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, 2019
Dec. 31, 2018
Dec. 31, 2017
Real Estate Investments And Accumulated Depreciation [Abstract]      
Rental Properties, Balance at beginning of year $ 5,306,017 $ 5,102,844 $ 4,804,867
Rental Properties, Additions 1,349,959 686,452 1,179,365
Rental Properties, Real estate held for sale (1,553,383) (184,233) (310,089)
Rental Properties, Properties sold (824,167) (238,873) (538,424)
Rental Properties, Retirements/disposals (21,745) (60,173) (32,875)
Rental Properties, Balance at end of year 4,256,681 5,306,017 5,102,844
Accumulated Depreciation, Balance at beginning of year 1,097,868 1,087,083 1,332,073
Accumulated Depreciation, Depreciation expense 156,250 140,726 154,343
Accumulated Depreciation, Real estate held for sale (411,833) (30,404) (126,503)
Accumulated Depreciation, Properties sold (261,923) (39,364) (217,625)
Accumulated Depreciation, Repurposed buildings     (22,330)
Accumulated Depreciation, Retirements/disposals (21,745) (60,173) (32,875)
Accumulated Depreciation, Balance at end of year $ 558,617 $ 1,097,868 $ 1,087,083