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Total Capital and Net Income (Loss) Per Unit (Details Textual)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Total Capital and Net Income Per Unit (Textual) [Abstract]    
Units held by public 61.10%  
General partners proportionate contribution 2.00%  
Exceeded cash distribution per unit 0.4625 0.4625