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Partners' Capital, Mezzanine Equity and Distributions (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands | Aug. 14, 2018 | May 15, 2018 | Feb. 14, 2018 | Nov. 14, 2017 | Aug. 14, 2017 | May 15, 2017
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Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Date Paid |  | May 15, 2018 | Feb. 14, 2018 | Nov. 14, 2017 | Aug. 14, 2017 | May 15, 2017
Per Unit Amount (in dollars per unit) |  | $ 0.5200 | $ 0.5100 | $ 0.5000 | $ 0.7225 | $ 0.7200
Total Amount |  | $ 63,741 | $ 62,515 | $ 61,290 | $ 88,563 | $ 88,257
Subsequent Event | Scenario, Forecast |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Date Paid | Aug. 14, 2018 |  |  |  |  |
Per Unit Amount (in dollars per unit) | $ 0.5300 |  |  |  |  |
Total Amount | $ 64,967 |  |  |  |  |

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- Definition Amount of cash distribution paid to unit-holder of limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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