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Stock-based Compensation - Restricted Stock Units (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restricted Stock Units (RSUs) [Member]        
Non-vested RSU's, beginning balance (in shares)     428,295  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share)     $ 24.42  
Granted RSU's (in shares) 2,500 0 172,728 263,574
Granted RSU's, weighted-average grant-date fair value (in dollars per share)     $ 19.66  
Vested RSU's (in shares)     (236,981)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share)     $ 22.34  
Forfeited RSU's (in shares)     (2,415)  
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share)     $ 24.62  
Non-vested RSU's, ending balance (in shares) 361,627   361,627  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 23.51   $ 23.51  
Vested RSU's but unissued (in shares) 215,017   215,017  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 23.24   $ 23.24  
Performance-based Restricted Stock Units [Member]        
Non-vested RSU's, beginning balance (in shares)     34,186  
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share)     $ 22.38  
Granted RSU's (in shares) 0 0 72,143 57,870
Granted RSU's, weighted-average grant-date fair value (in dollars per share)     $ 20.38  
Vested RSU's (in shares)     (35,149)  
Vested RSU's, weighted-average grant-date fair value (in dollars per share)     $ 20.54  
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) 71,180   71,180  
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share) $ 21.26   $ 21.26  
Vested RSU's but unissued (in shares) 62,515   62,515  
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share) $ 21.35   $ 21.35