RELATED PARTY TRANSACTIONS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
Total rental income	$ 62,405,000	$ 58,310,000	$ 181,332,000	$ 165,058,000
Investment in WBW CHP LLC (in percent)			47.70%
ICW Plaza
Related Party Transaction [Line Items]
Total rental income			1,600,000
WBW CHP LLC
Related Party Transaction [Line Items]
Recovered reimbursements of operating expenses of WBW CHP LLC			$ 800,000	$ 500,000