Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts payable and accrued expenses
Accrued costs on properties under development	$ 17,974	$ 14,058
Other items	23,369	30,047
Total accounts payable and accrued expenses	98,973	102,511
Acquired lease intangible liabilities, net
Acquired below-market leases	190,767	158,703
Accumulated amortization of acquired below-market leases	(15,998)	(10,453)
Acquired lease intangible liabilities	174,769	148,250
Other liabilities
Rent received in advance	24,002	31,144
Preferred units issued upon acquisition of ARCT	6,750	6,750
Security deposits	5,930	6,136
Total other liabilities	36,682	44,030
Notes
Accounts payable and accrued expenses
Interest payable	54,386	55,616
Mortgages
Accounts payable and accrued expenses
Interest payable	$ 3,244	$ 2,790