STOCK REPURCHASE PROGRAM (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Oct. 20, 2016
STOCK REPURCHASE PROGRAM
Share repurchases authorized amount				$ 350,000
Aggregate amount of share repurchases (in dollars)	$ 45,542	$ 3,905	$ 72,270
Common stock repurchased (retired and held in treasury) (in shares)	546	668	1,400
Common stock repurchased (retired and held in treasury)	$ 45,500	$ 61,700	$ 113,300
Common stock repurchased and retired (in shares)		623	512
Common stock repurchased and retired		$ 57,787	$ 40,994
Remaining authorized repurchase amount		$ 80,200