Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Fair Value Inputs) (Details)

v3.19.3.a.u2
Share-Based Compensation (Fair Value Inputs) (Details)
12 Months Ended
Dec. 31, 2019
Simulations
$ / shares
Dec. 31, 2018
Simulations
$ / shares
Dec. 31, 2017
Simulations
$ / shares
Dec. 31, 2016
$ / shares
RSU equity awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of simulations | Simulations 100,000 100,000 100,000  
Expected term (in years) 2 years 10 months 24 days 2 years 7 months 6 days 2 years 7 months 6 days  
Expected volatility 47.90% 51.60% 65.30%  
Risk-free interest rate 2.40% 2.60% 1.50%  
Dividend yield 0.00% 0.00% 0.00%  
Grant date fair value per performance-based RSU Equity Award (in dollars per share) $ 10.78 $ 16.66 $ 16.06  
Cash-settled SARs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term (in years) 5 years 4 months 24 days 4 years 6 months 1 year 10 months 24 days 1 year 1 month 6 days
Expected volatility 60.70% 56.90% 58.60% 68.10%
Risk-free interest rate 1.70% 1.70% 1.60% 1.50%
Dividend yield 0.00% 0.00% 0.00% 0.00%
Acquisition date fair value per Cash SAR (in dollars per share) $ 2.11 $ 1.42 $ 0.21 $ 0.10