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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Long Term Incentive Compensation (Details) - USD ($) shares in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 10, 2019 | Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Performance Shares |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Award vesting period (years) |  |  |  | 3 years |
RSU |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Award vesting period (years) |  |  |  | 3 years |
Restricted stock shares, restricted stock units, and stock options |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Compensation expense |  | $ 3.3 | $ 4.2 | $ 6.8 | $ 8.1
Related tax benefit |  | $ 0.8 | $ 1.1 | $ 1.7 | $ 2.1
Director | RSU |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Granted (in shares) | 23 |  |  |  |

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