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Equity and Distributions, Distributions (Details) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Cash Distribution [Member] | Sep. 30, 2012 Cash Distribution [Member] | Jun. 30, 2012 Cash Distribution [Member] | Mar. 31, 2012 Cash Distribution [Member] | Dec. 31, 2011 Cash Distribution [Member] | Sep. 30, 2011 Cash Distribution [Member] | Jun. 30, 2011 Cash Distribution [Member] | Mar. 31, 2011 Cash Distribution [Member]
Distributions to Partners [Abstract] |  |  |  |  |  |  |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.6600 | $ 0.6500 | $ 0.6350 | $ 0.6275 | $ 0.6200 | $ 0.6125 | $ 0.6050 | $ 0.5975
Record Date |  |  | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 29, 2011 | Apr. 29, 2011
Payment Date |  |  | Feb. 07, 2013 | Nov. 08, 2012 | Aug. 08, 2012 | May 09, 2012 | Feb. 09, 2012 | Nov. 09, 2011 | Aug. 10, 2011 | May 06, 2011
Number of Designated Units (in units) | 26,130,000 | 30,610,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |

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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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