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Equity Investments (Tables)
3 Months Ended
Mar. 31, 2012
Equity Investments [Abstract]  
Investments Accounted For By The Equity Method
     March 31, 2012      December 31, 2011  

Investment in Tatex Thailand II, LLC

   $ 829,000       $ 1,030,000   

Investment in Tatex Thailand III, LLC

     8,731,000         8,282,000   

Investment in Grizzly Oil Sands ULC

     136,732,000         69,008,000   

Investment in Bison Drilling and Field Services LLC

     6,361,000         6,366,000   

Investment in Muskie Holdings LLC

     2,441,000         2,138,000   

Investment in Timber Wolf Terminals LLC

     1,000,000         —     

Investment in Windsor Midstream LLC

     7,080,000         —     
  

 

 

    

 

 

 
   $ 163,174,000       $ 86,824,000