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LONG-TERM DEBT (Details 2) (USD $)
 6 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Partnership's revolving credit facility due November 2015
Mar. 31, 2012
Partnership's revolving credit facility due November 2015
Jun. 30, 2012
Partnership's revolving credit facility due November 2015
Mar. 31, 2012
Revolving credit facility due July 2016
Mar. 31, 2012
Revolving credit facility due July 2016
Jun. 30, 2012
Revolving credit facility due July 2016
Mar. 31, 2011
Asset Backed Securitization Facility
Long-term Debt                  
Increase in borrowing capacity     $ 200,000,000            
Revolving credit facility borrowing capacity     750,000,000 750,000,000   900,000,000 900,000,000    
Transaction costs 549,000 980,000   500,000          
Decrease in borrowing capacity           200,000,000      
Write-off of deferred financing costs             1,300,000   1,400,000
Repayment of long term debt 1,158,104,000 1,205,258,000             6,000,000
Outstanding borrowings               356,500,000  
Outstanding letters of credit               195,900,000  
Undrawn and available capacity under revolving credit facility               347,600,000  
Undrawn capacity available for additional borrowings         $ 256,500,000