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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent events On April 4, 2012, we entered into an agreement to divest certain of our mature oil and natural gas properties located in southern Oklahoma for a cash price of $37,000 subject to post-closing adjustments. The sale is expected to close by May 30, 2012. The properties included in the sale accounted for approximately 1% of our total production during the first quarter of 2012 and 2011. On April 17, 2012, we entered into an amendment to our senior secured revolving credit facility to increase the amount of additional debt permitted thereunder by $75,000 in connection with an offering of Senior Notes. On May 2, 2012, we issued $400,000 aggregate principal amount of 7.625% Senior Notes maturing on November 15, 2022. We used the net proceeds from the 7.625% Senior Notes to consummate a tender offer for all of our 8.875% Senior Notes due 2017, to redeem the 8.875% Senior Notes not purchased in the tender offer, and for general corporate purposes. In connection with the issuance of the 7.625% Senior Notes and the repurchase or redemption of our 8.875% Senior Notes due 2017, we capitalized approximately $8,500 of issuance costs related to underwriting and other fees and we expensed approximately $21,700 of refinancing costs in May 2012.