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Debt - Schedule of Total Fixed-Rate and Variable Rate Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Fixed-rate debt [1] $ 1,322,421 $ 1,287,219
Variable-rate debt 50,000 201,351
Debt, gross $ 1,372,421 $ 1,488,570
Weighted-average interest rate of debt 3.47% 3.86%
Fixed-rate debt, Percentage [1] 96.00% 86.00%
Variable-rate debt, Percentage 4.00% 14.00%
[1] Fixed-rate debt includes the portion of variable-rate debt where the interest payments have been effectively fixed by interest rate swaps as of the respective balance sheet date. See Note 5 for more information on the interest rate swap agreements.