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Debt - Minimum Future Payments Due on Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total $ 2,640,381 $ 2,439,311
Unsecured and Secured Debt    
Debt Instrument [Line Items]    
2019 5,569  
2020 440,095  
2021 632  
2022 900,085  
2023 160,000  
Thereafter 1,134,000  
Total 2,640,381  
In-Substance Defeased Debt    
Debt Instrument [Line Items]    
2019 3,193  
2020 3,323  
2021 3,494  
2022 128,213  
2023 0  
Thereafter 0  
Total 138,223 0
Joint venture partner debt    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 0  
2022 0  
2023 0  
Thereafter 66,136  
Total $ 66,136 $ 0