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Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Plant and Equipment [Abstract]  
Plant and Equipment
                 
    December 31,
2011
    December 31,
2010
 
    (In thousands)  

Plant construction in process

  $ 78     $ 6,279  

Plant and equipment at cost

    67,175       81,906  

Less accumulated depreciation

    (21,068     (25,837
   

 

 

   

 

 

 

Net book value

  $ 46,185     $ 62,348  
   

 

 

   

 

 

 

 

                         
    For the years ended
December 31,
 
    2011     2010     2009  
    (In thousands)  

Total depreciation expense on plant and equipment

  $ 8,589     $ 8,322     $ 7,998