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Equity Incentive Plans - Restricted Stock and Performance Stock Units (Details) - 2015 Omnibus Incentive Plan
9 Months Ended
Sep. 30, 2020
$ / shares
shares
RSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 947,243
Granted (in shares) 519,208
Vested (in shares) (94,406)
Forfeited (in shares) (58,816)
Outstanding at end of the period (in shares) 1,313,229
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 23.49
Granted (in dollars per share) | $ / shares 25.92
Vested (in dollars per share) | $ / shares 25.22
Forfeited (in dollars per share) | $ / shares 24.06
Outstanding at end of the period (in dollars per share) | $ / shares $ 24.30
Undelivered (in shares) 64,475
PSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 207,077
Granted (in shares) 252,031
Vested (in shares) (789)
Forfeited (in shares) (743)
Outstanding at end of the period (in shares) 457,576
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 23.47
Granted (in dollars per share) | $ / shares 25.45
Vested (in dollars per share) | $ / shares 25.45
Forfeited (in dollars per share) | $ / shares 25.45
Outstanding at end of the period (in dollars per share) | $ / shares $ 24.55
Undelivered (in shares) 0