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Major Lessees (Tables)
3 Months Ended
Mar. 31, 2012
Major Lessees [Abstract]  
Revenues from lessees that exceeded ten percent of total revenues
                                 
    Three Months Ended
March 31,
 
    2012   2011  
   

(Dollars in thousands)

(Unaudited)

 
    Revenues     Percent     Revenues   Percent  

Alpha Natural Resources

  $ 24,148       26   $24,842     29

The Cline Group

  $ 23,715       26   $14,430     17