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Stock-Based Compensation (Stock Plans) (Details) - USD ($)
Oct. 26, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Price $ 30.99  
Stock options | EIP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 43,086  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.96  
share-based compensation arrangement by share-based payment award, options, grants in period, grant date fair value $ 300,000.0  
Stock options outstanding   4,041,616
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number   1,003,871
Common stock, Class A | Restricted stock units (RSUs) | EIP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 34,196  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,100,000