Revenues (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]

The following table reflects the change in presentation of revenues and applicable expenses on the Company's 2018 results under the new and previous guidance.

	Three months ended June 30, 2018								Six months ended June 30, 2018
In thousands	New Standard			Prior Presentation			Change		New Standard			Prior Presentation			Change
Revenues:
Crude oil and natural gas sales	$	1,137,528		$	1,090,274		$	47,254	$	2,251,380		$	2,154,829		$	96,551
Loss on natural gas derivatives, net	(12,685		)	(12,685		)	—		(2,511		)	(2,511		)	—
Crude oil and natural gas service operations	12,270			12,270			—		29,272			29,272			—
Total revenues	$	1,137,113		$	1,089,859		$	47,254	$	2,278,141		$	2,181,590		$	96,551
Operating costs and expenses:
Transportation expenses	$	47,254		$	—		$	47,254	$	96,551		$	—		$	96,551
Net income	$	242,464		$	242,464		$	—	$	476,410		$	476,410		$	—

Disaggregation of Revenue [Table Text Block]

The following table presents the disaggregation of the Company's crude oil and natural gas revenues for the three and six months ended June 30, 2018.

	Three months ended June 30, 2018						Six months ended June 30, 2018
In thousands	North Region		South Region		Total		North Region		South Region		Total
Crude oil revenues:
Operated properties	$	587,582	$	145,603	$	733,185	$	1,156,794	$	284,056	$	1,440,850
Non-operated properties	196,301		17,398		213,699		379,188		33,127		412,315
Total crude oil revenues	783,883		163,001		946,884		1,535,982		317,183		1,853,165
Natural gas revenues:
Operated properties	41,425		121,188		162,613		93,245		248,442		341,687
Non-operated properties	13,982		14,049		28,031		27,661		28,867		56,528
Total natural gas revenues	55,407		135,237		190,644		120,906		277,309		398,215
Crude oil and natural gas sales	$	839,290	$	298,238	$	1,137,528	$	1,656,888	$	594,492	$	2,251,380
Timing of revenue recognition
Goods transferred at a point in time	$	839,290	$	298,238	$	1,137,528	$	1,656,888	$	594,492	$	2,251,380
Goods transferred over time	—		—		—		—		—		—
	$	839,290	$	298,238	$	1,137,528	$	1,656,888	$	594,492	$	2,251,380