INVESTMENTS (Gross Unrealized Losses and Related Fair Values for Debt and Equity Securities, Grouped by Duration of Time in Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value [Abstract]
Less than 12 Months	$ 235	$ 0
12 Months or Longer, Fair Value	2,222	2,287
Total	2,457	2,287
Gross unrealized loss position [Abstract]
Less than 12 Months	6	0
12 Months or Longer, Accumulated Loss	65	39
Total	71	39
Total Investments, excluding equity securities, less than 12 months, Fair Value	137,510	76,371
Total Investments, excluding equity securities, Less than 12 Months, Gross Unrealized Losses	6,877	535
Total Investments, excluding equity securities, 12 months or longer, Fair Value	2,622	12,378
Total Investments, excluding equity securities, 12 months or longer, Gross Unrealized Losses	303	96
Total Investments, excluding equity securities, Total Fair Value	140,132	88,749
Total Investments, excluding equity securities, Total Gross Unrealized Losses	7,180	631
United States Government Obligations and Authorities
Fair value [Abstract]
Less than 12 months	810	49,833
12 Months or Longer	268	2,218
Total	1,078	52,051
Gross unrealized losses [Abstract]
Less than 12 months	1	409
12 Months or Longer	12	17
Total	13	426
Fair Value [Abstract]
Less than 12 Months	0	0
12 Months or Longer, Fair Value	2,222	2,287
Total	2,222	2,287
Gross unrealized loss position [Abstract]
Less than 12 Months	0	0
12 Months or Longer, Accumulated Loss	65	39
Total	65	39
Obligations of States and Political Subdivisions
Fair value [Abstract]
Less than 12 months	5,544	6,810
12 Months or Longer	0	0
Total	5,544	6,810
Gross unrealized losses [Abstract]
Less than 12 months	37	22
12 Months or Longer	0	0
Total	37	22
Corporate
Fair value [Abstract]
Less than 12 months	117,591	15,872
12 Months or Longer	0	7,694
Total	117,591	23,566
Gross unrealized losses [Abstract]
Less than 12 months	5,754	94
12 Months or Longer	188	38
Total	5,942	132
Fair Value [Abstract]
Less than 12 Months	235	0
12 Months or Longer, Fair Value	0	0
Total	235	0
Gross unrealized loss position [Abstract]
Less than 12 Months	6	0
12 Months or Longer, Accumulated Loss	0	0
Total	6	0
International
Fair value [Abstract]
Less than 12 months	13,330	3,856
12 Months or Longer	132	179
Total	13,462	4,035
Gross unrealized losses [Abstract]
Less than 12 months	1,079	10
12 Months or Longer	38	2
Total	1,117	12
Fair Value [Abstract]
Less than 12 Months	0	0
12 Months or Longer, Fair Value	0	0
Total	0	0
Gross unrealized loss position [Abstract]
Less than 12 Months	0	0
12 Months or Longer, Accumulated Loss	0	0
Total	0	0
Debt Securities
Fair value [Abstract]
Less than 12 months	137,275	76,371
12 Months or Longer	400	10,091
Total	137,675	86,462
Gross unrealized losses [Abstract]
Less than 12 months	6,871	535
12 Months or Longer	238	57
Total	$ 7,109	$ 592