SUMMARY OF INVESTMENTS (Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Other	$ 252	$ 307	$ 300
Total investment income from continuing operations	67,395	60,554	57,495
Less investment expenses	6,981	7,660	6,305
Net investment income from continuing operations	60,414	52,894	51,190
Discontinued Operations
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income from continuing operations	0	12,663	49,720
Continuing and Discontinuing Operations
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income from continuing operations	60,414	65,557	100,910
Fixed Maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	50,274	51,356	44,784
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	7,842	7,731	7,108
Other long-term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	3,115	8,383	6,870
Other long-term investments | Change in Value
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Other	1,114	(10,116)	(2,812)
Collateralized Mortgage Backed Securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	1,595	412	0
Short-term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	522	606	120
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 2,681	$ 1,875	$ 1,125