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Total Capital and Net Income Per Unit (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
Director
Dec. 31, 2010
Dec. 31, 2009
Apr. 01, 2010
May 19, 2009
Total Capital and Net Income Per Unit (Textual) [Abstract]          
General partners proportionate contribution 2.00%        
Indirect general partners interest 2.00%        
Common units award to each of the four non employee directors shares 1,267        
Common units award to each of the four non employee directors value $ 50,000        
Common unit award to chairman share 2,217        
Common unit award to chairman amount $ 87,500        
Common units issued for awards   1,007 1,644    
Number of non employee directors received partnership awards 4        
Days after year-end where limited partner's have right to receive cash distribution 45 days        
Minimum percentage of holding by unitholders to remove general partner 66.67%        
Minimum Quarterly Distribution of Incentives per quarter 0.4125        
Subordinated unit converted in to common units       7,400,000 3,700,000
Common unit instrument convertible conversion price       29.95 17.66
Exceeded cash distribution per unit 0.4625