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Share-based Compensation and Equity - Equity Award Modifications (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 19, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock compensation expense not yet recognized, options           $ 5,443    
Exercise prices (in dollars per share)         $ 19.30 $ 18.79 $ 21.81 $ 26.12
Number of stock options outstanding (in shares)         9,903 9,020 10,928 11,427
Employee Time Options                
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 | Employee Time Options                
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      
2013 Long-Term Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise prices (in dollars per share)   $ 23.20   $ 23.20        
2013 Long-Term Incentive Plan | Employee Time Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares affected in modification of stock options (in shares)   5,338            
Stock compensation expense       $ 6,000        
Stock compensation expense not yet recognized, options   $ 5,000   $ 5,000