Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Changes in issued Common Stock) (Details)

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Business and Summary of Significant Accounting Principles (Changes in issued Common Stock) (Details) (USD $)
Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Common Stock [Roll Forward]        
Shares issued upon stock option exercises     40  
Stock Repurchased and Retired During Period, Value     $ 1,972,000 $ 15,388,000
Common Stock - Class A [Member]
        
Common Stock [Roll Forward]        
Balance, Beginning     37,299 38,534
Class B shares converted to Class A     3 3
Shares issued upon stock option exercises     40 54
Share awards issued     1,186 664
Shares retired     (148) (1,795)
Stock Repurchased and Retired During Period, Value     1,972,000 15,518,000
Shares acquired to settle minimum statutory tax withholding requirements     (37) (17)
Balance, Ending 38,343 37,443 38,343 37,443
Common Stock - Class B [Member]
        
Common Stock [Roll Forward]        
Balance, Beginning     3,165 3,169
Class B shares converted to Class A     (3) (3)
Shares issued upon stock option exercises     0 0
Share awards issued     0 0
Shares retired     0 0
Shares acquired to settle minimum statutory tax withholding requirements     0 0
Balance, Ending 3,162 3,166 3,162 3,166
Stock Buyback Program [Member]
        
Common Stock [Roll Forward]        
Stock Repurchase Program, Remaining Authorized Repurchase Amount 120,000,000   120,000,000  
Stock Buyback Program [Member] | Common Stock - Class A [Member]
        
Common Stock [Roll Forward]        
Shares retired (100) (200) (100) (1,700)
Stock Repurchased and Retired During Period, Value $ 1,300,000 $ 2,200,000 $ 1,300,000 $ 15,100,000