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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise of stock options $ 76 $ 81
Total compensation cost 1,400 1,200
Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise of stock options $ 76 $ 81
Non-Vested Stock Awards Outstanding    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock awards vested (in shares) 87 101