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Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2012
Plant and Equipment [Abstract]  
Plant and Equipment
                 
    March 31,
2012
    December 31,
2011
 
    (In thousands)  
    (Unaudited)        

Plant construction in process

  $ 80     $ 78  

Plant and equipment at cost

    77,302       67,175  

Less accumulated depreciation

    (22,966     (21,068
   

 

 

   

 

 

 

Net book value

  $ 54,416     $ 46,185  
   

 

 

   

 

 

 

 

                 
    Three months ended
March  31,
 
    2012     2011  
    (In thousands)  
    (Unaudited)  

Total depreciation expense on plant and equipment

  $ 1,898     $ 2,081