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LONG-TERM INCENTIVE COMPENSATION (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
LTIP Units and Restricted Stock [Member]
Mar. 31, 2011
LTIP Units and Restricted Stock [Member]
Dec. 31, 2011
LTIP Units and Restricted Stock [Member]
Mar. 15, 2012
Officer [Member]
Mar. 15, 2012
Officer [Member]
LTIP Units [Member]
Mar. 15, 2012
Officer [Member]
Restricted Stock [Member]
Mar. 15, 2012
Other Employees [Member]
Restricted Stock [Member]
Dec. 31, 2009
Senior Executives [Member]
Long Term Investment Alignment Program [Member]
Mar. 31, 2012
Senior Executives [Member]
Long Term Investment Alignment Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)             279,611 1,358 9,435    
Percent of Awards Issued to Officers Subject to Performance Measures           17.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years                
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures     $ 6,400,000                
Share-based Compensation 970,000 853,000 200,000   2,600,000            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     3,800,000                
Long Term Incentive and Share Based Compensation Expense     $ 900,000 $ 800,000              
Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards                   25.00%  
Percent of Units Awarded                     83.00%