Summary of Significant Accounting Policies (Details 3) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Jun. 24, 2015 $ / shares	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2014 $ / shares	Jun. 30, 2015 USD ($) building item $ / shares	Jun. 30, 2014 $ / shares	Dec. 31, 2014 USD ($)
Dividends and Distributions
Cash dividend declared to common shareholders (in dollars per share) | $ / shares	$ 0.225	$ 0.225	$ 0.225	$ 0.45	$ 0.45
Real Estate Loans Receivable
Number of mezzanine loans collateralized				2
Number of medical office building developments as collateral for real estate loans receivable | building				3
Rental Revenue
Rental revenue due in excess of amounts currently due from tenants | $		$ 10.4		$ 10.4		$ 6.4
Minimum
Income taxes
Distribution requirement to shareholders to qualify as a REIT				90.00%