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Indebtedness Secured Debt (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loans
Dec. 31, 2018
USD ($)
loans
Dec. 31, 2017
USD ($)
Nov. 30, 2019
Oct. 31, 2019
Aug. 31, 2019
Sep. 30, 2018
Debt Instrument [Line Items]              
gross basis of secured properties $ 99,000            
Letters of Credit Outstanding, Amount 1,900            
Fair value 3,081,932 $ 2,662,401          
Debt Instrument, Interest Rate, Effective Percentage       3.96% 3.91% 2.80% 4.13%
Repayments of Secured Debt 45,515 232,234 $ 72,648        
Repaid Debt, Weighted Average Interest Rate             7.63%
Fixed Rate Secured Debt [Member]              
Debt Instrument [Line Items]              
Fair value $ 34,547 $ 80,238          
number of secured loans repaid | loans 3 3          
Repayments of Secured Debt $ 41,700 $ 227,100          
Repaid Debt, Weighted Average Interest Rate 7.76% 7.62%          
Minimum [Member] | Fixed Rate Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 3.10%            
Maximum [Member] | Fixed Rate Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 3.30%