Partners' Capital and Distributions - Units Outstanding (Details) - shares	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Series A Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	64,388,853
Outstanding, end of period (units)	65,676,626
Series A Preferred Units \| Limited Partners \| Partners’ Capital Excluding Noncontrolling Interests
Activity for preferred units and common units
Outstanding, beginning of period (units)	64,388,853	0
Issuance of preferred units in connection with in-kind distributions (units)	1,287,773
Sale of preferred units (units)		61,030,127
Outstanding, end of period (units)	65,676,626	61,030,127
Common Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	669,194,419
Sales of common units (units)	54,119,893
Outstanding, end of period (units)	723,404,994
Common Units \| Limited Partners \| Partners’ Capital Excluding Noncontrolling Interests
Activity for preferred units and common units
Outstanding, beginning of period (units)	669,194,419	397,727,624
Sales of common units (units)	54,119,893
Issuance of common units under LTIP (units)	90,682	3,367
Outstanding, end of period (units)	723,404,994	397,730,991

Number of units distributed for payment of a unit distribution to unit-holder of limited partnership (LP).

Reference 1: 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 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 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The number of limited partner units outstanding.

+ 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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- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

+ References

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- Definition

The number of units sold in a private placement of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ 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 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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