SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage loans on real estate
Balance at the beginning of the period	$ 229,801	$ 217,529	$ 165,656
New mortgage loans		13,250	60,209
Other additions	11,913	7,435	6,925
Land conveyance			670
Amortization of mortgage premium	(4)	(10)	(6)
Collections of principal	(17,863)	(8,278)	(15,408)
Loan loss reserve	60	(125)	(517)
Balance at the end of the period	$ 223,907	$ 229,801	$ 217,529

Mortgage Loans on Real Estate, Land Conveyance

No definition available.

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- Definition

Represents the decrease in the loan loss reserve during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Total carrying amount of mortgage loans as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Period Type:	instant

- Definition

Amount of decrease in mortgage loans on real estate from amortization of premium.

+ References

+ Details

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Balance Type:	credit
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- Definition

The amount of principal collected on mortgage loans on real estate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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Data Type:	xbrli:monetaryItemType
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- Definition

Total amount of new mortgage loans on real estate during the reporting period.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Total amount of additions to mortgage loans other than new loans during the reporting period.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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