STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Balance beginning of period (in shares)	633,593
Vested (in shares)	(91,200)
Forfeited (in shares)	0
Expired (in shares)	(10,451)
Balance end of period (in shares)	531,942	633,593
Options Exercisable (in shares)	531,942
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 11.26
Vested (in usd per share)	9.30
Forfeited (in usd per share)	0
Expired (in shares)	13.98
Balance end of period (in usd per share)	11.54	$ 11.26
Options Exercisable (in usd per share)	$ 11.59
Weighted Average Remaining Contractual Life
Options Outstanding	3 years 1 month 6 days	3 years 9 months 18 days
Options Exercisable at End of Period	3 years 2 months 12 days
Aggregate Intrinsic Value ($ in millions)
Options outstanding	$ 1.7	$ 1.3
Exercised	0.5	$ 1.5	$ 4.4
Options Exercisable	$ 1.6