SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Summary (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) item property
Mortgage loans on real estate
Number of properties \| property	21
Number of beds/units \| item	2,764
Balloon Amount	$ 198,140
Current Monthly Debt Service	1,790
Face amount of originated mortgages	227,289
Carrying Amount of Mortgages	223,907
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Michigan \| Mortgage Loans on Real Estate Maturing in 2043
Mortgage loans on real estate
Number of properties \| property	15
Number of beds/units \| item	2,055
Interest rate (as a percent)	9.53%
Balloon Amount	$ 160,165
Current Monthly Debt Service	1,470
Face amount of originated mortgages	187,165
Carrying Amount of Mortgages	$ 184,471
Michigan \| Mortgage Loans on Real Estate Maturing in 2045 \| Property with 263 Beds/Units
Mortgage loans on real estate
Number of properties \| property	2
Number of beds/units \| item	263
Interest rate (as a percent)	9.41%
Balloon Amount	$ 16,205
Current Monthly Debt Service	136
Face amount of originated mortgages	17,285
Carrying Amount of Mortgages	$ 17,112
Michigan \| Mortgage Loans on Real Estate Maturing in 2045 \| Property with 157 Beds/Units
Mortgage loans on real estate
Number of properties \| property	1
Number of beds/units \| item	157
Interest rate (as a percent)	9.41%
Balloon Amount	$ 11,816
Current Monthly Debt Service	98
Face amount of originated mortgages	12,491
Carrying Amount of Mortgages	$ 12,366
Michigan \| Mortgage Loans On Real Estate Maturing In 2020
Mortgage loans on real estate
Number of properties \| property	2
Number of beds/units \| item	205
Interest rate (as a percent)	9.41%
Balloon Amount	$ 8,948
Current Monthly Debt Service	71
Face amount of originated mortgages	8,948
Carrying Amount of Mortgages	8,858
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
UTAH \| Mortgage Loans On Real Estate Maturing in 2019
Mortgage loans on real estate
Number of properties \| property	1
Number of beds/units \| item	84
Interest rate (as a percent)	11.20%
Balloon Amount	$ 1,006
Current Monthly Debt Service	15
Face amount of originated mortgages	1,400
Carrying Amount of Mortgages	$ 1,100
Mortgage Loans \| Minimum
Mortgage loans on real estate
Interest rate (as a percent)	9.40%
General amortization schedule of mortgage loans	20 years
Mortgage Loans \| Maximum
Mortgage loans on real estate
Interest rate (as a percent)	11.20%
General amortization schedule of mortgage loans	30 years

Represents the amortization period of mortgage loan on real estate properties.

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- Definition

Represents the amount of current monthly debt service on mortgage loans on real estate.

+ References

No definition available.

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- Definition

Represents the number of owned properties.

+ References

No definition available.

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Represents the number of units or beds of owned properties.

+ References

No definition available.

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ 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)
-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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- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

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- Definition

Line items represent financial 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.

+ References

No definition available.

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- Definition

Amount of large payment to be received at final maturity date of mortgage loans.

+ 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 210.12-29.5)
-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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- Definition

Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.10(a))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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