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Equity-Based Compensation Equity-Based Compensation - Performance and Market Based RSUs (Details) - Performance and Market-based Restricted Stock Units
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Units  
Outstanding at beginning of year - shares | shares 271,305
Granted - shares | shares 72,043
Attained by performance - shares | shares 18,600
Vested and released - shares | shares (72,456)
Forfeited - shares | shares (21,700)
Outstanding at end of year - shares | shares 267,792
Maximum potential units outstanding at June 30, 2016 - shares | shares 0
Weighted Average Grant Date Fair Value  
Beginning of year - weighted average fair value | $ / shares $ 18.77
Granted - weighted average fair value | $ / shares 28.75
Attained by performance - weighted average fair value | $ / shares 17.66
Vested and released - weighted average fair value | $ / shares 18.66
Forfeited - weighted average fair value | $ / shares 17.66
End of year - weighted average fair value | $ / shares 21.44
Maximum potential units outstanding at June 30, 2016 - weighted average fair value | $ / shares $ 0.00