Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 2012

Bakken Exchange Transaction [Member]

Business Acquisition [Line Items]

Schedule of Purchase Price Allocation [Table Text Block]

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

In thousands
Consideration:
Fair value of net assets transferred	$	1,903,280
Less: Fair value of assets acquired and liabilities assumed: (1)
Cash (2)	1,331,684
Oil and natural gas properties
Proved	201,301
Unevaluated	98,635
CO2 properties	314,505
Other assets	477
Other liabilities	(29,531		)
Asset retirement obligations	(13,791		)
Fair value of net assets acquired	$	1,903,280

(1) Fair value of the assets acquired and liabilities assumed is preliminary, pending final closing adjustments and further evaluation of reserves and asset retirement obligations.

(2) Cash proceeds include preliminary closing adjustments of $41.7 million primarily representing adjustments for net revenues and capital expenditures of the transferred oil and natural gas property assets from the Bakken Exchange Transaction effective date to the closing dates. Also see Note 12, Supplemental Information and Note 13, Subsequent Events, for additional information regarding the placement of $1.05 billion of the proceeds in a qualified trust to facilitate an anticipated like-kind-exchange transaction for federal income tax purposes.

Thompson Field [Member]

Business Acquisition [Line Items]

Schedule of Purchase Price Allocation [Table Text Block]

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 payment (1)	$	366,179
Less: Fair value of assets acquired and liabilities assumed:
Oil and natural gas properties
Proved	305,233
Unevaluated	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 12, Supplemental Information, for supplemental cash flow information regarding the cash payment.

Riley Ridge Phase 2 [Member]

Business Acquisition [Line Items]

Schedule of Purchase Price Allocation [Table Text Block]

acquisitions of Riley Ridge meets the definition of a business under the FASC Business Combinations topic.  As such, we estimated the fair value of assets acquired and liabilities assumed using a discounted net cash flow model. Goodwill associated with the acquisitions is deductible for income tax purposes.  The fair values assigned to assets acquired and liabilities assumed in the August 2011 acquisition have been finalized, and no adjustments have been made to fair value amounts previously disclosed in our Form 10-K for the period ended December 31, 2011. The following table presents a summary of the fair value of assets acquired and liabilities assumed in the August 2011 Riley Ridge acquisition:

In thousands
Consideration:
Cash payment	$	199,779
Deferred payment	15,000
Total consideration	214,779
Less: Fair value of assets acquired and liabilities assumed:
Oil and natural gas properties
Proved	48,731
Unproved	12,542
CO2 properties	9,741
Pipelines and plants	91,594
Other assets (1)	48,660
Asset retirement obligations	(389		)
	210,879
Goodwill	$	3,900

(1) Other assets includes helium extraction rights of $36.7 million.  Helium reserves at Riley Ridge are owned by the U.S. government.  The fair value assigned to helium extraction rights was calculated using the income approach and represents the discounted future net revenues associated with our right to extract and sell the helium on behalf of the helium resource owners.  Upon commencement of helium production, helium extraction rights will be amortized on a unit-of-production basis.

Bakken and Thompson Transactions [Member]

Business Acquisition [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

Unaudited Pro Forma Acquisition Information.  The following combined pro forma total revenues and other income and net income are presented as if the Bakken Exchange Transaction and Thompson Field acquisition had occurred on January 1, 2011:

	Year Ended December 31,
In thousands, except per share data	2012		2011
Pro forma total revenues and other income	$	2,203,703	$	2,184,507
Pro forma net income	454,549		523,227
Pro forma net income per common share
Basic	$	1.18	$	1.32
Diluted	1.17		1.30

Encore Acquisition [Member]

Business Acquisition [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

 The following combined pro forma total revenues and other income and net income attributable to Denbury stockholders are presented as if the acquisition of Encore occurred on January 1, 2010:

In thousands, except per share data	Year Ended December 31, 2010
Pro forma total revenues and other income	$	2,098,241
Pro forma net income attributable to Denbury stockholders	286,891
Pro forma net income per common share
Basic	$	0.73
Diluted	0.72