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Stock-based Compensation - Restricted Stock Units (Details) - $ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Restricted Stock Units (RSUs) [Member]    
Non-vested RSU's, beginning balance (in shares) 336,898  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share) $ 23.48  
Granted RSU's (in shares) 238,985 172,228
Granted RSU's, weighted-average grant-date fair value (in dollars per share) $ 18.44  
Vested RSU's (in shares) (240,176)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share) $ 21.22  
Forfeited RSU's (in shares) (4,662)  
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share) $ 20.61  
Non-vested RSU's, ending balance (in shares) 331,045  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 21.51  
Vested RSU's but unissued (in shares) 214,829  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 21.03  
Performance-based Restricted Stock Units [Member]    
Non-vested RSU's, beginning balance (in shares) 66,580  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share) $ 21.26  
Granted RSU's (in shares) 62,790 72,143
Granted RSU's, weighted-average grant-date fair value (in dollars per share) $ 18.46  
Vested RSU's (in shares) (35,070)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share) $ 18.81  
Forfeited RSU's (in shares) 0  
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share) $ 0  
Non-vested RSU's, ending balance (in shares) 94,300  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 20.31  
Vested RSU's but unissued (in shares) 102,185  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 20.48