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STOCK-BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 17.8 | $ 16.8 | $ 13.1 |
Total income tax benefit from stock-based compensation | $ 3.1 | $ 3.2 | $ 3.7 |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Restricted Stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 5 years |  |  |
2010 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  |  |  | 6,000,000

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