STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended		55 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Oct. 31, 2017	Oct. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 4,100,000	$ 4,000,000	$ 10,700,000	$ 9,200,000
Income tax benefit	$ 800,000	$ 1,200,000	$ 2,000,000	$ 2,700,000
Shares authorized for repurchase						$ 600,000,000	$ 300,000,000
Repurchases of common stock (in shares)	0.1	0.2	0.6	0.5	5.4
Repurchases of common stock	$ 7,100,000	$ 12,200,000	$ 33,581,000	$ 24,500,000	$ 282,400,000
Stock repurchase program, remaining authorized repurchase amount	317,600,000		317,600,000		317,600,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	28,500,000		$ 28,500,000		28,500,000
Period for recognition (in years)			2 years 7 months 1 day
Fair value restricted stock	1,100,000	$ 500,000	$ 9,400,000	6,200,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2,100,000		2,100,000		$ 2,100,000
Fair value restricted stock			$ 500,000	$ 1,400,000
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