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STOCK-BASED COMPENSATION - Other Information (Details) - Restricted Stock - USD ($) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Stock-based compensation |  |
Fair value, shares vested | $ 2,467,000 | $ 6,970,000
Tax (expense) benefits for compensation tax deductions in excess of compensation expense | (1,655,000) | $ (510,000)
Unrecognized compensation cost related to non-vested restricted shares | $ 45,512,000 |
Unrecognized compensation cost related to non-vested restricted shares recognized period | 4 years 2 months 12 days |

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