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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Series A Preferred Units |  |  |  |
Units outstanding (units) | 71,090,468 | 69,696,542 | 65,676,626 | 64,388,853
Series B Preferred Units |  |  |  |
Units outstanding (units) | 800,000 | 800,000 |  |
Common Units |  |  |  |
Units outstanding (units) | 725,206,904 | 725,189,138 | 723,404,994 | 669,194,419

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- Definition The number of limited partner units outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=27012166&loc=d3e187171-122770 + Details
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