Real Estate Fund Investments - Schedule of Fair Value of Income from Fund Investment (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Investment Holdings [Line Items]
Income from real estate fund investments	$ 14,072	$ 19,293
Investment Income [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	2,853	7,348
Investment Expenses [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	45	191
Net Investment Income [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	2,808	7,157
Net Unrealized Gains [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	$ 11,264	$ 12,136