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
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Class of Stock [Line Items]    
Shares issued upon stock option exercises (188)  
Common Stock - Class A [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 39,296 44,213
Class B shares converted to Class A 0 2
Shares issued upon stock option exercises 188 37
Share awards issued 520 416
Shares retired (869) (1,881)
Shares acquired to settle minimum statutory tax withholding requirements (291) 0
Other shares (1) (25)
Balance, Ending 38,843 42,762
Common Stock - Class B [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 3,171 3,178
Class B shares converted to Class A 0 (2)
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 3,171 3,176