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Stock Based Compensation Table of Stock Options Valuation Assumptions (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Common Stock - Class A                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividends declared per share $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.075 $ 0.075
Employee Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period             3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Term Requirement Where Weighted Average Stock Price Must Exceed Book Value             20 days  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Historical Volatility based on Historical Daily Returns, Look-back Period             2 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                
Historical Volatility             50.19%  
Historical Volatility             50.46%  
Risk-free Rate             1.93%  
Risk-free Rate             2.28%  
Expected term (years)             6 years 6 months  
Employee Stock Option | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate             1.76%  
Employee Stock Option | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate             1.70%  
Employee Stock Option | Common Stock - Class A                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividends declared per share $ 0.025