Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2011

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Six Months Ended
	June 30,
	2011		2010
	(in thousands)
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$	12,717	$	864
Unproved property purchased with stock(a)	$	—	$	20,000
Net cash provided from operating activities included:
Interest paid	$	68,002	$	58,457
Income taxes paid (refunded)	$	308	$	(684	)

^(a) Six months ended June 30, 2010 included shares that were issued in January 2010 while the value was accrued and included in costs incurred for the year ended December 31, 2009.