INVESTMENTS - Disposition of Fixed Securities and Equities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt securities | Available for sale securities | SALES
Summary of the disposition of fixed maturities and equities
Proceeds From Sales	$ 196,799	$ 394,318	$ 169,002
Gross Realized Gains	4,368	3,131	2,406
Gross Realized Losses	(2,167)	(5,349)	(1,670)
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total	2,201	(2,218)	736
Debt securities | Available for sale securities | CALLS/MATURITIES
Summary of the disposition of fixed maturities and equities
Proceeds From Sales	201,698	187,380	195,617
Gross Realized Gains	1,004	311	262
Gross Realized Losses	(21)	(111)	(139)
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total	983	200	123
Equity securities | SALES
Summary of the disposition of fixed maturities and equities
Proceeds From Sales	62,172	147,838	36,573
Gross Realized Gains	16,938	71,065	13,178
Gross Realized Losses	(2,493)	(1,197)	(2,896)
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total	$ 14,445	$ 69,868	$ 10,282