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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

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