Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Modified Stock Options (Details)

v3.10.0.1
Stock-Based Compensation - Schedule of Modified Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Shares (in thousands)    
Number of Shares, Outstanding, Beginning of Period (in shares) 533,600  
Number of Shares, Exercised (in shares) (66,100)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (14,000)  
Number of Shares, Outstanding, Ending of Period (in shares) 453,500 533,600
Number of Shares, Exercisable (in shares) 453,500  
Weighted Average Exercise Price (per share)    
Outstanding, beginning of period (in dollars per share) $ 12.77  
Exercised (in dollars per share) 11.65  
Canceled (in dollars per share) (14.15)  
Outstanding, end of period (in dollars per share) 12.89 $ 12.77
Exercisable (in dollars per share) $ 12.89  
Additional Stock Option Activity Disclosures    
Weighted Average Remaining Contractual Term (years), Outstanding 3 years 7 months 1 day 4 years 8 months 10 days
Weighted Average Remaining Contractual Term (years), Exercisable 3 years 7 months 1 day  
Aggregate Intrinsic Value, Outstanding $ 0.2 $ 2.2
Aggregate Intrinsic Value, Exercisable $ 0.2