Real Estate Fund Investments - Schedule of Income from Fund Investment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Investment Holdings [Line Items]
Income from real estate fund investments	$ 1,412	$ 37,975
Investment Income [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	3,334	13,406
Investment Expenses [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	565	1,132
Net Investment Income [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	2,769	12,274
Net Realized Gains
Investment Holdings [Line Items]
Income from real estate fund investments	50	11,955
Previously recorded unrealized gains on exited investments
Investment Holdings [Line Items]
Income from real estate fund investments		(6,584)
Net Unrealized Gains (Losses) [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	$ (1,407)	$ 20,330