Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts payable and accrued expenses
Accrued costs on properties under development	$ 18,889	$ 14,058
Other items	26,083	30,047
Total accounts payable and accrued expenses	78,271	102,511
Acquired lease intangible liabilities, net
Acquired below-market leases	220,329	158,703
Accumulated amortization of acquired below-market leases	(19,084)	(10,453)
Acquired lease intangible liabilities	201,245	148,250
Other liabilities
Rent received in advance	31,718	31,144
Preferred units issued upon acquisition of ARCT	6,750	6,750
Security deposits	5,942	6,136
Total other liabilities	44,410	44,030
Notes
Accounts payable and accrued expenses
Interest payable	30,264	55,616
Mortgages
Accounts payable and accrued expenses
Interest payable	$ 3,035	$ 2,790