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Debt - 2022 Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Instrument [Line Items]      
Debt Instrument, Unused Borrowing Capacity, Amount $ 362,300    
Assumption of mortgage notes 0 $ 5,103  
Debt Instrument, Unamortized Discount (Premium), Net $ 136   $ 136
Debt Instrument, Covenant Compliance The Company was in compliance with all financial and other covenants   The Company was in compliance with all financial and other covenants
Net book value of properties that are collateral for debt arrangements $ 87,800   $ 88,500
Long-term debt, gross $ 2,313,397   2,225,983
Unsecured Credit Facility | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.775%    
Interest Expense [Member]      
Debt Instrument [Line Items]      
Amortization of deferred financing fees $ 864 487  
Line of Credit Facility, Commitment Fee Amount 341 $ 386  
Accounts Payable and Accrued Liabilities [Member]      
Debt Instrument [Line Items]      
Interest payable $ 8,200   $ 8,600