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Stock-Based Compensation - Non-Vested Common Stock Grants (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
Jun. 30, 2019
shares
$ / shares
Jun. 30, 2018
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Contingent Restricted Shares     45,000    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award          
Less: Vested shares     121,628    
Less: Vested (fair value) | $ / shares     $ 19.12    
Granted shares 110,526 76,250 132,578 86,210  
Granted (fair value) | $ / shares $ (16.23) $ (19.72) $ (16.28) $ (19.70)  
Outstanding shares 223,127   223,127   217,936
Outstanding (fair value) | $ / shares $ 17.65   $ 17.65   $ 18.96
Less: Forfeited shares     5,759    
Less: Forfeited (fair value) | $ / shares     $ 20.34