Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 2013

Business Acquisition [Line Items]

Business Acquisition, Pro Forma Information

Unaudited Pro Forma Acquisition Information.  The following combined pro forma total revenues and other income and net income are presented as if the previously discussed CCA acquisition, Bakken Exchange Transaction and Thompson Field acquisition had occurred on January 1, 2012:

	Year Ended December 31,
In thousands, except per-share data	2013		2012
Pro forma total revenues and other income	$	2,599,301	$	2,570,829
Pro forma net income	437,616		582,033
Pro forma net income per common share
Basic	$	1.19	$	1.51
Diluted	1.18		1.50

Cedar Creek Anticline [Member]

Business Acquisition [Line Items]

Schedule of Business Acquisitions

The following table presents a summary of the fair value of assets acquired and liabilities assumed in the CCA acquisition:

In thousands
Consideration
Cash consideration (1)	$	1,001,707
Fair value of assets acquired and liabilities assumed
Oil and natural gas properties
Proved properties	783,507
Unevaluated properties	222,820
Other assets	2,589
Asset retirement obligations	(7,209		)
	$	1,001,707

(1) See Note 6, Income Taxes, for additional information regarding the like-kind-exchange transaction utilized to fund this purchase and Note 13, Supplemental Cash Flow Information, for supplemental cash flow information regarding the cash payment.

Bakken Exchange Transaction [Member]

Business Acquisition [Line Items]

Schedule of Business Acquisitions

The following table presents a summary of the fair value of assets acquired and liabilities assumed in the Bakken Exchange Transaction:

In thousands
Consideration
Fair value of net assets transferred	$	1,866,107
Less: Fair value of assets acquired and liabilities assumed
Cash (1)	1,277,041
Oil and natural gas properties
Proved properties	182,289
Unevaluated properties	90,690
CO2 properties	314,505
Other property and equipment	23,424
Other assets	477
Other liabilities	(8,528		)
Asset retirement obligations	(13,791		)
Fair value of net assets acquired	$	1,866,107

(1) See Note 13, Supplemental Cash Flow Information, for additional information regarding the placement of $1.05 billion of the proceeds in a qualified trust in order to enable a like-kind exchange transaction for federal income tax purposes.

Thompson Field [Member]

Business Acquisition [Line Items]

Schedule of Business Acquisitions

The following table presents a summary of the fair value of assets acquired and liabilities assumed in the Thompson Field acquisition:

In thousands
Consideration
Cash consideration (1)	$	366,179
Less: Fair value of assets acquired and liabilities assumed
Oil and natural gas properties
Proved properties	305,233
Unevaluated properties	12,023
Pipelines and plants	2,000
Other assets	2,957
Asset retirement obligations	(3,306		)
	318,907
Goodwill	$	47,272

(1) See Note 6, Income Taxes, for additional information regarding the like-kind-exchange transaction utilized to fund this purchase and Note 13, Supplemental Cash Flow Information, for supplemental cash flow information regarding the cash payment.