Other Liabilities and Deferred Credits (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other liabilities and deferred credits
Acquired below market leases, net	$ 47,543	$ 48,617
Prepaid rent and deferred revenue	4,852	5,008
Deferred rent expense and lease intangible	1,075	1,122
Deferred compensation	571	520
Straight-line rent liability	232	433
Other liabilities	43	108
Total other liabilities and deferred credits	$ 54,316	$ 55,808