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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
6. Inventories
Inventories are comprised of the following (in thousands):
                 
    September 30,     December 31,  
    2011     2010  
Inventories-gross
  $ 118,991     $ 104,029  
Impaired inventory
    (31,379 )     (31,370 )
 
           
 
    87,612       72,659  
Inventories included in other assets
    (1,426 )     (1,426 )
 
           
 
  $ 86,186     $ 71,233