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Stock-Based Compensation (Details)
shares in Millions
12 Months Ended
Dec. 31, 2016
shares
Share-based compensation  
Percentage of stock awards vesting per year 20.00%
Class A common stock  
Share-based compensation  
Shares of common stock available for future grant under stock incentive plans 67.6
Stock options  
Share-based compensation  
Maximum Expiration term 10 years