Quicksilver Resources (KWK) 10-Q 6 Nov 13 2013 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'QUICKSILVER RESOURCES INC	'
Entity Central Index Key	'0001060990	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	177,115,784

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Revenue	'		'		'		'
Production	$104,546		$156,288	[1]	$358,281		$473,053	[1]
Sales of purchased natural gas	15,130		21,313	[1]	50,373		42,841	[1]
Net derivative gains (losses) (including realized gains of $8,009 and $12,376; $14,129 and $35,059, respectively)	32,733		-60,377	[1]	36,202		-33,902	[1]
Other	707		964	[1]	2,462		3,080	[1]
Total revenue	153,116		118,188		447,318		485,072
Operating expense	'		'		'		'
Lease operating	18,591		22,115	[1]	63,699		72,405	[1]
Gathering, processing and transportation	35,567		41,338	[1]	112,064		127,039	[1]
Production and ad valorem taxes	4,678		6,881	[1]	15,462		20,833	[1]
Costs of purchased natural gas	15,114		21,254	[1]	50,311		42,528	[1]
Depletion, depreciation and accretion	14,390		34,014	[1]	47,911		136,469	[1]
Impairment	0		551,132	[1]	0		2,068,787	[1]
General and administrative	10,471		17,335	[1]	43,509		54,835	[1]
Other operating	2,230		670	[1]	4,435		821	[1]
Total expense	101,041		694,739		337,391		2,523,717
Crestwood earn-out	'		'		'		41,097
Operating income (loss)	60,049		-576,551		451,073		-1,997,548
Other income - net	667		-395	[1]	-14,588		-237	[1]
Fortune Creek accretion	-4,818		-4,978	[1]	-14,490		-14,549	[1]
Interest expense	-39,355		-42,102	[1]	-210,535		-122,348	[1]
Income (loss) before income taxes	16,543		-624,026		211,460		-2,134,682
Income tax (expense) benefit	-5,966		-166,494	[1]	-18,063		330,575	[1]
Net income (loss)	10,577		-790,520		193,397		-1,804,107
Net Income (Loss) Attributable to Parent	10,577		-790,520		193,397		-1,804,107
Reclassification adjustments related to settlements of derivative contracts into production revenue- net of income tax	-11,139		-34,145	[1]	-37,181		-99,726	[1]
Net change in derivative fair value - net of income tax	0		-11,905	[1]	0		60,305	[1]
Foreign currency translation adjustment	2,345		-565	[1]	-933		-5,495	[1]
Other comprehensive income (loss)	-8,794		-46,615		-38,114		-44,916
Comprehensive income (loss)	1,783		-837,135		155,283		-1,849,023
Earnings (loss) per common share - basic	$0.06		($4.65)	[1]	$1.10		($10.61)	[1]
Earnings (loss) per common share - diluted	$0.06	[2]	($4.65)	[1],[2]	$1.10	[2]	($10.61)	[1],[2]
Tokyo Gas [Member]	'		'		'		'
Operating expense	'		'		'		'
Crestwood earn-out	7,974		0	[1]	341,146		'
Gain (Loss) on Disposition of Oil and Gas and Timber Property	'		'		341,146		0	[1]
kwk_CrestwoodLP [Member]	'		'		'		'
Operating expense	'		'		'		'
Crestwood earn-out	$0		$0	[1]	$0		$41,097	[1]
[1]	Note 1 contains additional information
[2]	For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Current assets	'	'	'	'
Cash	$56,478	$4,951	$7,436	$13,146
Marketable Securities, Current	129,812	0	'	'
Cash, Cash Equivalents, and Short-term Investments	186,290	4,951	'	'
Accounts receivable - net of allowance for doubtful accounts	55,242	64,149	'	'
Derivative assets at fair value	86,003	113,367	'	'
Other current assets	22,413	25,046	'	'
Total current assets	349,948	207,513	'	'
Property, plant and equipment - net	'	'	'	'
Oil and gas properties, full cost method (including unevaluated costs of $291,147 and $307,267, respectively)	629,684	780,960	'	'
Property, Plant and Equipment, Other, Net	233,248	248,098	'	'
Property, plant and equipment, net of accumulated depletion and depreciation	862,932	1,029,058	'	'
Derivative assets at fair value	75,328	105,270	'	'
Other assets	43,405	39,947	'	'
Total assets	1,331,613	1,381,788	'	'
Current liabilities	'	'	'	'
Current portion of long-term debt	0	0	'	'
Accounts payable	12,745	37,131	'	'
Accrued liabilities	102,913	130,660	'	'
Total current liabilities	115,658	167,791	'	'
Long-term debt	1,926,167	2,063,206	'	'
Partnership liability	132,732	130,912	'	'
Asset retirement obligations	99,160	115,949	'	'
Derivative liabilities at fair value	3,172	17,485	'	'
Other liabilities	19,242	19,242	'	'
Commitments and contingencies (Note 8)	'	'	'	'
Stockholders' equity	'	'	'	'
Preferred stock, par value $0.01, 10,000,000 shares authorized, none outstanding	0	0	'	'
Common stock, $0.01 par value, 400,000,000 shares authorized, and 183,685,021 and 179,015,118 shares issued, respectively	1,837	1,790	'	'
Paid in capital in excess of par value	765,815	751,394	'	'
Treasury stock of 6,545,651 and 5,921,102 shares, respectively	-50,967	-49,495	'	'
Accumulated other comprehensive income	123,379	161,493	'	'
Retained deficit	-1,804,582	-1,997,979	'	'
Total stockholders' equity	-964,518	-1,132,797	'	'
Total liabilities and stockholders' equity	$1,331,613	$1,381,788	'	'

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value	$0.01	$0.01
Unevaluated costs of oil and gas properties	$291,147	$307,267
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	183,685,021	179,015,118
Treasury stock, shares	6,545,651	5,921,102

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Equity (USD $)	Total		Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
In Thousands
Balances at Dec. 31, 2011	$1,261,919		$1,770	$737,015	($46,351)	$214,858	$354,627
Net income (loss)	-1,804,107		'	'	'	'	-1,804,107
Hedge derivative contract settlements reclassified into earnings from AOCI, net of income tax	-99,726		'	'	'	-99,726	'
Net change in derivative fair value, net of income tax	60,305	[1]	'	'	'	60,305	'
Foreign currency translation adjustment	-5,495	[1]	'	'	'	-5,495	'
Issuance and vesting of stock compensation	15,262		17	18,055	-2,810	'	'
Stock option exercises	11		1	10	'	'	'
Balances at Sep. 30, 2012	-571,831		1,788	755,080	-49,161	169,942	-1,449,480
Balances at Dec. 31, 2012	-1,132,797		1,790	751,394	-49,495	161,493	-1,997,979
Net income (loss)	193,397		'	'	'	'	193,397
Hedge derivative contract settlements reclassified into earnings from AOCI, net of income tax	-37,181		'	'	'	-37,181	'
Net change in derivative fair value, net of income tax	0		'	'	'	'	'
Foreign currency translation adjustment	-933		'	'	'	-933	'
Issuance and vesting of stock compensation	12,996		47	14,421	-1,472	'	'
Balances at Sep. 30, 2013	($964,518)		$1,837	$765,815	($50,967)	$123,379	($1,804,582)
[1]	Note 1 contains additional information

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Equity (Parenthetical) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Statement of Stockholders' Equity [Abstract]	'	'
Income tax effect related to hedge derivative contract settlements reclassified into earnings from accumulated other comprehensive income	($17,833)	($51,909)
Income tax effect related to net change in derivative fair value	$0	$30,042

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'
Net income (loss)	$193,397	($1,804,107)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Depletion, depreciation and accretion	47,911	136,469	[1]
Impairment expense	0	2,068,787	[1]
Crestwood earn-out	'	-41,097
Deferred income tax expense (benefit)	17,833	-326,149
Non-cash (gain) loss from hedging and derivative activities	-12,223	88,913
Stock-based compensation	13,699	16,983
Non-cash interest expense	23,643	8,060
Fortune Creek accretion	14,490	14,549	[1]
Other	3,622	495
Changes in assets and liabilities	'	'
Accounts receivable	7,398	27,259
Prepaid expenses and other assets	344	-4,503
Accounts payable	-17,973	-24,329
Accrued and other liabilities	-32,098	-19,954
Net cash flow provided by (used in) by operating activities	-81,103	141,376
Investing activities:	'	'
Purchases of property, plant and equipment	-78,549	-437,172
Proceeds from Divestiture of Interest in Subs & Affiliates	'	41,097
Proceeds from sale of properties and equipment	2,994	3,843
Payments to acquire marketable securities	-142,823	0
Proceeds from Sale and Maturity of Held-to-maturity Securities	13,178	0
Net cash provided by (used in) investing activities	300,515	-392,232
Financing activities:	'	'
Issuance of debt	1,173,306	367,646
Repayments of debt	-1,308,382	-111,115
Debt issuance costs paid	-25,868	-3,048
Distribution of Fortune Creek Partnership funds	-8,079	-6,520
Proceeds from exercise of stock options	0	11
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	1,089
Purchase of treasury stock	-1,472	-2,810
Net cash provided by financing activities	-170,495	245,253
Effect of exchange rate changes in cash	2,610	-107
Net increase (decrease) in cash	51,527	-5,710
Cash at beginning of period	4,951	13,146
Cash at end of period	56,478	7,436
kwk_CrestwoodLP [Member]	'	'
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Crestwood earn-out	0	-41,097	[1]
Investing activities:	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	41,097
Tokyo Gas [Member]	'	'
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Gain (Loss) on Disposition of Oil and Gas and Timber Property	341,146	0	[1]
Crestwood earn-out	-341,146	'
Investing activities:	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	463,418	0
Synergy [Member]	'	'
Investing activities:	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	$42,297	$0
[1]	Note 1 contains additional information

Accounting_Policies_And_Disclo

Accounting Policies And Disclosures	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Accounting Policies And Disclosures	'
	ACCOUNTING POLICIES AND DISCLOSURES
	The accompanying condensed consolidated interim financial statements have not been audited. In management’s opinion, the accompanying condensed consolidated interim financial statements contain all adjustments necessary to fairly present our financial position as of September 30, 2013 and our results of operations and cash flows for the periods presented. All such adjustments are of a normal recurring nature unless otherwise noted. The results for interim periods are not necessarily indicative of annual results.
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of certain assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during each reporting period. We believe our estimates and assumptions are reasonable; however, such estimates and assumptions are subject to a number of risks and uncertainties, which may cause actual results to differ materially from management’s estimates.
	Certain disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these financial statements should be read in conjunction with our consolidated financial statements and notes thereto included in our 2012 Annual Report on Form 10-K.
	Restatement of Previously Issued Unaudited Financial Statements
	The consolidated financial statements as of and for the three and nine months ended September 30, 2012 were restated as more fully disclosed within Item 8, Note 2 and the Supplemental Selected Quarterly Financial Data in the 2012 Annual Report on Form 10-K. The restatement is the result of our hedge documentation failing to give consideration to all sources of ineffectiveness for derivatives entered into during 2012 that had fair value on the dates they were initially designated as hedges. These derivatives did not qualify for hedge accounting in 2012 and their changes in value required recognition in earnings. Because the derivatives did not qualify for hedge accounting, their inclusion in the U.S. and Canadian full cost ceiling was inappropriate. Also, we determined that the deferred taxes used in our Canadian ceiling test included temporary differences for non-property related items. Thus, we revised our full cost ceiling calculations, which resulted in restatements to increase impairment expense recognized. Income taxes have also been restated to reflect the foregoing restated items.
	For the three months ended September 30, 2012, the derivative restatement adjustment decreased production revenue by $0.3 million and $1.1 million for the U.S. and Canada, respectively, while derivative losses increased $42.8 million and $15.3 million for the U.S. and Canada, respectively. Impairment expense increased as the result of these derivatives no longer being included in the cost center ceiling by $43.4 million for the U.S. but decreased by $39.1 million for Canada, while depletion expense decreased $3.3 million and $5.9 million for the U.S. and Canada, respectively. The income tax impact of these adjustments resulted in an increase to the tax expense of $75.3 million and $8.8 million for the U.S. and Canada, respectively. Our consolidated net loss increased $138.8 million, which decreased our retained earnings by the same amount. Other comprehensive income and AOCI increased $34.7 million as a result of these adjustments. The restatement increased diluted net loss per share by $0.82, from diluted net loss per share of $3.83 as previously reported, to diluted net loss per share of $4.65.
	For the nine months ended September 30, 2012, the derivative restatement decreased production revenue by $2.6 million and $4.4 million for the U.S. and Canada, respectively, while derivative gains increased $0.1 million and $0.2 million for the U.S. and Canada, respectively. Impairment expense increased as the result of these derivatives no longer being included in the cost center ceiling by $303.1 million and $164.2 million for the U.S. and Canada, respectively, while depletion expense decreased $4.6 million and $8.5 million for the U.S. and Canada, respectively. The income tax impact of these adjustments resulted in an increase to the tax benefit of $0.9 million and $40.0 million for the U.S. and Canada, respectively. Our consolidated net loss increased $419.9 million, which decreased our retained earnings by the same amount. Other comprehensive income and AOCI decreased $5.2 million as a result of these adjustments. The restatement increased diluted net loss per share by $2.47, from diluted net loss per share of $8.14 as previously reported, to diluted net loss per share of $10.61.
	Recently Issued Accounting Standards
	Accounting standards-setting organizations frequently issue new or revised accounting rules. We regularly review all new pronouncements to determine their impact, if any, on our financial statements. No pronouncements materially affecting our financial statements have been issued since the filing of our 2012 Annual Report on Form 10-K.

Divestitures

Divestitures	9 Months Ended
	Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Divestitures	'
	DIVESTITURES
	In October and November 2013, we executed two separate agreements involving our West Texas Asset, the largest of which is a joint venture with Eni whereby we will jointly evaluate, explore and develop approximately 52,500 gross acres currently held by us in Pecos County, Texas. Under the terms of the agreement, Eni will pay up to $52.0 million in three phases to earn a 50% interest in our acreage. In the first phase, Eni will fund 100% of the drilling and completion costs of up to a three-well program. Upon funding of the first phase, Eni will earn 50% of our interest in a 7,500 gross acre tract in Pecos County. Eni will then have the option to fund 100% of the drilling and completion costs of another two wells, and will then have the option to fully fund a 3-D seismic survey of the remaining, undeveloped acreage. Upon completion of the three phases, we will participate equally in all future revenue, operating cost and capital expenditures.
	In August 2013, we completed the sale of our Southern Alberta Asset to Synergy with an effective date of January 1, 2013. The purchase price was $46.0 million, which was subject to customary purchase price adjustments, resulting in Synergy paying us $42.3 million. Under the full cost method of accounting, our U.S. exploration and production assets are considered a single asset. The Synergy Transaction did not represent a significant disposal of reserves, therefore our U.S. oil and gas properties were reduced by these proceeds and we did not recognize a gain.
	In March 2013, we entered into a Purchase and Sale Agreement with TGBR to sell an undivided 25% of our Barnett Shale Asset for a purchase price of $485 million. The transaction closed in April 2013, but was effective as of September 1, 2012. The purchase price was subject to customary purchase price adjustments, which resulted in TGBR paying us $464.0 million, including an estimated final payment of $0.6 million, which we expect to receive in the fourth quarter of 2013. We recognized a gain of $341.1 million before consideration of income taxes as a result of this transaction, including a revision of the gain calculation in the third quarter of 2013 of $7.8 million. The Tokyo Gas Transaction represented a significant disposal of reserves, which resulted in gain recognition for the transaction. Our U.S. oil and gas properties were reduced by $110.7 million as a result of the Tokyo Gas Transaction.
	In October 2010, we completed the sale of all of our interests in KGS to Crestwood. As part of the sale, we had the right to collect future earn-out payments through 2013. In February 2012, we collected $41 million of these earn-out payments which is presented as “Crestwood earn-out” in the condensed consolidated statement of income. We will not receive additional earn-out payments in 2013.
	Note 3 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contains additional information regarding the Crestwood Transaction.

