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Equity and Distributions, Distributions (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Distributions to Partners [Abstract] |  |
Number of Designated Units to be excluded from distributions during 2011 | 30,610,000 |
Number of Designated Units to be excluded from distributions during 2012 | 26,130,000 |
Number of Designated Units to be excluded from distributions during 2013 | 23,700,000 |
Number of Designated Units to be excluded from distributions during 2014 | 22,560,000 |
Number of Designated Units to be excluded from distributions during 2015 | 17,690,000 |
Cash Distribution [Member] | First Quarter Distribution [Member] |  |
Distributions to Partners [Abstract] |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.6700 | $ 0.6275
Record Date | Apr. 30, 2013 | Apr. 30, 2012
Payment Date | May 07, 2013 | May 09, 2012
Cash Distribution [Member] | Second Quarter Distribution [Member] |  |
Distributions to Partners [Abstract] |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.6800 | $ 0.6350
Record Date | Jul. 31, 2013 | Jul. 31, 2012
Payment Date | Aug. 07, 2013 | Aug. 08, 2012
Cash Distribution [Member] | Third Quarter Distribution [Member] |  |
Distributions to Partners [Abstract] |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.6900 | $ 0.6500
Record Date | Oct. 31, 2013 | Oct. 31, 2012
Payment Date | Nov. 07, 2013 | Nov. 08, 2012
Cash Distribution [Member] | Fourth Quarter Distribution [Member] |  |
Distributions to Partners [Abstract] |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.7000 | $ 0.6600
Record Date | Jan. 31, 2014 | Jan. 31, 2013
Payment Date | Feb. 07, 2014 | Feb. 07, 2013

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- Definition The number of common units outstanding (the Designated Units) on which a private held affiliate agreed to temporarily waive regular quarterly cash distributions it would otherwise receive, for a five-year period after the merger beginning November 22, 2010. + References No definition available. + Details
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