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Equity and Distributions, Distributions (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Distributions to Partners [Abstract] |  |  |
Number of Designated Units excluded from distributions | 35,380,000 | 45,120,000 | 47,400,000
Cash Distribution [Member] | First Quarter 2014 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.3550 |
Record Date |  | Apr. 30, 2014 |
Payment Date |  | May 07, 2014 |
Cash Distribution [Member] | Second Quarter 2014 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.3600 |
Record Date |  | Jul. 31, 2014 |
Payment Date |  | Aug. 07, 2014 |
Cash Distribution [Member] | Third Quarter 2014 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.3650 |
Record Date |  | Oct. 31, 2014 |
Payment Date |  | Nov. 07, 2014 |
Cash Distribution [Member] | Fourth Quarter 2014 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.3700 |
Record Date |  | Jan. 30, 2015 |
Payment Date |  | Feb. 06, 2015 |
Cash Distribution [Member] | First Quarter 2015 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.3750 |  |
Record Date | Apr. 30, 2015 |  |
Payment Date | May 07, 2015 |  |
Cash Distribution [Member] | Second Quarter 2015 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.3800 |  |
Record Date | Jul. 31, 2015 |  |
Payment Date | Aug. 07, 2015 |  |
Cash Distribution [Member] | Third Quarter 2015 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.3850 |  |
Record Date | Oct. 30, 2015 |  |
Payment Date | Nov. 06, 2015 |  |
Cash Distribution [Member] | Fourth Quarter 2015 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.3900 |  |
Record Date | Jan. 29, 2016 |  |
Payment Date | Feb. 05, 2016 |  |

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