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Debt (Lines-Of-Credit and Notes Payable, Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Apr. 17, 2018
Sep. 30, 2018
Sep. 30, 2017
[1]
Dec. 31, 2017
Debt Instrument [Line Items]        
Proceeds from borrowings collaterized by line-of-credit facilities and notes payable   $ 50,042 $ 30,000  
Availablility of line of credits/credit facilities   122,800    
NBA Line Of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   20,000    
Non-revolving term loan       $ 5,089
NBA Eilan Loan [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 27,500      
Proceeds from borrowings collaterized by line-of-credit facilities and notes payable 24,300      
Availablility of line of credits/credit facilities $ 3,200      
Non-revolving term loan   $ 24,258    
Line of credit, advance period   12 months    
NBA Eilan Loan [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Effective rate 4.75%      
NBA Eilan Loan [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on rate 3.25%      
NBA Receivables Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 70,000    
Basis spread on rate   2.75%    
NBA Receivables Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Effective rate   3.50%    
The Eilan Hotel And Spa [Member]        
Debt Instrument [Line Items]        
Purchase consideration $ 34,300      
[1] * See Note 2 for summary of adjustments.