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Impairment, Severance And Other Costs (Tables)
 12 Months Ended
Dec. 31, 2011
Impairment, Severance And Other Costs [Abstract]  
Schedule Of Net Executive Severance Charges
     Year ended December 31,  
             2011                     2010                     2009          

Accrued severance charges, beginning of period

    $ 5,441      $ 7,671      $ 9,405   

Payments for period

      (2,238 )      (2,671 )      (2,292 ) 

Interest accretion

      315        441        558   
  

 

 

    

 

 

    

 

 

  

Accrued severance charges, end of period

    $     3,518      $     5,441      $     7,671