SUMMARY OF INVESTMENTS (Unrealized Appreciation) (Details) - Continuing and Discontinuing Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in net unrealized investment appreciation
Available-for-sale fixed maturities	$ (57,475)	$ 25,573	$ (21,271)
Available-for-sale equity securities	0	40,168	34,179
Deferred policy acquisition costs	7,274	119	(4,410)
Income tax effect	10,543	(21,545)	(2,975)
Cumulative change in accounting principles	(191,244)	0	0
Accumulated effect of change in enacted tax rate	0	36,658	0
Net unrealized investment depreciation of discontinued operations, sold	6,714	0	0
Total change in net unrealized investment appreciation (depreciation), net of tax	$ (224,188)	$ 80,973	$ 5,523