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Employee Equity-Based Compensation - Restricted Stock Activity (Details) - RSUs and RSAs
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Number of Shares  
Beginning balance (shares) | shares 76,000
Granted (shares) | shares 11,000
Forfeited (shares) | shares (50,000)
Vested/Released (shares) | shares (7,000)
Ending balance (shares) | shares 30,000
Weighted Average Grant Date Fair Value per Share  
Beginning balance (dollars per share) | $ / shares $ 18.70
Granted (dollars per share) | $ / shares 20.32
Forfeited (dollars per share) | $ / shares 20.80
Vested/Released (dollars per share) | $ / shares 19.47
Ending balance (dollars per share) | $ / shares $ 15.62