STOCKHOLDERS' EQUITY Common Stock Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock Shares Outstanding [Abstract]
Beginning balance	59,752	58,660	58,862	57,778
Common stock issued under employee stock plans	103	178	1,057	1,302
Repurchased	0	0	(64)	(242)
Ending balance	59,855	58,838	59,855	58,838