Derivatives_And_Fair_Value_Mea

Derivatives And Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Credit Risk Derivatives, at Fair Value, Net [Abstract]	'
Derivatives And Fair Value Measurements	'
	DERIVATIVES, MARKETABLE SECURITIES AND FAIR VALUE MEASUREMENTS
	The following table categorizes our commodity derivative instruments based upon the use of input levels:
		Asset Derivatives							Liability Derivatives
		30-Sep-13				31-Dec-12			30-Sep-13			31-Dec-12
		(in thousands)							(in thousands)
	Level 2 inputs	$	146,864			$	207,042		$	(390	)	$	959
	Level 3 inputs	14,467				11,595			3,562			16,526
	Total	$	161,331			$	218,637		$	3,172		$	17,485
	The fair value of “Level 2” derivative instruments included in these disclosures was estimated using prices quoted in active markets for the periods covered by the derivatives and the value reported by counterparties. The fair value of derivative instruments designated as “Level 3” was estimated using prices quoted in markets where there is insufficient market activity for consideration as “Level 2” instruments. Currently, only our natural gas derivatives with an original tenure of 10 years utilize “Level 3” inputs, primarily due to comparatively less market data available for the later portion of their term compared with our other shorter term derivatives. The fair value of both the “Level 2” and the “Level 3” assets and liabilities are determined using a discounted cash flow model using the terms of the derivative instrument, market prices for the periods covered by the derivatives, and the credit adjusted risk-free interest rates. The “Level 3” unobservable inputs are the market prices for the estimated market values for the period from 2018 to 2021, as there is not an active market for that period of time. These unobservable inputs included within the fair value calculation range from $3.50 to $5.61 and are based upon prices quoted in active markets for the period of time available and applying the differential from this period of time to the market prices for the later years in the term.
	The following table identifies the changes in “Level 3” net asset derivative fair values for the periods indicated:
		For the Three Months Ended
		September 30,
		2013				2012
		(In thousands)
	Balance at beginning of period	$	(9,873	)		$	45,345
	Total gains (losses) for the period:
	Unrealized gain (loss) on derivatives	24,080				(51,685		)
	Settlements in production revenue	—				(825		)
	Settlements in net derivative gains (losses)	(3,302		)		(6,870		)
	Unrealized gains reported in OCI	—				409
	Balance at end of period	$	10,905			$	(13,626	)
	Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	24,026			$	(51,685	)
		For the Nine Months Ended
		September 30,
		2013				2012
		(In thousands)
	Balance at beginning of period	$	(4,931	)		$	150,989
	Total gains (losses) for the period:
	Unrealized gain (loss) on derivatives	24,618				(16,160		)
	Transfers out of Level 3	—				(153,418		)
	Settlements in production revenue	—				(5,600		)
	Settlements in net derivative gains (losses)	(8,782		)		(22,743		)
	Unrealized gains reported in OCI	—				33,306
	Balance at end of period	$	10,905			$	(13,626	)
	Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	26,788			$	(16,160	)
	In 2012, transfers from Level 3 to Level 2 represent our ten-year derivative instruments that were exchanged in January and February 2012 for derivative instruments with shorter durations and which were valued on the date of the transfer.
	Commodity Price Derivatives
	As of September 30, 2013, we had natural gas and NGL swaps as follows:
	Production		Daily Production
	Year		Volume
			Natural Gas		NGL
			MMcfd		MBbld
	Remainder of 2013		200		6
	2014 (1)		170		4
	2015		150		—
	2016-2021		40		—
	-1	Our 2014 NGL derivatives end in September. Our natural gas derivatives are in place until the end of the year.
	In October 2013, we entered into 40 MMcfd AECO to NYMEX natural gas basis swaps for the calendar year 2014.
	Effective December 31, 2012, we discontinued the use of hedge accounting. Changes in value subsequent to this date are recognized in net derivative gains (losses) in the period in which they occur. The net deferred hedge gain that was included in AOCI as of December 31, 2012 is being released into revenue from natural gas, NGL and oil production during the following periods in which we expect the underlying production to occur:
		(In thousands)
	Remainder of 2013	$	15,254
	2014	37,084
	2015	33,191
	2016	13,476
	2017	12,531
	2018 and thereafter	41,443
		$	152,979
	Gains and losses from the effective portion of derivative assets and liabilities held in AOCI expected to be reclassified into earnings during the following twelve months would result in a gain of $29.5 million net of income taxes.
	Interest Rate Derivatives
	In 2010, we executed early settlements of our interest rate swaps that were designated as fair value hedges of our senior notes due 2015 and our senior subordinated notes. We received cash of $41.5 million in the settlements, including $10.7 million for interest previously accrued and earned. Upon the early settlements, we recorded the resulting gain as a fair value adjustment to our debt and began to recognize the deferred gain of $30.8 million as a reduction of interest expense over the lives of our senior notes due 2015 and our senior subordinated notes.
	In June 2013, we repurchased substantially all our senior notes due 2015 resulting in early recognition of the previously deferred gain of $8.3 million. During the nine months ended September 30, 2013 and 2012, we recognized $11.5 million and $3.8 million, respectively, of those deferred gains as a reduction of interest expense. The remaining $5.3 million deferral of the 2010 early settlements from the senior subordinated notes interest rate swaps will continue to be recognized as a reduction of interest expense over the life of those instruments currently scheduled as follows:
		(In thousands)
	Remainder of 2013	$	492
2014	2,039
2015	2,194
2016	569
	$	5,294
Fair Value Disclosures
The estimated fair values of our derivative instruments at September 30, 2013 and December 31, 2012 were as follows:
	Asset Derivatives								Liability Derivatives
	30-Sep-13				31-Dec-12				30-Sep-13			31-Dec-12
	(In thousands)								(In thousands)
Derivatives not designated as hedges:
Commodity contracts reported in:
Current derivative assets	$	86,003			$	113,367			$	—		$	—
Noncurrent derivative assets	75,403				107,542				75			2,272
Current derivative liabilities	—				—				—			—
Noncurrent derivative liabilities	448				92				3,620			17,577
Total derivatives not designated as hedges	$	161,854			$	221,001			$	3,695		$	19,849
Derivative assets and liabilities shown in the table above are presented as gross assets and liabilities, without regard to master netting arrangements which are considered in the presentations of derivative assets and liabilities in the accompanying condensed consolidated balance sheets. The change in carrying value of our commodity price derivatives since December 31, 2012 principally resulted from the overall increase in market prices for natural gas relative to the prices in our open derivative instruments, offset by settlements during the period.
The changes in the carrying value of our derivatives accounted for as hedges for the three and nine months ended September 30, 2012 are presented below:
	For the Three Months Ended
	September 30,
	2012
	Commodity Hedges
	(In thousands)
Derivative fair value at beginning of period	$	176,726
Settlements in production revenue	(45,681		)
Ineffectiveness reported in net derivative gains	(547		)
Unrealized gains (losses) reported in OCI	(15,543		)
Derivative fair value at end of period	$	114,955
	For the Nine Months Ended
	September 30,
	2012
	Commodity Hedges
	(In thousands)
Derivative fair value at beginning of period	$	342,799
Settlements in production revenue	(137,417		)
Settlements in net derivative gains	(3,820		)
Ineffectiveness reported in net derivative gains	1,022
Unrealized gains reported in OCI	93,103
Derecognition of hedge	(180,732		)
Derivative fair value at end of period	$	114,955
Financial instruments not carried at fair value
Carrying values and fair values of financial instruments that are not carried at fair value in the consolidated balance sheet as of September 30, 2013 and December 31, 2012 are included in Note 5.
Investments
We hold certain short-term marketable securities related to interest bearing time deposits and commercial paper. These held-to-maturity marketable securities are included in Cash and Cash Equivalents if the maturities at the time we made the investment were three months or less. For maturities greater than three months but less than a year, the marketable securities are included in current Marketable Securities. At September 30, 2013, we had the following marketable securities:
	Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair Market Value
	(In thousands)
Marketable securities (held-to-maturity)
Time deposits	$	19,902			$	—		$	(22	)	$	19,880
Commercial paper	109,910				34			(31		)	109,913
Marketable securities	$	129,812			$	34		$	(53	)	$	129,793
We had no marketable securities at December 31, 2012.

Property_Plant_And_Equipment

Property, Plant And Equipment	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant And Equipment	'
	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment consisted of the following:
		30-Sep-13			31-Dec-12
		(In thousands)
	Oil and gas properties
	Subject to depletion	$	5,630,152		$	5,770,913
	Unevaluated costs	291,147			307,267
	Accumulated depletion	(5,291,615		)	(5,297,220		)
	Net oil and gas properties	629,684			780,960
	Other plant and equipment
	Pipelines and processing facilities	358,186			375,248
	General properties	79,619			75,147
	Accumulated depreciation	(204,557		)	(202,297		)
	Net other property and equipment	233,248			248,098
	Property, plant and equipment, net of accumulated depletion and depreciation	$	862,932		$	1,029,058
	Ceiling Test Analysis and Impairment
	We recorded impairment expense of $479.9 million and $66.3 million for the three months ended September 30, 2012, $1,042.7 million and $157.0 million for the three months ended June 30, 2012 and $178.0 million and $139.9 million for the three months ended March 31, 2012 for our U.S. and Canadian oil and gas properties, respectively. We also recorded impairment expense of $4.9 million for the three months ended September 30, 2012 for other property and equipment.
	Notes 2 and 8 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contain additional information regarding our property, plant and equipment and our quarterly ceiling test analysis.

LongTerm_Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2013
Long-term Debt, Other Disclosures [Abstract]	'
Long-Term Debt	'
	LONG-TERM DEBT
	Long-term debt consisted of the following:
		30-Sep-13			31-Dec-12
		(in thousands)
	Combined Credit Agreements	$	149,736		$	388,150
	Senior Secured Second Lien Credit Agreement, net of unamortized discount	606,593			—
	Senior Secured Second Lien Notes due 2019, net of unamortized discount	194,110			—
	Senior notes due 2015, net of unamortized discount	10,466			435,851
	Senior notes due 2016, net of unamortized discount	8,032			579,795
	Senior notes due 2019, net of unamortized discount	293,083			292,622
	Senior notes due 2021, net of unamortized discount	308,853			—
	Senior subordinated notes due 2016	350,000			350,000
	Total debt	1,920,873			2,046,418
	Unamortized deferred gain-terminated interest rate swaps	5,294			16,788
	Current portion of long-term debt	—			—
	Long-term debt	$	1,926,167		$	2,063,206
	Combined Credit Facilities
	The Combined Credit Agreements’ global borrowing base was $350 million and the global letter of credit capacity was $280 million as of September 30, 2013. At September 30, 2013, we had $157.8 million available under the Combined Credit Agreements.
	We amended our Combined Credit Agreements in April and June 2013 for the following:
	•	Reduce the global borrowing base to $350 million from $850 million, including the reduction due to the Tokyo Gas Transaction
	•	Reduce the minimum required interest coverage ratio to the following:
	Period		Interest Coverage Ratio	Period		Interest Coverage Ratio
	Q3 2013		1.25	Q1 2015		1.1
	Q4 2013		1.25	Q2 2015		1.15
	Q1 2014		1.2	Q3 2015		1.15
	Q2 2014		1.15	Q4 2015		1.2
	Q3 2014		1.1	Q1 2016		1.5
	Q4 2014		1.1	Q2 2016		2
	•	Permit up to $825 million of second lien debt, subject to customary intercreditor terms
	•	Permit redemption of junior debt with the proceeds from certain asset sales and permitted second lien debt, provided utilization under the global borrowing base after giving effect to such redemption is less than 75% and compliance with other customary conditions
	•	Reduce the maximum senior secured debt leverage ratio to 2.0 and exclude permitted second lien debt from the senior secured debt definition
	•	Increase the applicable margin by 0.75% for each type of loan and issued letters of credit
	•	Increase the minimum mortgage properties requirement to 87.5% from 80% of proved hydrocarbon interests evaluated in the then most recent reserve report
	•	Amend certain definitions which impact the financial covenant calculations.
	Debt Refinancing
	During the quarter ended June 30, 2013, we executed multiple debt transactions, including payment of $51.4 million of cancellation premiums and discounts and tender premiums, which are more fully described below, to extend our debt maturities and reduce the weighted average interest costs. Deferred issuance costs related to the new debt were $23.4 million, and $4.1 million of incurred costs related to the repurchased debt were recognized as interest expense. Proceeds from the Senior Secured Second Lien Credit Agreement and the issuance of Senior Secured Second Lien Notes due 2019 and Senior Notes due 2021 were used to pay for validly tendered Senior Notes due 2015 and Senior Notes due 2016 and accrued interest thereon and transaction expenses.
	Senior Secured Second Lien Credit Agreement
	On June 21, 2013, we entered into a $625 million six-year Senior Secured Second Lien Credit Agreement. The loans thereunder were made at 97% of par, which resulted in net proceeds of $606.3 million. The Senior Secured Second Lien Credit Agreement has a margin of 5.75% plus the adjusted LIBOR (as defined in the Senior Secured Second Lien Credit Agreement, which is subject to a floor of 1.25%) or 4.75% plus the Alternate Base Rate (as defined in the Senior Secured Second Lien Credit Agreement, which is subject to a floor of 2.25%).
	Senior Secured Second Lien Notes due 2019
	On June 21, 2013, we issued $200 million of Senior Secured Second Lien Notes due 2019. The notes were issued at 97% of par, which resulted in net proceeds of $194 million. The Senior Secured Second Lien Notes have a margin of 5.75% plus LIBOR (as defined in the indenture governing the Senior Secured Second Lien Notes due 2019, which is subject to a floor of 1.25%). Interest is payable on the last day of each quarter.
	Senior Notes due 2021
	On June 21, 2013, we issued $325 million of Senior Notes due 2021, which are unsecured, senior obligations. The notes were issued at 94.928% of par, which resulted in proceeds of $308.5 million. Interest at the rate of 11.00% is payable semiannually on January 1 and July 1.
	Senior Notes due 2015
	During the quarter ended June 30, 2013, we announced a cash tender offer and consent solicitation for the Senior Notes due 2015 at a price of $1,027.90 plus interest of $32.08 per $1,000 outstanding. On June 21, 2013, we accepted and paid for all validly tendered notes, representing $425.2 million of the then outstanding $438.0 million, which resulted in an aggregate payment of $450.7 million for such repurchase. We also entered into a supplemental indenture to eliminate substantially all of the restrictive covenants and certain events of default with respect to such notes.
	During the quarter ended September 30, 2013, we repurchased $2.3 million aggregate principal amount of the Senior Notes due 2015.
	Senior Notes Due 2016
	During the quarter ended June 30, 2013, we announced a cash tender offer and consent solicitation for the Senior Notes due 2016 at a price of $1,068 plus interest of $55.49 per $1,000 outstanding. On June 21, 2013, we accepted and paid for all validly tendered notes, representing $582.5 million of the then outstanding $590.6 million, which resulted in an aggregate payment of $654.4 million for such repurchase. We also entered into a supplemental indenture to eliminate substantially all of the restrictive covenants and certain events of default with respect to such notes.
	Senior Notes Due 2019
	During the quarter ended June 30, 2013, we announced a consent solicitation for the Senior Notes due 2019. On June 21, 2013, we entered into supplemental indentures to permit the refinancing of the Senior Subordinated Notes due 2016 by incurring indebtedness that ranks equally in right of payment with the Senior Notes due 2019 provided such indebtedness has maturities longer than the Senior Notes due 2019, which resulted in the payment of an $11.5 million consent fee to the consenting holders of the Senior Notes due 2019.
	Indenture Restrictions
	We have an incurrence test under our indentures applicable to debt, restricted payments, mergers and consolidations and designation of unrestricted subsidiaries that requires EBITDA to exceed interest expense by 2.25 times. At September 30, 2013, we did not meet this test and, as a result, we are limited in our ability to, among other things, incur additional debt, except for specific baskets. We do retain, however, the ability to utilize the full borrowing capacity under our Combined Credit Agreements and to refinance existing debt. Not meeting this ratio does not represent an event of default under our indentures. We are presently unable to predict when or if we will meet the incurrence test.
	We retained a portion of the cash received from our asset sales. Our indentures require us to reinvest or repay debt with net cash proceeds from asset sales within one year.
	Summary of All Outstanding Debt
	The following table summarizes certain significant aspects of our long-term debt outstanding at September 30, 2013.
			Priority on Collateral and Structural Seniority (1)
			Highest								Lowest
			priority								priority
			First Lien	Second Lien			Senior Unsecured				Senior Subordinated
			Combined Credit	Senior Secured Second Lien Credit Agreement		Senior Secured Second Lien Notes due 2019	2015	2016	2019	2021	Senior
			Agreements				Senior Notes	Senior Notes	Senior Notes	Senior Notes	Subordinated Notes
	Principal amount (2)		$350 million	$625 million		$200 million	$11 million	$8 million	$298 million	$325 million	$350 million
	Scheduled maturity date (3)		September 6, 2016	June 21, 2019		June 21, 2019	August 1, 2015	January 1, 2016	August 15, 2019	July 1, 2021	April 1, 2016
	Interest rate on outstanding borrowings at September 30, 2013 (4)		4.00%	7.00%		7.00%	8.25%	11.75%	9.13%	11.00%	7.12%
Base interest rate options (5) (6)		LIBOR, ABR, CDOR	LIBOR floor of 1.25%; ABR floor of 2.25%		LIBOR floor of 1.25%	N/A	N/A	N/A	N/A	N/A
Financial covenants (7)		- Minimum current ratio of 1.0	N/A		N/A	N/A	N/A	N/A	N/A	N/A
		- Minimum EBITDA to cash interest expense ratio of 1.25
		- Maximum senior secured debt leverage ratio of 2.0
Significant restrictive covenants (7)		- Incurrence of debt	- Incurrence of debt		- Incurrence of debt	- Asset sales	- Asset sales	- Incurrence of debt	- Incurrence of debt	- Incurrence of debt
		- Incurrence of liens	- Incurrence of liens and 1st lien cap		- Incurrence of liens and 1st lien cap			- Incurrence of liens	- Incurrence of liens	- Incurrence of liens
		- Payment of dividends	-Payment of dividends		-Payment of dividends			-Payment of dividends	-Payment of dividends	-Payment of dividends
		- Equity purchases	- Equity purchases		- Equity purchases			- Equity purchases	- Equity purchases	- Equity purchases
		- Asset sales	- Asset sales		- Asset sales			- Asset sales	- Asset sales	- Asset sales
		- Affiliate transactions	- Affiliate transactions		- Affiliate transactions			- Affiliate transactions	- Affiliate transactions	- Affiliate transactions
		- Limitations on derivatives and investments
Optional redemption (7)		Any time	Any time,		Any time,	August 1,	July 1,	August 15,	July 1,	April 1,
			subject to		subject to	2013: 101.938	2013: 105.875	2014: 104.563	2019: 102.000	2013: 101.188
			re-pricing event		re-pricing event	2014: par	2014: 102.938	2015: 103.042	2020: par	2014: par
			June 21,		June 21,		2015: par	2016: 101.521
			2014: 102		2014: 102			2017: par
			2015: 101		2015: 101
Make-whole redemption (7)		N/A	N/A		N/A	N/A	N/A	Callable prior to	Callable prior to	N/A
								August 15, 2014 at	July 1, 2019 at
								make-whole call price of	make-whole call price of
								Treasury +50 bps	Treasury +50 bps
Change of control (7)		Event of default	Put at 101% of		Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of
			principal plus		principal plus	principal plus	principal plus	principal plus	principal plus	principal plus
			accrued interest		accrued interest	accrued interest	accrued interest	accrued interest	accrued interest	accrued interest
Equity clawback (7)		N/A	N/A		N/A	N/A	N/A	N/A	Redeemable until	N/A
									1-Jul-16
									at 111.00%, plus accrued
									interest for up to 35%
Estimated fair value (8)		$149.7 million	$600 million		$192 million	$10.1 million	$8.3 million	$271.6 million	$307.1 million	$332.9 million
(1)	Borrowings under the Amended and Restated U.S. Credit Facility, Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are guaranteed by certain of Quicksilver’s domestic subsidiaries and are secured (on a first priority basis with respect to the Amended and Restated U.S. Credit Facility and on a second priority basis with respect to the Senior Secured Second Lien Credit Agreement and the Senior Secured Second Lien Notes due 2019) by 100% of the equity interests of each of Cowtown Pipeline Management, Inc., Cowtown Pipeline Funding, Inc., Cowtown Gas Processing L.P., Cowtown Pipeline L.P., Barnett Shale Operating LLC, Silver Stream Pipeline Company LLC, QPP Parent LLC and QPP Holdings LLC (collectively, the “Domestic Pledged Equity”), 65% of the equity interests of Quicksilver Resources Canada Inc. (“Quicksilver Canada”) and Quicksilver Production Partners Operating Ltd. (with respect to the Amended and Restated U.S. Credit Facility, on a ratable basis with borrowings under the Amended and Restated Canadian Credit Facility) and the majority of Quicksilver's domestic proved oil and gas properties and related assets, (the “Domestic Pledged Property”). Borrowings under the Amended and Restated Canadian Credit Facility are guaranteed by Quicksilver and certain of its domestic subsidiaries and are secured by the Domestic Pledged Equity, the Domestic Pledged Property, 100% of the equity interests of Quicksilver Canada (65% of which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and any Canadian restricted subsidiaries, under the Amended and Restated Canadian Credit Facility, and 65% of the equity interests of Quicksilver Production Partners Operating Ltd. (which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and the majority of Quicksilver Canada's oil and gas properties and related assets. The other debt presented is based upon structural seniority and priority of payment.
(2)	The principal amount for the Combined Credit Agreements represents the global borrowing base as of September 30, 2013.
(3)	The Combined Credit Agreements are required to be repaid 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes, the 2016 Senior Subordinated Notes, the Senior Secured Second Lien Credit Agreement or the Senior Secured Second Lien Notes due 2019, if on the applicable date any amount of such debt remains outstanding. The Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are required to be repaid (1) 91 days prior to the maturity of the 2019 Senior Notes if more than $100 million of the 2019 Senior Notes remain outstanding and (2) 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes or the 2016 Senior Subordinated Notes if on the applicable date the aggregate amount of all such notes remaining outstanding is greater than $100 million.
(4)	Represents the weighted average borrowing rate payable to lenders.
(5)	Amounts outstanding under the Amended and Restated U.S. Credit Facility bear interest, at our election, at (i) adjusted LIBOR (as defined in the Amended and Restated U.S. Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii) ABR (as defined in the Amended and Restated U.S. Credit Facility), which is the greatest of (a) the prime rate announced by JPMorgan, (b) the federal funds rate plus 0.50% and (c) adjusted LIBOR for an interest period of one month plus 1.00%, plus, in each case under scenario (ii), an applicable margin between 1.75% and 2.75%. We also pay a per annum fee on the LC Exposure (as defined in the Amended and Restated U.S. Credit Facility) of all letters of credit issued under the Amended and Restated U.S. Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated U.S. Credit Facility of 0.50%.
(6)	Amounts outstanding under the Amended and Restated Canadian Credit Facility bear interest, at our election, at (i) the CDOR Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii) the Canadian Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75%, (iii) the U.S. Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75% and (iv) adjusted LIBOR (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%. We pay a per annum fee on the LC Exposure (as defined in the Amended and Restated Canadian Credit Facility) of all letters of credit issued under the Amended and Restated Canadian Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated Canadian Credit Facility of 0.50%.
(7)	The information presented in this table is qualified in all respects by reference to the full text of the covenants, provisions and related definitions contained in the documents governing the various components of our debt.
(8)	The estimated fair value is determined using market quotations based on recent trade activity for fixed rate obligations (“Level 2” inputs). Our Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 feature variable interest rates and we estimate their fair value by using market quotations based on recent trade activity (“Level 3” input). We consider our Combined Credit Agreements which have a variable interest rate to have a fair value equal to their carrying value (“Level 1” input).

