Oil and Natural Gas Capitalized Costs (Tables)

6 Months Ended

Jun. 30, 2011

Notes To Financial Statements [Abstract]

Aggregate Capitalized Costs Related to Oil, Natural Gas and NGL Production Activities

Aggregate capitalized costs related to oil, natural gas and NGL production activities with applicable accumulated depletion and amortization are presented below:

	June 30, 2011			December 31, 2010
	(in thousands)
Proved properties:
Leasehold acquisition	$	5,505,535		$	4,695,704
Development		1,066,039			840,175
Unproved properties		169,093			128,624
		6,740,667			5,664,503
Less accumulated depletion and amortization		(855,314	)		(719,035	)
	$	5,885,353		$	4,945,468