Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2015

Property and Equipment

Schedule of property and equipment

	March 31, 2015			December 31, 2014
	(in thousands)
Oil and gas properties, on the basis of full-cost accounting:
Proved properties	$	3,491,783		$	3,398,146
Unevaluated properties	41,193			44,535
Other property and equipment	13,845			13,454
Less accumulated depreciation, depletion, amortization and impairment	(1,566,043		)	(1,333,019		)
Net property and equipment	$	1,980,778		$	2,123,116

Schedule of internal costs capitalized

	Three Months Ended March 31,
	2015		2014
Internal costs capitalized to oil and gas properties (1)	$	2,302	$	3,124

(1) Inclusive of $0.5 million of qualifying share-based compensation expense for the three months ended March 31, 2015 and 2014.

Schedule of depletion expense related to oil and gas properties

	Three Months Ended March 31,
	2015		2014		2015		2014
	(in thousands)				(per Boe)
Depletion expense	$	57,605	$	66,204	$	18.73	$	25.37
Depreciation on other property	823		697		0.27		0.26
Depreciation, depletion, and amortization	$	58,428	$	66,901	$	19.00	$	25.63