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Organization and Basis of Presentation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
segment
Jun. 30, 2012
Organization and Basis of Presentation        
General partner ownership interest (as a percent) 2.00% 2.00% 2.00% 2.00%
Operating segments number     3