SHARE-BASED COMPENSATION - RSU Plan During Current period (Details) - Restricted Stock Units (RSUs) - USD ($) shares in Thousands, $ / 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]
RSUs outstanding beginning (in shares)	3,685
RSUs issued (in shares)	1,955	1,292	3,064
RSUs released (in shares)	(1,456)	(1,496)	(474)
RSUs forfeited (in shares)	(323)	(396)	(379)
RSUs outstanding ending (in shares)	3,861	3,685
RSU weighted average purchase price (in dollars per share)	$ 0
RSU weighted average remaining contractual terms	1 year 3 months 18 days
RSU aggregate instrinsic value	$ 17,993
RSU vested Number of Restricted Stock Units (in shares)	3,861
RSU vested and expected to vest weighted average purchase price (in dollars per share)	$ 0
RSU vested and expected to vest contractual term	1 year 3 months 18 days
RSU Options Vested And Expected To Vest Aggregate Intrinsic Value	$ 17,993
RSU Options Exercisable (in shares)	41
RSU options weighted average purchase price excercisable (in dollars per share)	$ 0
RSU excercisable aggregate instrinsic value.	$ 193
Weighted average remaining recognition period in years	2 years 2 months 12 days
Unamortized compensation expense	$ 19,840