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Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total $ 2,229,193 $ 1,732,338
As To Interest Rate [Member]    
Debt Instrument [Line Items]    
Fixed-rate debt 1,732,193 1,714,890
Variable-rate debt 497,000 17,448
Total 2,229,193 1,732,338
As To Collateralization [Member]    
Debt Instrument [Line Items]    
Unsecured debt 1,948,229 1,450,762
Secured debt 280,964 281,576
Total $ 2,229,193 $ 1,732,338