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PARTNERS' EQUITY Narrative 1 (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Issuances Of Common Units [Line Items]        
Net proceeds $ 344,076 $ 3,391 $ 344,076 $ 3,391
September 2012 Equity Issuance [Member]
       
Issuances Of Common Units [Line Items]        
Date of issuance     Sep. 10, 2012  
Number of common units issued     7,130,000  
Price per unit     $ 48.94  
Net proceeds     344,100  
General Partner [Member] | September 2012 Equity Issuance [Member]
       
Issuances Of Common Units [Line Items]        
Net proceeds     $ 7,100