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Debt - Minimum Future Payments Due on Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Unsecured and secured debt    
Debt Instrument [Line Items]    
2020 $ 65,095  
2021 632  
2022 575,085  
2023 165,646  
2024 5,001  
Thereafter 2,034,000  
Total 2,845,459 $ 2,640,381
In-Substance Defeased Debt    
Debt Instrument [Line Items]    
2020 3,323  
2021 3,494  
2022 128,213  
2023 0  
2024 0  
Thereafter 0  
Total 135,030  
Joint venture partner debt    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
Thereafter 66,136  
Total $ 66,136