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Consolidated Statement of Equity (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class A common shares/units |  |  |  |  |
Offering costs | $ 9,200 | $ 400 | $ 10,637 | $ 227 | $ 0
Common Stock | Class A common shares/units |  |  |  |  |
Offering costs |  |  | 10,904 |  |
Preferred shares |  |  |  |  |
Offering costs |  |  | $ 9,355 | $ 15,996 |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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