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Equity Incentive Plans - Restricted Stock and Performance Stock Units (Details) - 2015 Omnibus Incentive Plan
9 Months Ended
Sep. 30, 2021
$ / shares
shares
RSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 1,253,173
Granted (in shares) 312,807
Vested (in shares) (380,097)
Forfeited (in shares) (61,002)
Outstanding at end of the period (in shares) 1,124,881
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 24.33
Granted (in dollars per share) | $ / shares 45.77
Vested (in dollars per share) | $ / shares 25.39
Forfeited (in dollars per share) | $ / shares 27.03
Outstanding at end of the period (in dollars per share) | $ / shares $ 29.79
Undelivered (in shares) 120,178
PSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 457,576
Granted (in shares) 145,882
Vested (in shares) 0
Forfeited (in shares) (47,210)
Outstanding at end of the period (in shares) 556,248
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 24.55
Granted (in dollars per share) | $ / shares 45.36
Vested (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 28.74
Outstanding at end of the period (in dollars per share) | $ / shares $ 29.65
Undelivered (in shares) 0