SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Summary (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) loan item property
Mortgage loans on real estate
Number of properties | property	38
Number of beds/units | item	4,164
Balloon Amount	$ 185,594
Current Monthly Debt Service	1,905
Face Amount of Mortgages	220,767
Carrying Amount of Mortgages	$ 217,529
Amortization period of mortgage loans	30 years
Number of first-lien mortgage loans | loan	19
Michigan | Mortgage Loans on Real Estate Maturing in 2043 [Member]
Mortgage loans on real estate
Number of properties | property	15
Number of beds/units | item	2,058
Interest rate (as a percent)	9.53%
Balloon Amount	$ 146,983
Current Monthly Debt Service	1,371
Face Amount of Mortgages	164,387
Carrying Amount of Mortgages	$ 174,653
Michigan | Mortgage Loan on Real Estate Maturing in 2045 [Member]
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	$ 8,825
Current Monthly Debt Service	74
Face Amount of Mortgages	9,500
Carrying Amount of Mortgages	$ 9,806
Michigan | Mortgage Loans on Real Estate Maturing in 2045 [Member]
Mortgage loans on real estate
Number of properties | property	2
Number of beds/units | item	273
Interest rate (as a percent)	9.41%
Balloon Amount	$ 8,420
Current Monthly Debt Service	74
Face Amount of Mortgages	9,500
Carrying Amount of Mortgages	$ 9,500
Various | Mortgage Loans on Real Estate Maturing Between 2016 to 2019
Mortgage loans on real estate
Number of properties | property	20
Number of beds/units | item	1,676
Balloon Amount	$ 21,366
Current Monthly Debt Service	386
Face Amount of Mortgages	37,380
Carrying Amount of Mortgages	$ 23,570