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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 |  |  |  |

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