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Debt - 2018 Financings/Convertible Debt (Details) $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 15, 2018 USD ($) | Apr. 30, 2018 USD ($) community | Dec. 31, 2017 USD ($) | Jun. 30, 2011 USD ($)
Debt Instrument [Line Items] |  |  |  |
Number of communities expected to be acquired | community |  | 5 |  |
Mortgage notes payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of principal bearing fixed rate |  | 60.00% |  |
Fixed rate |  | 4.55% |  |
Percentage of principal bearing variable rate |  | 40.00% |  |
Mortgage notes payable | Non-Recourse Supplemental Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 247.6 |  |
Mortgage notes payable | Mortgage Debt Due May 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of debt |  | $ 43.0 |  |
Secured debt | Non-Recourse First Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of communities securing debt | community |  | 11 |  |
Convertible notes payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  | $ 316.3 |
Convertible notes payable | Convertible Senior Notes Due June 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 316.3
Fixed rate |  |  |  | 2.75%
Extinguishment of debt | $ 316.3 |  |  |
LIBOR | Mortgage notes payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate basis |  | 1.89% |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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