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Significant Accounting Policies (Details 2) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) reportable_segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Intangible Assets |  |  |  |
Impairment of intangible assets |  | $ 0 | $ 0 |
Goodwill |  |  |  |
Goodwill impairments | $ 0 | 0 | 0 |
Goodwill written off, sale of single-family properties |  |  | $ 400,000 |
Goodwill | 120,279,000 | 120,279,000 |  |
Allowance for Doubtful Accounts |  |  |  |
Allowance for doubtful accounts | $ 8,600,000 | $ 10,400,000 |  |
Revenue and Expense Recognition |  |  |  |
Revenue recognition period of operating lease | 1 year |  |  |
Segment Reporting |  |  |  |
Number of reportable segments | reportable_segment | 1 |  |  |
Leases |  |  |  |
Indirect leasing costs | $ 8,000,000 |  |  |
Capitalized indirect leasing costs | $ 4,000,000 |  |  |
Scenario, Forecast | ASU 2016-02 |  |  |  |
Leases |  |  |  |
Right-of-use assets |  |  |  | $ 4,800,000
Lease liability |  |  |  | $ 4,800,000
Trademark |  |  |  |
Intangible Assets |  |  |  |
Finite-lived intangible asset, useful life | 4 years 8 months 12 days |  |  |
Database |  |  |  |
Intangible Assets |  |  |  |
Finite-lived intangible asset, useful life | 7 years |  |  |

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