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Debt - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 21, 2018
USD ($)
option
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Debt, net   $ 504,965,000 $ 555,109,000   $ 555,109,000
Revolving Credit Facility, Amended and Restated          
Debt Instrument [Line Items]          
Repayments of lines of credit   50,000,000 100,000,000    
Mortgages Payable          
Debt Instrument [Line Items]          
Long-term debt, net   106,437,000 106,728,000   106,728,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding borrowings   350,000,000 300,000,000   300,000,000
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 350,000,000        
Long-term line of credit   $ 0 $ 50,000,000   $ 50,000,000
Unused commitment fee (percent)   0.15%     0.15%
Proceeds from lines of credit       $ 150,000,000  
Debt instrument, term 4 years        
Number of extension options | option 2        
Extension option on line of credit, period 6 months        
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | One-month LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)       1.05%