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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Significant Accounting Policies (Details 2)	3 Months Ended			12 Months Ended
Significant Accounting Policies (Details 2)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) nonperforming_loan reportable_segment	Dec. 31, 2015 USD ($) nonperforming_loan	Dec. 31, 2014 USD ($)
Intangible Assets
Impairment of intangible assets	$ 0				$ 0	$ 0
Goodwill
Goodwill impairments		$ 0	$ 0	$ 0
Goodwill written off, sale of single-family properties				400,000
Goodwill				120,279,000	120,655,000
Nonperforming Loans
Total investment				$ 200,000	$ 34,600,000
Nonperforming loans \| nonperforming_loan				3	265
Allowance for Doubtful Accounts
Allowance for doubtful accounts				$ 5,700,000	$ 3,000,000
Revenue and Expense Recognition
Revenue recognition period of operating lease				1 year
Segment Reporting
Number of reportable segments \| reportable_segment				1
Value of in-place leases
Intangible Assets
Finite-lived intangible asset, useful life				1 year
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