Costs Incurred for Property Acquisition Exploration and Development (Tables)

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

	Six Months		Year
	Ended		Ended
	June 30,		December 31,
	2011		2010
	(in thousands)
Acquisitions:
Unproved leasehold	$	—	$	3,697
Proved properties		—		130,767
Asset retirement obligations		—		556
Acreage purchases		67,140		151,572
Development		476,702		727,720
Exploration:
Drilling		68,936		50,433
Expense		36,513		56,298
Stock-based compensation expense		2,266		4,209
Gas gathering facilities:
Development		11,540		19,627
Subtotal		663,097		1,144,879
Asset retirement obligations		12,716		(6,370	)
Total costs incurred – continuing operations		675,813		1,138,509
Discontinued operations		3,502		73,369
Total costs incurred	$	679,315	$	1,211,878

^(a) Includes costs incurred whether capitalized or expensed and include our Barnett operations.