Schedule III Real Estate And Accumulated Depreciation (Schedule Of Changes In Rental Properties And Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]
Balance	$ 143,384	$ 188,899	$ 214,585
Additions	134,709	25,618	46,489
Disposals	(34,814)	(68,256)	(65,802)
Impairment loss, net	(2,151)	(2,877)	(6,373)
Balance	241,128	143,384	188,899
Balance	28,513	58,200	75,403
Depreciation for the period	6,898	5,190	5,400
Depreciation on assets sold or disposed	(13,863)	(33,477)	(19,938)
Impairment loss, net		(1,400)	(2,665)
Balance	21,548	$ 28,513	$ 58,200
Aggregate cost of land, buildings, furniture and equipment for Federal income tax purposes	$ 245,000
Minimum [Member] | Building And Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life used for computation of depreciation	15 years
Minimum [Member] | Furniture And Equipment [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life used for computation of depreciation	3 years
Maximum [Member] | Building And Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life used for computation of depreciation	40 years
Maximum [Member] | Furniture And Equipment [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life used for computation of depreciation	12 years