SEGMENT REPORTING Operating Activity Within Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
OPERATING INCOME	$ 17,712	$ 19,373	$ 38,066	$ 39,253
Total Segments' profit	40,556	40,752	81,863	81,846
Total Retail
Segment Reporting Information [Line Items]
Property revenue	23,570	23,497	46,569	45,651
Property expense	(6,448)	(6,060)	(12,506)	(11,031)
OPERATING INCOME	17,122	17,437	34,063	34,620
Total Office
Segment Reporting Information [Line Items]
Property revenue	22,433	22,512	45,264	44,934
Property expense	(6,085)	(6,584)	(12,978)	(13,020)
OPERATING INCOME	16,348	15,928	32,286	31,914
Total Multifamily
Segment Reporting Information [Line Items]
Property revenue	4,210	3,974	8,340	7,849
Property expense	(1,554)	(1,416)	(2,981)	(2,858)
OPERATING INCOME	2,656	2,558	5,359	4,991
Total Mixed-Use
Segment Reporting Information [Line Items]
Property revenue	11,972	12,931	25,965	26,660
Property expense	(7,542)	(8,102)	(15,810)	(16,339)
OPERATING INCOME	$ 4,430	$ 4,829	$ 10,155	$ 10,321