MORTGAGE LOANS RECEIVABLE (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2017 USD ($)	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	[1],[2]	$ 4,581
Mortgage recourse loan		$ 4,581
First Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Number of mortgage loans receivable		2	2
Effective interest rate (in hundredths)		5.15%	5.25%
Mortgage Loans on Real Estate, Final Maturity Date		Dec. 21, 2022	Oct. 25, 2017

[1] 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

[2] 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.