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Consolidated Balance Sheets (Parenthetical) - shares | Dec. 31, 2017 | Dec. 31, 2016
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Series A Preferred Stock [Member] |  |
Partners' capital: |  |
Limited partner interest, units issued (in shares) | 12,000,000 | 0
Limited partner interest, units outstanding (in shares) | 12,000,000 | 0
Common Units - Public [Member] |  |
Partners' capital: |  |
Limited partner interest, units issued (in shares) | 53,917,173 | 52,430,220
Limited partner interest, units outstanding (in shares) | 53,917,173 | 52,430,220
Common Units Affiliated [Member] |  |
Partners' capital: |  |
Limited partner interest, units issued (in shares) | 45,750,826 | 45,750,826
Limited partner interest, units outstanding (in shares) | 45,750,826 | 45,750,826
Class C Units Subsidiary [Member] |  |
Partners' capital: |  |
Limited partner interest, units issued (in shares) | 16,410,780 | 16,410,780
Limited partner interest, units outstanding (in shares) | 16,410,780 | 16,410,780

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