Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Assumptions) (Details)

v3.10.0.1
Stock-Based Compensation (Assumptions) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of weighted average assumptions used to value options granted        
Grant date fair value of options (in dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 14.51
Volatility (as a percent) 0.00% 0.00% 0.00% 43.80%
Risk-free interest rate (as a percent) 0.00% 0.00% 0.00% 2.10%
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected term (in years)       6 years 3 months 18 days