,885    
Equity Method Investment, Ownership Percentage   50.00% 50.00%
Area of Land | ft²   99,000