Preferred Equity Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Preferred Equity Investment [Line Items]
Preferred equity investment, aggregate amount invested			$ 127,147	$ 0
Preferred equity investment, dividend income	$ 2,603	$ 162	3,119	$ 200
Series B Redeemable Cumulative Preferred Stock [Member] | Private 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	$ 2,460		$ 2,898