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Share-based Compensation and Equity - Equity Award Modifications (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 19, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise prices (in dollars per share)     $ 19.30 $ 18.18 $ 18.79 $ 19.30 $ 21.81
Number of stock options outstanding (in shares)     9,903 5,388 9,020 9,903 10,928
Stock compensation expense       $ 12,994 $ 10,791 $ 64,788  
Stock compensation expense not yet recognized, options       $ 2,891      
Stock options, net of estimated forfeitures              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense     $ 15,000        
Class A Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Average stock closing price period 20 days            
Exercise prices (in dollars per share) $ 17.44            
Class A Common Stock | Weighted Average              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share price (in dollars per share) $ 17.44            
Class B Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of stock options outstanding (in shares) 5,300            
Class B Common Stock | Stock options, net of estimated forfeitures              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense   $ 5,100          
Stock compensation expense not yet recognized, options $ 2,500