Accounts Payable and Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 246	$ 366
Interest payable	970	971
Deferred revenue	1,313	1,026
Security deposits	1,791	1,789
Deferred straight-line ground rent	15,098	14,588
Cumulative unpaid distributions attributable to Preferred Units	7,386	6,818
Accrued expenses	5,962	5,789
Asset retirement obligations	657	654
Total accounts payable and other liabilities	$ 33,423	$ 32,001