INVESTMENTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Investment balances
Cost			$ 50,681
Gross Unrealized Gains		$ 678
Gross Unrealized Losses		(35)
Estimated Market Value	$ 71,003		51,324
Money market funds
Investment balances
Cost	9,978		9,736
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Market Value	9,978		9,736
Equity funds
Investment balances
Cost	9,333		11,578
Gross Unrealized Gains	545	657
Gross Unrealized Losses	(164)	$ (20)
Estimated Market Value	$ 9,714		$ 12,215