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Indebtedness Secured Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 28, 2020
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage     3.19%
Repayments of Secured Debt $ 876 $ 42,665  
Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 18,400
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     3.41%
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 325,000
Minimum [Member] | Fixed Rate Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 3.00%    
Maximum [Member] | Fixed Rate Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 3.60%