Real Estate (Summary of Income from Discontinued Operations) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
REVENUES
Rental revenues	$ 1,396,000	$ 21,985,000	$ 45,391,000	$ 65,757,000
Other	26,000	81,000	184,000	302,000
Total revenues	1,422,000	22,066,000	45,575,000	66,059,000
EXPENSES
Operating, maintenance and management	377,000	4,310,000	10,818,000	14,227,000
Real estate and other property-related taxes	216,000	3,277,000	6,750,000	9,768,000
General and administrative		265,000	468,000	165,000
Depreciation and amortization		6,471,000	9,726,000	21,503,000
Total expenses	593,000	14,323,000	27,762,000	45,663,000
OPERATING INCOME	829,000	7,743,000	17,813,000	20,396,000
NON-OPERATING INCOME AND EXPENSES
Interest expense	(473,000)	(1,451,000)	(3,511,000)	(3,160,000)
Total non-operating income and expenses	(473,000)	(1,451,000)	(3,511,000)	(3,160,000)
INCOME FROM DISCONTINUED OPERATIONS	356,000	6,292,000	14,302,000	17,236,000
Impairment charges		(23,749,000)	(16,629,000)	(23,749,000)
Gain on sales	125,500,000		125,500,000	1,047,000
Total income (loss) from discontinued operations	$ 125,856,000	$ (17,457,000)	$ 123,173,000	$ (5,466,000)