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Shareholders' Equity (Schedule of Stock by Class) (Details)
Mar. 31, 2017
stock_class
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Class of Stock [Line Items]    
Number of classes of common stock | stock_class 3  
Class A stock [Member]    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Authorized Shares 80,000,000 80,000,000
Outstanding 37,800,000 37,200,000
Treasury 2,200,000 2,800,000
Total Issued Shares 40,000,000 40,000,000
Class B stock [Member]    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Authorized Shares 80,000,000 80,000,000
Outstanding 14,200,000 14,200,000
Treasury 800,000 800,000
Total Issued Shares 15,000,000 15,000,000
Class C stock [Member]    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Authorized Shares 20,000,000 20,000,000
Outstanding 0 0
Treasury 500,000 500,000
Total Issued Shares 500,000 500,000