Crude Oil and Natural Gas Property Information (Tables)

12 Months Ended

Dec. 31, 2014

Oil and Gas Exploration and Production Industries Disclosures [Abstract]

Schedule of Results of Operations from Crude Oil and Natural Gas Producing Activities

The following table sets forth the Company’s consolidated results of operations from crude oil and natural gas producing activities for the years ended December 31, 2014, 2013 and 2012.

	Year ended December 31,
In thousands	2014			2013			2012
Crude oil and natural gas sales (1)	$	4,203,022		$	3,573,431		$	2,349,500
Production expenses	(352,472		)	(282,197		)	(195,440		)
Production taxes and other expenses (1)	(349,760		)	(298,787		)	(198,505		)
Exploration expenses	(50,067		)	(34,947		)	(23,507		)
Depreciation, depletion, amortization and accretion	(1,338,351		)	(953,796		)	(683,207		)
Property impairments	(616,888		)	(220,508		)	(122,274		)
Income taxes	(559,311		)	(659,783		)	(428,095		)
Results from crude oil and natural gas producing activities	$	936,173		$	1,123,413		$	698,472

(1) Natural gas transportation and processing charges totaling $33.3 million and $29.9 million for the years ended December 31, 2013 and 2012, respectively, have been reclassified from "Production taxes and other expenses" to "Crude oil and natural gas sales" to conform to the current year presentation as discussed in Note 1. Organization and Summary of Significant Accounting Policies.

Schedule of Costs Incurred in Oil and Gas Property Acquisition Exploration and Development Activities

Costs incurred, both capitalized and expensed, in connection with the Company’s consolidated crude oil and natural gas acquisition, exploration and development activities for the years ended December 31, 2014, 2013 and 2012 are presented below:

	Year ended December 31,
In thousands	2014		2013		2012
Property Acquisition Costs:
Proved	$	48,917	$	16,604	$	738,415
Unproved	409,529		546,881		745,601
Total property acquisition costs	458,446		563,485		1,484,016
Exploration Costs	863,606		687,767		857,681
Development Costs	3,670,448		2,549,203		1,975,660
Total	$	4,992,500	$	3,800,455	$	4,317,357

Schedule of Aggregate Capitalized Costs Related to Crude Oil and Natural Gas Producing Activities

Aggregate capitalized costs relating to the Company’s consolidated crude oil and natural gas producing activities and related accumulated depreciation, depletion and amortization as of December 31, 2014 and 2013 are as follows:

	December 31,
In thousands	2014			2013
Proved crude oil and natural gas properties	$	17,045,967		$	12,423,878
Unproved crude oil and natural gas properties	966,080			1,181,268
Total	18,012,047			13,605,146
Less accumulated depreciation, depletion and amortization	(4,601,864		)	(3,083,180		)
Net capitalized costs	$	13,410,183		$	10,521,966

Schedule of Capitalized Exploratory Drilling Costs Pending Evaluation

The following table presents the amount of capitalized exploratory drilling costs pending evaluation at December 31 for each of the last three years and changes in those amounts during the years then ended:

	Year ended December 31,
In thousands	2014			2013			2012
Balance at January 1	$	152,775		$	92,699		$	128,123
Additions to capitalized exploratory well costs pending determination of proved reserves	627,853			548,933			485,530
Reclassification to proved crude oil and natural gas properties based on the determination of proved reserves	(671,618		)	(479,507		)	(520,187		)
Capitalized exploratory well costs charged to expense	(15,589		)	(9,350		)	(767		)
Balance at December 31	$	93,421		$	152,775		$	92,699
Number of gross wells	119			67			46