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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - CONDENSED BALANCE SHEETS (Parenthetical) (Details) - shares | Dec. 31, 2020 | Dec. 31, 2019
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Condensed Financial Statements, Captions [Line Items] |  |
Common units outstanding | 127,195,219 | 126,915,597
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Common units outstanding | 127,195,219 | 126,915,597

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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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