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Equity Incentive Plans - Restricted Stock and Performance Stock Units (Details) - 2015 Omnibus Incentive Plan
3 Months Ended
Mar. 31, 2022
$ / shares
shares
RSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 691,373
Granted (in shares) 345,230
Vested (in shares) (68,189)
Forfeited (in shares) (5,617)
Outstanding at end of the period (in shares) 962,797
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 33.66
Granted (in dollars per share) | $ / shares 43.96
Vested (in dollars per share) | $ / shares 32.72
Forfeited (in dollars per share) | $ / shares 31.26
Outstanding at end of the period (in dollars per share) | $ / shares $ 37.43
Undelivered (in shares) 41,173
PSUs  
Number of Units  
Outstanding at beginning of the period (in shares) 367,067
Granted (in shares) 167,587
Vested (in shares) 0
Forfeited (in shares) 0
Outstanding at end of the period (in shares) 534,654
Weighted - Average Fair Value  
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 32.84
Granted (in dollars per share) | $ / shares 43.96
Vested (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 0
Outstanding at end of the period (in dollars per share) | $ / shares $ 36.32