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(5) Other Long-Term Assets and Other Income (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Other Assets, Noncurrent [Table Text Block]
   
September 30,
 2012
   
December 31,
2011
 
Other assets:
           
    Advance coal royalties
  $ 3,241     $ 3,205  
    Marketable equity securities available for sale at fair value (restricted)*
    3,633       2,326  
    Miscellaneous
    1,893       763  
    $ 8,767     $ 6,294  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Nine months ended
September 30,
   
2012
   
2011
 
Other income:
           
MSHA reimbursements
 
$
4,236
   
$
1,900
 
Other
   
702
      49  
   
$
4,938
   
$
1,949