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Leases (Book Value Of Assets Under Operating Leases From Owned Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property Subject to or Available for Operating Lease [Line Items]    
Gross balance $ 559,785 $ 605,562
Accumulated depreciation (243,040) (252,437)
Operating property, net 316,745 353,125
Building And Improvements [Member]    
Property Subject to or Available for Operating Lease [Line Items]    
Gross balance 138,704 153,643
Accumulated depreciation (22,441) (26,107)
Operating property, net $ 116,263 $ 127,536