Agreements and Transactions with Related Parties (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Due to Related Parties [Abstract]
Deferred acquisition fees, including interest	$ 23,121	$ 26,747
Shareholder servicing fee liability	8,855	9,394
Current acquisition fees	5,901	3,148
Accounts payable and other	2,743	3,872
Asset management fees payable	821	813
Due to affiliate	$ 41,441	$ 43,974