Agreements and Transactions with Related Parties (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts Included in the Consolidated Statements of Income:
Asset management fees	$ 21,953	$ 18,932	$ 13,435
Available Cash Distribution	16,899	14,620	9,378
Acquisition expenses	11,448	12,092	0
Personnel and overhead reimbursements	9,243	5,205	2,258
Office rent reimbursements	1,293	756	411
Interest expense on deferred acquisition fees and loan from affiliate	827	930	1,194
Operating expenses	61,663	52,535	26,676
Other Acquisition Fees Capitalized:
Current acquisition fees	4,777	17,448	24,559
Deferred acquisition fees	3,063	14,162	17,398
Transaction fees incurred	7,840	31,610	41,957
Due to Affiliates:
Deferred acquisition fees, including interest	15,573	26,732
Accounts payable	2,200	339
Asset management fees payable	1,972	1,651
Reimbursable costs	264	603
Subordinated disposition fees	202	202
Due to affiliates	$ 20,211	$ 29,527