Asset_Retirement_Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2013
Asset Retirement Obligation [Abstract]	'
Asset Retirement Obligations	'
	ASSET RETIREMENT OBLIGATIONS
	The following table provides a reconciliation of the changes in the estimated asset retirement obligation for the nine months ended September 30, 2013.
		(In thousands)
	Beginning asset retirement obligations	$	116,526
	Additional liability incurred	3,193
	Change in estimates	586
	Accretion expense	3,917
	Asset retirement costs incurred	(1,539		)
	Settlement of liability in excess of obligation recorded	867
	Disposition	(21,910		)
	Currency translation adjustment	(1,903		)
	Ending asset retirement obligations	99,737
	Less current portion	(577		)
	Long-term asset retirement obligation	$	99,160

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	Deferred income taxes are established for all temporary differences between the book and the tax basis of assets and liabilities. In addition, deferred tax balances must be adjusted to reflect tax rates that we expect will be in effect during years in which we expect the temporary differences will reverse. Net operating loss carry-forwards and other deferred tax assets are reviewed for recoverability, and if necessary, are recorded net of a valuation allowance. At September 30, 2013, our U.S. and Canadian valuation allowances are $445.9 million and $64.4 million, respectively, which reduce our net deferred tax assets to a zero value as we continue to believe that it is not more likely than not that we will realize the deferred tax benefits primarily related to our cumulative net operating losses. Income tax recognized for the three and nine months ended September 30, 2013 is a result of hedge gains previously deferred in AOCI being realized during the periods and the net tax impact being recognized.

Commitments_And_Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2013
Loss Contingency [Abstract]	'
Commitments And Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Contractual Obligations, Commitments and Contingencies
	In August 2013, we subleased a portion of our corporate offices. The sublease will reduce our future office space commitment by $2.2 million over the term of the lease.
	In July 2013, in light of the Canadian Governor in Council's failure to approve NGTL's construction of the Komie North Project, NGTL terminated the Project and Expenditure Authorization (PEA), which authorized NGTL to construct the Komie North Project and the related meter station. The PEA necessitated the construction of a treatment facility and required financial guarantees to cover NGTL's costs for the Komie North Project. We recognized $12.8 million in related actual costs incurred by NGTL, which is reflected in other income (expense) in our consolidated financial statements. We paid NGTL in August 2013 after which the related letter of credit was terminated. With the termination of the PEA described above, our agreement to deliver gas to the Komie North Project has also terminated. We maintain our ability to sell gas at the Station 2 and AECO hubs, as our current production is served by existing treating facilities and pipelines.
	In April 2013, we increased our outstanding letter of credit by C$13 million for the step-up of treating commitments in the Horn River Basin. In August 2013, we reduced our outstanding letters of credit by C$14 million upon a payment to NGTL related to the Komie North Project.
	In December 2012, Vantage Fort Worth Energy LLC (“Plaintiff”) served a lawsuit against us and others in the 352nd Judicial District Court of Texas in Tarrant County asserting claims for trespass to try title, suit to quiet title, trespass and conversion in connection with 16 wells located on a 158.75 acre tract located in Tarrant County, Texas. On May 8, 2013, all parties to the suit entered into a settlement agreement, effective April 1, 2013, whereby we assigned to Plaintiff various property and equipment and Plaintiff agreed to non-suit all of the Defendants in the matter. The court entered its Order of Dismissal with prejudice on May 13, 2013. We recognized an expense of $0.4 million in connection with this settlement.
	In July 2011, we received a subpoena duces tecum from the SEC requesting certain documents. The SEC has informed us that their investigation arises out of press releases in 2011 questioning the projected decline curves and economics of shale gas wells. In June 2012, we received an additional request from the SEC for certain information regarding our assessment for impairment of unevaluated properties and plans for development of unevaluated properties. We provided responsive information and in February 2013 we met with the SEC.
	Note 14 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contains a more complete description of our contractual obligations, commitments and contingencies for which there are no other significant updates during the quarter ended September 30, 2013.

Fortune_Creek

Fortune Creek	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Fortune Creek	'
	FORTUNE CREEK
	Note 16 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contains additional information on Fortune Creek. We committed to minimum gross capital expenditures of $300 million for drilling and completion activities in our Horn River Asset between 2012 and 2014, of which we have achieved $170.9 million as of September 30, 2013, and pursuant to the partnership agreement will be required to achieve an additional $9.1 million by December 31, 2013, with the balance to be achieved through December 31, 2014; provided further that up to $20 million could be deferred until December 31, 2015. These minimum expenditure commitments include gross capital expenditures for wells in which we have a working interest regardless of our working interest percentage. To the extent these minimum capital expenditure commitments are not met, we will incur a penalty in an amount equal to the shortfall, which will be applied against the gathering agreement requirement. Additionally, we committed gas production from our Horn River Asset for ten years beginning 2012, as more fully described below. KKR contributed $125 million cash in exchange for a 50% interest in Fortune Creek. Our Canadian subsidiary has responsibility for the day-to-day operations of Fortune Creek.
	Our Canadian subsidiary entered into a firm gathering agreement with Fortune Creek, which is guaranteed by us. At our election and based on the satisfaction of certain conditions, KKR has the responsibility to fund up to C$130 million of the capital required for construction of a new gas treatment facility in exchange for preferential cash flow distributions. If our subsidiary does not meet its obligations under the gathering agreement, KKR has the right to liquidate the partnership and consequently we have recorded the funds contributed by KKR as a liability in our consolidated financial statements. We recognize accretion expense to reflect the rate of return earned by KKR via its investment. Fortune Creek has made cash distributions to KKR, which are reported as cash used by financing activities, since May 2012.

