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Capital Stock (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
May 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 385,969   $ 385,969  
Share-based Compensation Arrangement by Share-based Payment Award, Aggregate Value of Shares Issued 522      
Payments for Repurchase of Common Stock $ 891 $ 26,042    
Class A Common Stock        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 33,260,710     21,613,885
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 11,252,750      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 14,926      
Stock Repurchased and Retired During Period, Shares   975,877    
Payments for Repurchase of Common Stock   $ 25,525    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 24,123      
Class B Common Stock        
Class of Stock [Line Items]        
Common Stock, Shares, Outstanding 23,184,557     23,312,291