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Shareholders' Equity (Schedule of Stock by Class) (Details) - $ / shares
Feb. 16, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]        
Shares, Issued 1,006,061      
Treasury Stock (shares)   2,700,000 2,300,000  
Common Class A        
Class of Stock [Line Items]        
Common stock, par value (in dollars per share)   $ 0.025 $ 0.025 $ 0.025
Authorized Shares   80,000,000 80,000,000 80,000,000
Common Stock Outstanding (shares)   38,100,000 38,200,000 37,200,000
Treasury Stock (shares)   2,200,000 1,800,000 2,800,000
Total Issued Shares   40,300,000 40,000,000 40,000,000
Common Class B        
Class of Stock [Line Items]        
Common stock, par value (in dollars per share)   $ 0.025 $ 0.025 $ 0.025
Authorized Shares   80,000,000 80,000,000 80,000,000
Common Stock Outstanding (shares)   13,500,000 13,800,000 14,200,000
Treasury Stock (shares)   0 0 800,000
Total Issued Shares   13,500,000 13,800,000 15,000,000
Common Class C        
Class of Stock [Line Items]        
Common stock, par value (in dollars per share)   $ 0.025 $ 0.025 $ 0.025
Authorized Shares   20,000,000 20,000,000 20,000,000
Common Stock Outstanding (shares)   0 0 0
Treasury Stock (shares)   500,000 500,000 500,000
Total Issued Shares   500,000 500,000 500,000