Long-Term Debt (Details) (USD $)			1 Months Ended					3 Months Ended							3 Months Ended										1 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Oct. 31, 2013 7.75% Senior Notes due 2019	Apr. 30, 2011 7.75% Senior Notes due 2019	Mar. 31, 2011 7.75% Senior Notes due 2019	Mar. 31, 2014 7.75% Senior Notes due 2019	Dec. 31, 2013 7.75% Senior Notes due 2019	Mar. 31, 2014 7.75% Senior Notes due 2019 Beginning on April 1, 2015	Mar. 31, 2014 7.75% Senior Notes due 2019 Beginning on April 1, 2016	Mar. 31, 2014 7.75% Senior Notes due 2019 On or after April 1, 2017	Mar. 31, 2014 Revolving credit facility, due April 2019 Quarter		Dec. 31, 2013 Revolving credit facility, due April 2019		Mar. 31, 2014 Revolving credit facility, due April 2019 Minimum	Mar. 31, 2014 Revolving credit facility, due April 2019 Maximum	Mar. 31, 2014 Revolving credit facility, due April 2019 LIBOR	Mar. 31, 2014 Revolving credit facility, due April 2019 LIBOR Minimum	Mar. 31, 2014 Revolving credit facility, due April 2019 LIBOR Maximum	Mar. 31, 2014 Revolving credit facility, due April 2019 Prime rate	Mar. 31, 2014 Revolving credit facility, due April 2019 Federal funds rate	Mar. 31, 2014 Revolving credit facility, due April 2019 Base rate Minimum	Mar. 31, 2014 Revolving credit facility, due April 2019 Base rate Maximum	Mar. 31, 2014 Revolving credit facility, due April 2019 One-month LIBOR	Apr. 30, 2014 Subsequent Event [Member] Revolving credit facility, due April 2019 Bank	Mar. 31, 2014 Through Fourth Quarter of 2014 [Member] Revolving credit facility, due April 2019 Maximum
Long-Term Debt
Long-term debt	$ 599,653,000	$ 639,638,000				$ 599,653,000	$ 599,638,000				$ 0	[1]	$ 40,000,000	[1]
Aggregate principal amount of notes issued			250,000,000	50,000,000	300,000,000
Interest rate (as a percent)					7.75%	7.75%	7.75%
Original issue discount (as a percent)				1.00%
Unamortized original issue discount				500,000		347,000	362,000
Redemption price of debt instrument (as a percent)								103.875%	101.938%	100.00%
Number of banks syndicated to provide for line of credit																									16
Maximum borrowing capacity																									1,000,000,000
Initial borrowing base											415,000,000
Interest rate decrease upon amendment																									25.00%
Outstanding letters of credit											5,100,000
Amount available under the revolving credit facility											$ 409,900,000
Percentage of adjusted engineered value of oil and gas interests serving as collateral															80.00%
Variable rate basis																	LIBOR			prime rate	federal funds rate			one-month LIBOR
Applicable margin (as a percent)																		1.50%	2.50%		0.50%	0.50%	1.50%	1.00%
Commitment fee on unused portion (as a percent)															0.375%	0.50%
Effective annual interest rate (as a percent)											2.10%
Current ratio															1
Number of consecutive quarters for which ratio of consolidated funded indebtedness to consolidated EBITDAX is required to be maintained											4
Consolidated funded indebtedness to consolidated EBITDAX ratio																4										4.5

[1] Renewed and extended in April 2014.