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Stock-Based Compensation - Restricted Stock and Performance Share Units (Details)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Weighted Average Grant Date Fair Value  
Outstanding, Beginning balance (usd per share) | $ / shares $ 18.05
Granted (usd per share) | $ / shares 15.92
Vested (usd per share) | $ / shares 19.08
Adjustment for incentive awards expected to vest (usd per share) | $ / shares 17.84
Weighted average grant date fair value, cancelled and forfeited (usd per share) | $ / shares 16.46
Outstanding, Ending balance (usd per share) | $ / shares $ 17.89
Restricted Stock  
Restricted Stock, Deferred Stock Units and Performance Share Units  
Outstanding, Beginning balance (in shares) 171,934
Granted (in shares) 111,337
Vested (in shares) (106,347)
Adjustment for incentive awards expected to vest (in shares) 0
Cancelled and forfeited (in shares) (3,167)
Outstanding, Ending balance (in shares) 173,757
Deferred Stock Units  
Restricted Stock, Deferred Stock Units and Performance Share Units  
Outstanding, Beginning balance (in shares) 66,136
Granted (in shares) 8,814
Vested (in shares) 0
Adjustment for incentive awards expected to vest (in shares) 0
Cancelled and forfeited (in shares) 0
Outstanding, Ending balance (in shares) 74,950
Performance Share Units  
Restricted Stock, Deferred Stock Units and Performance Share Units  
Outstanding, Beginning balance (in shares) 150,022
Granted (in shares) 147,367
Vested (in shares) (7,940)
Adjustment for incentive awards expected to vest (in shares) (66,323)
Cancelled and forfeited (in shares) (47,111)
Outstanding, Ending balance (in shares) 176,015