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STOCK-BASED COMPENSATION - Narrative (Details) - Restricted Stock - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentages of vesting for one year	100.00%
Percentages of vesting for three years	50.00%
Percentages of vesting for five years	33.30%
Percentages of vesting for ten years	20.00%
Percentages of vesting in period five	10.00%
Number of shares available for future grant (in shares)	272,510
Stock compensation expense	$ 1.5	$ 1.4
Related income tax benefits recognized in earnings	0.4	$ 0.6
Unrecognized compensation expense	$ 4.1		$ 1.6
Compensation cost not yet recognized, period for recognition	23 months 15 days
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

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