COMPONENTS OF RENTAL INCOME AND EXPENSE - Component of Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Rental Income [Line Items]
Cost reimbursement	$ 7,568	$ 6,906	$ 14,605	$ 13,710
Percentage rent	365	391	725	816
Hotel revenue	8,727	7,043	17,735	16,045
Other	390	412	783	831
Total rental income	63,552	58,793	126,305	119,275
Total Retail
Rental Income [Line Items]
Minimum rents	18,256	17,448	36,467	34,740
Total Office
Rental Income [Line Items]
Minimum rents	21,533	20,200	42,720	40,436
Total Multifamily
Rental Income [Line Items]
Minimum rents	4,136	3,897	8,170	7,731
Total Mixed-Use
Rental Income [Line Items]
Minimum rents	$ 2,577	$ 2,496	$ 5,100	$ 4,966