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Stock-Based Compensation - Restricted Stock and Performance Awards (Details) - Restricted Stock Award and Performance Award - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares    
Unvested, beginning balance (shares) 452,233 519,272
Granted (shares) 270,191 180,629
Vested (shares) (201,563) (247,534)
Forfeited (shares) (3,175) (134)
Unvested, ending balance (shares) 517,686 452,233
Weighted Average Share Price    
Unvested, beginning balance (usd per share) $ 17.90 $ 14.69
Granted (usd per share) 19.11 22.22
Vested (usd per share) 17.41 14.50
Forfeited (usd per share) 20.30 15.21
Unvested, ending balance (usd per share) $ 18.71 $ 17.90