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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 06, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Distribution Made To Limited Partner Cash Distributions Paid |  | $ 66,857 | $ 66,856 | $ 62,207
Distribution 4 - FY 2017 |  |  |  |
Distribution Made To Limited Partner And General Partner Declaration Date |  | Jan. 01, 2018 |  |
Distributions paid, Per unit |  | $ 0.4225 |  |
Distribution Made To Limited Partner Cash Distributions Paid |  | $ 15,000 |  |
Distribution Made To Limited And General Partner Distribution Date |  | Jan. 18, 2018 |  |
Distribution Made To Limited And General Partner Date Record |  | Jan. 11, 2018 |  |
Distribution from November 12, 2017 to February 11, 2018 | Series A Preferred |  |  |  |
Distribution Made To Limited Partner And General Partner Declaration Date |  | Jan. 19, 2018 |  |
Distributions paid, Per unit |  | $ 0.5625 |  |
Distribution Made To Limited And General Partner Distribution Date |  | Feb. 12, 2018 |  |
Distribution Made To Limited And General Partner Date Record |  | Feb. 05, 2018 |  |
Subsequent Event | Clean Horizon and Clean Vision | Extension of the purchase option exercise deadline |  |  |  |
Purchase option period, Expiration date | Dec. 31, 2018 |  |  |

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- Definition Amount of cash distribution paid to unit-holder of limited partnership (LP). + References Reference 1: 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 2: 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 Reference 3: 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 + Details
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