Accounts Payable and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 276	$ 1,218
Interest payable	953	953
Deferred revenue	918	922
Security deposits	1,840	1,675
Deferred straight-line ground rent	18,669	16,628
Accrued distributions attributable to Preferred Units	11,363	9,091
Accrued expenses	6,107	4,001
Asset retirement obligations	671	625
Total accounts payable and other liabilities	$ 40,797	$ 35,113