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Equity and Distributions, Distributions (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Distributions to Partners [Abstract] |  |  |  |
Number of days after quarter end to distribute available cash |  | 45 days |  |
Cash Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 1.7650 |  |
Quarterly increase in cash distribution per unit (in dollars per unit) |  | 0.0025 |  |
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] | First Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4275 |
Record Date |  |  | Apr. 30, 2018 |
Payment Date |  |  | May 08, 2018 |
Cash Distribution [Member] | Second Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4300 |
Record Date |  |  | Jul. 31, 2018 |
Payment Date |  |  | Aug. 08, 2018 |
Cash Distribution [Member] | Third Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4325 |
Record Date |  |  | Oct. 31, 2018 |
Payment Date |  |  | Nov. 08, 2018 |
Cash Distribution [Member] | Fourth Quarter 2018 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4350 |
Record Date |  |  | Jan. 31, 2019 |
Payment Date |  |  | Feb. 08, 2019 |
Cash Distribution [Member] | First Quarter 2019 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4375 |  |
Record Date |  | Apr. 30, 2019 |  |
Payment Date |  | May 13, 2019 |  |
Cash Distribution [Member] | Second Quarter 2019 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4400 |  |
Record Date |  | Jul. 31, 2019 |  |
Payment Date |  | Aug. 13, 2019 |  |
Cash Distribution [Member] | Third Quarter 2019 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4425 |  |
Record Date |  | Oct. 31, 2019 |  |
Payment Date |  | Nov. 12, 2019 |  |
Cash Distribution [Member] | Fourth Quarter 2019 Distribution [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.4450 |  |
Record Date |  | Jan. 31, 2020 |  |
Payment Date |  | Feb. 12, 2020 |  |
Cash Distribution [Member] | Forecast [Member] |  |  |  |
Distributions to Partners [Abstract] |  |  |  |
Distribution Per Common Unit (in dollars per unit) | $ 1.8050 |  |  |
Forecasted rate of annual increase of distributions per unit | 2.30% |  |  |

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