Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Notes To Financial Statements [Abstract]

Minimum commitments for unrecorded unconditional purchase obligations

At December 31, 2011, total minimum commitments from long-term non-cancelable operating leases, drilling rig commitments, seismic purchase obligations, fracturing services obligations, other purchase obligations and transportation and storage service commitments, based on current transportation and storage rates and the foreign currency exchange rates used to convert Canadian dollars and British pounds into United States dollars at December 31, 2011, are as follows (in thousands):

	Total Minimum
	Commitments
2012	$	1,185,759
2013 - 2014		1,013,735
2015 - 2016		925,514
2017 and beyond		1,435,506
	$	4,560,514