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Debt - Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, gross $ 2,313,397 $ 2,225,983
Unamortized debt issuance costs (7,088) (7,585)
Principal outstanding 2,306,173 2,218,262
Long-term debt, fair value 2,294,244 2,264,730
Debt Instrument, Unamortized Discount (Premium), Net (136) (136)
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Principal outstanding 384,000 296,000
Long-term debt, fair value 383,927 296,000
Unsecured Term Loans    
Debt Instrument [Line Items]    
Long-term debt, gross 975,000 975,000
Unamortized debt issuance costs (4,075) (4,423)
Principal outstanding 970,925 970,577
Long-term debt, fair value 975,015 975,224
Unsecured Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 900,000 900,000
Unamortized debt issuance costs (2,942) (3,059)
Principal outstanding 897,058 896,941
Long-term debt, fair value 880,674 937,183
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Long-term debt, gross 54,397 54,983
Unamortized debt issuance costs (71) (103)
Principal outstanding 54,190 54,744
Long-term debt, fair value 54,628 56,323
Debt Instrument, Unamortized Discount (Premium), Net $ (136) $ (136)