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Equity and Distributions, Distributions (Details) - Cash Distribution [Member] - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018
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 |
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 |  |
Forecast [Member] | Second Quarter 2018 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | $ 0.4300
Forecast [Member] | Third Quarter 2018 Distribution [Member] |  |  |
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  |  | 0.4325
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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