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DEBT - Narrative (Details)
9 Months Ended 12 Months Ended
Oct. 08, 2019
USD ($)
Apr. 24, 2019
USD ($)
Property
Apr. 11, 2019
USD ($)
Mar. 19, 2019
USD ($)
Property
Jan. 31, 2019
May 16, 2018
USD ($)
Apr. 02, 2018
USD ($)
Loan
Property
Feb. 15, 2018
USD ($)
Sep. 26, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2019
USD ($)
Property
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 20, 2019
Property
Dec. 06, 2018
USD ($)
Jan. 15, 2016
USD ($)
Debt Instrument [Line Items]                                  
Weighted average interest rate for all borrowings, after giving effect to interest rate derivatives (as a percent)                     4.03%   4.27%        
Long-term debt                     $ 843,531,000   $ 958,712,000        
Repayments of debt                     251,360,000 $ 369,147,000          
Debt transaction costs                     $ 1,847,000 $ 265,000          
Mortgage loans                                  
Debt Instrument [Line Items]                                  
Debt principal amount defeased       $ 6,300,000                          
Secured debt | Non-recourse Loan | Metabank                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                   $ 47,600,000              
Number of properties that served as collateral for loans | Property                     3            
Amount drawn on secured debt                           $ 47,600,000      
Fixed interest rate                   4.44%              
Debt instrument, interest only payments term         24 months         18 months              
Debt instrument, amortization period after interest only payments period                     25 years            
Secured debt | Mortgage loans                                  
Debt Instrument [Line Items]                                  
Number of properties that served as collateral for loans | Property       4             15       3    
Long-term debt       $ 26,200,000             $ 158,700,000            
Secured debt | Mortgage loans | Compass Bank                                  
Debt Instrument [Line Items]                                  
Number of properties that served as collateral for loans | Property   3                              
Repayments of debt   $ 21,900,000                              
Secured debt | Mortgage loans | U.S. Bank                                  
Debt Instrument [Line Items]                                  
Repayments of debt     $ 10,600,000                            
Debt transaction costs     $ 1,000,000.0                            
Secured debt | Mortgage loans | Western Alliance Bank                                  
Debt Instrument [Line Items]                                  
Debt instrument, effective interest rate             5.39%                    
Number of properties that served as collateral for loans | Property             4                    
Repayments of debt             $ 23,900,000                    
Number of debt instrument | Loan             4                    
Unsecured debt | 2018 Unsecured Credit Facility                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum borrowing capacity                     600,000,000.0         $ 600,000,000.0  
Line of credit amount borrowed                     240,000,000.0            
Amount available for borrowing                     350,000,000.0            
Maximum increase in borrowing capacity available through accordion feature option                     $ 300,000,000.0            
Number of properties that served as collateral for loans | Property                     54            
Unsecured debt | $400 Million Revolver                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum borrowing capacity                               400,000,000.0  
Unsecured debt | $200 Million Term Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                               $ 200,000,000.0  
Debt instrument, effective interest rate                     3.52%            
Unsecured debt | $450 Million Senior Unsecured Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 450,000,000.0
Unsecured debt | $300 Million Revolver                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 300,000,000.0
Unsecured debt | $150 Million Term Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 150,000,000.0
Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                 $ 225,000,000.0                
Maximum increase in borrowing capacity available through accordion feature option                 $ 175,000,000.0                
Debt instrument, effective interest rate                     3.62%            
Amount drawn on unsecured debt                           $ 225,000,000.0      
Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount               $ 225,000,000.0                  
Maximum increase in borrowing capacity available through accordion feature option               150,000,000.0                  
Debt instrument, effective interest rate                     3.87%            
Amount drawn on unsecured debt           $ 85,000,000.0   140,000,000.0                  
Unsecured debt | Term Loan terminated Feb 15, 2018                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount               $ 140,000,000.0                  
Mortgage loans                                  
Debt Instrument [Line Items]                                  
Debt transaction costs       $ 600,000                          
Minimum | LIBOR | Unsecured debt | $400 Million Revolver                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                     1.40%            
Minimum | LIBOR | Unsecured debt | $200 Million Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                     1.35%            
Maximum | LIBOR | Unsecured debt | $400 Million Revolver                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                     2.15%            
Maximum | LIBOR | Unsecured debt | $200 Million Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                     2.10%            
Option One | Minimum | LIBOR | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 1.45%                
Option One | Minimum | LIBOR | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               1.80%                  
Option One | Maximum | LIBOR | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 2.20%                
Option One | Maximum | LIBOR | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               2.55%                  
Option Two | LIBOR | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 1.00%                
Option Two | LIBOR | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               1.00%                  
Option Two | Federal Funds Rate | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 0.50%                
Option Two | Federal Funds Rate | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               0.50%                  
Option Two | Minimum | Base rate | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 0.45%                
Option Two | Minimum | Base rate | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               0.80%                  
Option Two | Maximum | Base rate | Unsecured debt | 2017 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate                 1.20%                
Option Two | Maximum | Base rate | Unsecured debt | 2018 Term Loan                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate               1.55%                  
Fair Value                                  
Debt Instrument [Line Items]                                  
Debt with variable interest rates that had been converted to fixed interest rates                     $ 400,000,000.0   $ 400,000,000        
Subsequent Event | $75 Million Term Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount $ 75,000,000                                
Difference of debt basis spread on variable rate 0.05%                                
Subsequent Event | Line of Credit | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum borrowing capacity $ 500,000,000                                
Maximum increase in borrowing capacity available through accordion feature option 300,000,000                                
Credit facility, current borrowing capacity $ 200,000,000                                
Subsequent Event | Line of Credit | Option One | LIBOR | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate 2.15%                                
Subsequent Event | Line of Credit | Option Two | LIBOR | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate 2.15%                                
Subsequent Event | Line of Credit | Option Three | LIBOR | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate 1.00%                                
Subsequent Event | Line of Credit | Option Three | Federal Funds Rate | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate 0.50%                                
Subsequent Event | Line of Credit | Option Three | Base rate | $200 Million Credit Facility                                  
Debt Instrument [Line Items]                                  
Debt basis spread on variable rate 1.15%                                
Subsequent Event | Revolving Credit Facility | $125 Million Revolver                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum borrowing capacity $ 125,000,000