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Equity and Distributions, Distributions (Details) - Cash Distribution [Member] - $ / shares	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 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
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
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
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
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
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
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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Date of record for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format.

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