SHARE-BASED COMPENSATION - Other Options Disclosures (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Upon vesting, period to exercise in years	4 years
Fair value per share upon grant (in dollars per share)	$ 0	$ 0	$ 4
Number of options granted (in shares)	0	0	686
Intrinsic value per share upon exercise (in dollars per share)	$ 7.06	$ 7.33	$ 7.24
Intrinsic value of options exercised	$ 1,272	$ 829	$ 60
Tax benefit from options exercised	73	220	21
Cash received from exercise price of options exercised	$ 244	$ 153	$ 42
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range of options issued (in dollars per share)	$ 1.34	$ 1.34	$ 1.34
Upon vesting, period to exercise in years	1 year	1 year	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range of options issued (in dollars per share)	$ 1.34	$ 2.02	$ 11.31
Upon vesting, period to exercise in years	10 years	10 years	10 years