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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 |  |  |  |  |

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