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(6) Equity Investment in Savoy (Details) - Savoy: Oil and Gas Reserves 2 (Parentheticals)
Dec. 31, 2013
Proved Developed
  
Reserve Quantities [Line Items]  
Annual discount for estimated timing of cash flows 10.00%
PUDs
  
Reserve Quantities [Line Items]  
Annual discount for estimated timing of cash flows 10.00%
Total Proved
  
Reserve Quantities [Line Items]  
Annual discount for estimated timing of cash flows 10.00%