Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Reclassification of Purchased Oil and Gas [Table Text Block]

The following individual line items were affected in addition to total revenues and other income, and total costs and expenses:



	Year Ended December 31,
	2012		2011
	(in thousands)
Sales of purchased oil and gas, as previously reported	$	—	$	—
Revision of sales of purchased oil and gas	122,093		14,542
Sales of purchased oil and gas, reported herein	$	122,093	$	14,542

Purchased oil and gas, as previously reported	$	—	$	—
Revision of purchased oil and gas	120,408		13,949
Purchased oil and gas, reported herein	$	120,408	$	13,949

Other expense, as previously reported (excluding amounts included in discontinued operations)	$	112,490	$	62,478
Revision of other expense	1,685		593
Other expense, reported herein	$	114,175	$	63,071

Schedule of Inventory, Current [Table Text Block]

The following table presents the Company's materials and supplies and commodities inventories as of December 31, 2013 and 2012:



	Year Ended December 31,
	2013			2012
	(in thousands)
Materials and supplies (a)	$	210,792		$	258,962
Commodities	13,429			5,446
Less: Noncurrent materials and supplies (b)	(4,096		)	(67,352		)
	$	220,125		$	197,056

____________________


(a)	As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.


(b)	Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

Other Property Plant and Equipment [Table Text Block]

At December 31, 2013 and 2012, respectively, the net carrying value of other property and equipment consisted of the following:



	Year Ended December 31,
	2013 (a)		2012 (a)
	(in thousands)
Proved and unproved sand properties (b)	$	451,384	$	457,033
Equipment and rigs (c)	313,165		385,887
Land and buildings	344,554		259,629
Transportation equipment	41,397		44,928
Furniture and fixtures	47,905		43,614
Leasehold improvements	25,748		26,603
	$	1,224,153	$	1,217,694

____________________


(a)	At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.


(b)	Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

(c)

Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

Schedule of Other Ownership Interests [Table Text Block]

The following table presents the Company's net income or loss attributable to common stockholders adjusted for changes in equity as a result of transactions that changed the Company's ownership interest in Pioneer Southwest:



	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Transfers from the noncontrolling interest in consolidated subsidiaries:
Increase in additional paid in capital from the sale of 1.8 million Pioneer Southwest common units during 2011, net of tax of $15.4 million	—			—			26,915
Increase in additional paid in capital from Pioneer Southwest's offering of 2.6 million common units during 2011, net of tax of $23.7 million	—			—			8,104
Decrease in additional paid in capital for deferred taxes recognized attributable to Pioneer Southwest's 2008 initial public offering of 9.5 million common units	—			(49,072		)	—
Increase in additional paid in capital from Pioneer Southwest merger	168,685			—			—
Increase in additional paid in capital from deferred taxes recognized attributable to Pioneer Southwest merger	200,091			—			—
Decrease in additional paid in capital from Pioneer Southwest merger transaction costs	(3,880		)	—			—
Net increase (decrease) in equity from transactions with noncontrolling interests	364,896			(49,072		)	35,019
Net income (loss) attributable to common stockholders and changes in equity from transactions with noncontrolling interests	$	(473,518	)	$	143,213		$	869,508

Gas Entitlement Assets and Liabilities [Table Text Block]

The following table presents the Company's gas entitlement assets and liabilities with their associated volumes as of December 31, 2013 and 2012. Gas volumes are presented in millions of cubic feet ("MMCF").



	December 31,
	2013			2012
	Amount		Volume	Amount		Volume
	(dollars in millions)
Gas entitlement assets	$	7.4	2,990	$	6.8	2,870
Gas entitlement liabilities	$	2.5	715	$	1.9	582