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EQUITY-BASED COMPENSATION - Stock-settled incentive awards outstanding (Details) - Stock-Settled Incentive Awards
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Value at Target  
Non-vested at beginning of period $ 3,147
Forfeited during 2019 210
Non-vested at end of period 2,937
Award Value Being Recognized  
Non-vested at beginning of period 1,202
Forfeited during 2019 (80)
Non-vested at end of period $ 1,122