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Debt (Lines-Of-Credit and Notes Payable, Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2016
Debt Instrument [Line Items]            
Proceeds from borrowings under line-of-credit facilities and notes payable     $ 20,386,000 $ 50,042,000    
Availablility of line of credits/credit facilities   $ 131,200,000 131,200,000      
2013 Notes Payable [Member]            
Debt Instrument [Line Items]            
Written off unamortized debt issuance costs   400,000        
Non-revolving term loan         $ 28,125,000  
NBA Eilan Loan [Member]            
Debt Instrument [Line Items]            
Non-revolving term loan   19,974,000 19,974,000   25,603,000  
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 100,000,000
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member] | Term Loans [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 100,000,000          
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Current borrowing capacity 125,000,000          
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity 225,000,000          
Line of credit, outstanding $ 30,000,000          
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 2.00%          
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 2.50%          
Fifth Third Syndicated LOC [Member]            
Debt Instrument [Line Items]            
Non-revolving term loan   $ 75,000,000 $ 75,000,000   $ 55,000,000  
Fifth Third Syndicated LOC [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Repayment of credit facility $ 3,600,000