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DEBT - Narrative (Details)
6 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
Feb. 15, 2018
USD ($)
Sep. 26, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2020
USD ($)
Property
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
May 07, 2020
USD ($)
Mar. 20, 2019
Property
Dec. 06, 2018
USD ($)
Debt Instrument [Line Items]                              
Weighted average interest rate for all borrowings, after giving effect to interest rate derivatives (as a percent)                 3.39%   3.95%        
Long-term debt                 $ 1,159,399,000   $ 1,016,163,000        
Repayments of debt                 46,857,000 $ 230,562,000          
Debt transaction costs                 $ 271,000 $ 1,835,000          
$75 Million Term Loan                              
Debt Instrument [Line Items]                              
Debt instrument, face amount $ 75,000,000                            
Difference of basis spread on variable rate 0.05%                            
Mortgage loans                              
Debt Instrument [Line Items]                              
Debt principal amount defeased       $ 6,300,000                      
Secured debt | Non-recourse Loan | Metabank                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity                       $ 300,000,000      
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         $ 155,900,000            
Secured debt | Compass Bank Variable due May 6, 2020                              
Debt Instrument [Line Items]                              
Number of properties that served as collateral for loans | Property   3                          
Repayments of debt   $ 21,900,000                          
Secured debt | U.S. Bank, NA 6.13% Fixed due November 11, 2021                              
Debt Instrument [Line Items]                              
Repayments of debt     $ 10,600,000                        
Debt transaction costs     $ 1,000,000.0                        
Unsecured debt | 2018 Unsecured Credit Facility                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity                             $ 600,000,000.0
Line of credit amount borrowed                 420,000,000.0            
Amount available for borrowing                 100,000,000.0            
Conditional additional borrowing capacity                 $ 50,000,000.0            
Number of properties that served as collateral for loans | Property                 52            
Additional borrowing capacity                 $ 300,000,000.0            
Unsecured debt | $400 Million Revolver                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity                 400,000,000       $ 400,000,000   400,000,000
Unsecured debt | $200 Million Term Loan                              
Debt Instrument [Line Items]                              
Debt instrument, face amount                 $ 200,000,000           $ 200,000,000
Debt instrument, effective interest rate                 2.35%            
Unsecured debt | First Amendment to Credit Agreement                              
Debt Instrument [Line Items]                              
Conditional additional borrowing capacity                         50,000,000    
Additional borrowing capacity                         $ 100,000,000    
Unsecured debt | 2018 Term Loan                              
Debt Instrument [Line Items]                              
Debt instrument, face amount           $ 225,000,000.0                  
Debt instrument, effective interest rate                 2.20%            
Additional borrowing capacity           $ 150,000,000.0                  
Unsecured debt | 2017 Term Loan                              
Debt Instrument [Line Items]                              
Debt instrument, face amount             $ 225,000,000.0                
Debt instrument, effective interest rate                 2.50%            
Additional borrowing capacity             $ 175,000,000.0                
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                 2.20%            
Maximum | LIBOR | Unsecured debt | $200 Million Term Loan                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate                 2.15%            
Option One | Minimum | LIBOR | Unsecured debt | 2018 Term Loan                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate           1.35%                  
Option One | Minimum | LIBOR | Unsecured debt | 2017 Term Loan                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate             1.45%                
Option One | Maximum | LIBOR | Unsecured debt | 2018 Term Loan                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate           1.95%                  
Option One | Maximum | LIBOR | Unsecured debt | 2017 Term Loan                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate             2.25%                
Fair Value                              
Debt Instrument [Line Items]                              
Debt with variable interest rates that had been converted to fixed interest rates                 $ 400,000,000.0   $ 400,000,000.0        
Line of Credit | $200 Million Credit Facility                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity $ 500,000,000                            
Additional borrowing capacity 300,000,000                            
Credit facility, current borrowing capacity $ 200,000,000                            
Line of Credit | Option One | LIBOR | $200 Million Credit Facility                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate 2.15%                            
Line of Credit | Option Two | LIBOR | $200 Million Credit Facility                              
Debt Instrument [Line Items]                              
Debt basis spread on variable rate 2.15%                            
Revolving Credit Facility | $125 Million Revolver                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity $ 125,000,000