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PARTNERS' CAPITAL - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 6 Months Ended | 12 Months Ended
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Feb. 14, 2020 | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019 | Feb. 14, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
PARTNERS' CAPITAL |  |  |  |  |  |  |  |
Quarterly distribution paid (in dollars per unit) | $ 0.4000 | $ 0.5400 | $ 0.5400 | $ 0.5350 | $ 0.5300 | $ 0.4000 |  | $ 2.1450
Total Cash Distribution | $ 51,753 | $ 69,772 | $ 70,153 | $ 69,489 | $ 69,011 | $ 51,753 | $ 138,500 | $ 278,425

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- Definition Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP). + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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