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Debt - 2016 Financings (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) community | Mar. 31, 2016 USD ($) community | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Payments of debt restructuring |  |  | $ 12.4 | $ 9.2
First Mortgage loan refinanced in March 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from debt financing |  | $ 100.0 |  |
Number of communities securing mortgage notes | community |  | 10 |  |
Weighted average interest rate |  | 4.20% |  |
Fixed interest rate first mortgage loan obtained in December 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from debt financing | $ 105.0 |  |  |
Weighted average interest rate | 4.65% |  |  | 4.65%
Repayments of debt | $ 164.4 |  |  |
Variable interest rate first mortgage loan obtained in December 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from debt financing | $ 69.6 |  |  |
Number of communities securing mortgage notes | community | 6 |  |  |
LIBOR | Variable interest rate first mortgage loan obtained in December 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate basis | 2.58% |  |  |

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- Definition The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage. + 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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