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Financial instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule to Carrying Value and Estimated Fair Value of Financial Instruments

The following table presents the carrying value and estimated fair value of our financial instruments:

 

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

Accounts receivable, net

   $ 46,852       $ 46,852       $ 66,805       $ 66,805   

Accounts payable

     8,424         8,424         13,186         13,186   

Debt:

           

Variable-rate debt

     34,403         34,403         47,214         47,214   

Fixed-rate debt

     1,031         1,058         1,044         1,066