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Debt - Additional Information (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Debt default, number of loans | loan 2      
Debt default, amount $ 38,942,000      
Capitalized interest $ 251,000 $ 15,000    
Mortgages and Notes Payable        
Debt Instrument [Line Items]        
Weighted average interest rate 4.60%     4.50%
Mortgages payable $ 378,249,000     $ 575,514,000
6.804% Trust Preferred Securities        
Debt Instrument [Line Items]        
Stated interest rate     6.804%  
Face amount of debt instrument     $ 200,000,000  
Interest rate, effective percentage 3.966%      
Principal amount outstanding $ 129,120,000     129,120,000
Unamortized debt issuance costs $ 1,749,000     $ 1,824,000
6.804% Trust Preferred Securities | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.70%  
Minimum | Mortgages and Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate 3.50%     2.20%
Maximum | Mortgages and Notes Payable        
Debt Instrument [Line Items]        
Stated interest rate 6.50%     6.50%