TENANT ORIGINATION AND ABSORPTION COSTS, ABOVE-MARKET LEASE ASSETS AND BELOW-MARKET LEASE LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Abstract]
Tenant Origination and Absorption Costs, Cost	$ 86,961		$ 86,961		$ 40,418
Tenant Origination and Absorption Costs, Accumulated Amortization	(10,943)		(10,943)		(6,268)
Tenant Origination and Absorption Costs, Net Amount	76,018		76,018		34,150
Tenant Origination and Absorption Costs, Amortization expense	(2,953)	(1,971)	(5,506)	(2,680)
Above-Market Lease Assets, Cost	1,100		1,100		1,025
Above-Market Lease Assets, Accumulated Amortization	(285)		(285)		(144)
Above-Market Lease Assets, Net Amount	815		815		881
Above-Market Lease Assets, Amortization expense	(78)	(31)	(164)	(41)
Below-Market Lease Liabilities, Cost	(18,634)		(18,634)		(5,659)
Below-Market Lease Liabilities, Accumulated Amortization	1,130		1,130		507
Below-Market Lease Liabilities, Net Amount	(17,504)		(17,504)		(5,152)
Below-Market Lease Liabilities, Amortization expense	$ 407	$ 164	$ 676	$ 200