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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2011
Related Party Transaction [Line Items]  
Summary of reimbursements
                         
    For the Years Ended
December 31,		  
    2011     2010     2009  
    (In thousands)  

Reimbursement for services

   $ 9,136     $ 7,358     $ 6,822  
   

 

 

    

 

 

    

 

 

  
Cline Affiliates [Member]
  
Related Party Transaction [Line Items]  
Summary of revenues from related party
                         
    For The Year Ended
December 31,		  
    2011     2010     2009  
    (In thousands)  

Coal royalty revenues

   $ 42,474     $ 32,407     $ 23,325  

Processing fees

     2,975       1,337       193  

Transportation fees

     16,689       14,324       11,495  

Minimums recognized as revenue

     —       12,400       —  

Override revenue

     2,691       1,904       2,356  
   

 

 

    

 

 

    

 

 

  
    $ 64,829     $ 62,372     $ 37,369  
   

 

 

    

 

 

    

 

 

  
Taggart Global USA, LLC [Member]
  
Related Party Transaction [Line Items]  
Summary of revenues from related party
                         
    For the Years Ended
December 31,		  
    2011     2010     2009  
    (In thousands)  

Processing revenue

   $ 9,755     $ 5,874     $ 3,872  
   

 

 

    

 

 

    

 

 

  
Kopper-Glo [Member]
  
Related Party Transaction [Line Items]  
Summary of revenues from related party
                         
    For the Years Ended
December 31,		  
    2011     2010     2009  
    (In thousands)  

Coal royalty revenues

   $ 1,629     $ 1,545     $ 1,560