Preferred Equity Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Preferred Equity Investment [Line Items]
Preferred equity investment, aggregate amount invested			$ 0	$ 127,147
Preferred equity investment, dividend income	$ 2,706	$ 2,603	$ 5,411	3,119
Series B Redeemable Cumulative Preferred Stock [Member] | Private Healthcare Real Estate Corporation [Member]
Preferred Equity Investment [Line Items]
Preferred equity investment, aggregate amount invested					$ 127,147
Preferred equity investment, dividend rate percentage			7.875%
Preferred equity investment, principal amount	125,000		$ 125,000
Preferred equity investment, origination costs	2,772		2,772
Preferred equity investment, closing fee	625		625
Preferred equity investment, dividend income	$ 2,461	$ 2,460	$ 4,922	$ 2,898