STOCK-BASED INCENTIVE COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Aggregate Intrinsic Value
Weighted Average Remaining Contractual Life at December 31, 2020	2 years 1 month 6 days
Stock Option
Options
Balance at December 31, 2019 (in shares)	644,975
Granted (in shares)	204,928	0	0
Exercised (in shares)	(266,065)
Forfeited and expired (in shares)	(171,007)
Balance at December 31, 2020 (in shares)	412,831	644,975
Exercisable at December 31, 2020 (in shares)	197,735
Weighted Average Exercise Price
Balance at December 31, 2019 (in dollars per share)	$ 15.36
Granted (in dollars per share)	13.34
Exercised (in dollars per share)	7.63
Forfeited and expired (in dollars per share)	26.36
Balance at December 31, 2020 (in dollars per share)	14.77	$ 15.36
Exercisable at December 31, 2020 (in dollars per share)	$ 16.51
Aggregate Intrinsic Value
Balance at December 31, 2019	$ 2,754
Granted	471
Exercised	2,548
Forfeited and expired	88
Balance at December 31, 2020	1,320	$ 2,754
Exercisable at December 31, 2020	$ 789
Weighted Average Remaining Contractual Life at December 31, 2020	6 years 8 months 12 days
Weighted Average Remaining Contractual Life Exercisable at December 31, 2020	4 years 2 months 12 days