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Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity    
Property, net $ 6,330,391 $ 6,694,579
Total assets 8,412,226 9,184,005
Mortgage notes payable 4,432,587 4,560,810
Total liabilities 5,177,435 6,738,745
Operating Partnership    
Variable Interest Entity    
Property, net 463,949 551,062
Other assets 84,510 97,713
Total assets 548,459 648,775
Mortgage notes payable 413,902 420,233
Other liabilities 59,240 81,266
Total liabilities $ 473,142 $ 501,499