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Partners' Capital and Distributions - Units Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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)	66,990,153
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
Issuances of preferred units in connection with in-kind distributions (units)	2,601,300	858,439
Sale of preferred units (units)		61,030,127
Outstanding, end of period (units)	66,990,153	61,888,566
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)	724,696,735
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 in connection with acquisition of interest in Advantage Joint Venture (Note 6) (units)	1,252,269
Issuances of common units under LTIP (units)	130,154	9,104
Outstanding, end of period (units)	724,696,735	397,736,728

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- Definition

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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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.

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Number of shares of stock issued during the period pursuant to acquisitions.

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