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Common Stock and Share-Based Compensation - Options Outstanding and Exercisable (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
8.96 to 10.44  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (shares) | shares 88,451
Weighted-Average Exercise Price (USD per share) $ 9.77
Weighted- Average Remaining Contractual Life (in years) 2 years 8 months 9 days
Exercise price range, lower limit (USD per share) $ 8.96
Exercise price range, upper limit (USD per share) $ 10.44
12.60  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (shares) | shares 67,287
Weighted-Average Exercise Price (USD per share) $ 12.60
Weighted- Average Remaining Contractual Life (in years) 1 year 1 month 13 days
Exercise price range, lower limit (USD per share) $ 12.60
13.30 to 15.70  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (shares) | shares 31,987
Weighted-Average Exercise Price (USD per share) $ 14.46
Weighted- Average Remaining Contractual Life (in years) 2 years
Exercise price range, lower limit (USD per share) $ 13.30
Exercise price range, upper limit (USD per share) $ 15.70
17.36  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (shares) | shares 194,233
Weighted-Average Exercise Price (USD per share) $ 17.36
Weighted- Average Remaining Contractual Life (in years) 1 month 13 days
Exercise price range, lower limit (USD per share) $ 17.36
17.48  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (shares) | shares 3,580
Weighted-Average Exercise Price (USD per share) $ 17.48
Weighted- Average Remaining Contractual Life (in years) 2 months 1 day
Exercise price range, lower limit (USD per share) $ 17.48