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STOCK-BASED COMPENSATION PLANS - RSA and RSU Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested $ 8,312 $ 20,515 $ 10,376
RSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested $ 9,700 $ 19,100 $ 10,100