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Significant Accounting Policies (Details 2)		12 Months Ended
	Dec. 31, 2014 USD ($) nonperforming_loan	Dec. 31, 2015 USD ($) nonperforming_loan reportable_segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Intangible Assets
Impairment of intangible assets		$ 0	$ 0	$ 0
Goodwill
Goodwill impairments		0	0	$ 0
Nonperforming Loans
Total investment	$ 50,400,000	$ 34,600,000	50,400,000
Nonperforming loans | nonperforming_loan	352	265
Allowance for Doubtful Accounts
Allowance for doubtful accounts	$ 500,000	$ 3,000,000	500,000
Rescinded Properties
Rescission receivables	$ 1,100,000	$ 0	$ 1,100,000
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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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