EQUITY AWARDS - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding at beginning of year (in shares)	508,000	537,872	537,872
Granted (in shares)	23,000	19,000
Exercised (in shares)	(3,000)	(19,172)
Forfeited (in shares)	(24,400)	(16,400)
Balance (in shares)	503,600	521,300	508,000	537,872
Exercisable
Outstanding (in shares)	260,880	194,140
Weighted-average exercise price (in USD per share)	$ 25.26	$ 24.52
Weighted-average remaining contractual life in years	5 years 3 days	5 years 4 months 28 days
Aggregate intrinsic value	$ 7	$ 938
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 26.68	$ 26.49	$ 26.49
Granted (in USD per share)	29.00	29.80
Exercised (in USD per share)	24.00	25.08
Forfeited (in USD per share)	31.72	28.90
Balance (in USD per share)	$ 26.55	$ 26.59	$ 26.68	$ 26.49
Weighted-Average Remaining Contractual Life in Years
Outstanding	6 years 25 days	6 years 9 months 14 days	6 years 2 months 26 days	6 years 11 months 15 days
Granted	9 years 10 months 2 days	9 years 10 months 24 days
Exercised	2 years 6 months 14 days	6 years 1 month 20 days
Forfeited	8 years 5 months 15 days	8 years 5 months 26 days
Aggregate Intrinsic Value
Outstanding	$ 3,159	$ 2,088	$ 2,088
Granted	11	0
Exercised	0	79
Forfeited	0	27
Outstanding	$ 21	$ 1,745	$ 3,159	$ 2,088