STOCK-BASED COMPENSATION - Weighted Average Grant Date Fair Value and Fair Value of PSUs Vested (Details) - Restricted Stock Units, Performance-Based - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of PSUs granted	$ 16.62	$ 15.21
Fair value of PSUs vested (in thousands)	$ 2,302	$ 3,120

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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