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Partners' Capital and Distributions - Units Outstanding (Details) - shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 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 | 2,601,300
Outstanding, end of period (units) | 71,090,468 | 66,990,153
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) | 393,601 | 130,154
Outstanding, end of period (units) | 725,582,739 | 724,696,735

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- Definition Number of units distributed for payment of a unit distribution to unit-holder of limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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