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Stock-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number ofStock Options    
Outstanding, beginning of period (in shares) 283,686  
Exercised (in shares) (56,352)  
Canceled/Forfeited (in shares) (3,000)  
Outstanding, end of period (in shares) 224,334 283,686
Exercisable (in shares) 213,901  
Weighted AverageExercise Price    
Outstanding, beginning of period (in USD per share) $ 20.46  
Exercised (in USD per share) 8.97  
Canceled/Forfeited (in USD per share) 27.91  
Outstanding, end of period (in USD per share) 23.25 $ 20.46
Exercisable (in USD per share) $ 23.01  
Weighted Average Remaining Contractual Life (years)    
Outstanding 3 years 11 months 1 day 3 years 6 months 29 days
Exercisable 3 years 8 months 26 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding, beginning of period $ 434  
Exercised 474  
Canceled/Forfeited 0  
Outstanding, end of period 14 $ 434
Exercisable $ 14