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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jan. 31, 2021
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 83,700 $ 83,700   $ 83,700   $ 450,000
Debt Instrument, Interest Rate, Stated Percentage 3.88% 3.88%   3.88%   1.75%
Loss on debt extinguishment $ 3,900 $ 3,938 $ 14,972 $ 4,008 $ 32,778  
Debt Instrument, Interest Rate, Effective Percentage           1.83%
Non-cash distribution of properties from Unconsolidated Joint Ventues            
Debt Instrument [Line Items]            
Repayments of Assumed Debt       $ 40,200    
Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum       96.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum       129.00%    
Debt Instrument, Covenant Compliance       We were in compliance with all such financial covenants at