Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Details)

v2.4.0.6
Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related Party Transaction [Line Items]      
Lease operating expenses $ 20,897,000 $ 17,614,000 $ 16,316,000
Oil and natural gas properties 1,035,754,000 747,344,000  
Windsor [Member]
     
Related Party Transaction [Line Items]      
Due to related party (5,593,000) (5,871,000)  
Lease operating expenses 5,489,000 2,386,000  
Oil and natural gas properties 50,614,000 21,666,000  
Athena [Member]
     
Related Party Transaction [Line Items]      
Due to related party (676,000) (791,000)  
Lease operating expenses 423,000 438,000  
Oil and natural gas properties 2,851,000 2,554,000  
Directional [Member]
     
Related Party Transaction [Line Items]      
Due to related party (2,449,000) (952,000)  
Oil and natural gas properties 6,068,000 3,008,000  
Pressure Control [Member]
     
Related Party Transaction [Line Items]      
Due to related party   (80,000)  
Oil and natural gas properties   80,000  
Black Fin [Member]
     
Related Party Transaction [Line Items]      
Due to related party (436,000)    
Oil and natural gas properties $ 436,000 $ 826,000