FAIR VALUE - RECURRING (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Marketable Securities	$ 116,748
Recurring
Marketable Securities		$ 116,748	$ 75,897
Available-for-sale Securities
Marketable Securities	116,748	75,897
Corporate
Marketable Securities	20,064	24,891
Corporate | Recurring
Marketable Securities		20,064	24,891
Corporate | Level 2 | Recurring
Marketable Securities	19,564	24,391
Corporate | Level 3 | Recurring
Marketable Securities	500	500
US Agencies
Marketable Securities	15,970	16,846
US Agencies | Recurring
Marketable Securities		15,970	16,846
US Agencies | Level 2 | Recurring
Marketable Securities	15,970	16,846
US Agencies - MBS
Marketable Securities	32,840	12,716
US Agencies - MBS | Recurring
Marketable Securities		32,840	12,716
US Agencies - MBS | Level 2 | Recurring
Marketable Securities	32,840	12,716
Obligations of states and political subdivisions
Marketable Securities	47,874	21,444
Obligations of states and political subdivisions | Recurring
Marketable Securities		47,874	$ 21,444
Obligations of states and political subdivisions | Level 2 | Recurring
Marketable Securities	46,886	20,444
Obligations of states and political subdivisions | Level 3 | Recurring
Marketable Securities	$ 988	$ 1,000