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Borrowing Arrangements - Fair Value of Mortgage Debt (Details) - Level 2 - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Debt Instrument    
Mortgage notes payable, excluding deferred financing costs $ 2,722,619 $ 2,537,137
Carrying Value    
Debt Instrument    
Mortgage notes payable, excluding deferred financing costs $ 2,633,681 $ 2,472,876