Real Property Acquisitions and Development (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Development projects:
Total development projects	$ 137,544	$ 164,833
Expansion projects	8,155	240
Total construction in progress conversions	145,699	165,073
Medical facilities [Member]
Development projects:
Total development projects	70,227	105,666
Seniors Housing Facilities Triple Net [Member]
Development projects:
Total development projects	$ 67,317	$ 59,167