SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS IN PARTNERSHIP (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Partnership Units [Abstract]
Total number of Common Units outstanding (in shares)	7,270,316	7,418,912	8,701,810
Common units converted to Class A Common Shares (in shares)	195,000	2,934,511	44,490