STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended		31 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 4,000,000	$ 3,000,000	$ 9,200,000	$ 7,700,000
Income tax benefit	$ 1,200,000	$ 900,000	$ 2,700,000	$ 2,300,000
Repurchases of common stock (in shares)	0.2	0.1	0.5	0.3	4.3
Repurchases of common stock	$ 12,200,000	$ 6,200,000	$ 24,465,000	$ 16,300,000	$ 224,300,000
Stock repurchase program, remaining authorized repurchase amount	75,700,000		75,700,000		75,700,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	27,800,000		$ 27,800,000		27,800,000
Period for recognition (in years)			2 years 10 months 31 days
Fair value restricted stock	500,000	1,800,000	$ 6,200,000	7,900,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	1,500,000		1,500,000		$ 1,500,000
Fair value restricted stock	$ 0	$ 0	$ 1,400,000	$ 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
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for repurchase						$ 300,000,000
Stock repurchase program, remaining authorized repurchase amount						$ 375,700,000