Costs Incurred for Property Acquisition, Exploration and Development (Tables)

9 Months Ended

Sep. 30, 2012

Costs Incurred for Property Acquisition, Exploration and Development

	Nine Months Ended September 30, 2012		Year Ended December 31, 2011
	(in thousands)
Acreage purchases	$	173,718	$	220,576
Development		855,650		1,007,049
Exploration:
Drilling		268,328		226,920
Expense		48,738		77,259
Stock-based compensation expense		3,047		4,108
Gas gathering facilities:
Development		32,520		53,387
Subtotal		1,382,001		1,589,299
Asset retirement obligations		29,695		24,061
Total – Continuing operations		1,411,696		1,613,360
Discontinued operations		—		3,241
Total costs incurred	$	1,411,696	$	1,616,601

^(a) Includes cost incurred whether capitalized or expensed.