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Stock-based Compensation - Restricted Stock Units (Details) - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Restricted Stock Units (RSUs) [Member]    
Non-vested RSU's, beginning balance (in shares) 310,430  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share) $ 21.49  
Granted RSU's (in shares) 212,811 238,985
Granted RSU's, weighted-average grant-date fair value (in dollars per share) $ 24.83  
Vested RSU's (in shares) (204,837)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share) $ 23.73  
Forfeited RSU's (in shares) (1,070)  
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share) $ 24.22  
Non-vested RSU's, ending balance (in shares) 317,334  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 22.27  
Vested RSU's but unissued (in shares) 218,025  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 22.41  
Performance-based Restricted Stock Units [Member]    
Non-vested RSU's, beginning balance (in shares) 102,920  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share) $ 20.02  
Granted RSU's (in shares) 63,250 62,790
Granted RSU's, weighted-average grant-date fair value (in dollars per share) $ 25.11  
Vested RSU's (in shares) (64,950)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share) $ 23.75  
Non-vested RSU's, ending balance (in shares) 101,220  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 20.81  
Vested RSU's but unissued (in shares) 111,805  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 20.76