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Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2017	Dec. 31, 2016
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

X

- Definition

The number of limited partner units issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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

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X

- Definition

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+ 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 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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