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DEBT - Narrative (Details)
12 Months Ended
Jan. 12, 2021
USD ($)
$ / shares
Jan. 07, 2021
USD ($)
Oct. 08, 2019
USD ($)
Jan. 31, 2019
Feb. 15, 2018
USD ($)
Sep. 26, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2020
USD ($)
Property
Dec. 31, 2017
USD ($)
Feb. 05, 2021
USD ($)
May 07, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 06, 2018
USD ($)
Debt Instrument [Line Items]                          
Weighted average interest rate for all borrowings               3.43%       3.95%  
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  
$75 Million Term Loan                          
Debt Instrument [Line Items]                          
Debt instrument, face amount     $ 75,000,000                    
Difference of basis spread on variable rate     0.05%                    
Debt extension term     12 months                    
Unsecured debt | Senior credit facility $600 Million                          
Debt Instrument [Line Items]                          
Credit facility, maximum borrowing capacity               600,000,000         $ 600,000,000.0
Line of credit outstanding               355,000,000.0          
Amount available for borrowing               165,000,000.0          
Conditional additional borrowing capacity               50,000,000.0          
Additional borrowing capacity               $ 300,000,000.0          
Unsecured debt | $400 Million Revolver                          
Debt Instrument [Line Items]                          
Credit facility, maximum borrowing capacity                         400,000,000
Unsecured debt | $200 Million Term Loan                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                         $ 200,000,000.0
Fixed interest rate               2.35%          
Unsecured debt | First Amendment to Credit Agreement                          
Debt Instrument [Line Items]                          
Additional borrowing capacity                     $ 100,000,000    
Unsecured debt | Third Amendment To Credit Agreement | Subsequent events                          
Debt Instrument [Line Items]                          
Conditional additional borrowing capacity                   $ 50,000,000      
Additional borrowing capacity                   350,000,000      
Debt covenant, liquidity amount                   $ 150,000,000      
Unsecured debt | 2018 Term Loan                          
Debt Instrument [Line Items]                          
Debt instrument, face amount         $ 225,000,000.0                
Additional borrowing capacity         $ 150,000,000.0                
Effective interest rate               2.15%          
Unsecured debt | 2017 Term Loan                          
Debt Instrument [Line Items]                          
Debt instrument, face amount           $ 225,000,000.0              
Additional borrowing capacity           $ 175,000,000.0              
Effective interest rate               2.45%          
Unsecured debt | $75 Million Term Loan                          
Debt Instrument [Line Items]                          
Fixed interest rate               2.35%          
Unsecured debt | $300 Million Revolver                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                 $ 300,000,000        
Convertible Debt | 1.50% convertible senior notes due 2026 | Subsequent events                          
Debt Instrument [Line Items]                          
Debt instrument, face amount   $ 287,500,000                      
Fixed interest rate   1.50%                      
Proceeds from convertible debt   $ 279,800,000                      
Convertible debt, conversion ratio 83.4028                        
Convertible debt, conversion ratio, principal amount of calculation base $ 1,000                        
Convertible debt, conversion price (in dollars per share) | $ / shares $ 11.99                        
Convertible debt, strike price of capped call transactions (in dollars per share) | $ / shares $ 15.26                        
Convertible debt, strike price of capped call transactions, premium percentage 75.00%                        
Line of Credit | Joint Venture 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                    
Advances limit term, borrowing base asset value multiplier     0.55                    
Revolving credit facility | $125 Million Revolver                          
Debt Instrument [Line Items]                          
Credit facility, maximum borrowing capacity     $ 125,000,000                    
Debt extension term     12 months                    
Revolving credit facility | Unsecured debt | $400 Million Revolver                          
Debt Instrument [Line Items]                          
Fixed interest rate               2.40%          
Revolving credit facility | Unsecured debt | $125 Million Revolver                          
Debt Instrument [Line Items]                          
Fixed interest rate               2.40%          
Option One | Unsecured debt | 2018 Term Loan | LIBOR | Minimum                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis         1.35%                
Option One | Unsecured debt | 2018 Term Loan | LIBOR | Maximum                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis         1.95%                
Option One | Unsecured debt | 2017 Term Loan | LIBOR | Minimum                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis           1.45%              
Option One | Unsecured debt | 2017 Term Loan | LIBOR | Maximum                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis           2.25%              
Option One | Line of Credit | $125 Million Revolver | LIBOR                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis     2.15%                    
Option Two | Line of Credit | $125 Million Revolver | LIBOR                          
Debt Instrument [Line Items]                          
Interest rate margin on variable rate basis     2.15%                    
MetaBank | Secured debt | Non-recourse loan                          
Debt Instrument [Line Items]                          
Debt instrument, face amount             $ 47,600,000            
Amount drawn from secured debt                 $ 47,600,000        
Fixed interest rate             4.44%            
Debt interest only payments term       24 months     18 months            
Loan amortization period after interest only payments period               25 years          
Debt instrument, collateral, number of real estate properties | Property               3