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Partners' Capital and Distributions - Units Outstanding (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Series A Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	69,696,542	64,388,853
Issuance of Series A preferred units in connection with in-kind distributions (units)	1,393,926	1,287,773
Outstanding, end of period (units)	71,090,468	65,676,626
Series B Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	800,000
Outstanding, end of period (units)	800,000
Common Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	725,189,138	669,194,419
Sales of common units (units)		54,119,893
Issuances of common units under LTIP (units)	17,766	90,682
Outstanding, end of period (units)	725,206,904	723,404,994

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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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

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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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