Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 building property	Dec. 31, 2013	Dec. 31, 2012
Real estate properties
Number of properties that met the criteria for discontinued operations	5
Number of buildings that met the criteria for discontinued operations	8
Income from discontinued operations	$ 1,362	$ 5,043	$ 4,061
MOBs
Real estate properties
Number of properties that met the criteria for discontinued operations	4
Number of buildings that met the criteria for discontinued operations	7	7
Discontinued operations, properties sold or held for sale
Real estate properties
Rental income	3,949	9,451	10,042
Property operating expenses	(2,587)	(3,609)	(3,567)
Depreciation and amortization		(799)	(2,414)
Income from discontinued operations	$ 1,362	$ 5,043	$ 4,061