Annual report pursuant to Section 13 and 15(d)

Real Estate Investments And Accumulated Depreciation (Schedule Of Changes In Rental Properties And Accumulated Depreciation) (Details)

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Real Estate Investments And Accumulated Depreciation (Schedule Of Changes In Rental Properties And Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Investments And Accumulated Depreciation [Abstract]      
Rental Properties, Balance at beginning of year $ 5,102,844 $ 4,804,867 $ 4,807,718
Rental Properties, Additions 686,452 1,179,365 819,535
Rental Properties, Rental property held for sale (184,233) (310,089) (79,200)
Rental Properties, Properties sold (238,873) (538,424) (695,837)
Rental Properties, Impairments
Rental Properties, Retirements/disposals (60,173) (32,875) (47,349)
Rental Properties, Balance at end of year 5,306,017 5,102,844 4,804,867
Accumulated Depreciation, Balance at beginning of year 1,087,083 1,332,073 1,464,482
Accumulated Depreciation, Depreciation expense 140,726 154,343 151,569
Accumulated Depreciation, Rental property held for sale (30,404) (126,503) (31,792)
Accumulated Depreciation, Properties sold (39,364) (217,625) (204,837)
Accumulated Depreciation, Repurposed buildings (22,330)
Accumulated Depreciation, Impairments
Accumulated Depreciation, Retirements/disposals (60,173) (32,875) (47,349)
Accumulated Depreciation, Balance at end of year $ 1,097,868 $ 1,087,083 $ 1,332,073