Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Incentive Plans and Grants of Stock Awards (Details)

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Stock-Based Compensation - Incentive Plans and Grants of Stock Awards (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value assumptions      
Dividend rate 0.00% 0.00% 0.00%
Options | Minimum      
Fair value assumptions      
Expected term 5 years 3 months 18 days 5 years 3 months 18 days 5 years 3 months 18 days
Volatility rate 24.40% 24.40% 24.40%
Options | Maximum      
Fair value assumptions      
Expected term 6 years 3 months 18 days 6 years 3 months 18 days 6 years 3 months 18 days
Volatility rate 25.70% 25.70% 25.70%
Options | Series A common stock      
Stock Based Compensation      
Options granted (in shares) 0    
Options | CEO | Series C common stock      
Stock Based Compensation      
Options granted (in shares) 302    
Grant date fair value $ 31.12    
Options | Employee | Series C common stock      
Stock Based Compensation      
Options granted (in shares) 41    
Grant date fair value $ 32.21    
Options | Employee | Series C common stock | Minimum      
Stock Based Compensation      
Vesting period 3 years    
Options | Employee | Series C common stock | Maximum      
Stock Based Compensation      
Vesting period 5 years    
Options | Non-employee | Director | Series C common stock      
Stock Based Compensation      
Vesting period 1 year    
Options granted (in shares) 8 10 16
Grant date fair value $ 31.18 $ 24.04 $ 22.68
RSUs | CEO | Series C common stock      
Stock Based Compensation      
Vesting period 1 year    
Granted (in shares) 25    
Grant date fair value $ 88.99    
2019 Plan      
Stock Based Compensation      
Number of authorized shares 6,000    
2019 Plan | Minimum      
Stock Based Compensation      
Vesting period 1 year    
Term of awards 7 years    
2019 Plan | Maximum      
Stock Based Compensation      
Vesting period 5 years    
Term of awards 10 years