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Partners' Capital and Distributions - Units Outstanding (Details) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 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	3,941,096
Outstanding, end of period (units)	71,090,468	68,329,949
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
Issuance of common units in connection with acquisition of interest in Advantage Joint Venture (units)		1,252,269
Other (units)	899,251	622,557
Outstanding, end of period (units)	726,088,389	725,189,138

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- Definition

Changes in the number of units outstanding included in the statement of changes in partners' capital which are not separately disclosed or provided for elsewhere in the taxonomy.

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

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The number of limited partner units outstanding.

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

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