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
6 Months Ended
Jun. 30, 2014
Well
Jun. 30, 2013
Dec. 31, 2013
Emerald [Member]
     
Related Party Transaction [Line Items]      
Number of producing wells, gross 26    
Number of producing wells, net 5.6    
Number of drilling or awaiting completion wells, gross 9    
Number of drilling or awaiting completion wells, net 1.1    
Number of producing and drilling wells, gross 35    
Estimated total drilling and completion cost of wells $ 358    
Estimated total drilling and completion cost of wells attributable to entity 67    
Percentage interest that one of the Company's directors owned (in hundredths) 5.00%    
Accounts receivable from related parties 4.1   4.6
Accounts payable to related parties 16.6   23.2
Revenue from related party transactions $ 12.75 $ 0