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SHARE BASED COMPENSATION - Service Based Restricted Stock Activity (Details) - Restricted stock units
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 763,728
Granted (in shares) | shares 585,188
Vested (in shares) | shares (26,044)
Forfeited/canceled (in shares) | shares (42,089)
Ending balance (in share) | shares 1,280,783
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 19.64
Granted (in dollars per share) | $ / shares 15.51
Vested (in dollars per share) | $ / shares 21.95
Forfeited/canceled (in dollars per share) | $ / shares 18.67
Ending balance (in dollars per share) | $ / shares $ 17.74
Unamortized stock compensation expense | $ $ 18.6
Weighted-average recognition period (in years) 2 years 10 months 24 days