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v3.19.2

Partners' Capital and Distributions - Units Outstanding (Details) - shares | 3 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | 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 | 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
Series B Preferred Units |  |  |  |
Activity for preferred units and common units |  |  |  |
Outstanding, beginning of period (units) | 800,000 | 800,000 | 800,000 | 800,000
Outstanding, end of period (units) | 800,000 | 800,000 | 800,000 | 800,000
Common Units |  |  |  |
Activity for preferred units and common units |  |  |  |
Outstanding, beginning of period (units) | 726,785,813 | 726,361,924 | 725,206,904 | 725,189,138
Issuances of common units under equity-indexed compensation plans | 638,806 | 423,889 | 375,835 | 17,766
Outstanding, end of period (units) | 727,424,619 | 726,785,813 | 725,582,739 | 725,206,904

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