Real Estate Investments - Mortgage Loans - Scheduled Principal Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans
Carrying value of mortgage loans	$ 223,907	$ 229,801
Mortgage Loans
Mortgage Loans
Carrying value of mortgage loans	223,907	$ 229,801
Scheduled principal payments on mortgage loan receivables
2018	1,077
2019	2,124
2020	8,815
2021	1,065
2022	1,065
Thereafter	212,016
Total	$ 226,162

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- References

No definition available.

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- Definition

Represents the scheduled principal payment after year five following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

Represents the scheduled principal payment within one year following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

Represents the total scheduled principal payments receivable for mortgage loans on real estate.

+ References

No definition available.

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- Definition

Represents the scheduled principal payment in year five following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

Represents the scheduled principal payment in year four following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

Represents the scheduled principal payment in year three following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

Represents the scheduled principal payment in year two following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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