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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock options exercised $ 1,628 $ 885 $ (191)
Common Stock Shares Outstanding Class A
      
Stock options exercised 1,628 885 (191)
Common Stock Shares Outstanding Class B
      
Stock options exercised 1,628 885 (191)
$0.01 Par Value
      
Stock options exercised 1,628 885  
Additional Paid-In Capital
      
Stock options exercised $ 1,628 $ 885 $ (191)