Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 4)

v2.4.1.9
Derivative Instruments (Details 4) (Revenue, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue
   
Summary of realized and unrealized gains (losses) on derivative instruments    
Commodity derivative fair value gains $ 759,554us-gaap_GainLossOnSaleOfCommodityContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
$ (248,929)us-gaap_GainLossOnSaleOfCommodityContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember