STOCKHOLDERS' EQUITY Common Stock Shares Outstanding (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Common Stock Shares Outstanding [Abstract]
Beginning balance	29,330,000	29,421,000	28,889,000	29,782,000
Common stock issued under employee stock plans	89,000	59,000	651,000	630,000
Repurchased	0	(152,000)	(121,000)	(1,084,000)
Ending balance	29,419,000	29,328,000	29,419,000	29,328,000