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Notes Receivable - Schedule of Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 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 + Details
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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 + Details
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