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Commitments and Contingencies (Details) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Minimum	Dec. 31, 2012 Minimum	Dec. 31, 2011 Maximum	Dec. 31, 2012 Maximum
Natural gas and liquids transportation agreements initial term					4 years		23 years
2013	$ 94,714,000
2014	98,145,000
2015	115,203,000
2016	126,973,000
2017	121,923,000
Thereafter	1,156,294,000
Future minimum obligations of natural gas and liquids transportation agreements	1,713,252,000
Drilling Rig Commitments
Drilling rig commitment term				2 years		3 years
Drilling Rig Commitments
2013	17,900,000
2014	9,200,000
Lease Commitments
Rent expense	11,600,000	13,600,000	18,300,000
Future minimum rental commitments under non-cancelable leases
2013	5,106,000
2014	4,652,000
2015	3,624,000
2016	730,000
2017	192,000
Aggregate future minimum rental commitments	$ 14,304,000

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