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Equity Percentage Allocations of Available Cash from Operating Surplus (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
General partner's ownership interest | 2.00% | 2.00% | 2.00%
Minimum Quarterly Distribution |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.37500 |  |
Minimum Quarterly Distribution | Limited Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 98.00% |  |
Minimum Quarterly Distribution | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 2.00% |  |
First Target Distribution | Limited Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 98.00% |  |
First Target Distribution | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 2.00% |  |
First Target Distribution | Minimum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.37500 |  |
First Target Distribution | Maximum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.43125 |  |
Second Target Distribution | Limited Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 85.00% |  |
Second Target Distribution | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 15.00% |  |
Second Target Distribution | Minimum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.43125 |  |
Second Target Distribution | Maximum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.46875 |  |
Third Target Distribution | Limited Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 75.00% |  |
Third Target Distribution | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 25.00% |  |
Third Target Distribution | Minimum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.46875 |  |
Third Target Distribution | Maximum |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | 0.56250 |  |
Thereafter |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution payment targets | $ 0.56250 |  |
Thereafter | Limited Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 50.00% |  |
Thereafter | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 50.00% |  |

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- Definition Percentage split between the limited partners' and general partner's interests in distributions. + References No definition available. + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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