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Escrow Deposits, Prepaid Expenses and Other Assets - Notes Receivable (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) property | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 property | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 property | Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Note receivable, gross |  | $ 30,700 |  | $ 30,700 |  |
Unamortized discount |  | 1,200 |  | 1,200 |  |
Notes receivable |  | $ 36,706 |  | $ 36,706 |  | $ 6,012
Single Family Homes |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of real estate properties sold | property |  | 341 | 95 | 954 | 311 |
Disposal Group, Not Discontinued Operations | Bulk Portfolio Disposition | Secured Promissory Note Maturing June 2025 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Note receivable, gross | $ 30,700 |  |  |  |  |
Interest rate through October 31, 2019 | 2.70% |  |  |  |  |
Interest rate thereafter through maturity | 4.50% |  |  |  |  |
Unamortized discount |  | $ 1,000 |  | $ 1,000 |  |
Notes receivable |  | $ 29,700 |  | $ 29,700 |  |
Disposal Group, Not Discontinued Operations | Bulk Portfolio Disposition | Single Family Homes |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of real estate properties sold | property | 215 |  |  |  |  |

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- Definition The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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