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Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total $ 1,730,153 $ 1,732,338
As To Interest Rate [Member]    
Debt Instrument [Line Items]    
Fixed-rate debt 1,730,153 1,714,890
Variable-rate debt   17,448
Total 1,730,153 1,732,338
As To Collateralization [Member]    
Debt Instrument [Line Items]    
Unsecured debt 1,452,167 1,450,762
Secured debt 277,986 281,576
Total $ 1,730,153 $ 1,732,338