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
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Common Stock - Class A [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 38,534 39,296
Class B shares converted to Class A 2 0
Shares issued upon stock option exercises 50 187
Share awards issued 621 316
Shares retired (795) (862)
Shares acquired to settle minimum statutory tax withholding requirements (14) (289)
Other shares (2) 0
Balance, Ending 38,396 38,648
Common Stock - Class B [Member]
    
Class of Stock [Line Items]    
Balance, Beginning 3,169 3,171
Class B shares converted to Class A (2) 0
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 3,167 3,171