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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 |  |  |  |

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