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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]  
Income Tax Effect on Comprehensive Income
                                 
    Three Months     Six Months  
    Ended June 30,     Ended June 30,  
    2011     2010     2011     2010  
Amortization of actuarial gain on defined benefit plan
  $ (11 )   $ —     $ (27 )   $ —  
Unrealized change in market value of available-for-sale investment
    61       —       61       —  
Unrealized hedging gain
    (12 )     —       (96 )     —  
Realization of hedging gains upon settlement
    126       —       198       —  
 
                       
 
  $ 164     $ —     $ 136     $ —