Quicksilver_Stockholders_Equit

Quicksilver Stockholders' Equity	9 Months Ended
	Sep. 30, 2013
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]	'
Quicksilver Stockholders' Equity	'
	QUICKSILVER STOCKHOLDERS’ EQUITY
	Common Stock, Preferred Stock and Treasury Stock
	We are authorized to issue 400 million shares of common stock with a $0.01 par value per share and 10 million shares of preferred stock with a $0.01 par value per share. At September 30, 2013 and December 31, 2012, we had 177.1 million and 173.1 million shares of common stock outstanding, respectively.
	On May 15, 2013, our stockholders approved an amendment to the 2006 Equity Plan, which increased the shares available for issuance under the plan by 12 million shares. Note 17 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contains additional information about our equity-based compensation plan.
	Stock Options
	Options to purchase shares of common stock were granted in 2013 with an estimated fair value of $1.6 million. The following summarizes the values from and assumptions for the Black-Scholes option pricing model for stock options issued during the nine months ended September 30:
		2013		2012
	Weighted avg grant date fair value	$1.05		$4.21
	Weighted avg risk-free interest rate	1.31%		1.14%
	Expected life	4.9 years		6.0 years
	Wtd avg volatility	69.00%		68.20%
	Expected dividends	—		—
	The following table summarizes our stock option activity for the nine months ended September 30, 2013:
		Shares			Wtd Avg		Wtd Avg		Aggregate
					Exercise		Remaining		Intrinsic Value
					Price		Contractual Life
							(In years)		(In thousands)
	Outstanding at January 1, 2013	4,979,980			$	10.23
	Granted	2,037,467			1.95
	Expired	(151,867	)		7.76
	Outstanding at September 30, 2013	6,865,580			$	7.83	7.1		$	—
	Exercisable at September 30, 2013	4,670,679			$	9.28	6.2		$	—
	As of September 30, 2013, we estimate that a total of 6.4 million stock options will become vested including those options already exercisable. As of September 30, 2013, the unrecognized compensation cost related to outstanding unvested stock options was $2.7 million, which is expected to be recognized in expense through June 2015. Compensation expense related to stock options of $3.2 million and $5.9 million was recognized for each of the nine months ended September 30, 2013 and 2012, respectively.
	Restricted Stock
	The following table summarizes our restricted stock and stock unit activity for the nine months ended September 30, 2013:
		Payable in shares					Payable in cash
		Shares			Wtd Avg		Shares			Wtd Avg
					Grant Date					Grant Date
					Fair Value					Fair Value
	Outstanding at January 1, 2013	3,099,135			$	8.48	678,217			$	7.71
	Granted	6,102,133			2.74		1,468,695			2.83
	Vested	(2,018,457	)		7.57		(284,406	)		8.51
	Forfeited	(1,303,113	)		3.63		(298,138	)		3.88
	Outstanding at September 30, 2013	5,879,698			$	3.91	1,564,368			$	3.72
	As of September 30, 2013, the unrecognized compensation cost related to outstanding unvested restricted stock was $15.6 million, which is expected to be recognized in expense through March 2016. Grants of restricted stock and RSUs during the nine months ended September 30, 2013 had an estimated grant date fair value of $20.9 million. The fair value of outstanding RSUs to be settled in cash is $3.1 million at September 30, 2013. For the nine months ended September 30, 2013 and 2012, compensation expense related to restricted stock and RSUs of $12.2 million and $11.9 million, respectively, was recognized. The total fair value of shares vested during the nine months ended September 30, 2013 was $5.6 million.
	In the second quarter of 2013, the Company recognized $3.6 million in stock-based compensation to correct for assumptions on forfeitures and vesting for retirement eligible and imminently retirement eligible individuals, including $2.2 million which pertains to periods before 2013.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	EARNINGS PER SHARE
	The following is a reconciliation of the numerator and denominator used for the computation of basic and diluted net income (loss) per common share.
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
					(Restated)						(Restated)
		(In thousands, except per share data)
	Net income (loss) attributable to Quicksilver	$	10,577		$	(790,520	)	$	193,397		$	(1,804,107	)
	Basic income allocable to participating securities (1)	(312		)	—			$	(5,111	)	$	—
	Income (loss) available to shareholders	$	10,265		$	(790,520	)	$	188,286		$	(1,804,107	)
	Weighted average common shares – basic	171,682			170,179			171,403			170,054
	Effect of dilutive securities (2)
	Share-based compensation awards	311			—			170			—
	Weighted average common shares – diluted	171,993			170,179			171,573			170,054
	Earnings (loss) per common share – basic	$	0.06		$	(4.65	)	$	1.1		$	(10.61	)
	Earnings (loss) per common share – diluted	$	0.06		$	(4.65	)	$	1.1		$	(10.61	)
	(1)	Restricted share awards that contain nonforfeitable rights to dividends are participating securities and, therefore, should be included in computing earnings using the two-class method. Participating securities, however, do not participate in undistributed net losses because there is no contractual obligation to do so.
	(2)	For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2013
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Financial Information	'
	CONDENSED CONSOLIDATING FINANCIAL INFORMATION
	Note 19 to the consolidated financial statements in our 2012 Annual Report on Form 10-K contains a more complete description of our guarantor, non-guarantor, restricted and unrestricted subsidiaries under the indentures for our senior notes and senior subordinated notes.
	The following tables present financial information about Quicksilver and our restricted subsidiaries for the nine-month period covered by the consolidated financial statements. Under the indentures for our senior notes and senior subordinated notes, Fortune Creek is not considered to be a subsidiary and therefore it is presented separately from the other subsidiaries for these purposes.
	Condensed Consolidating Balance Sheets
		30-Sep-13
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
		(In thousands)
	ASSETS
	Current assets	$	315,788		$	10,016		$	61,101		$	(35,986	)	$	350,919		$	2,443		$	1,428		$	(4,842	)	$	349,948
	Property and equipment	457,139			15,757			304,754			—			777,650			—			85,282			—			862,932
	Investment in subsidiaries (equity method)	(211,041		)	—			(33,931		)	211,041			(33,931		)	(33,931		)	—			67,862			—
	Other assets	476,322			—			33,134			(390,723		)	118,733			—			—			—			118,733
	Total assets	$	1,038,208		$	25,773		$	365,058		$	(215,668	)	$	1,213,371		$	(31,488	)	$	86,710		$	63,020		$	1,331,613
	LIABILITIES AND EQUITY
	Current liabilities	$	107,325		$	11,802		$	35,835		$	(35,986	)	$	118,976		$	2,423		$	(899	)	$	(4,842	)	$	115,658
	Long-term liabilities	1,895,402			19,242			522,245			(390,723		)	2,046,166			—			1,575			132,732			2,180,473
	Stockholders' equity	(964,519		)	(5,271		)	(193,022		)	211,041			(951,771		)	(33,911		)	86,034			(64,870		)	(964,518		)
	Total liabilities and equity	$	1,038,208		$	25,773		$	365,058		$	(215,668	)	$	1,213,371		$	(31,488	)	$	86,710		$	63,020		$	1,331,613
		December 31, 2012
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources
		Inc.			Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Inc.
								Subsidiaries						Subsidiaries			Subsidiaries									Consolidated
		(In thousands)
	ASSETS
	Current assets	$	261,130		$	105,695		$	76,088		$	(222,586	)	$	220,327		$	13,250		$	391		$	(26,455	)	$	207,513
	Property and equipment	621,073			20,007			296,462			—			937,542			—			91,516			—			1,029,058
	Investment in subsidiaries	(191,725		)	—			(42,883		)	191,725			(42,883		)	(42,905		)	—			85,788			—
	(equity method)
	Other assets	346,972			—			41,865			(243,620		)	145,217			—			—			—			145,217
	Total assets	$	1,037,450		$	125,702		$	371,532		$	(274,481	)	$	1,260,203		$	(29,655	)	$	91,907		$	59,333		$	1,381,788
	LIABILITIES AND EQUITY
	Current liabilities	$	255,678		$	112,133		$	33,475		$	(222,586	)	$	178,700		$	13,230		$	2,316		$	(26,455	)	$	167,791
	Long-term liabilities	1,914,568			19,242			524,107			(243,620		)	2,214,297			—			1,585			130,912			2,346,794
	Stockholders' equity	(1,132,796		)	(5,673		)	(186,050		)	191,725			(1,132,794		)	(42,885		)	88,006			(45,124		)	(1,132,797		)
	Total liabilities and equity	$	1,037,450		$	125,702		$	371,532		$	(274,481	)	$	1,260,203		$	(29,655	)	$	91,907		$	59,333		$	1,381,788
	Condensed Consolidating Statements of Income
		For the Three Months Ended September 30, 2013
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
		(In thousands)
	Revenue	$	114,021		$	192		$	38,903		$	—		$	153,116		$	—		$	5,674		$	(5,674	)	$	153,116
	Operating expenses	73,594			68			30,360			—			104,022			—			2,693			(5,674		)	101,041
	Tokyo Gas Transaction gain	7,974			—			—			—			7,974			—			—			—			7,974
	Equity in net earnings of subsidiaries	3,854			—			(1,834		)	(3,854		)	(1,834		)	2,984			—			(1,150		)	—
	Operating income (loss)	52,255			124			6,709			(3,854		)	55,234			2,984			2,981			(1,150		)	60,049
	Fortune Creek accretion	—			—			—			—			—			—			—			(4,818		)	(4,818		)
	Interest expense and other	(36,922		)	—			(1,769		)	—			(38,691		)	—			3			—			(38,688		)
	Income tax (expense) benefit	(4,756		)	—			(1,210		)	—			(5,966		)	—			—			—			(5,966		)
	Net income (loss)	$	10,577		$	124		$	3,730		$	(3,854	)	$	10,577		$	2,984		$	2,984		$	(5,968	)	$	10,577
	Other comprehensive income (loss)	(6,114		)	—			(2,680		)	—			(8,794		)	—			—			—			(8,794		)
	Equity in OCI of subsidiaries	(2,680		)	—			—			2,680			—			—			—			—			—
	Comprehensive income (loss)	$	1,783		$	124		$	1,050		$	(1,174	)	$	1,783		$	2,984		$	2,984		$	(5,968	)	$	1,783
		For the Three Months Ended September 30, 2012 (Restated)
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
	(In thousands)
Revenue	$	108,366		$	1,182		$	9,336		$	(696	)	$	118,188		$	—		$	4,422		$	(4,422	)	$	118,188
Operating expenses	600,696			739			95,412			(696		)	696,151			—			3,010			(4,422		)	694,739
Equity in net earnings of subsidiaries	(71,911		)	—			(2,269		)	71,911			(2,269		)	1,443			—			826			—
Operating income (loss)	(564,241		)	443			(88,345		)	71,911			(580,232		)	1,443			1,412			826			(576,551		)
Fortune Creek accretion	—			—			—			—			—			—			—			(4,978		)	(4,978		)
Interest expense and other	(37,964		)	—			(4,586		)	—			(42,550		)	22			31			—			(42,497		)
Income tax (expense) benefit	(188,457		)	142			20,577			—			(167,738		)	—			—			1,244			(166,494		)
Net income	$	(790,662	)	$	585		$	(72,354	)	$	71,911		$	(790,520	)	$	1,465		$	1,443		$	(2,908	)	$	(790,520	)
Other comprehensive income (loss)	(40,955		)	—			(5,660		)	—			(46,615		)	—			—			—			(46,615		)
Equity in OCI of subsidiaries	(5,660		)	—			—			5,660			—			—			—			—			—
Comprehensive income (loss)	$	(837,277	)	$	585		$	(78,014	)	$	77,571		$	(837,135	)	$	1,465		$	1,443		$	(2,908	)	$	(837,135	)
	For the Nine Months Ended September 30, 2013
	Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
	Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
				Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
							Subsidiaries						Subsidiaries			Subsidiaries
	(In thousands)
Revenue	$	334,848		$	608		$	111,862		$	—		$	447,318		$	—		$	16,736		$	(16,736	)	$	447,318
Operating expenses	256,810			206			89,559			—			346,575			—			7,552			(16,736		)	337,391
Tokyo Gas Transaction gain	341,146			—			—			—			341,146			—			—			—			341,146
Equity in net earnings of subsidiaries	(9,227		)	—			(5,300		)	9,227			(5,300		)	9,190			—			(3,890		)	—
Operating income (loss)	409,957			402			17,003			9,227			436,589			9,190			9,184			(3,890		)	451,073
Fortune Creek accretion	—			—			—			—			—			—			—			(14,490		)	(14,490		)
Interest expense and other	(200,639		)	—			(24,490		)	—			(225,129		)	—			6			—			(225,123		)
Income tax (expense) benefit	(15,921		)	—			(2,142		)	—			(18,063		)	—			—			—			(18,063		)
Net income (loss)	$	193,397		$	402		$	(9,629	)	$	9,227		$	193,397		$	9,190		$	9,190		$	(18,380	)	$	193,397
Other comprehensive income (loss)	(29,014		)	—			(9,100		)	—			(38,114		)	—			—			—			(38,114		)
Equity in OCI of subsidiaries	(9,100		)	—			—			9,100			—			—			—			—			—
Comprehensive income (loss)	$	155,283		$	402		$	(18,729	)	$	18,327		$	155,283		$	9,190		$	9,190		$	(18,380	)	$	155,283
	For the Nine Months Ended September 30, 2012 (Restated)
	Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
	Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
				Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
							Subsidiaries						Subsidiaries			Subsidiaries
	(In thousands)
Revenue	$	429,774		$	3,390		$	54,202		$	(2,294	)	$	485,072		$	—		$	10,021		$	(10,021	)	$	485,072
Operating expenses	2,082,777			2,541			444,621			(2,294		)	2,527,645			—			6,093			(10,021		)	2,523,717
Crestwood earn-out	41,097			—			—			—			41,097			—			—			—			41,097
Equity in net earnings of subsidiaries	(305,205		)	—			(6,931		)	305,205			(6,931		)	3,959			—			2,972			—
Operating income (loss)	(1,917,111		)	849			(397,350		)	305,205			(2,008,407		)	3,959			3,928			2,972			(1,997,548		)
Fortune Creek accretion	—			—			—			—			—			—			—			(14,549		)	(14,549		)
Interest expense and other	(114,578		)	—			(8,060		)	—			(122,638		)	22			31			—			(122,585		)
Income tax (expense) benefit	227,582			—			99,356			—			326,938			—			—			3,637			330,575
Net income	$	(1,804,107	)	$	849		$	(306,054	)	$	305,205		$	(1,804,107	)	$	3,981		$	3,959		$	(7,940	)	$	(1,804,107	)
Other comprehensive income (loss)	(48,694		)	—			3,778			—			(44,916		)	—			—			—			(44,916		)
Equity in OCI of subsidiaries	3,778			—			—			(3,778		)	—			—			—			—			—
Comprehensive income (loss)	$	(1,849,023	)	$	849		$	(302,276	)	$	301,427		$	(1,849,023	)	$	3,981		$	3,959		$	(7,940	)	$	(1,849,023	)
Condensed Consolidating Statements of Cash Flows
	For the Nine Months Ended September 30, 2013
	Quicksilver			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Quicksilver
	Resources Inc.			Guarantor			Non-Guarantor			and Restricted			Non-Guarantor			Creek			Resources Inc.
				Subsidiaries			Subsidiaries			Subsidiaries			Subsidiaries						Consolidated
	(In thousands)
Net cash flow provided by (used in) operating activities	$	(113,029	)	$	(19	)	$	25,517		$	(87,531	)	$	—		$	6,428		$	(81,103	)
Purchases of property, plant and equipment	(53,291		)	19			(24,752		)	(78,024		)	—			(525		)	(78,549		)
Proceeds from Tokyo Gas Transaction	463,418			—			—			463,418			—			—			463,418
Proceeds from Synergy Transaction	42,297			—			—			42,297			—			—			42,297
Proceeds from sale of properties and equipment	2,977			—			17			2,994			—			—			2,994
Purchases of marketable securities	(142,823		)	—			—			(142,823		)	—			—			(142,823		)
Maturities and sales of marketable securities	13,178			—			—			13,178			—			—			13,178
Net cash flow provided by (used in) investing activities	325,756			19			(24,735		)	301,040			—			(525		)	300,515
Issuance of debt	1,170,266			—			3,040			1,173,306			—			—			1,173,306
Repayments of debt	(1,157,969		)	—			(150,413		)	(1,308,382		)	—			—			(1,308,382		)
Debt issuance costs paid	(25,868		)	—			—			(25,868		)	—			—			(25,868		)
Intercompany note	(147,103		)	—			147,103			—			—			—			—
Distribution of Fortune Creek Partnership funds	—			—			—			—			—			(8,079		)	(8,079		)
Purchase of treasury stock	(1,472		)	—			—			(1,472		)	—			—			(1,472		)
Net cash flow used in financing activities	(162,146		)	—			(270		)	(162,416		)	—			(8,079		)	(170,495		)
Effect of exchange rates on cash	—			—			(512		)	(512		)	—			3,122			2,610
Net increase (decrease) in cash and equivalents	50,581			—			—			50,581			—			946			51,527
Cash and equivalents at beginning of period	4,618			—			—			4,618			—			333			4,951
Cash and equivalents at end of period	$	55,199		$	—		$	—		$	55,199		$	—		$	1,279		$	56,478
	For the Nine Months Ended September 30, 2012 (Restated)
	Quicksilver			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Quicksilver
	Resources Inc.			Guarantor			Non-Guarantor			and Restricted			Non-Guarantor			Creek			Resources Inc.
				Subsidiaries			Subsidiaries			Subsidiaries			Subsidiaries						Consolidated
	(In thousands)
Net cash flow provided by operating activities	$	74,952		$	655		$	48,301		$	123,908		$	—		$	17,468		$	141,376
Purchases of property, plant and equipment	(199,136		)	(655		)	(227,509		)	(427,300		)	—			(9,872		)	(437,172		)
Proceeds from Crestwood earn-out	41,097			—			—			41,097			—			—			41,097
Proceeds from sale of properties and equipment	3,489			—			354			3,843			—			—			3,843
Net cash flow used in investing activities	(154,550		)	(655		)	(227,155		)	(382,360		)	—			(9,872		)	(392,232		)
Issuance of debt	177,500			—			190,146			367,646			—			—			367,646
Repayments of debt	(98,018		)	—			(13,097		)	(111,115		)	—			—			(111,115		)
Debt issuance costs paid	(1,998		)	—			(1,050		)	(3,048		)	—			—			(3,048		)
Distribution of Fortune Creek Partnership funds	—			—			—			—			—			(6,520		)	(6,520		)
Proceeds from exercise of stock options	11			—			—			11			—			—			11
Excess tax deductions on stock compensation	1,089			—			—			1,089			—			—			1,089
Purchase of treasury stock	(2,810		)	—			—			(2,810		)	—			—			(2,810		)
Net cash flow provided by (used in) financing activities	75,774			—			175,999			251,773			—			(6,520		)	245,253
Effect of exchange rates on cash	—			—			2,855			2,855			—			(2,962		)	(107		)
Net increase (decrease) in cash and equivalents	(3,824		)	—			—			(3,824		)	—			(1,886		)	(5,710		)
Cash and equivalents at beginning of period	363			—			—			363			—			12,783			13,146
Cash and equivalents at end of period	$	(3,461	)	$	—		$	—		$	(3,461	)	$	—		$	10,897		$	7,436

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	We operate in two geographic segments, the U.S. and Canada, where we are engaged in the exploration and production segment of the oil and gas industry. Additionally, we operate a significantly smaller midstream segment in the U.S. and Canada, where we provide natural gas gathering and processing services, primarily to our U.S. and Canadian exploration and production segments. Following the formation of our partnership with KKR, beginning in January 2012, we have additional midstream operations in Canada through Fortune Creek. Revenue earned by Fortune Creek for the gathering and processing of our gas is eliminated on a consolidated basis as is the GPT recognized by our producing properties. Based on the immateriality of our midstream segment, we have combined our U.S. and Canadian midstream information. We evaluate performance based on operating income and property and equipment costs incurred.
		Exploration &														Quicksilver Consolidated
		Production
		U.S.			Canada			Midstream		Corporate			Elimination
	For the Three Months Ended September 30:	(In thousands)
	2013
	Revenue	$	114,002		$	38,407		$	6,381	$	—		$	(5,674	)	$	153,116
	DD&A	8,402			4,114			1,300		574			—			14,390
	Operating income (loss)	56,911			11,076			3,107		(11,045		)	—			60,049
	Property and equipment costs incurred	15,147			4,288			1,615		(329		)	—			20,721
	2012 (Restated)
	Revenue	$	108,365		$	8,859		$	6,082	$	—		$	(5,118	)	$	118,188
	DD&A	23,205			8,938			1,281		590			—			34,014
	Impairment expense	479,905			66,282			4,945		—			—			551,132
	Operating income (loss)	(476,542		)	(82,528		)	443		(17,924		)	—			(576,551		)
	Property and equipment costs incurred	43,722			21,382			1,824		837			—			67,765
	For the Nine Months Ended September 30:
	2013
	Revenue	$	334,804		$	110,052		$	19,198	$	—		$	(16,736	)	447,318
	DD&A	29,745			12,458			3,947		1,761			—			47,911
	Operating income (loss)	456,624			30,126			9,593		(45,270		)	—			451,073
	Property and equipment costs incurred	50,459			9,972			2,369		9,655			—			72,455
	2012 (Restated)
	Revenue	$	429,776		$	52,249		$	15,363	$	—		$	(12,316	)	485,072
	DD&A	101,432			29,454			3,810		1,773			—			136,469
	Impairment expense	1,700,682			363,160			4,945		—			—			2,068,787
	Operating income (loss)	(1,559,594		)	(382,194		)	849		(56,609		)	—			(1,997,548		)
	Property and equipment costs incurred	160,699			178,783			13,263		6,284			—			359,029
	Property, plant and equipment-net
	30-Sep-13	$	452,023		$	303,265		$	101,038	$	6,606		$	—		$	862,932
	31-Dec-12	614,071			294,921			111,523		8,543			—			1,029,058
	Total assets
	30-Sep-13	847,466			365,058			112,483		6,606			—			$	1,331,613
	31-Dec-12	784,104			371,532			217,609		8,543			—			1,381,788

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]	'
Supplemental Cash Flow Information	'
	SUPPLEMENTAL CASH FLOW INFORMATION
	Cash paid (received) for interest and income taxes was as follows:
		For the Nine Months Ended
		September 30,
		2013		2012
		(In thousands)
	Interest, net of capitalized interest	$	227,189	$	141,811
	Income taxes	1,217		(1,528		)
	Other significant non-cash transactions were as follows:
		For the Nine Months Ended
		September 30,
		2013		2012
		(In thousands)
	Working capital related to capital expenditures	$	4,867	$	37,386

Transactions_With_Related_Part

Transactions With Related Parties	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Transactions With Related Parties	'
	TRANSACTIONS AND OTHER MATTERS WITH RELATED PARTIES
	As of September 30, 2013, members of the Darden family and entities controlled by them beneficially owned approximately 30% of our outstanding common stock. Glenn Darden and Anne Darden Self are officers and directors and Thomas Darden is an employee and director of Quicksilver.
	During the first nine months of 2013 and 2012, we paid $0.3 million and $0.4 million, respectively, for use of an airplane owned by an entity controlled by members of the Darden family. Usage rates were determined based upon comparable rates charged by third parties.
	Payments received from Mercury, a company owned by members of the Darden family, for sublease rentals, employee insurance coverage and administrative services were less than $0.1 million for the first nine months of 2013 and 2012.
	In August 2013, we paid $0.2 million to an entity controlled by members of the Darden family primarily for commission in connection with the sublease of a portion of our office space.
	In May 2013, we entered into an agreement with Thomas F. Darden with respect to Mr. Darden’s retirement and Mr. Darden’s provision of consulting services following his retirement. Effective May 15, 2013, Mr. Darden retired from his executive position and is expected to remain an employee that does not serve as an officer through December 31, 2013 and a member of the Board of Directors as Chairman Emeritus. While an employee, Mr. Darden will continue to receive his same base salary, benefits and, subject to the execution of a general release and waiver of claims, annual incentive compensation opportunity. In addition, he will be entitled to $12,500 per month, and additional reimbursements, with respect to certain business expenses. In recognition of his contributions to the Tokyo Gas Transaction, Mr. Darden received a cash bonus of $1.1 million paid in two equal installments in May 2013 and August 2013, and a stock option grant with an aggregate grant date fair value of $1.1 million granted in May 2013. Both the cash bonus and the stock option grant are included in the Tokyo Gas Transaction gain on our consolidated financial statements. In connection with his retirement, he is entitled to full vesting of his outstanding unvested equity awards (242,724 shares of restricted stock and 304,407 options); reimbursement of legal fees in connection with the agreement, up to $40,000; and payment of accrued and unused vacation and estimated COBRA premiums. Mr. Darden will be engaged as a consultant for the three-year period following his retirement and will receive a monthly consulting fee of $45,000. In addition, while a consultant, Mr. Darden will be entitled to an office allowance of $12,500 per month, and additional reimbursements, with respect to certain business expenses. In addition, Mr. Darden will be eligible to receive bonuses of up to $2.5 million in the aggregate under certain circumstances in connection with certain possible future strategic transactions occurring on or before December 31, 2016.

