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PARTNERS' CAPITAL - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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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 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. + References No definition available. + Details
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