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DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Feb. 18, 2020
USD ($)
Oct. 08, 2019
USD ($)
Mar. 19, 2019
USD ($)
Property
Jan. 31, 2019
Feb. 15, 2018
USD ($)
Sep. 26, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2020
USD ($)
Property
Mar. 31, 2019
USD ($)
Dec. 11, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
May 07, 2020
USD ($)
Apr. 01, 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)               3.48%     3.95%          
Long-term debt               $ 1,135,019,000     $ 1,016,163,000          
Repayments of debt               45,931,000 $ 42,326,000              
Debt transaction costs               $ 1,000 $ 713,000              
$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%                            
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         $ 156,800,000                
Unsecured debt | 2018 Unsecured Credit Facility                                
Debt Instrument [Line Items]                                
Credit facility, maximum borrowing capacity                               $ 600,000,000.0
Line of credit amount borrowed               395,000,000.0                
Amount available for borrowing               139,300,000                
Maximum increase in borrowing capacity available through accordion feature option               $ 300,000,000.0                
Number of properties that served as collateral for loans | Property               52                
Unsecured debt | $400 Million Revolver                                
Debt Instrument [Line Items]                                
Credit facility, maximum borrowing capacity               $ 400,000,000               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               2.69%                
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               2.74%                
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               2.49%                
Decrease in interest expense from repricing $ 900,000                              
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%                
Minimum | LIBOR | Unsecured debt | 2018 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%                
Maximum | LIBOR | Unsecured debt | 2018 Term Loan                                
Debt Instrument [Line Items]                                
Debt basis spread on variable rate 1.90%                              
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          
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                            
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%                            
Line of Credit | Option Three | LIBOR | $200 Million Credit Facility                                
Debt Instrument [Line Items]                                
Debt basis spread on variable rate   1.00%                            
Line of Credit | Option Three | Federal Funds Rate | $200 Million Credit Facility                                
Debt Instrument [Line Items]                                
Debt basis spread on variable rate   0.50%                            
Line of Credit | Option Three | Base rate | $200 Million Credit Facility                                
Debt Instrument [Line Items]                                
Debt basis spread on variable rate   1.15%                            
Revolving Credit Facility | $125 Million Revolver                                
Debt Instrument [Line Items]                                
Credit facility, maximum borrowing capacity   $ 125,000,000                            
Subsequent Event | Unsecured debt                                
Debt Instrument [Line Items]                                
Long-term debt                           $ 25,000,000.0    
Subsequent Event | Unsecured debt | $400 Million Revolver                                
Debt Instrument [Line Items]                                
Additional borrowing capacity                         $ 100,000,000      
Conditional borrowing capacity                         $ 50,000,000