Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Summary Financial Information for Company's Reportable Segments Table

	Exploration
	and			Midstream
	Production			Services		Other		Total
	(in thousands)
2012
Revenues from external customers	$	1,949,674		$	765,255	$	114	$	2,715,043
Intersegment revenues		(1,452)			1,598,225		2,751		1,599,524
Operating income (loss)(1)		(1,411,211)			294,302		1,333		(1,115,576)
Other income (loss), net		(1,156)			132		2,054		1,030
Depreciation, depletion and amortization expense		765,368			44,395		1,190		810,953
Impairment of natural gas and oil properties		1,939,734			–		–		1,939,734
Interest expense(2)		20,315			14,341		1,001		35,657
Provision (benefit) for income taxes(2)		(548,556)			104,522		895		(443,139)
Assets		5,193,733	(3)		1,273,228		270,566		6,737,527
Capital investments(4)		1,860,681			164,978		54,860		2,080,519
2011
Revenues from external customers	$	2,088,763		$	864,096	$	47	$	2,952,906
Intersegment revenues		11,725			1,995,423		3,221		2,010,369
Operating income		825,138			247,952		1,711		1,074,801
Other income (loss), net		328			(91)		27		264
Depreciation, depletion and amortization expense		666,125			37,261		1,125		704,511
Interest expense(2)		9,026			15,049		–		24,075
Provision for income taxes(2)		322,714			90,221		286		413,221
Assets		6,547,117	(3)		1,119,861		235,919		7,902,897
Capital investments(4)		1,977,493			160,776		68,905		2,207,174
2010
Revenues from external customers	$	1,871,835		$	738,828	$	–	$	2,610,663
Intersegment revenues		18,609			1,715,012		984		1,734,605
Operating income		829,462			191,566		200		1,021,228
Other income, net		235			179		13		427
Depreciation, depletion and amortization expense		561,018			28,765		549		590,332
Interest expense(2)		7,888			18,275		–		26,163
Provision for income taxes(2)		323,748			67,834		77		391,659
Assets		4,849,478	(3)		1,016,563		151,422		6,017,463
Capital investments(4)		1,775,518			271,316		73,231		2,120,065