Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Schedule Of Property, Plant And Equipment

	As of December 31,
	2013			2012
	(In thousands)
Oil and gas properties
Subject to depletion	$	5,687,557		$	5,770,913
Unevaluated costs	221,605			307,267
Accumulated depletion	(5,268,719		)	(5,297,220		)
Net oil and gas properties	640,443			780,960
Other property and equipment
Pipelines and processing facilities	347,093			375,248
General properties	72,125			75,147
Accumulated depreciation	(198,856		)	(202,297		)
Net other property and equipment	220,362			248,098
Property, plant and equipment, net of accumulated depletion and depreciation	$	860,805		$	1,029,058

Schedule Of Charges For Impairment

		Pre-tax Charges for Impairment
	Segment	2013		2012		2011
		(in thousands)
U.S.
Oil and gas properties	Exploration and production	$	—	$	2,152,128	$	—
Other property and equipment	Midstream	54		7,328		57,996
Other property and equipment	Exploration and production	1,809		537		—
Canada
Oil and gas properties	Exploration and production	—		465,935		49,063
		$	1,863	$	2,625,928	$	107,059

Schedule Of Unevaluated Natural Gas And Oil Properties Not Subject To Depletion

	December 31, 2013 Costs Incurred During										December 31, 2012 Costs Incurred During
	2013		2012		2011		Prior		Total		2012		2011		2010		Prior		Total
	(In thousands)										(In thousands)
U.S.
Acquisition costs	$	—	$	3,013	$	13,484	$	—	$	16,497	$	6,844	$	42,339	$	1,447	$	32,429	$	83,059
Exploration costs	14		364		—		—		378		2,676		207		—		—		2,883
Capitalized interest	1,093		1,374		—		—		2,467		4,093		—		—		—		4,093
Total U.S.	$	1,107	$	4,751	$	13,484	$	—	$	19,342	$	13,613	$	42,546	$	1,447	$	32,429	$	90,035
Canada
Acquisition costs	$	—	$	2,956	$	1,300	$	68,586	$	72,842	$	333	$	—	$	643	$	80,488	$	81,464
Exploration costs	$	7,044	$	31,746	$	41,092	$	30,413	$	110,295	$	36,356	$	44,837	$	18,500	$	20,171	$	119,864
Capitalized interest	$	3,947	$	2,724	$	3,522	$	8,933	$	19,126	$	2,796	$	3,614	$	2,830	$	6,664	$	15,904
Total Canada	$	10,991	$	37,426	$	45,914	$	107,932	$	202,263	$	39,485	$	48,451	$	21,973	$	107,323	$	217,232
Total	$	12,098	$	42,177	$	59,398	$	107,932	$	221,605	$	53,098	$	90,997	$	23,420	$	139,752	$	307,267

Schedule Of Unevaluated Property Costs

	As of December 31,
	2013		2012
	(In thousands)
Barnett Shale	$	—	$	40,716
West Texas	19,343		49,318
Horn River Basin	202,262		217,233
Total	$	221,605	$	307,267