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Financial Instruments and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Financial Instruments and Fair Value Measurements [Abstract]  
Financial instruments that required fair value disclosure
                                 
    December 31,
2011
    June 30,
2012
 
    Carrying
amount
    Fair
value
    Carrying
amount
    Fair
value
 
    (In thousands)  

Cash and cash equivalents

  $ 10,081     $ 10,081     $ 5,178     $ 5,178  

Accounts receivable, net

    14,246       14,246       17,450       17,450  
         

Accounts payable

    6,203       6,203       6,426       6,426  

Long-term debt (including current maturities)

    24,185       24,185       22,926       22,926