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STOCK-BASED COMPENSATION - Board of Directors Compensation - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Stock [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 19.4 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 10 months 2 days |  |
Director [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Restricted stock awards and units vesting terms | 1 year |  |
Fair value of shares issued | $ 4.3 | $ 1.6 | $ 1.5
Shares issued (in shares) | 25,000 | 27,500 | 30,000

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