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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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