NONCONTROLLING INTERESTS (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Partnership Ownership
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 19,520	$ 7,082	$ 1,510
Operating Partnership
Operating Partnership Ownership
OP Units outstanding which are not owned by the general partner (as a percent)	2.40%	3.70%
Number of trading days used to determine average of the closing prices of the common shares	10
OP units outstanding (in shares)	3,293,730	4,674,136
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 19,520	$ 7,082	$ 1,510