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(6) Other Long-Term Assets and Other Income (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Other Assets, Noncurrent [Table Text Block]
   
March 31,
2013
   
December 31,
 2012
 
             
Long-term assets:
           
Advance coal royalties
  $ 3,461     $ 3,324  
Deferred financing costs, net
    1,419       1,494  
Marketable equity securities available for sale, at fair value (restricted)*
    5,054       3,548  
   Miscellaneous
    2,432       2,941  
    $ 12,366     $ 11,307  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
 Three months ended
 March 31,
 
   
2013
   
2012
 
Other income:
           
   MSHA reimbursements*
  $ 2,053     $ 2,336  
   Miscellaneous
    408       126  
    $ 2,461     $ 2,462