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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Series A Preferred Units |  |  |  |  |  |  |  |
Units outstanding (units) | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468
Series B Preferred Units |  |  |  |  |  |  |  |
Units outstanding (units) | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000
Common Units |  |  |  |  |  |  |  |
Units outstanding (units) | 728,476,591 | 728,100,398 | 728,053,007 | 728,028,576 | 728,028,576 | 727,424,619 | 726,785,813 | 726,361,924

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- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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