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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 |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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