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LONG-TERM DEBT (Details 2) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
4.25% convertible senior notes due June 2014
Mar. 31, 2011
4.25% convertible senior notes due June 2014
Dec. 31, 2011
4.25% convertible senior notes due June 2014
Jun. 30, 2009
4.25% convertible senior notes due June 2014
Jun. 29, 2009
4.25% convertible senior notes due June 2014
Mar. 31, 2012
Partnership's revolving credit facility due November 2015
Mar. 31, 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
Mar. 31, 2011
Asset Backed Securitization Facility
Long-term Debt                        
Increases revolving borrowing facility               $ 200,000,000        
Revolving credit facility borrowing capacity               750,000,000 750,000,000 900,000,000 900,000,000  
Transaction costs 525,000 980,000             500,000      
Decrease in revolving borrowing facility                   200,000,000    
Write-off of deferred financing costs                     1,300,000 1,400,000
Repayment of long term debt 913,048,000 766,961,000                   6,000,000
Interest rate (as a percent)     4.25%   4.25% 4.25%            
Initial conversion rate of debt instrument           43.1951            
Principal amount of the convertible notes           1,000            
Initial conversion price per common stock shares (in dollars per share)           $ 23.15            
Debt discount     49,900,000   54,900,000 97,900,000            
Recognized interest expense related to the contractual interest coupon     3,800,000 3,800,000                
Recognized interest expense related to amortization of the debt discount 4,960,000 4,416,000 5,000,000 4,400,000                
Effective interest rate (as a percent)     11.67%                  
Outstanding borrowings                   275,000,000 275,000,000  
Letters of credit outstanding                   201,100,000 201,100,000  
Undrawn capacity under revolving credit facility                   423,900,000 423,900,000  
Required maximum ratio of Total Debt to Adjusted EBITDA                     5.0  
Undrawn capacity available for additional borrowings               264,500,000 264,500,000 400,800,000 400,800,000  
Principle amount of senior notes             $ 355,000,000