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Equity and Distributions, Distributions (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Mar. 31, 2014 Cash Distribution [Member] First Quarter 2014 Distribution [Member] | Jun. 30, 2014 Cash Distribution [Member] First Quarter 2014 Distribution [Member] | Jun. 30, 2014 Cash Distribution [Member] Second Quarter 2014 Distribution [Member] | Jun. 30, 2014 Cash Distribution [Member] Second Quarter 2014 Distribution [Member] | Mar. 31, 2013 Cash Distribution [Member] First Quarter 2013 Distribution [Member] | Jun. 30, 2014 Cash Distribution [Member] First Quarter 2013 Distribution [Member] | Jun. 30, 2013 Cash Distribution [Member] Second Quarter 2013 Distribution [Member] | Jun. 30, 2014 Cash Distribution [Member] Second Quarter 2013 Distribution [Member]
Distributions to Partners [Abstract] |  |  |  |  |  |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.7100 |  | $ 0.7200 |  | $ 0.6700 |  | $ 0.6800 |
Record Date |  |  | Apr. 30, 2014 |  | Jul. 31, 2014 |  | Apr. 30, 2013 |  | Jul. 31, 2013
Payment Date |  |  | May 07, 2014 |  | Aug. 07, 2014 |  | May 07, 2013 |  | Aug. 07, 2013
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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