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Notes Receivable - Schedule of Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization of discount	$ 0	$ 1,075	$ 2,602
Total interest income	$ 359	3,027	6,328
Mortgage Receivable | Allerton Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual interest income		1,317	3,456
Amortization of discount		1,075	2,602
Total interest income		$ 2,392	$ 6,058

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- Definition

Investment Income, Interest, Contractual

+ References

No definition available.

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- Definition

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+ References

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- Definition

Amount of accretion of purchase discount on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(b))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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