Quarterly report pursuant to Section 13 or 15(d)

Common Stock Options, Warrants And Changes In Capitalization (Details)

v2.4.0.6
Common Stock Options, Warrants And Changes In Capitalization (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended 0 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Feb. 15, 2013
Utica Shale [Member]
acre
Dec. 24, 2012
Utica Shale [Member]
acre
Dec. 19, 2012
Utica Shale [Member]
acre
Dec. 17, 2012
Utica Shale [Member]
acre
Feb. 15, 2013
Common Stock [Member]
Public Offering [Member]
Jan. 07, 2013
Common Stock [Member]
Public Offering [Member]
Dec. 24, 2012
Common Stock [Member]
Public Offering [Member]
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items]                  
Issuance of common stock in public offering (shares)             8,912,500   11,750,000
Stock option, portion available to underwriters (shares)                 1,650,000
Stock option, portion attributable to underwriters (shares)               900,000 750,000
Share price (usd per share)             $ 38.00   $ 38.00
Proceeds from issuance of common stock, net of offering costs $ 357,640    $ 325,800 $ 460,700     $ 325,800   $ 460,700
Gas and oil acreage, undeveloped, net     22,000 37,000 7,000 30,000