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Shareholders' Equity (Schedule of Stock by Class) (Details)
Jun. 30, 2016
vote
stock_class
$ / shares
shares
Dec. 31, 2015
vote
$ / shares
shares
Class of Stock [Line Items]    
Number of classes of common stock | stock_class 3  
Preferred stock, authorized shares 500,000.0 500,000.0
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Preferred stock, issued shares 0 0
Class A stock [Member]    
Class of Stock [Line Items]    
Authorized Shares 80,000,000 80,000,000
Common stock, shares outstanding 35,800,000 35,400,000
Treasury stock, shares 4,200,000 4,600,000
Total Issued Shares 40,000,000 40,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Number of votes | vote 1 1
Class B stock [Member]    
Class of Stock [Line Items]    
Authorized Shares 80,000,000 80,000,000
Common stock, shares outstanding 14,200,000 14,200,000
Treasury stock, shares 800,000 800,000
Total Issued Shares 15,000,000 15,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Number of votes | vote 10 10
Class C stock [Member]    
Class of Stock [Line Items]    
Authorized Shares 20,000,000 20,000,000
Common stock, shares outstanding 0 0
Treasury stock, shares 500,000 500,000
Total Issued Shares 500,000 500,000
Common stock, par value (in dollars per share) | $ / shares $ 0.025 $ 0.025
Number of votes | vote 10 10