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Equity and Distributions, Distributions (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Distributions to Partners [Abstract] |  |  |  |
Number of days after quarter end to distribute available cash |  | 45 days |  |
Number of Designated Units excluded from distributions |  |  |  | 35,380,000
Forecast [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Quarterly increase in cash distribution per unit (in dollars per unit) | $ 0.0025 |  |  |
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
Cash Distribution [Member] | First Quarter 2016 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.3950 |
Record Date |  |  | Apr. 29, 2016 |
Payment Date |  |  | May 06, 2016 |
Cash Distribution [Member] | Second Quarter 2016 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4000 |
Record Date |  |  | Jul. 29, 2016 |
Payment Date |  |  | Aug. 05, 2016 |
Cash Distribution [Member] | Third Quarter 2016 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4050 |
Record Date |  |  | Oct. 31, 2016 |
Payment Date |  |  | Nov. 07, 2016 |
Cash Distribution [Member] | Fourth Quarter 2016 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4100 |
Record Date |  |  | Jan. 31, 2017 |
Payment Date |  |  | Feb. 07, 2017 |
Cash Distribution [Member] | First Quarter 2017 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4150 |  |
Record Date |  | Apr. 28, 2017 |  |
Payment Date |  | May 08, 2017 |  |
Cash Distribution [Member] | Second Quarter 2017 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4200 |  |
Record Date |  | Jul. 31, 2017 |  |
Payment Date |  | Aug. 07, 2017 |  |
Cash Distribution [Member] | Third Quarter 2017 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4225 |  |
Record Date |  | Oct. 31, 2017 |  |
Payment Date |  | Nov. 07, 2017 |  |
Cash Distribution [Member] | Fourth Quarter 2017 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4250 |  |
Record Date |  | Jan. 31, 2018 |  |
Payment Date |  | Feb. 07, 2018 |  |
Cash Distribution [Member] | Forecast [Member] | First Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) | 0.4275 |  |  |
Cash Distribution [Member] | Forecast [Member] | Second Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) | 0.4300 |  |  |
Cash Distribution [Member] | Forecast [Member] | Third Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) | 0.4325 |  |  |
Cash Distribution [Member] | Forecast [Member] | Fourth Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 0.4350 |  |  |

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