Derivatives_And_Fair_Value_Mea1

Derivatives And Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Credit Risk Derivatives, at Fair Value, Net [Abstract]	'
Estimated Fair Value Of Derivative Instruments Under Input Levels	'
		Asset Derivatives							Liability Derivatives
		30-Sep-13				31-Dec-12			30-Sep-13			31-Dec-12
		(in thousands)							(in thousands)
	Level 2 inputs	$	146,864			$	207,042		$	(390	)	$	959
	Level 3 inputs	14,467				11,595			3,562			16,526
	Total	$	161,331			$	218,637		$	3,172		$	17,485
Changes In Level 3 Fair Values	'
		For the Three Months Ended
		September 30,
		2013				2012
		(In thousands)
	Balance at beginning of period	$	(9,873	)		$	45,345
	Total gains (losses) for the period:
	Unrealized gain (loss) on derivatives	24,080				(51,685		)
	Settlements in production revenue	—				(825		)
	Settlements in net derivative gains (losses)	(3,302		)		(6,870		)
	Unrealized gains reported in OCI	—				409
	Balance at end of period	$	10,905			$	(13,626	)
	Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	24,026			$	(51,685	)
		For the Nine Months Ended
		September 30,
		2013				2012
		(In thousands)
	Balance at beginning of period	$	(4,931	)		$	150,989
	Total gains (losses) for the period:
	Unrealized gain (loss) on derivatives	24,618				(16,160		)
	Transfers out of Level 3	—				(153,418		)
	Settlements in production revenue	—				(5,600		)
	Settlements in net derivative gains (losses)	(8,782		)		(22,743		)
	Unrealized gains reported in OCI	—				33,306
	Balance at end of period	$	10,905			$	(13,626	)
	Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	26,788			$	(16,160	)
Price Collars And Swaps For Anticipated Natural Gas And NGL Production	'
	Production		Daily Production
	Year		Volume
			Natural Gas		NGL
			MMcfd		MBbld
	Remainder of 2013		200		6
	2014 (1)		170		4
	2015		150		—
	2016-2021		40		—
Net Deferred Hedge Gain in AOCI to be Released into Earnings in a Future Period	'
		(In thousands)
	Remainder of 2013	$	15,254
	2014	37,084
	2015	33,191
	2016	13,476
	2017	12,531
	2018 and thereafter	41,443
		$	152,979
Reduction Of Interest Expense Over The Life Of The Debt Instruments	'
		(In thousands)
	Remainder of 2013	$	492
	2014	2,039
	2015	2,194
	2016	569
		$	5,294
Estimated Fair Value Of Derivative Instruments	'
		Asset Derivatives								Liability Derivatives
		30-Sep-13				31-Dec-12				30-Sep-13			31-Dec-12
		(In thousands)								(In thousands)
	Derivatives not designated as hedges:
	Commodity contracts reported in:
	Current derivative assets	$	86,003			$	113,367			$	—		$	—
	Noncurrent derivative assets	75,403				107,542				75			2,272
	Current derivative liabilities	—				—				—			—
	Noncurrent derivative liabilities	448				92				3,620			17,577
	Total derivatives not designated as hedges	$	161,854			$	221,001			$	3,695		$	19,849
Carrying Value Of Derivatives	'
		For the Three Months Ended
		September 30,
		2012
		Commodity Hedges
		(In thousands)
	Derivative fair value at beginning of period	$	176,726
	Settlements in production revenue	(45,681		)
	Ineffectiveness reported in net derivative gains	(547		)
	Unrealized gains (losses) reported in OCI	(15,543		)
	Derivative fair value at end of period	$	114,955
		For the Nine Months Ended
		September 30,
		2012
		Commodity Hedges
		(In thousands)
	Derivative fair value at beginning of period	$	342,799
	Settlements in production revenue	(137,417		)
	Settlements in net derivative gains	(3,820		)
	Ineffectiveness reported in net derivative gains	1,022
	Unrealized gains reported in OCI	93,103
	Derecognition of hedge	(180,732		)
	Derivative fair value at end of period	$	114,955

Property_Plant_And_Equipment_T

Property, Plant And Equipment (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant, and Equipment [Table Text Block]	'
		30-Sep-13			31-Dec-12
		(In thousands)
	Oil and gas properties
	Subject to depletion	$	5,630,152		$	5,770,913
	Unevaluated costs	291,147			307,267
	Accumulated depletion	(5,291,615		)	(5,297,220		)
	Net oil and gas properties	629,684			780,960
	Other plant and equipment
	Pipelines and processing facilities	358,186			375,248
	General properties	79,619			75,147
	Accumulated depreciation	(204,557		)	(202,297		)
	Net other property and equipment	233,248			248,098
	Property, plant and equipment, net of accumulated depletion and depreciation	$	862,932		$	1,029,058

LongTerm_Debt_Tables

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Long-term Debt, Other Disclosures [Abstract]	'
Schedule Of Long-Term Debt Instruments	'
		30-Sep-13			31-Dec-12
		(in thousands)
	Combined Credit Agreements	$	149,736		$	388,150
	Senior Secured Second Lien Credit Agreement, net of unamortized discount	606,593			—
	Senior Secured Second Lien Notes due 2019, net of unamortized discount	194,110			—
	Senior notes due 2015, net of unamortized discount	10,466			435,851
	Senior notes due 2016, net of unamortized discount	8,032			579,795
	Senior notes due 2019, net of unamortized discount	293,083			292,622
	Senior notes due 2021, net of unamortized discount	308,853			—
	Senior subordinated notes due 2016	350,000			350,000
	Total debt	1,920,873			2,046,418
	Unamortized deferred gain-terminated interest rate swaps	5,294			16,788
	Current portion of long-term debt	—			—
	Long-term debt	$	1,926,167		$	2,063,206
Schedule of Outstanding Debt	'
			Priority on Collateral and Structural Seniority (1)
			Highest								Lowest
			priority								priority
			First Lien	Second Lien			Senior Unsecured				Senior Subordinated
			Combined Credit	Senior Secured Second Lien Credit Agreement		Senior Secured Second Lien Notes due 2019	2015	2016	2019	2021	Senior
			Agreements				Senior Notes	Senior Notes	Senior Notes	Senior Notes	Subordinated Notes
	Principal amount (2)		$350 million	$625 million		$200 million	$11 million	$8 million	$298 million	$325 million	$350 million
	Scheduled maturity date (3)		September 6, 2016	June 21, 2019		June 21, 2019	August 1, 2015	January 1, 2016	August 15, 2019	July 1, 2021	April 1, 2016
	Interest rate on outstanding borrowings at September 30, 2013 (4)		4.00%	7.00%		7.00%	8.25%	11.75%	9.13%	11.00%	7.12%
	Base interest rate options (5) (6)		LIBOR, ABR, CDOR	LIBOR floor of 1.25%; ABR floor of 2.25%		LIBOR floor of 1.25%	N/A	N/A	N/A	N/A	N/A
	Financial covenants (7)		- Minimum current ratio of 1.0	N/A		N/A	N/A	N/A	N/A	N/A	N/A
			- Minimum EBITDA to cash interest expense ratio of 1.25
			- Maximum senior secured debt leverage ratio of 2.0
	Significant restrictive covenants (7)		- Incurrence of debt	- Incurrence of debt		- Incurrence of debt	- Asset sales	- Asset sales	- Incurrence of debt	- Incurrence of debt	- Incurrence of debt
			- Incurrence of liens	- Incurrence of liens and 1st lien cap		- Incurrence of liens and 1st lien cap			- Incurrence of liens	- Incurrence of liens	- Incurrence of liens
			- Payment of dividends	-Payment of dividends		-Payment of dividends			-Payment of dividends	-Payment of dividends	-Payment of dividends
			- Equity purchases	- Equity purchases		- Equity purchases			- Equity purchases	- Equity purchases	- Equity purchases
			- Asset sales	- Asset sales		- Asset sales			- Asset sales	- Asset sales	- Asset sales
			- Affiliate transactions	- Affiliate transactions		- Affiliate transactions			- Affiliate transactions	- Affiliate transactions	- Affiliate transactions
			- Limitations on derivatives and investments
	Optional redemption (7)		Any time	Any time,		Any time,	August 1,	July 1,	August 15,	July 1,	April 1,
				subject to		subject to	2013: 101.938	2013: 105.875	2014: 104.563	2019: 102.000	2013: 101.188
				re-pricing event		re-pricing event	2014: par	2014: 102.938	2015: 103.042	2020: par	2014: par
				June 21,		June 21,		2015: par	2016: 101.521
				2014: 102		2014: 102			2017: par
				2015: 101		2015: 101
	Make-whole redemption (7)		N/A	N/A		N/A	N/A	N/A	Callable prior to	Callable prior to	N/A
									August 15, 2014 at	July 1, 2019 at
									make-whole call price of	make-whole call price of
									Treasury +50 bps	Treasury +50 bps
	Change of control (7)		Event of default	Put at 101% of		Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of	Put at 101% of
				principal plus		principal plus	principal plus	principal plus	principal plus	principal plus	principal plus
				accrued interest		accrued interest	accrued interest	accrued interest	accrued interest	accrued interest	accrued interest
	Equity clawback (7)		N/A	N/A		N/A	N/A	N/A	N/A	Redeemable until	N/A
										1-Jul-16
										at 111.00%, plus accrued
										interest for up to 35%
	Estimated fair value (8)		$149.7 million	$600 million		$192 million	$10.1 million	$8.3 million	$271.6 million	$307.1 million	$332.9 million
	(1)	Borrowings under the Amended and Restated U.S. Credit Facility, Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are guaranteed by certain of Quicksilver’s domestic subsidiaries and are secured (on a first priority basis with respect to the Amended and Restated U.S. Credit Facility and on a second priority basis with respect to the Senior Secured Second Lien Credit Agreement and the Senior Secured Second Lien Notes due 2019) by 100% of the equity interests of each of Cowtown Pipeline Management, Inc., Cowtown Pipeline Funding, Inc., Cowtown Gas Processing L.P., Cowtown Pipeline L.P., Barnett Shale Operating LLC, Silver Stream Pipeline Company LLC, QPP Parent LLC and QPP Holdings LLC (collectively, the “Domestic Pledged Equity”), 65% of the equity interests of Quicksilver Resources Canada Inc. (“Quicksilver Canada”) and Quicksilver Production Partners Operating Ltd. (with respect to the Amended and Restated U.S. Credit Facility, on a ratable basis with borrowings under the Amended and Restated Canadian Credit Facility) and the majority of Quicksilver's domestic proved oil and gas properties and related assets, (the “Domestic Pledged Property”). Borrowings under the Amended and Restated Canadian Credit Facility are guaranteed by Quicksilver and certain of its domestic subsidiaries and are secured by the Domestic Pledged Equity, the Domestic Pledged Property, 100% of the equity interests of Quicksilver Canada (65% of which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and any Canadian restricted subsidiaries, under the Amended and Restated Canadian Credit Facility, and 65% of the equity interests of Quicksilver Production Partners Operating Ltd. (which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and the majority of Quicksilver Canada's oil and gas properties and related assets. The other debt presented is based upon structural seniority and priority of payment.
	(2)	The principal amount for the Combined Credit Agreements represents the global borrowing base as of September 30, 2013.
	(3)	The Combined Credit Agreements are required to be repaid 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes, the 2016 Senior Subordinated Notes, the Senior Secured Second Lien Credit Agreement or the Senior Secured Second Lien Notes due 2019, if on the applicable date any amount of such debt remains outstanding. The Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are required to be repaid (1) 91 days prior to the maturity of the 2019 Senior Notes if more than $100 million of the 2019 Senior Notes remain outstanding and (2) 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes or the 2016 Senior Subordinated Notes if on the applicable date the aggregate amount of all such notes remaining outstanding is greater than $100 million.
	(4)	Represents the weighted average borrowing rate payable to lenders.
	(5)	Amounts outstanding under the Amended and Restated U.S. Credit Facility bear interest, at our election, at (i) adjusted LIBOR (as defined in the Amended and Restated U.S. Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii) ABR (as defined in the Amended and Restated U.S. Credit Facility), which is the greatest of (a) the prime rate announced by JPMorgan, (b) the federal funds rate plus 0.50% and (c) adjusted LIBOR for an interest period of one month plus 1.00%, plus, in each case under scenario (ii), an applicable margin between 1.75% and 2.75%. We also pay a per annum fee on the LC Exposure (as defined in the Amended and Restated U.S. Credit Facility) of all letters of credit issued under the Amended and Restated U.S. Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated U.S. Credit Facility of 0.50%.
	(6)	Amounts outstanding under the Amended and Restated Canadian Credit Facility bear interest, at our election, at (i) the CDOR Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii) the Canadian Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75%, (iii) the U.S. Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75% and (iv) adjusted LIBOR (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%. We pay a per annum fee on the LC Exposure (as defined in the Amended and Restated Canadian Credit Facility) of all letters of credit issued under the Amended and Restated Canadian Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated Canadian Credit Facility of 0.50%.
	(7)	The information presented in this table is qualified in all respects by reference to the full text of the covenants, provisions and related definitions contained in the documents governing the various components of our debt.
	(8)	The estimated fair value is determined using market quotations based on recent trade activity for fixed rate obligations (“Level 2” inputs). Our Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 feature variable interest rates and we estimate their fair value by using market quotations based on recent trade activity (“Level 3” input). We consider our Combined Credit Agreements which have a variable interest rate to have a fair value equal to their carrying value (“Level 1” input).

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2013
Asset Retirement Obligation [Abstract]	'
Estimated Asset Retirement Obligation Activity	'
		(In thousands)
	Beginning asset retirement obligations	$	116,526
	Additional liability incurred	3,193
	Change in estimates	586
	Accretion expense	3,917
	Asset retirement costs incurred	(1,539		)
	Settlement of liability in excess of obligation recorded	867
	Disposition	(21,910		)
	Currency translation adjustment	(1,903		)
	Ending asset retirement obligations	99,737
	Less current portion	(577		)
	Long-term asset retirement obligation	$	99,160

Quicksilver_Stockholders_Equit1

Quicksilver Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]	'
Assumptions For The Black-Scholes Option Pricing Model For Stock Options Issued	'
		2013		2012
	Weighted avg grant date fair value	$1.05		$4.21
	Weighted avg risk-free interest rate	1.31%		1.14%
	Expected life	4.9 years		6.0 years
	Wtd avg volatility	69.00%		68.20%
	Expected dividends	—		—
Stock Option Activity	'
		Shares			Wtd Avg		Wtd Avg		Aggregate
					Exercise		Remaining		Intrinsic Value
					Price		Contractual Life
							(In years)		(In thousands)
	Outstanding at January 1, 2013	4,979,980			$	10.23
	Granted	2,037,467			1.95
	Expired	(151,867	)		7.76
	Outstanding at September 30, 2013	6,865,580			$	7.83	7.1		$	—
	Exercisable at September 30, 2013	4,670,679			$	9.28	6.2		$	—
Restricted Stock And Stock Unit Activity	'
		Payable in shares					Payable in cash
		Shares			Wtd Avg		Shares			Wtd Avg
					Grant Date					Grant Date
					Fair Value					Fair Value
	Outstanding at January 1, 2013	3,099,135			$	8.48	678,217			$	7.71
	Granted	6,102,133			2.74		1,468,695			2.83
	Vested	(2,018,457	)		7.57		(284,406	)		8.51
	Forfeited	(1,303,113	)		3.63		(298,138	)		3.88
	Outstanding at September 30, 2013	5,879,698			$	3.91	1,564,368			$	3.72

