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Condensed Consolidated Balance Sheets (Parenthetical) - Limited partner - shares | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Common units |  |
Limited partner units issued (in shares) | 96,616,000 | 89,984,000
Limited partner units outstanding (in shares) | 96,616,000 | 89,984,000
Class B Units |  |
Limited partner units issued (in shares) |  | 6,398,000
Limited partner units outstanding (in shares) |  | 6,398,000

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