STOCK REPURCHASE PROGRAM (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 20, 2016
STOCK REPURCHASE PROGRAM
Share repurchases authorized amount				$ 350,000
Aggregate amount of share repurchases (in dollars)	$ 3,905	$ 120,540
Common stock repurchased (retired and held in treasury) (in shares)	668	1,900
Common stock repurchased (retired and held in treasury)	$ 61,700	$ 161,500
Common stock repurchased and retired (in shares)	623	512
Common stock repurchased and retired	$ 57,786	$ 40,994	$ 131,371
Remaining authorized repurchase amount	$ 80,200