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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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