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Financial instruments and fair value measurements (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Value of Financial Instruments

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:

 

     December 31,      June 30,  
     2012      2013  
     Carrying      Fair      Carrying      Fair  
     amount      value      amount      value  
     (In thousands)  

Cash and cash equivalents

   $ 63,777       $ 63,777       $ 52,736       $ 52,736   

Accounts receivable, net

     8,480         8,480         10,741         10,741   

Accounts payable

     2,797         2,797         2,710         2,710   

Long-term debt (including current maturities)

     18,480         18,480         17,980         17,980