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Reconciliation Of Components Used To Compute Basic And Diluted Earnings (Loss) Per Common Share	'
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
					(Restated)						(Restated)
		(In thousands, except per share data)
	Net income (loss) attributable to Quicksilver	$	10,577		$	(790,520	)	$	193,397		$	(1,804,107	)
	Basic income allocable to participating securities (1)	(312		)	—			$	(5,111	)	$	—
	Income (loss) available to shareholders	$	10,265		$	(790,520	)	$	188,286		$	(1,804,107	)
	Weighted average common shares – basic	171,682			170,179			171,403			170,054
	Effect of dilutive securities (2)
	Share-based compensation awards	311			—			170			—
	Weighted average common shares – diluted	171,993			170,179			171,573			170,054
	Earnings (loss) per common share – basic	$	0.06		$	(4.65	)	$	1.1		$	(10.61	)
	Earnings (loss) per common share – diluted	$	0.06		$	(4.65	)	$	1.1		$	(10.61	)
	(1)	Restricted share awards that contain nonforfeitable rights to dividends are participating securities and, therefore, should be included in computing earnings using the two-class method. Participating securities, however, do not participate in undistributed net losses because there is no contractual obligation to do so.
	(2)	For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2013
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Balance Sheets	'
		30-Sep-13
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
		(In thousands)
	ASSETS
	Current assets	$	315,788		$	10,016		$	61,101		$	(35,986	)	$	350,919		$	2,443		$	1,428		$	(4,842	)	$	349,948
	Property and equipment	457,139			15,757			304,754			—			777,650			—			85,282			—			862,932
	Investment in subsidiaries (equity method)	(211,041		)	—			(33,931		)	211,041			(33,931		)	(33,931		)	—			67,862			—
	Other assets	476,322			—			33,134			(390,723		)	118,733			—			—			—			118,733
	Total assets	$	1,038,208		$	25,773		$	365,058		$	(215,668	)	$	1,213,371		$	(31,488	)	$	86,710		$	63,020		$	1,331,613
	LIABILITIES AND EQUITY
	Current liabilities	$	107,325		$	11,802		$	35,835		$	(35,986	)	$	118,976		$	2,423		$	(899	)	$	(4,842	)	$	115,658
	Long-term liabilities	1,895,402			19,242			522,245			(390,723		)	2,046,166			—			1,575			132,732			2,180,473
	Stockholders' equity	(964,519		)	(5,271		)	(193,022		)	211,041			(951,771		)	(33,911		)	86,034			(64,870		)	(964,518		)
	Total liabilities and equity	$	1,038,208		$	25,773		$	365,058		$	(215,668	)	$	1,213,371		$	(31,488	)	$	86,710		$	63,020		$	1,331,613
		December 31, 2012
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources
		Inc.			Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Inc.
								Subsidiaries						Subsidiaries			Subsidiaries									Consolidated
		(In thousands)
	ASSETS
	Current assets	$	261,130		$	105,695		$	76,088		$	(222,586	)	$	220,327		$	13,250		$	391		$	(26,455	)	$	207,513
	Property and equipment	621,073			20,007			296,462			—			937,542			—			91,516			—			1,029,058
	Investment in subsidiaries	(191,725		)	—			(42,883		)	191,725			(42,883		)	(42,905		)	—			85,788			—
	(equity method)
	Other assets	346,972			—			41,865			(243,620		)	145,217			—			—			—			145,217
	Total assets	$	1,037,450		$	125,702		$	371,532		$	(274,481	)	$	1,260,203		$	(29,655	)	$	91,907		$	59,333		$	1,381,788
	LIABILITIES AND EQUITY
	Current liabilities	$	255,678		$	112,133		$	33,475		$	(222,586	)	$	178,700		$	13,230		$	2,316		$	(26,455	)	$	167,791
	Long-term liabilities	1,914,568			19,242			524,107			(243,620		)	2,214,297			—			1,585			130,912			2,346,794
	Stockholders' equity	(1,132,796		)	(5,673		)	(186,050		)	191,725			(1,132,794		)	(42,885		)	88,006			(45,124		)	(1,132,797		)
	Total liabilities and equity	$	1,037,450		$	125,702		$	371,532		$	(274,481	)	$	1,260,203		$	(29,655	)	$	91,907		$	59,333		$	1,381,788
Condensed Consolidating Statements Of Income	'
		For the Nine Months Ended September 30, 2013
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
		(In thousands)
	Revenue	$	334,848		$	608		$	111,862		$	—		$	447,318		$	—		$	16,736		$	(16,736	)	$	447,318
	Operating expenses	256,810			206			89,559			—			346,575			—			7,552			(16,736		)	337,391
	Tokyo Gas Transaction gain	341,146			—			—			—			341,146			—			—			—			341,146
	Equity in net earnings of subsidiaries	(9,227		)	—			(5,300		)	9,227			(5,300		)	9,190			—			(3,890		)	—
	Operating income (loss)	409,957			402			17,003			9,227			436,589			9,190			9,184			(3,890		)	451,073
	Fortune Creek accretion	—			—			—			—			—			—			—			(14,490		)	(14,490		)
	Interest expense and other	(200,639		)	—			(24,490		)	—			(225,129		)	—			6			—			(225,123		)
	Income tax (expense) benefit	(15,921		)	—			(2,142		)	—			(18,063		)	—			—			—			(18,063		)
	Net income (loss)	$	193,397		$	402		$	(9,629	)	$	9,227		$	193,397		$	9,190		$	9,190		$	(18,380	)	$	193,397
	Other comprehensive income (loss)	(29,014		)	—			(9,100		)	—			(38,114		)	—			—			—			(38,114		)
	Equity in OCI of subsidiaries	(9,100		)	—			—			9,100			—			—			—			—			—
	Comprehensive income (loss)	$	155,283		$	402		$	(18,729	)	$	18,327		$	155,283		$	9,190		$	9,190		$	(18,380	)	$	155,283
		For the Nine Months Ended September 30, 2012 (Restated)
		Quicksilver			Restricted			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Consolidated			Quicksilver
		Resources Inc.			Guarantor			Non-			Subsidiary			and			Non-			Creek			Eliminations			Resources Inc.
					Subsidiaries			Guarantor			Eliminations			Restricted			Guarantor									Consolidated
								Subsidiaries						Subsidiaries			Subsidiaries
		(In thousands)
	Revenue	$	429,774		$	3,390		$	54,202		$	(2,294	)	$	485,072		$	—		$	10,021		$	(10,021	)	$	485,072
	Operating expenses	2,082,777			2,541			444,621			(2,294		)	2,527,645			—			6,093			(10,021		)	2,523,717
	Crestwood earn-out	41,097			—			—			—			41,097			—			—			—			41,097
	Equity in net earnings of subsidiaries	(305,205		)	—			(6,931		)	305,205			(6,931		)	3,959			—			2,972			—
	Operating income (loss)	(1,917,111		)	849			(397,350		)	305,205			(2,008,407		)	3,959			3,928			2,972			(1,997,548		)
	Fortune Creek accretion	—			—			—			—			—			—			—			(14,549		)	(14,549		)
	Interest expense and other	(114,578		)	—			(8,060		)	—			(122,638		)	22			31			—			(122,585		)
	Income tax (expense) benefit	227,582			—			99,356			—			326,938			—			—			3,637			330,575
	Net income	$	(1,804,107	)	$	849		$	(306,054	)	$	305,205		$	(1,804,107	)	$	3,981		$	3,959		$	(7,940	)	$	(1,804,107	)
	Other comprehensive income (loss)	(48,694		)	—			3,778			—			(44,916		)	—			—			—			(44,916		)
	Equity in OCI of subsidiaries	3,778			—			—			(3,778		)	—			—			—			—			—
	Comprehensive income (loss)	$	(1,849,023	)	$	849		$	(302,276	)	$	301,427		$	(1,849,023	)	$	3,981		$	3,959		$	(7,940	)	$	(1,849,023	)
Condensed Consolidating Statements Of Cash Flows	'
		For the Nine Months Ended September 30, 2013
		Quicksilver			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Quicksilver
		Resources Inc.			Guarantor			Non-Guarantor			and Restricted			Non-Guarantor			Creek			Resources Inc.
					Subsidiaries			Subsidiaries			Subsidiaries			Subsidiaries						Consolidated
		(In thousands)
	Net cash flow provided by (used in) operating activities	$	(113,029	)	$	(19	)	$	25,517		$	(87,531	)	$	—		$	6,428		$	(81,103	)
	Purchases of property, plant and equipment	(53,291		)	19			(24,752		)	(78,024		)	—			(525		)	(78,549		)
	Proceeds from Tokyo Gas Transaction	463,418			—			—			463,418			—			—			463,418
	Proceeds from Synergy Transaction	42,297			—			—			42,297			—			—			42,297
	Proceeds from sale of properties and equipment	2,977			—			17			2,994			—			—			2,994
	Purchases of marketable securities	(142,823		)	—			—			(142,823		)	—			—			(142,823		)
	Maturities and sales of marketable securities	13,178			—			—			13,178			—			—			13,178
	Net cash flow provided by (used in) investing activities	325,756			19			(24,735		)	301,040			—			(525		)	300,515
	Issuance of debt	1,170,266			—			3,040			1,173,306			—			—			1,173,306
	Repayments of debt	(1,157,969		)	—			(150,413		)	(1,308,382		)	—			—			(1,308,382		)
	Debt issuance costs paid	(25,868		)	—			—			(25,868		)	—			—			(25,868		)
	Intercompany note	(147,103		)	—			147,103			—			—			—			—
	Distribution of Fortune Creek Partnership funds	—			—			—			—			—			(8,079		)	(8,079		)
	Purchase of treasury stock	(1,472		)	—			—			(1,472		)	—			—			(1,472		)
	Net cash flow used in financing activities	(162,146		)	—			(270		)	(162,416		)	—			(8,079		)	(170,495		)
	Effect of exchange rates on cash	—			—			(512		)	(512		)	—			3,122			2,610
	Net increase (decrease) in cash and equivalents	50,581			—			—			50,581			—			946			51,527
	Cash and equivalents at beginning of period	4,618			—			—			4,618			—			333			4,951
	Cash and equivalents at end of period	$	55,199		$	—		$	—		$	55,199		$	—		$	1,279		$	56,478
		For the Nine Months Ended September 30, 2012 (Restated)
		Quicksilver			Restricted			Restricted			Quicksilver			Unrestricted			Fortune			Quicksilver
		Resources Inc.			Guarantor			Non-Guarantor			and Restricted			Non-Guarantor			Creek			Resources Inc.
					Subsidiaries			Subsidiaries			Subsidiaries			Subsidiaries						Consolidated
		(In thousands)
	Net cash flow provided by operating activities	$	74,952		$	655		$	48,301		$	123,908		$	—		$	17,468		$	141,376
	Purchases of property, plant and equipment	(199,136		)	(655		)	(227,509		)	(427,300		)	—			(9,872		)	(437,172		)
	Proceeds from Crestwood earn-out	41,097			—			—			41,097			—			—			41,097
	Proceeds from sale of properties and equipment	3,489			—			354			3,843			—			—			3,843
	Net cash flow used in investing activities	(154,550		)	(655		)	(227,155		)	(382,360		)	—			(9,872		)	(392,232		)
	Issuance of debt	177,500			—			190,146			367,646			—			—			367,646
	Repayments of debt	(98,018		)	—			(13,097		)	(111,115		)	—			—			(111,115		)
	Debt issuance costs paid	(1,998		)	—			(1,050		)	(3,048		)	—			—			(3,048		)
	Distribution of Fortune Creek Partnership funds	—			—			—			—			—			(6,520		)	(6,520		)
	Proceeds from exercise of stock options	11			—			—			11			—			—			11
	Excess tax deductions on stock compensation	1,089			—			—			1,089			—			—			1,089
	Purchase of treasury stock	(2,810		)	—			—			(2,810		)	—			—			(2,810		)
	Net cash flow provided by (used in) financing activities	75,774			—			175,999			251,773			—			(6,520		)	245,253
	Effect of exchange rates on cash	—			—			2,855			2,855			—			(2,962		)	(107		)
	Net increase (decrease) in cash and equivalents	(3,824		)	—			—			(3,824		)	—			(1,886		)	(5,710		)
	Cash and equivalents at beginning of period	363			—			—			363			—			12,783			13,146
	Cash and equivalents at end of period	$	(3,461	)	$	—		$	—		$	(3,461	)	$	—		$	10,897		$	7,436

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Operating Income And Property And Equipment Costs Incurred	'
		Exploration &														Quicksilver Consolidated
		Production
		U.S.			Canada			Midstream		Corporate			Elimination
	For the Three Months Ended September 30:	(In thousands)
	2013
	Revenue	$	114,002		$	38,407		$	6,381	$	—		$	(5,674	)	$	153,116
	DD&A	8,402			4,114			1,300		574			—			14,390
	Operating income (loss)	56,911			11,076			3,107		(11,045		)	—			60,049
	Property and equipment costs incurred	15,147			4,288			1,615		(329		)	—			20,721
	2012 (Restated)
	Revenue	$	108,365		$	8,859		$	6,082	$	—		$	(5,118	)	$	118,188
	DD&A	23,205			8,938			1,281		590			—			34,014
	Impairment expense	479,905			66,282			4,945		—			—			551,132
	Operating income (loss)	(476,542		)	(82,528		)	443		(17,924		)	—			(576,551		)
	Property and equipment costs incurred	43,722			21,382			1,824		837			—			67,765
	For the Nine Months Ended September 30:
	2013
	Revenue	$	334,804		$	110,052		$	19,198	$	—		$	(16,736	)	447,318
	DD&A	29,745			12,458			3,947		1,761			—			47,911
	Operating income (loss)	456,624			30,126			9,593		(45,270		)	—			451,073
	Property and equipment costs incurred	50,459			9,972			2,369		9,655			—			72,455
	2012 (Restated)
	Revenue	$	429,776		$	52,249		$	15,363	$	—		$	(12,316	)	485,072
	DD&A	101,432			29,454			3,810		1,773			—			136,469
	Impairment expense	1,700,682			363,160			4,945		—			—			2,068,787
	Operating income (loss)	(1,559,594		)	(382,194		)	849		(56,609		)	—			(1,997,548		)
	Property and equipment costs incurred	160,699			178,783			13,263		6,284			—			359,029
	Property, plant and equipment-net
	30-Sep-13	$	452,023		$	303,265		$	101,038	$	6,606		$	—		$	862,932
	31-Dec-12	614,071			294,921			111,523		8,543			—			1,029,058
	Total assets
	30-Sep-13	847,466			365,058			112,483		6,606			—			$	1,331,613
	31-Dec-12	784,104			371,532			217,609		8,543			—			1,381,788

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]	'
Cash Paid Or Received For Interest And Income Taxes	'
		For the Nine Months Ended
		September 30,
		2013		2012
		(In thousands)
	Interest, net of capitalized interest	$	227,189	$	141,811
	Income taxes	1,217		(1,528		)
Other Significant Non-cash Transactions	'
		For the Nine Months Ended
		September 30,
		2013		2012
		(In thousands)
	Working capital related to capital expenditures	$	4,867	$	37,386

Accounting_Policies_And_Disclo1

Accounting Policies And Disclosures (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Restatement Adjustment [Member]

Restatement Adjustment [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

UNITED STATES

UNITED STATES

UNITED STATES

UNITED STATES

UNITED STATES

UNITED STATES

CANADA

CANADA

CANADA

CANADA

CANADA

CANADA

Restatement Adjustment [Member]

Restatement Adjustment [Member]

Restatement Adjustment [Member]

Restatement Adjustment [Member]

Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Production

$104,546,000

$156,288,000

[1]

$358,281,000

$473,053,000

[1]

'

'

'

'

'

'

'

'

'

'

($300,000)

($2,600,000)

'

'

'

'

($1,100,000)

($4,400,000)

Shareholders Equity

-964,518,000

-571,831,000

-964,518,000

-571,831,000

-1,132,797,000

1,261,919,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Derivative Instruments, Net, Pretax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-42,800,000

100,000

'

'

'

'

-15,300,000

200,000

Impairment of Oil and Gas Properties

0

551,132,000

[1]

0

2,068,787,000

[1]

'

'

'

'

'

'

479,905,000

1,042,700,000

178,000,000

1,700,682,000

43,400,000

303,100,000

66,282,000

157,000,000

139,900,000

363,160,000

-39,100,000

164,200,000

Depletion

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-3,300,000

-4,600,000

'

'

'

'

-5,900,000

-8,500,000

Income tax (expense) benefit

-5,966,000

-166,494,000

[1]

-18,063,000

330,575,000

[1]

'

'

'

'

'

'

'

'

'

'

75,300,000

-900,000

'

'

'

'

8,800,000

-40,000,000

Net income (loss)

10,577,000

-790,520,000

193,397,000

-1,804,107,000

'

'

138,800,000

419,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent

($8,794,000)

($46,615,000)

($38,114,000)

($44,916,000)

'

'

($34,700,000)

($5,200,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings (loss) per common share - diluted

$0.06

[2]

($4.65)

[1],[2]

$1.10

[2]

($10.61)

[1],[2]

'

'

($0.82)

($2.47)

($3.83)

($8.14)

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Note 1 contains additional information

[2]

For the three months ended SeptemberB 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended SeptemberB 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended SeptemberB 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended SeptemberB 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.

Crestwood_EarnOut_Details

Crestwood Earn-Out (Details) (kwk_CrestwoodLP [Member], USD $)	Mar. 31, 2012
In Millions, unless otherwise specified
kwk_CrestwoodLP [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax	$41

Divestitures_Divestitures_Deta

Divestitures Divestitures (Details) (USD $)	3 Months Ended					3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2013	Apr. 30, 2013	Sep. 30, 2013
	acre	Southern Alberta Basin [Member]	Barnett Shale [Member]	Barnett Shale [Member]	Barnett Shale [Member]	Tokyo Gas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'
Approximate Gross Acres Eni West Texas Total	52,500	'	'	'	'	'
Eni Funding of West Texas Transaction	$52	'	'	'	'	'
Joint Interest Ownership After Complete Three Phases	50.00%	'	'	'	'	'
Phase One Eni Funding Percent	100.00%	'	'	'	'	'
Completion of Phase One Joint Interest Earned	50.00%	'	'	'	'	'
Phase Two Approximate Gross Acres	7,500	'	'	'	'	'
Eni Funding Percent for Phase Three	100.00%	'	'	'	'	'
Equity Method Investment, Ownership Percentage	'	'	'	'	25.00%	'
Significant Acquisitions and Disposals, Terms	'	'46	'485	'	'	'
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	'	42.3	'	'	464	'
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds, Estimated Final Adjustment	'	'	'	'	0.6	'
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax	'	'	'	7.8	341.1	'
Oil and Gas Property Decrease due to Gain	'	'	'	'	'	$110.70

Derivatives_And_Fair_Value_Mea2

Derivatives And Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2010
			MMcf
Anticipated Natural Gas Basis Swap Production For Second Year	'	'	40	'	'
Realized Gain on Derivative Instruments, Gross, Pretax	$8,009,000	$12,376,000	$14,129,000	$35,059,000	'
Cash received in settlement of hedge	'	'	'	'	41,500,000
Interest previously accrued and earned	'	'	'	'	10,700,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	'	'	'	'	30,800,000
Senior notes maturity	'	'	'	'	'2015
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	'	'	8,300,000	'	'
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	'	'	11,500,000	3,800,000	'
Remaining deferred gains on early settlements from interest rate swaps	'	'	5,300,000	'	'
Gains and losses from the effective portion of derivative assets and liabilities held in AOCI expected to be reclassified into earnings	$29,500,000	'	$29,500,000	'	'
Term of derivative instrument	'	'	'10 years	'	'
Gas 2013, MMcfd	'	'	200	'	'
Anticipated NGL Production For 2013	'	'	6	'	'
Gas 2014, MMcfd	'	'	170	'	'
Anticipated NGL Production For Second Year	'	'	4	'	'
Gas 2015, MMcfd	'	'	150	'	'
Anticipated NGL Production For Third Year	'	'	0	'	'
Gas 2016-2021, MMcfd	'	'	40	'	'
Anticipated NGL Production Thereafter	'	'	0	'	'
Fair Value Inputs, Level 3 [Member]	'	'	'	'	'
Natural gas hedges original tenure	'	'	'10 years	'	'
Fair Value Inputs, Level 3 [Member] | Maximum [Member]	'	'	'	'	'
Unobservable inputs included within the fair value calculation	5.61	'	5.61	'	'
Fair Value Inputs, Level 3 [Member] | Minimum [Member]	'	'	'	'	'
Unobservable inputs included within the fair value calculation	3.5	'	3.5	'	'

