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Leases (Book Value Of Assets Under Operating Leases From Owned Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]    
Net Book Value $ 46,825 $ 50,178
Building And Improvements [Member]    
Property Subject to or Available for Operating Lease [Line Items]    
Gross balance 65,103 67,887
Accumulated depreciation $ (18,278) $ (17,709)