Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.0.8
Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2013
MBoe
Dec. 31, 2012
MBoe
Feb. 15, 2013
Utica Shale [Member]
Dec. 21, 2012
Utica Shale [Member]
Dec. 18, 2012
Utica Shale [Member]
Dec. 19, 2012
Utica Shale [Member]
Feb. 26, 2014
Subsequent Event [Member]
Utica Shale [Member]
MBoe
acre
Jan. 31, 2013
Subsequent Event [Member]
Natural Gas Fixed Swap, May 2014 Through December 2015 [Member]
Swap [Member]
Gas [Member]
MMBTU
Jan. 31, 2013
Subsequent Event [Member]
Natural Gas Fixed Swap, June 2014 Through December 2015 [Member]
Swap [Member]
Gas [Member]
MMBTU
Derivative [Line Items]                  
Notional quantity               25,000 25,000
Average fixed price               4.20 4.21
Purchase commitment, for additional acreage             8,200    
Purchase commitment for additional BOEPD 27,805,000 6,675,000         1,000    
Purchase price commitment     $ 220.0 $ 70.0 $ 302.0 $ 372.0 $ 185.0