STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended		28 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,900,000	$ 2,600,000	$ 5,200,000	$ 4,700,000
Income tax benefit	$ 800,000	$ 800,000	$ 1,500,000	$ 1,400,000
Share repurchase program authorized						$ 300,000,000
Repurchases of common stock (in shares)	0.1	0.1	0.2	0.2	4.1
Repurchases of common stock	$ 5,500,000	$ 5,100,000	$ 12,257,000	$ 10,100,000	$ 212,100,000
Stock repurchase program, remaining authorized repurchase amount	87,900,000		87,900,000		87,900,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	23,800,000		$ 23,800,000		23,800,000
Period for recognition (in years)			2 years 225 days
Fair value restricted stock	4,500,000	2,300,000	$ 6,000,000	6,100,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	900,000		900,000		$ 900,000
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