Annual report pursuant to Section 13 and 15(d)

财产及设备 (Narrative) (Details)

v2.4.0.6
财产及设备 (Narrative) (Details) (USD $)
 12个月结束
12月. 31, 2011
12月. 31, 2010
12月. 31, 2009
Property, Plant and Equipment [Line Items]      
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool $ 23,494,000 $ 18,126,000  
Capitalized general and administrative costs 5,368,000 4,117,000 3,395,000
西德克萨斯二叠纪[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 9,831,000    
Belize Properties[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 5,711,000    
Bakken Properties[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 303,000    
Colorado Properties{成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 4,163,000    
南路易斯安那资产[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 161,000    
俄亥俄州租赁权成本[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization 118,420,000    
其他项目[成员]
      
Property, Plant and Equipment [Line Items]      
Non-producing leasehold costs excluded from amortization $ 34,000