Annual report pursuant to Section 13 and 15(d)

Treasury and Preferred Stock (Details)

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Treasury and Preferred Stock (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Treasury stock activity [Roll Forward]      
Balance, End of period (in shares) 13,434,000 13,877,000  
Preferred shares outstanding (in shares) 0 0 0
Preferred shares authorized (in shares) 12,500,000 12,500,000 12,500,000
Preferred shares par value (in dollars per share) 0.75 0.75 0.75
Common Class A [Member]
      
Treasury stock activity [Roll Forward]      
Balance, Beginning of period (in shares) 13,877,000 14,220,000 14,793,000
Compensation plans and other (in shares) (443,000) (343,000) (573,000)
Balance, End of period (in shares) 13,434,000 13,877,000 14,220,000