Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

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RELATED PARTY TRANSACTIONS (Details) (Emerald [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Well
Sep. 30, 2013
Dec. 31, 2013
Emerald [Member]
     
Related Party Transaction [Line Items]      
Number of producing wells, gross 36    
Number of producing wells, net 6.9    
Number of drilling or awaiting completion wells, gross 10    
Number of drilling or awaiting completion wells, net 1.0    
Number of producing and drilling wells, gross 46    
Estimated total drilling and completion cost of wells attributable to entity $ 78    
Percentage interest that one of the Company's directors owned (in hundredths) 5.00%    
Accounts receivable from related parties 2.4   4.6
Accounts payable to related parties 12.9   23.2
Revenue from related party transactions $ 18.7 $ 0