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Equity Incentive Plans - Restricted Stock and Performance Stock Units (Details) - 2015 Omnibus Incentive Plan
6 Months Ended
Jun. 30, 2020
$ / shares
shares
RSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 947,243
Granted (in shares) 518,831
Vested (in shares) (94,029)
Forfeited (in shares) (39,979)
Outstanding at end of the period (in shares) 1,332,066
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 23.49
Granted (in dollars per share) | $ / shares 25.91
Vested (in dollars per share) | $ / shares 25.19
Forfeited (in dollars per share) | $ / shares 24.09
Outstanding at end of the period (in dollars per share) | $ / shares $ 24.29
Undelivered (in shares) 74,442
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) 0
Outstanding at end of the period (in shares) 458,319
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 0
Outstanding at end of the period (in dollars per share) | $ / shares $ 24.55
Undelivered (in shares) 0