Dispositions (Results of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Rental income									$ 4,331	$ 14,060	$ 34,840
Resident fees and services									0	759	6,435
Interest and other income									750	0	5,052
Total Revenues									5,081	14,819	46,327
Expenses:
Interest									1,714	5,472	13,314
Depreciation and amortization									1,555	47,806	49,807
Property-level operating expenses									507	1,994	7,971
General, administrative and professional fees									0	3	303
Gain on extinguishment of debt, net									0	(153)	0
Other									412	(407)	1,902
Total expenses									4,188	54,715	73,297
Income (loss) before income taxes and gain on real estate dispositions									893	(39,896)	(26,970)
Income tax benefit									0	0	4
Gain on real estate dispositions									1,213	3,617	80,952
Discontinued operations	$ (411)	$ (259)	$ (255)	$ 3,031	$ (115)	$ (9,174)	$ (18,559)	$ (8,431)	$ 2,106	$ (36,279)	$ 53,986