Agreements and Transactions with Related Parties (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Amounts Included in the Consolidated Statements of Income
Asset management fees	$ 7,482	$ 7,142
Available Cash Distributions	6,668	6,064
Personnel and overhead reimbursements	2,661	3,456
Acquisition expenses	1,223	430
Interest expense on deferred acquisition fees and loan from affiliate	63	73
Operating expenses	18,097	17,165
Acquisition Fees Capitalized
Personnel and overhead reimbursements	61	0
Current acquisition fees	14	2,434
Deferred acquisition fees	11	1,729
Transaction fees incurred	$ 86	$ 4,163