Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2011

Long-Term Debt

Summary of debt

	June 30, 2011		December 31, 2010
Credit Facility
Revolving credit facility, 4.22% average interest due July 2015	$	246,500	$	—
Senior Notes (1)
Senior Notes, 8.5% interest, net of discount of $6 and $642, respectively, issued July 2006 and due July 2016	2,784		274,358
Senior Notes, 8.75% interest, net of discount of $576 and $924, respectively, issued April and May 2008 and due April 2018	333,786		499,076
Senior Notes, 6.75% interest, issued November 2010 and due November 2020	500,000		500,000
Senior Notes, 6.5% interest, net of discount of $968, issued February and March 2011 and due August 2021	499,032		—
Total long-term debt	$	1,582,102	$	1,273,434

(1) The estimated aggregate fair value of the senior notes (collectively, the “Senior Notes”) was approximately $1,366.2 million and $1,333.9 million as of June 30, 2011 and December 31, 2010, respectively, based on quoted market prices.