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)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Class of Stock [Line Items]    
Shares issued upon stock option exercises (284)  
Common Stock - Class A [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 39,296 44,213
Class B shares converted to Class A 2 6
Shares issued upon stock option exercises 284 157
Share awards issued 516 417
Shares retired (980) (3,802)
Shares acquired to settle minimum statutory tax withholding requirements (292) 0
Other shares (8) (25)
Balance, Ending 38,818 40,966
Common Stock - Class B [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 3,171 3,178
Class B shares converted to Class A (2) (6)
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
Other shares 0 0
Balance, Ending 3,169 3,172