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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2011
Fair Value Measurements  
Schedule Of Company's Financial Assets And (Liabilities) At Fair Value On A Recurring Basis
     Basis of Fair Value Measurements  
     Balance at
June 30,  2011		     Level 1      Level 2     Level 3  
     (In thousands)  

Money market investment

    $ 8,000      $ 8,000       $ —        $ —     

Available for sale securities

      2,353        2,353         —          —     

Contingent consideration

      (2,707 )      —           —          (2,707 ) 

Interest rate agreements

      (1,161 )      —           (1,161 )      —     
     Basis of Fair Value Measurements  
     Balance at
December 31, 2010		     Level 1      Level 2     Level 3  
     (In thousands)  

Money market investment

    $ 96,730      $ 96,730       $ —        $ —     

Interest rate agreements

      (2,328 )      —           (2,328 )      —     

Foreign currency contracts

      176        —           176        —