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Debt - Debt (Details) - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations - Mortgage notes payable - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
32 Communities Held For Sale |  |
Debt Instrument [Line Items] |  |
Mortgage debt | $ 158.6 |
15 Communities Held For Sale |  |
Debt Instrument [Line Items] |  |
Mortgage debt |  | $ 30.1

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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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