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Partners' Capital and Distributions (Details 2) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Partners' Capital and Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distributions per common unit (in dollars per unit) | $ 0.5425 | $ 0.5325 | $ 0.5225 | $ 0.5125 | $ 0.4975 | $ 0.4913 | $ 0.4850 | $ 0.4788 | $ 0.4750 | $ 0.4713 | $ 0.4675 | $ 0.4638 | $ 2.1100 | $ 1.9525 | $ 1.88
Cash distributions per common unit excess over MQD (in dollars per unit) | $ 0.3175 | $ 0.3075 | $ 0.2975 | $ 0.2875 | $ 0.2725 | $ 0.2663 | $ 0.2600 | $ 0.2538 | $ 0.2500 | $ 0.2463 | $ 0.2425 | $ 0.2388 |  |  |

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- Definition The per-unit cash dividend declared or paid to a common shareholder or a unit-holder by a LLC or LP in excess of the minimum distribution level. + References No definition available. + Details
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- Definition Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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