SCHEDULE IV (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Number of Loans	[1]	2
Non-recourse first mortgage loan Face Amount, Total mortgage		$ 4,581
Carrying Amount of Mortgages	[2],[3]	4,581
Principal Amount of Loans Subject to Delinquent Principal or Interest	[4]	0
Changes in the mortgage loans [Roll Forward]
Income Tax Basis of Mortgage Loans on Real Estate		$ 4,580
First Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Final Maturity Date		Dec. 21, 2022	Oct. 25, 2017
Effective interest rate (in hundredths)		5.15%	5.25%
Changes in the mortgage loans [Roll Forward]
Balance at beginning of year		$ 4,752	$ 4,875	$ 4,991
Payments on mortgage loans receivable		(171)	(123)	(116)
Balance at end of year		$ 4,581	$ 4,752	$ 4,875
JCB Limited - California - A [Member] | First Mortgage [Member] | Buildings [Member]
Mortgage Loans on Real Estate [Line Items]
Number of Loans		1
Stated interest rate (in hundredths)		5.15%
Mortgage Loans on Real Estate, Final Maturity Date		Dec. 21, 2022
Periodic Payment Terms		Principal and interest due monthly
Non-recourse first mortgage loan Face Amount, Total mortgage		$ 1,826
Carrying Amount of Mortgages		1,826
Principal Amount of Loans Subject to Delinquent Principal or Interest	[4]	$ 0
JCB Limited - California - B [Member] | First Mortgage [Member] | Buildings [Member]
Mortgage Loans on Real Estate [Line Items]
Number of Loans		1
Stated interest rate (in hundredths)		5.15%
Mortgage Loans on Real Estate, Final Maturity Date		Dec. 21, 2022
Periodic Payment Terms		Principal and interest due monthly
Non-recourse first mortgage loan Face Amount, Total mortgage		$ 2,755
Carrying Amount of Mortgages		2,755
Principal Amount of Loans Subject to Delinquent Principal or Interest	[4]	$ 0

[1] Reference is made to allowance for possible losses on mortgage loans receivable in the Notes to Consolidated Financial Statements.

[2] Changes in mortgage loans follow: Years Ended December 31,2017 2016 2015(In thousands)Balance at beginning of year$4,752 4,875 4,991Payments on mortgage loans receivable(171) (123) (116)Balance at end of year$4,581 4,752 4,875

[3] The aggregate cost for federal income tax purposes is approximately $4.58 million. The federal income tax return for the year ended December 31, 2017, has not been filed and, accordingly, the income tax basis of mortgage loans as of December 31, 2017, is based on preliminary data.

[4] Interest in arrears for three months or less is disregarded in computing principal amount of loans subject to delinquent interest.