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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Financial Instruments [Abstract]  
Schedule To Carrying Value And Estimated Fair Value Of Financial Instruments
                                 
    December 31,
2011
    June 30,
2012
 
    Carrying
amount
    Fair
value
    Carrying
amount
    Fair
value
 
    (In thousands)  

Accounts receivable, net

  $ 58,976     $ 58,976     $ 66,438     $ 66,438  

Accounts payable

    14,334       14,334       15,697       15,697  
         

Debt:

                               

Variable-rate debt

    33,630       33,630       36,899       36,899  

Fixed-rate debt

    984       1,029       1,007       1,046