STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		37 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Oct. 31, 2017	Oct. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 3,100	$ 2,300
Income tax benefit	900	$ 800
Shares authorized for repurchase				$ 600,000	$ 300,000
Stock repurchase program, remaining authorized repurchase amount	$ 336,900		$ 336,900
Repurchases of common stock (in shares)	0.3	0.1	5.1
Repurchases of common stock	$ 14,264	$ 6,800	$ 263,100
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 28,500		28,500
Period for recognition (in years)	2 years 8 months
Fair value restricted stock	$ 1,300	1,500
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	2,000		$ 2,000
Fair value restricted stock	$ 500	$ 1,400
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years