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Partners' Capital, Mezzanine and Equity Distributions (Distributions Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands | Feb. 14, 2018 | Nov. 14, 2017 | Aug. 14, 2017 | May 15, 2017 | Feb. 14, 2017 | Nov. 14, 2016 | Aug. 12, 2016 | May 13, 2016 | Feb. 12, 2016 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jun. 30, 2017 | [1] | Mar. 31, 2017 | [1] | Dec. 31, 2016 | [1] | Sep. 30, 2016 | [1] | Jun. 30, 2016 | [1] | Mar. 31, 2016 | [1]
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Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid |  | Nov. 14, 2017 | Aug. 14, 2017 | May 15, 2017 | Feb. 14, 2017 | Nov. 14, 2016 | Aug. 12, 2016 | May 13, 2016 | Feb. 12, 2016 |  |  |  |  |  |  |  |
Per Unit Amount (in dollars per share) |  | $ 0.5000 | $ 0.7225 | $ 0.7200 | $ 0.7100 | $ 0.7000 | $ 0.6900 | $ 0.6725 | $ 0.6550 | $ 0.5000 | $ 0.7225 | $ 0.7200 | $ 0.7100 | $ 0.7000 | $ 0.6900 | $ 0.6725 | $ 0.6550
Total Amount |  | $ 61,290 | $ 88,563 | $ 88,257 | $ 83,765 | $ 82,585 | $ 81,406 | $ 73,961 | $ 72,036 |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid | Feb. 14, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per Unit Amount (in dollars per share) | $ 0.5100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Amount | $ 62,515 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | (1)Represents cash distributions declared and paid in the applicable period.

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- Definition Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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