Real Property Acquisitions and Development (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Development projects:
Development projects	$ 198,859,000	$ 260,544,000	$ 336,048,000
Expansion projects	24,804,000	26,395,000	4,983,000
Total construction in progress conversions	223,663,000	286,939,000	341,031,000
Senior Housing Facilities Triple Net [Member]
Development projects:
Development projects	71,569,000	133,181,000	146,913,000
Medical Facilities [Member]
Development projects:
Development projects	$ 127,290,000	$ 127,363,000	$ 189,135,000