SCHEDULE IV MORTGAGE LOANS RECEIVABLE (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]
Begining, balance	$ 23,659	$ 24,882	$ 25,635
Increase of interest receivable on mortgage loans, additions	(549)	3,011	2,738
Amounts received, deductions	(9,080)	(4,234)	(3,491)
Ending, balance	$ 14,030	$ 23,659	$ 24,882