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Partners' Capital and Distributions (Details 2) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
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, 2013
Dec. 31, 2012
Dec. 31, 2011
Partners' Capital and Distributions                              
Cash distributions per limited partner unit (in dollars per unit) $ 0.6000 $ 0.5875 $ 0.5750 $ 0.5625 $ 0.5425 $ 0.5325 $ 0.5225 $ 0.5125 $ 0.4975 $ 0.4913 $ 0.4850 $ 0.4788 $ 2.3250 $ 2.1100 $ 1.95
Cash distributions per common unit excess over MQD (in dollars per unit) $ 0.3750 $ 0.3625 $ 0.3500 $ 0.3375 $ 0.3175 $ 0.3075 $ 0.2975 $ 0.2875 $ 0.2725 $ 0.2663 $ 0.2600 $ 0.2538