|
Common Stock Options, Warrants And Changes In Capitalization (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 96 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
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
|
Mar. 31, 2002
Private Placement [Member]
|
Dec. 31, 2012
Private Placement [Member]
|
Nov. 13, 2013
Common Stock [Member]
Public Offering [Member]
|
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]
|
Dec. 05, 2011
Common Stock [Member]
Public Offering [Member]
|
Jul. 15, 2011
Common Stock [Member]
Public Offering [Member]
|
Mar. 30, 2011
Common Stock [Member]
Public Offering [Member]
|
Dec. 31, 2013
1999 Stock Option Plan [Member]
Common Stock [Member]
|
Dec. 31, 2012
1999 Stock Option Plan [Member]
Common Stock [Member]
|
Dec. 31, 2012
2005 Stock Incentive Plan [Member]
Common Stock [Member]
|
Apr. 20, 2006
2005 Stock Incentive Plan [Member]
Common Stock [Member]
|
Apr. 19, 2006
2005 Stock Incentive Plan [Member]
Common Stock [Member]
|
Apr. 19, 2013
2013 Restated Stock Incentive Plan [Member]
Common Stock [Member]
|
Apr. 20, 2006
2013 Restated Stock Incentive Plan [Member]
Common Stock [Member]
|
|
| Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 883,000 | 3,000,000 | 1,904,606 | 7,500,000 | 3,000,000 | |||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Options Granted | 627,337 | 627,337 | ||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 997,269 | |||||||||||||||||||||||
| Issuance of common stock in public offering (shares) | 7,475,000 | 8,912,500 | 11,750,000 | 4,600,000 | 3,450,000 | 2,760,000 | ||||||||||||||||||
| 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) | $ 56.75 | $ 38.00 | $ 38.00 | $ 29.00 | $ 28.75 | $ 32.00 | ||||||||||||||||||
| Proceeds from issuance of common stock, net of offering costs | $ 766,495 | $ 427,091 | $ 307,154 | $ 325,800 | $ 460,700 | $ 408,000 | $ 325,800 | $ 460,700 | $ 128,000 | $ 94,700 | $ 84,300 | |||||||||||||
| Private Placement Units Offered | 10,000 | |||||||||||||||||||||||
| Class of Warrant or Right Number of Securities Called by Each Warrant or Right | 250 | |||||||||||||||||||||||
| Common stock, par value (usd per share) | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||
| Preferred stock dividend rate | 12.00% | 12.00% | 15.00% | |||||||||||||||||||||
| Preferred Stock, Dividend Rate, Stock, Percentage | 12.00% | |||||||||||||||||||||||
| Class of Warrant or Right, Outstanding | 2,322,962 | |||||||||||||||||||||||
| Term Of Warrants Expiration | 10 years | |||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights | 1.19 | |||||||||||||||||||||||
| Gas and oil acreage, undeveloped, net | 22,000 | 37,000 | 7,000 | 30,000 | ||||||||||||||||||||
| Class Of Warrant Or Right, Expired | 8,875 | |||||||||||||||||||||||