Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Class of Stock [Line Items]      
Shares issued upon stock option exercises (320)    
Common Stock - Class A [Member]
      
Class of Stock [Line Items]      
Balance, Beginning 39,296 44,213 51,899
Class B shares converted to Class A 2 7 8
Shares issued upon stock option exercises 320 163 116
Share awards issued 731 460 336
Shares retired (1,469) (5,244) (8,012)
Shares acquired to settle minimum statutory tax withholding requirements (337) (287) (2)
Other shares (9) (16) (132)
Balance, Ending 38,534 39,296 44,213
Common Stock - Class B [Member]
      
Class of Stock [Line Items]      
Balance, Beginning 3,171 3,178 3,186
Class B shares converted to Class A (2) (7) (8)
Shares issued upon stock option exercises 0 0 0
Share awards issued 0 0 0
Shares retired 0 0 0
Shares acquired to settle minimum statutory tax withholding requirements 0 0 0
Other shares 0 0 0
Balance, Ending 3,169 3,171 3,178