INVESTMENTS (Major Categories of Investment Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 453	$ 75	$ 125	$ 312
Fixed maturities
Gain (Loss) on Investments [Line Items]
Net realized investment gains	27	75	156	310
Change in fair value of equity securities
Gain (Loss) on Investments [Line Items]
Net realized investment gains	426	0	57	0
Other, principally real estate
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 0	$ 0	$ (88)	$ 2