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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise of stock options     $ 14 $ 101
Total compensation cost $ 1,000 $ 1,400 2,000 2,800
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise of stock options $ 101 $ 15 $ 15 $ 101
Non-Vested Stock Awards Outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards vested (in shares) 62 63 127 150