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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2011
Financial Instruments [Abstract]  
Carrying And Estimated Fair Values Of Financial Instruments
     2011     2010  
     Carrying
Amount		     Fair Value     Carrying
Amount		     Fair Value  
     (In thousands)  

Cash and cash equivalents

    $ 156,313      $ 156,313      $ 196,556      $ 196,556   

Long-term debt —

         

5.75% senior notes

      (399,486 )      (423,324 )      (399,143 )      (430,464 ) 

6.50% senior notes

      (149,962 )      (174,576 )      (149,956 )      (158,800 ) 

Term loan

      (150,000 )      (150,000 )      —        —   

Receivables credit facility

      (109,000 )      (109,000 )      (109,000 )      (109,000 ) 

Capital lease obligation

      (21,832 )      (21,832 )      (22,502 )      (22,502 )