Derivatives_And_Fair_Value_Mea3

Derivatives And Fair Value Measurements (Estimated Fair Value Of Derivative Instruments Under Input Levels) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Asset Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	$161,331	$218,637
Asset Derivatives [Member] | Fair Value Inputs, Level 2 [Member] | Commodity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	146,864	207,042
Asset Derivatives [Member] | Fair Value Inputs, Level 3 [Member] | Commodity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	14,467	11,595
Liability Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	3,172	17,485
Liability Derivatives [Member] | Fair Value Inputs, Level 2 [Member] | Commodity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	-390	959
Liability Derivatives [Member] | Fair Value Inputs, Level 3 [Member] | Commodity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated fair value of derivative instruments	$3,562	$16,526

Derivatives_And_Fair_Value_Mea4

Derivatives And Fair Value Measurements (Changes In Level 3 Fair Values) (Details) (Fair Value Inputs, Level 3 [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Balance at beginning of period	($9,873)	$45,345	($4,931)	$150,989
Unrealized gain (loss) on derivatives	24,080	-51,685	24,618	16,160
Transfers out of Level 3	'	'	0	-153,418
Unrealized gains reported in OCI	0	409	0	33,306
Balance at end of period	10,905	-13,626	10,905	-13,626
Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	24,026	-51,685	26,788	-16,160
Production Revenue [Member]	'	'	'	'
Settlements	0	-825	0	-5,600
Other Revenue [Member]	'	'	'	'
Settlements	($3,302)	($6,870)	($8,782)	($22,743)

Derivatives_And_Fair_Value_Mea5

Derivatives And Fair Value Measurements (Price Collars And Swaps For Anticipated Natural Gas And NGL Production) (Details)	9 Months Ended
	Sep. 30, 2013
	MMcf
Credit Risk Derivatives, at Fair Value, Net [Abstract]	'
Gas 2013, MMcfd	200
Gas 2014, MMcfd	170
Gas 2015, MMcfd	150
Gas 2016-2021, MMcfd	40

Derivatives_And_Fair_Value_Mea6

Derivatives And Fair Value Measurements (Reduction Of Interest Expense Over The Life Of The Debt Instruments) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Credit Risk Derivatives, at Fair Value, Net [Abstract]	'
Remainder of 2013	$492
2014	2,039
2015	2,194
2016	569
Reduction of interest expense over the life of the debt instruments, total	$5,294

Derivatives_And_Fair_Value_Mea7

Derivatives And Fair Value Measurements (Estimated Fair Value Of Derivative Instruments) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Current derivative assets	$86,003	$113,367
Noncurrent derivative assets	75,328	105,270
Noncurrent derivative liabilities	3,172	17,485
Asset Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Total derivative assets	161,854	221,001
Liability Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Total derivative liabilities	3,695	19,849
Not Designated as Hedging Instrument [Member] | Asset Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Current derivative assets	86,003	113,367
Noncurrent derivative assets	75,403	107,542
Current derivative liabilities	0	0
Noncurrent derivative liabilities	448	92
Not Designated as Hedging Instrument [Member] | Liability Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Current derivative assets	0	0
Noncurrent derivative assets	75	2,272
Current derivative liabilities	0	0
Noncurrent derivative liabilities	$3,620	$17,577

Derivatives_And_Fair_Value_Mea8

Derivatives And Fair Value Measurements (Carrying Value Of Derivatives) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]	'	'		'	'
Settlements in production revenue	($11,139)	($34,145)	[1]	($37,181)	($99,726)	[1]
Cash Flow Derivatives [Member]	'	'		'	'
Derivatives, Fair Value [Line Items]	'	'		'	'
Derivative fair value at beginning of period	'	176,726		'	342,799
Ineffectiveness reported in net derivative gains	'	-547		'	1,022
Unrealized gains (losses) reported in OCI	'	-15,543		'	93,103
Derecognition of hedges	'	'		'	-180,732
Derivative fair value at end of period	'	114,955		'	114,955
Production Revenue [Member] | Cash Flow Derivatives [Member]	'	'		'	'
Derivatives, Fair Value [Line Items]	'	'		'	'
Settlements in production revenue	'	-45,681		'	137,417
Derivative gains (losses) [Member] | Cash Flow Derivatives [Member]	'	'		'	'
Derivatives, Fair Value [Line Items]	'	'		'	'
Settlements in net derivative (gains) losses	'	'		'	$3,820
[1]	Note 1 contains additional information

Derivatives_And_Fair_Value_Mea9

Derivatives And Fair Value Measurements Derivatives, Investments And Fair Value Measurements (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Fixed Income Securities [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$19,902
Held-to-maturity Securities, Unrecognized Holding Gain	0
Held-to-maturity Securities, Unrecognized Holding Loss	-22
Held-to-maturity Securities, Fair Value	19,880
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	109,910
Held-to-maturity Securities, Unrecognized Holding Gain	34
Held-to-maturity Securities, Unrecognized Holding Loss	-31
Held-to-maturity Securities, Fair Value	109,913
Debt Securities [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	129,812
Held-to-maturity Securities, Unrecognized Holding Gain	34
Held-to-maturity Securities, Unrecognized Holding Loss	-53
Held-to-maturity Securities, Fair Value	$129,793

Recovered_Sheet1

Derivatives And Fair Value Measurements (Net Deferred Hedge Gain in AOCI to be Released into Earnings) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Credit Risk Derivatives, at Fair Value, Net [Abstract]	'
Net Deferred Hedge Gain in AOCI to be Released into Earnings Remainder of Fiscal Year	$15,254
Net Deferred Hedge Gain in AOCI to be Released into Earnings Year Two	37,084
Net Deferred Hedge Gain in AOCI to be Released into Earnings Year Three	33,191
Net Deferred Hedge Gain in AOCI to be Released into Earnings Year Four	13,476
Net Deferred Hedge Gain in AOCI to be Released into Earnings Year Five	12,531
Net Deferred Hedge Gain in AOCI to be Released into Earnings Thereafter	41,443
Net Deferred Hedge Gain in AOCI to be Released into Earnings	$152,979

Property_Plant_And_Equipment_N

Property, Plant And Equipment (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

UNITED STATES

UNITED STATES

UNITED STATES

UNITED STATES

CANADA

CANADA

CANADA

CANADA

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Impairment of Oil and Gas Properties

$0

$551,132,000

[1]

$0

$2,068,787,000

[1]

$479,905,000

$1,042,700,000

$178,000,000

$1,700,682,000

$66,282,000

$157,000,000

$139,900,000

$363,160,000

Other Asset Impairment Charges

'

$4,900,000

'

'

'

'

'

'

'

'

'

'

[1]

Note 1 contains additional information

Property_Plant_And_Equipment_S

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]	'	'
Subject to depletion	$5,630,152	$5,770,913
Unevaluated costs	291,147	307,267
Net oil and gas properties	629,684	780,960
Pipelines and processing facilities	358,186	375,248
General properties	79,619	75,147
Accumulated depletion	-5,291,615	-5,297,220
Accumulated depreciation	-204,557	-202,297
Net other property and equipment	233,248	248,098
Property, plant and equipment, net of accumulated depletion and depreciation	$862,932	$1,029,058

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

2 Months Ended

3 Months Ended

2 Months Ended

3 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

6 Months Ended

9 Months Ended

6 Months Ended

9 Months Ended

Jun. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Aug. 21, 2013

Jun. 30, 2013

Jun. 30, 2013

Aug. 21, 2013

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Combined Credit Agreements [Member]

Combined Credit Agreements [Member]

Canadian Credit Facility [Member]

Senior Notes Due 2019 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2021 [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2015 [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Secured Second Lien Credit Facility [Member]

Combined Credit Agreements [Member]

Global Letter Of Credit [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Multiple Subsidiaries Set Two [Member]

Alternative Base Rate [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

Libor [Member]

Libor [Member]

Libor [Member]

Libor [Member]

Rate

Rate

Rate

U.S. Credit Facility [Member]

Combined Credit Agreements [Member]

U.S. Credit Facility [Member]

Senior Secured Second Lien Credit Facility [Member]

U.S. Credit Facility [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Secured Second Lien Credit Facility [Member]

Maximum [Member]

Minimum [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of ownership interest

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

65.00%

'

'

'

'

'

'

'

Borrowing capacity

'

'

'

'

'

$350,000,000

$850,000,000

'

'

'

'

'

'

'

'

'

'

'

$280,000,000

'

'

'

'

'

'

'

'

'

'

'

Permitted second lien debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

825,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Covenant, Maximum Global Borrowing Base

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

'

'

'

'

'

'

'

Available borrowing under combined credit agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

157,800,000

'

'

'

'

'

'

'

'

'

'

'

'

Commitment fee percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

'

1.75%

0.50%

'

'

'

'

'

'

'

'

'

Senior secured debt leverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

Increase Decrease In Applicable Margin On Loans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.75%

'

'

'

'

'

'

'

'

'

'

'

'

EBITDA to interest expense

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.25

'

'

'

'

'

'

'

'

Minimum mortgage properties requirement

'

'

'

'

80.00%

'

'

'

'

'

'

'

'

'

'

'

'

87.50%

'

'

'

'

'

'

'

'

'

'

'

'

Premium and Tender Premium Paid

51,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments of Financing Costs

'

23,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Issuance Cost

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

590,600,000

325,000,000

'

'

438,000,000

200,000,000

625,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Long-term Debt

'

'

1,308,382,000

111,115,000

'

'

'

'

'

654,400,000

'

'

450,700,000

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Issue Percentage

'

'

'

'

'

'

'

'

'

'

'

94.93%

'

'

'

97.00%

97.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of debt

'

'

1,173,306,000

367,646,000

'

'

'

'

'

'

'

308,500,000

'

'

'

194,000,000

606,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.75%

'

'

'

4.75%

1.00%

5.75%

5.75%

'

3.75%

2.75%

Floor on Debt Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.25%

'

'

1.25%

1.25%

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

'

11.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long Term Debt Repurchase Price

'

'

'

'

'

'

'

'

'

'

1,068

'

'

'

1,027.90

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Paid on Repurchased Debt

'

'

'

'

'

'

'

'

'

'

55.49

'

'

'

32.08

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Repurchase Amount

'

'

'

'

'

'

'

'

'

'

1,000

'

'

'

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount Tendered

'

'

'

'

'

'

'

'

'

'

582,500,000

'

'

'

425,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consent Fee

'

'

'

'

'

'

'

'

$11,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Schedule_Of_Long

Long-Term Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Long-term Debt	$1,920,873	$2,046,418
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	5,294	16,788
Long-term Debt, Current Maturities	0	0
Long-term Debt, Excluding Current Maturities	1,926,167	2,063,206
Combined Credit Agreements [Member]	'	'
Debt Instrument [Line Items]	'	'
Line of Credit Facility, Amount Outstanding	149,736	388,150
Senior Secured Second Lien Credit Facility [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Long-term Debt, Noncurrent	606,593	0
Senior Secured Second Lien Term Loan Due 2019 [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Long-term Debt, Noncurrent	194,110	0
Senior Notes Due 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	10,466	435,851
Senior Notes Due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	8,032	579,795
Senior Notes Due 2019 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	293,083	292,622
Senior Notes Due 2021 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	308,853	0
Senior Subordinated Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated Long-term Debt, Noncurrent	$350,000	$350,000

LongTerm_Debt_Schedule_Of_Outs

Long-Term Debt (Schedule Of Outstanding Debt) (Details) (USD $)

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

In Millions, unless otherwise specified

Combined Credit Agreements [Member]

Combined Credit Agreements [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2019 [Member]

Canadian Credit Facility [Member]

Multiple Subsidiaries Set One [Member]

Multiple Subsidiaries Set Two [Member]

Maximum [Member]

First Mortgage [Member]

Second Lien Debt [Member]

Second Lien Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Subordinated Notes [Member]

Libor [Member]

Libor [Member]

Libor [Member]

Libor [Member]

ABR [Member]

CDOR Rate [Member]

CDOR Rate [Member]

LIBOR [Member]

Canadian Prime Rate [Member]

Canadian Prime Rate [Member]

U.S. Prime Rate [Member]

U.S. Prime Rate [Member]

2013 [Member]

2013 [Member]

2013 [Member]

2014 [Member]

2014 [Member]

2014 [Member]

2014 [Member]

2014 [Member]

2014 [Member]

2015 [Member]

2015 [Member]

2015 [Member]

2015 [Member]

2016 [Member]

2017 [Member]

2019 [Member]

2020 [Member]

U.S. Credit Facility [Member]

U.S. Credit Facility [Member]

U.S. Credit Facility [Member]

Combined Credit Agreements [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2019 [Member]

Senior Notes Due 2021 [Member]

Maximum [Member]

Minimum [Member]

Second Lien Debt [Member]

Second Lien Debt [Member]

Second Lien Debt [Member]

Maximum [Member]

Minimum [Member]

U.S. Credit Facility [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Subordinated Notes [Member]

Second Lien Debt [Member]

Second Lien Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Subordinated Notes [Member]

Second Lien Debt [Member]

Second Lien Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Secured Second Lien Credit Facility [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Canadian Credit Facility [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2016 [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Notes Due 2015 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2019 [Member]

Senior Secured Second Lien Credit Facility [Member]

Senior Secured Second Lien Term Loan Due 2019 [Member]

Senior Notes Due 2016 [Member]

Senior Notes Due 2019 [Member]

Senior Notes Due 2019 [Member]

Senior Notes Due 2019 [Member]

Senior Notes Due 2021 [Member]

Senior Notes Due 2021 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument Year Of Maturity

'

'

'

'2015

'2016

'2019

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Current Borrowing Capacity

$350

$850

'

'

'

'

'

'

'

'

$350

[1],[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal amount

'

'

'

'

'

'

'

'

'

'

'

625

[2]

200

[2]

11

8

298

325

350

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Scheduled maturity date

'

'

'

'

'

'

'

'

'

'

6-Sep-16

[2],[3]

21-Jun-19

[2],[3]

21-Jun-19

[2],[3]

1-Aug-15

1-Jan-16

15-Aug-19

1-Jul-21

1-Apr-16

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

4.00%

[4]

7.00%

[2]

7.00%

[2]

8.25%

11.75%

9.13%

11.00%

7.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Base Interest Rate Options

'

'

'

'

'

'

'

'

'

'

'LIBOR, ABR, CDOR

[2],[5],[6]

'LIBOR floor of 1.25%; ABR floor of 2.25%

[2]

'LIBOR floor of 1.25%

[2]

'N/A

'N/A

'N/A

'N/A

'N/A

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financial covenants

'

'

'

'

'

'

'

'

'

'

'- Minimum current ratio of 1.0 - Minimum EBITDA to cash interest expense ratio of 1.25 - Maximum senior secured debt leverage ratio of 2.0

[2],[7]

'N/A

[2],[7]

'N/A

[2],[7]

'N/A

[7]

'N/A

[7]

'N/A

[7]

'N/A

[7]

'N/A

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Significant restrictive covenants

'

'

'

'

'

'

'

'

'

'

'- Incurrence of debt - Incurrence of liens - Payment of dividends - Equity purchases - Asset sales - Affiliate transactions - Limitations on derivatives and investments

[2],[7]

'- Incurrence of debt - Incurrence of liens and 1st lien cap -Payment of dividends - Equity purchases - Asset sales - Affiliate transactions

[2],[7]

'- Incurrence of debt - Incurrence of liens and 1st lien cap -Payment of dividends - Equity purchases - Asset sales - Affiliate transactions

[2],[7]

'- Asset sales

[7]

'- Asset sales

[7]

'- Incurrence of debt - Incurrence of liens -Payment of dividends - Equity purchases - Asset sales - Affiliate transactions

[7]

'- Incurrence of debt - Incurrence of liens -Payment of dividends - Equity purchases - Asset sales - Affiliate transactions

[7]

'- Incurrence of debt - Incurrence of liens -Payment of dividends - Equity purchases - Asset sales - Affiliate transactions

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Optional redemption

'

'

'

'

'

'

'

'

'

'

'Any time

[2],[7]

'Any time, subject to re-pricing event June 21, 2014: 102 2015: 101

[2],[7]

'Any time, subject to re-pricing event June 21, 2014: 102 2015: 101

[2],[7]

'August 1, 2013: 101.938 2014: par

[7]

'July 1, 2013: 105.875 2014: 102.938 2015: par

[7]

'August 15, 2014: 104.563 2015: 103.042 2016: 101.521 2017: par

[7]

'July 1, 2019: 102.000 2020: par

[7]

'April 1, 2013: 101.188 2014: par

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Make-whole redemption

'

'

'

'

'

'

'

'

'

'

'N/A

[2],[7]

'N/A

[2],[7]

'N/A

[2],[7]

'N/A

[7]

'N/A

[7]

'Callable prior to August 15, 2014 at make-whole call price of Treasury +50 bps

[7]

'Callable prior to July 1, 2019 at make-whole call price of Treasury +50 bps

[7]

'N/A

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Make-whole redemption

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Change of control

'

'

'

'

'

'

'

'

'

'

'Event of default

[2],[7]

'Put at 101% of principal plus accrued interest

[2],[7]

'Put at 101% of principal plus accrued interest

[2],[7]

'Put at 101% of principal plus accrued interest

[7]

'Put at 101% of principal plus accrued interest

[7]

'Put at 101% of principal plus accrued interest

[7]

'Put at 101% of principal plus accrued interest

[7]

'Put at 101% of principal plus accrued interest

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Clawback

'

'

'

'

'

'

'

'

'

'

'N/A

[2],[7]

'N/A

[2],[7]

'N/A

[2],[7]

'N/A

[7]

'N/A

[7]

'N/A

[7]

'Redeemable until July 1, 2016 at 111.00%, plus accrued interest for up to 35%

[7]

'N/A

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Clawback

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

111.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated fair value

'

'

'

'

'

'

'

'

'

'

149.7

600

192

10.1

8.3

271.6

307.1

332.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity interests

'

'

'

'

'

'

100.00%

100.00%

65.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Agreement Repayment Term Trigerring Event, Maximum Threshold For Measurement

$100

'

$100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Commitment fee percentage

'

'

'

'

'

'

'

'

'

1.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current ratio

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum EBITDA to cash interest expense ratio

'

'

'

'

'

'

'

'

'

'

1.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior secured debt leverage ratio

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption percentage of par value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

101.94%

105.88%

101.19%

102.00%

102.00%

100.00%

102.94%

104.56%

100.00%

101.00%

101.00%

100.00%

103.04%

101.52%

100.00%

102.00%

100.00%

Debt Instrument, Reference Rate, Floor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.25%

1.25%

2.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Applicable margin in addition to interest rate

'

'

'

'

'

'

'

'

'

2.75%

'

'

'

'

'

'

'

'

3.75%

2.75%

'

'

'

3.75%

2.75%

1.00%

2.75%

1.75%

2.75%

1.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of principal plus accrued interest for change of control

'

'

'

'

'

'

'

'

'

'

'

101.00%

101.00%

101.00%

101.00%

101.00%

101.00%

101.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

The principal amount for the Combined Credit Agreements represents the global borrowing base as of SeptemberB 30, 2013.

