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LONG-TERM DEBT (Details 2) (USD $)
 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Partnership's revolving credit facility due November 2015
Mar. 31, 2012
Partnership's revolving credit facility due November 2015
Sep. 30, 2012
Partnership's revolving credit facility due November 2015
Mar. 31, 2012
Revolving credit facility due July 2016
Jul. 31, 2011
Revolving credit facility due July 2016
Sep. 30, 2011
Revolving credit facility due July 2016
Sep. 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              
Decrease in borrowing capacity           200,000,000        
Revolving credit facility borrowing capacity     750,000,000 750,000,000   900,000,000 1,100,000,000      
Transaction costs 549,000 8,646,000   500,000     7,800,000      
Write-off of deferred financing costs           1,300,000   1,600,000   1,400,000
Repayment of long term debt 1,630,621,000 1,804,578,000               6,000,000
Expiration period of the 2011 credit facility             5 years      
Outstanding borrowings                 232,000,000  
Outstanding letters of credit                 198,700,000  
Undrawn and available capacity under revolving credit facility                 469,300,000  
Undrawn capacity available for additional borrowings         $ 235,500,000