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Partners' Capital and Distributions - Units Outstanding (Details) - shares | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Series A Preferred Units |  |  |  |  |  |
Activity for preferred units and common units |  |  |  |  |  |
Outstanding, beginning of period (units) | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 69,696,542
Issuance of Series A preferred units in connection with in-kind distribution (units) |  |  |  |  |  | 1,393,926
Outstanding, end of period (units) | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468
Series B Preferred Units |  |  |  |  |  |
Activity for preferred units and common units |  |  |  |  |  |
Outstanding, beginning of period (units) | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000
Outstanding, end of period (units) | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000
Common Units |  |  |  |  |  |
Activity for preferred units and common units |  |  |  |  |  |
Outstanding, beginning of period (units) | 727,424,619 | 726,785,813 | 726,361,924 | 725,582,739 | 725,206,904 | 725,189,138
Issuances of common units under equity-indexed compensation plans | 603,957 | 638,806 | 423,889 | 505,650 | 375,835 | 17,766
Outstanding, end of period (units) | 728,028,576 | 727,424,619 | 726,785,813 | 726,088,389 | 725,582,739 | 725,206,904

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- Definition Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners. + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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