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PARTNERS' CAPITAL - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended												6 Months Ended	12 Months Ended
	Feb. 14, 2020	Jan. 27, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distribution Made to Member or Limited Partner
Period following quarter end for distribution of available cash																45 days
Quarterly distribution paid (in dollars per unit)			$ 0.5400	$ 0.5400	$ 0.5350	$ 0.5300	$ 0.5250	$ 0.5200	$ 0.5150	$ 0.5100	$ 0.5050	$ 0.5000	$ 0.4375	$ 0.4375
Total Cash Distribution																$ 278,425	$ 275,902	$ 240,812
Distribution declared (in dollars per unit)		$ 0.40
Quarterly distribution paid (in dollars per unit)	$ 0.40
Quarterly distribution declared		$ 50,800
Quarterly distribution paid	$ 50,800
Percentage of available cash distributed																100.00%
MGP
Distribution Made to Member or Limited Partner
Managing general partner incentive distributions (in dollars)																		$ 37,600
MGP | Excess Of $0.1375 Per Unit
Distribution Made to Member or Limited Partner
Threshold distribution of net income per unit (in dollars per unit)															$ 0.1375
General partner incentive distribution (as a percent)															15.00%
MGP | Excess Of $0.15625 Per Unit
Distribution Made to Member or Limited Partner
Threshold distribution of net income per unit (in dollars per unit)															$ 0.15625
General partner incentive distribution (as a percent)															25.00%
MGP | Excess Of $0.1875 Per Unit
Distribution Made to Member or Limited Partner
Threshold distribution of net income per unit (in dollars per unit)															$ 0.1875
General partner incentive distribution (as a percent)															50.00%

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- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

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Represents the percentage of available cash distributed to members or limited partners of an LLC or LP.

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Incentive distribution payments to which managing members or general partners are entitled, as a percentage based on amounts in excess of distributions to Limited Liability Corporation or Limited Partnership members or limited partners.

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Per-share or per-unit amount of distributions in excess of which the managing members or general partners are entitled to the specified percentage of the distribution.

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Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

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