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, 2012
Dec. 31, 2011
Dec. 31, 2010
Related Party Transaction [Line Items]      
Lease operating expenses $ 24,308,000 $ 20,897,000 $ 17,614,000
Affiliates participation ratio 50.00%    
General and administrative 13,808,000 8,074,000 6,063,000
Diamondback Energy, Inc [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party (269,000) (5,593,000)  
Lease operating expenses 7,089,000 5,489,000  
Oil and natural gas properties 40,354,000 50,614,000  
Windsor Niobrara LLC [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party 173,000 3,557,000  
Revenue from related parties 7,545,000 6,642,000  
Windsor Ohio LLC [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party 6,520,000 0  
Revenue from related parties 163,650,000 93,871,000  
Liddell [Member]
     
Related Party Transaction [Line Items]      
Revenue from related parties 2,020,000    
Ownership percentage 10.00%    
Payments for ownership interest 102,000    
Rhino [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party 4,257,000 0  
Revenue from related parties 4,443,000 25,862,000  
Athena [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party (1,453,000) (676,000)  
Lease operating expenses 422,000 423,000  
Oil and natural gas properties 5,009,000 2,851,000  
Directional [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party   (2,449,000)  
Oil and natural gas properties   6,068,000  
Black Fin [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party 0 (436,000)  
Oil and natural gas properties 650,000 436,000  
Caliber [Member]
     
Related Party Transaction [Line Items]      
Due from (to) related party (12,000) (2,000)  
General and administrative $ 63,000 $ 18,000