Revenues (Tables)

12 Months Ended

Dec. 31, 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.

	Year ended December 31, 2018
In thousands	New Standard			Prior Presentation			Change
Revenues:
Crude oil and natural gas sales	$	4,678,722		$	4,487,135		$	191,587
Loss on natural gas derivatives, net	(23,930		)	(23,930		)	—
Crude oil and natural gas service operations	54,794			54,794			—
Total revenues	$	4,709,586		$	4,517,999		$	191,587
Operating costs and expenses:
Transportation expenses	$	191,587		$	—		$	191,587
Net income	$	989,700		$	989,700		$	—

Disaggregation of Revenue [Table Text Block]

The following table presents the disaggregation of the Company's crude oil and natural gas revenues for the year ended December 31, 2018.

	Year ended December 31, 2018
In thousands	North Region		South Region		Total
Crude oil revenues:
Operated properties	$	2,330,711	$	603,070	$	2,933,781
Non-operated properties	790,435		68,378		858,813
Total crude oil revenues	3,121,146		671,448		3,792,594
Natural gas revenues:
Operated properties	214,741		547,247		761,988
Non-operated properties	60,738		63,402		124,140
Total natural gas revenues	275,479		610,649		886,128
Crude oil and natural gas sales	$	3,396,625	$	1,282,097	$	4,678,722
Timing of revenue recognition
Goods transferred at a point in time	$	3,396,625	$	1,282,097	$	4,678,722
Goods transferred over time	—		—		—
	$	3,396,625	$	1,282,097	$	4,678,722