[2]

Borrowings under the Amended and Restated U.S. Credit Facility, Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are guaranteed by certain of Quicksilverbs domestic subsidiaries and are secured (on a first priority basis with respect to the Amended and Restated U.S. Credit Facility and on a second priority basis with respect to the Senior Secured Second Lien Credit Agreement and the Senior Secured Second Lien Notes due 2019) by 100% of the equity interests of each of Cowtown Pipeline Management, Inc., Cowtown Pipeline Funding, Inc., Cowtown Gas Processing L.P., Cowtown Pipeline L.P., Barnett Shale Operating LLC, Silver Stream Pipeline Company LLC, QPP Parent LLC and QPP Holdings LLC (collectively, the bDomestic Pledged Equityb), 65% of the equity interests of Quicksilver Resources Canada Inc. (bQuicksilver Canadab) and Quicksilver Production Partners Operating Ltd. (with respect to the Amended and Restated U.S. Credit Facility, on a ratable basis with borrowings under the Amended and Restated Canadian Credit Facility) and the majority of Quicksilver's domestic proved oil and gas properties and related assets, (the bDomestic Pledged Propertyb).B Borrowings under the Amended and Restated Canadian Credit Facility are guaranteed by Quicksilver and certain of its domestic subsidiaries and are secured by the Domestic Pledged Equity, the Domestic Pledged Property, 100% of the equity interests of Quicksilver Canada (65% of which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and any Canadian restricted subsidiaries, under the Amended and Restated Canadian Credit Facility, and 65% of the equity interests of Quicksilver Production Partners Operating Ltd. (which is on a ratable basis with the borrowings under the Amended and Restated U.S. Credit Facility) and the majority of Quicksilver Canada's oil and gas properties and related assets. The other debt presented is based upon structural seniority and priority of payment.

[3]

The Combined Credit Agreements are required to be repaid 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes, the 2016 Senior Subordinated Notes, the Senior Secured Second Lien Credit Agreement or the Senior Secured Second Lien Notes due 2019, if on the applicable date any amount of such debt remains outstanding. The Senior Secured Second Lien Credit Agreement and Senior Secured Second Lien Notes due 2019 are required to be repaid (1) 91 days prior to the maturity of the 2019 Senior Notes if more than $100 million of the 2019 Senior Notes remain outstanding and (2) 91 days prior to the maturity of the 2015 Senior Notes, the 2016 Senior Notes or the 2016 Senior Subordinated Notes if on the applicable date the aggregate amount of all such notes remaining outstanding is greater than $100 million.

[4]

Represents the weighted average borrowing rate payable to lenders.

[5]

mounts outstanding under the Amended and Restated Canadian Credit Facility bear interest, at our election, at (i)B the CDOR Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii)B the Canadian Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75%, (iii)B the U.S. Prime Rate (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 1.75% and 2.75% and (iv)B adjusted LIBOR (as defined in the Amended and Restated Canadian Credit Facility) plus an applicable margin between 2.75% and 3.75%. We pay a per annum fee on the LC Exposure (as defined in the Amended and Restated Canadian Credit Facility) of all letters of credit issued under the Amended and Restated Canadian Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated Canadian Credit Facility of 0.50%.

[6]

mounts outstanding under the Amended and Restated U.S. Credit Facility bear interest, at our election, at (i) adjusted LIBOR (as defined in the Amended and Restated U.S. Credit Facility) plus an applicable margin between 2.75% and 3.75%, (ii)B ABR (as defined in the Amended and Restated U.S. Credit Facility), which is the greatest of (a)B the prime rate announced by JPMorgan, (b)B the federal funds rate plus 0.50% and (c)B adjusted LIBOR for an interest period of one month plus 1.00%, plus, in each case under scenario (ii), an applicable margin between 1.75% and 2.75%. We also pay a per annum fee on the LC Exposure (as defined in the Amended and Restated U.S. Credit Facility) of all letters of credit issued under the Amended and Restated U.S. Credit Facility equal to the applicable margin, with respect to Eurodollar loans, and a commitment fee on the unused availability under the Amended and Restated U.S. Credit Facility of 0.50%.

[7]

The information presented in this table is qualified in all respects by reference to the full text of the covenants, provisions and related definitions contained in the documents governing the various components of our debt.

LongTerm_Debt_LongTerm_Debt_Mi

Long-Term Debt Long-Term Debt (Minimum Required Interest Coverage Ratio) (Details) (Minimum [Member], Combined Credit Agreements [Member])	9 Months Ended
	Sep. 30, 2013
Q3 2013 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.25
Q4 2013 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.25
Q1 2014 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.2
Q2 2014 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.15
Q3 2014 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.1
Q4 2014 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.1
Q1 2015 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.1
Q2 2015 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.15
Q3 2015 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.15
Q4 2015 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.2
Q1 2016 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	1.5
Q2 2016 [Member]	'
Debt Instrument [Line Items]	'
Interest coverage ratio	2

Asset_Retirement_Obligations_E

Asset Retirement Obligations (Estimated Asset Retirement Obligation Activity) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Asset Retirement Obligation [Abstract]	'	'
Beginning asset retirement obligations	$116,526	'
Additional liability incurred	3,193	'
Change in estimates	586	'
Accretion expense	3,917	'
Asset retirement costs incurred	-1,539	'
Settlement of liability in excess of obligation recorded	867	'
Disposition	-21,910	'
Currency translation adjustment	-1,903	'
Ending asset retirement obligations	99,737	'
Less current portion	577	'
Long-term asset retirement obligation	$99,160	$115,949

Income_Taxes_Valuation_Allowan

Income Taxes Valuation Allowance (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
UNITED STATES	'
Valuation Allowance [Line Items]	'
Tax Valuation Allowance Expense, Federal	$445.90
CANADA	'
Valuation Allowance [Line Items]	'
Tax Valuation Allowance Expense, Federal	$64.40

Commitments_And_Contingencies_

Commitments And Contingencies (Details)	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013
	USD ($)	CAD	USD ($)	NGTL [Member]	Tarrant County, Texas [Member]	Subsequent Event [Member]
				USD ($)	wells	Tarrant County, Texas [Member]
					acre	USD ($)
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$2,200,000	'	'	'	'	'
Litigation settlement	'	'	'	'	'	400,000
Accounts payable	12,745,000	'	37,131,000	12,800,000	'	'
Line of Credit Facility, Letters of Credit, Increase, Additional Borrowings	'	13,000,000	'	'	'	'
Line of Credit Facility, Letters of Credit, Decrease, Additional Borrowings	$14,000,000	'	'	'	'	'
Wells	'	'	'	'	16	'
Tract	'	'	'	'	158.75	'

Fortune_Creek_Details

Fortune Creek (Details) (KKR [Member])	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
	USD ($)	CAD
	Y
Minimum Expenditures Required to Acquire Productive Assets	$300	'
Minimum capital expenditures	170.9	'
Expenditures Required to Acquire Productive Assets Within the Next Twelve Months	9.1	'
Expenditures Required to Acquire Productive Assets That Could Be Deferred Past 2014	20	'
Dedicated years for gas production	10	10
Payments to acquire interest in joint venture	125	'
Percentage of interest by parent in the partnership	50.00%	50.00%
Maximum construction project contributions	'	130

Quicksilver_Stockholders_Equit2

Quicksilver Stockholders' Equity (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended			9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
					Restricted Stock [Member]	Restricted Stock [Member]	Stock Option [Member]	Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'
Common stock, shares authorized	400,000,000	'	'	400,000,000	'	'	'	'
Shares of common stock outstanding	177,100,000	'	'	173,100,000	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	12,000,000	'	'	'	'	'	'	'
Common stock, par value	$0.01	'	'	$0.01	'	'	'	'
Preferred stock, shares authorized	10,000,000	'	'	10,000,000	'	'	'	'
Preferred stock, shares outstanding	0	'	'	0	'	'	'	'
Preferred stock, par value	$0.01	'	'	$0.01	'	'	'	'
Options issued, fair value	'	'	'	'	'	'	$1.60	'
Total intrinsic values of options	'	'	'	'	'	'	6,400,000	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	'	'	'	'	15.6	'	2.7	'
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition	'	'	'	'	'March 2016	'	'June 2015	'
Estimated grant date fair value	'	'	'	'	20.9	'	'	'
Fair value of RSUs settled in cash	'	'	'	'	3.1	'	'	'
Allocated Share-based Compensation Expense	'	'	'	'	12.2	11.9	3.2	5.9
Total fair value of shares vested	'	'	'	'	$5.60	'	'	'
Common stock, shares issued	183,685,021	'	'	179,015,118	'	'	'	'
Treasury stock, shares	6,545,651	'	'	5,921,102	'	'	'	'
Immaterial Error Correction	'	'3600	'2200	'	'	'	'	'

Quicksilver_Stockholders_Equit3

Quicksilver Stockholders' Equity (Assumptions For The Black-Scholes Option Pricing Model For Stock Options Issued) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]	'	'
Weighted avg grant date fair value	$1.05	$4.21
Weighted avg risk-free interest rate	1.31%	1.14%
Expected life (in years)	'4 years 11 months 9 days	'6 years
Wtd avg volatility	68.97%	68.20%
Expected dividends	0.00%	0.00%

Quicksilver_Stockholders_Equit4

Quicksilver Stockholders' Equity (Stock Option Activity) (Details) (Stock Options [Member], USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013
Stock Options [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding at beginning of period, Shares	4,979,980
Granted, Shares	2,037,467
Expired, Shares	-151,867
Outstanding at end of period, Shares	6,865,580
Outstanding at beginning of period, Wtd Avg Exercise Price	$10.23
Exercisable at end of period, Shares	4,670,679
Granted, Wtd Avg Exercise Price	$1.95
Expired, Wtd Avg Exercise Price	$7.76
Outstanding at end of period, Wtd Avg Exercise Price	$7.83
Exercisable at end of period, Wtd Avg Exercise Price	$9.28
Outstanding at end of period, Wtd Avg Remaining Contractual Life, Years	'7 years 1 month 9 days
Exercisable at end of period, Wtd Avg Remaining Contractual Life, Years	'6 years 2 months 19 days
Outstanding at end of period, Aggregate Intrinsic Value	$0
Exercisable at end of period, Aggregate Intrinsic Value	$0

Quicksilver_Stockholders_Equit5

Quicksilver Stockholders' Equity (Restricted Stock And Stock Unit Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Payable In Shares [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding at beginning of period, Shares	3,099,135
Granted, Shares	6,102,133
Vested, Shares	-2,018,457
Forfeited, Shares	-1,303,113
Outstanding at end of period, Shares	5,879,698
Outstanding at beginning of period, Wtd Avg Grant Date Fair Value	$8.48
Granted, Wtd Avg Grant Date Fair Value	$2.74
Vested, Wtd Avg Grant Date Fair Value	$7.57
Forfeited, Wtd Avg Grant Date Fair Value	$3.63
Outstanding at end of period, Wtd Avg Grant Date Fair Value	$3.91
Payable In Cash [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding at beginning of period, Shares	678,217
Granted, Shares	1,468,695
Vested, Shares	-284,406
Forfeited, Shares	-298,138
Outstanding at end of period, Shares	1,564,368
Outstanding at beginning of period, Wtd Avg Grant Date Fair Value	$7.71
Granted, Wtd Avg Grant Date Fair Value	$2.83
Vested, Wtd Avg Grant Date Fair Value	$8.51
Forfeited, Wtd Avg Grant Date Fair Value	$3.88
Outstanding at end of period, Wtd Avg Grant Date Fair Value	$3.72

Earnings_Per_Share_Reconciliat

Earnings Per Share (Reconciliation Of Components Used To Compute Basic And Diluted Net Income Per Common Share) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'		'		'		'
Net income (loss) attributable to Quicksilver	$10,577		($790,520)		$193,397		($1,804,107)
Undistributed Earnings Allocated to Participating Securities	-312	[1]	0	[1]	-5,111	[1]	0	[1]
Income (loss) available to shareholders	$10,265		($790,520)		$188,286		($1,804,107)
Weighted Average Number of Shares Outstanding, Basic	171,682,000		170,179,000		171,403,000		170,054,000
Share-based compensation awards	311,000		0		170,000	[2]	0	[2]
Weighted Average Number of Shares Outstanding, Diluted	171,993,000		170,179,000		171,573,000		170,054,000
Earnings (loss) per common share - basic	$0.06		($4.65)	[3]	$1.10		($10.61)	[3]
Earnings (loss) per common share - diluted	$0.06	[2]	($4.65)	[2],[3]	$1.10	[2]	($10.61)	[2],[3]
Stock Options [Member]	'		'		'		'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'		'		'		'
Antidilutive shares excluded from the diluted share calculation	6,200,000		5,000,000		5,500,000		5,000,000
Restricted Stock Units (RSUs) [Member]	'		'		'		'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'		'		'		'
Antidilutive shares excluded from the diluted share calculation	200,000		300,000		200,000		300,000
[1]	Restricted share awards that contain nonforfeitable rights to dividends are participating securities and, therefore, should be included in computing earnings using the two-class method. Participating securities, however, do not participate in undistributed net losses because there is no contractual obligation to do so.
[2]	For the three months ended SeptemberB 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended SeptemberB 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended SeptemberB 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended SeptemberB 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.
[3]	Note 1 contains additional information

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information (Schedule Of Condensed Consolidated Balance Sheets) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	$349,948	$207,513
Property and equipment	862,932	1,029,058
Investment in subsidiaries (equity method)	0	0
Other assets	118,733	145,217
Total assets	1,331,613	1,381,788
Current liabilities	115,658	167,791
Long-term liabilities	2,180,473	2,346,794
Stockholders' equity	-964,518	-1,132,797
Total liabilities and stockholders' equity	1,331,613	1,381,788
Quicksilver Resources Inc. [Member]	'	'
Current assets	315,788	261,130
Property and equipment	457,139	621,073
Investment in subsidiaries (equity method)	-211,041	-191,725
Other assets	476,322	346,972
Total assets	1,038,208	1,037,450
Current liabilities	107,325	255,678
Long-term liabilities	1,895,402	1,914,568
Stockholders' equity	-964,519	-1,132,796
Total liabilities and stockholders' equity	1,038,208	1,037,450
Restricted Guarantor Subsidiaries [Member]	'	'
Current assets	10,016	105,695
Property and equipment	15,757	20,007
Investment in subsidiaries (equity method)	0	0
Other assets	0	0
Total assets	25,773	125,702
Current liabilities	11,802	112,133
Long-term liabilities	19,242	19,242
Stockholders' equity	-5,271	-5,673
Total liabilities and stockholders' equity	25,773	125,702
Restricted Non-Guarantor Subsidiaries [Member]	'	'
Current assets	61,101	76,088
Property and equipment	304,754	296,462
Investment in subsidiaries (equity method)	-33,931	-42,883
Other assets	33,134	41,865
Total assets	365,058	371,532
Current liabilities	35,835	33,475
Long-term liabilities	522,245	524,107
Stockholders' equity	-193,022	-186,050
Total liabilities and stockholders' equity	365,058	371,532
Restricted Subsidiary Eliminations [Member]	'	'
Current assets	-35,986	-222,586
Property and equipment	0	0
Investment in subsidiaries (equity method)	211,041	191,725
Other assets	-390,723	-243,620
Total assets	-215,668	-274,481
Current liabilities	-35,986	-222,586
Long-term liabilities	-390,723	-243,620
Stockholders' equity	211,041	191,725
Total liabilities and stockholders' equity	-215,668	-274,481
Quicksilver And Restricted Subsidiaries [Member]	'	'
Current assets	350,919	220,327
Property and equipment	777,650	937,542
Investment in subsidiaries (equity method)	-33,931	-42,883
Other assets	118,733	145,217
Total assets	1,213,371	1,260,203
Current liabilities	118,976	178,700
Long-term liabilities	2,046,166	2,214,297
Stockholders' equity	-951,771	-1,132,794
Total liabilities and stockholders' equity	1,213,371	1,260,203
Unrestricted Non-Guarantor Subsidiaries [Member]	'	'
Current assets	2,443	13,250
Property and equipment	0	0
Investment in subsidiaries (equity method)	-33,931	-42,905
Other assets	0	0
Total assets	-31,488	-29,655
Current liabilities	2,423	13,230
Long-term liabilities	0	0
Stockholders' equity	-33,911	-42,885
Total liabilities and stockholders' equity	-31,488	-29,655
Fortune Creek [Member]	'	'
Current assets	1,428	391
Property and equipment	85,282	91,516
Investment in subsidiaries (equity method)	0	0
Other assets	0	0
Total assets	86,710	91,907
Current liabilities	-899	2,316
Long-term liabilities	1,575	1,585
Stockholders' equity	86,034	88,006
Total liabilities and stockholders' equity	86,710	91,907
Consolidating Eliminations [Member]	'	'
Current assets	-4,842	-26,455
Property and equipment	0	0
Investment in subsidiaries (equity method)	67,862	85,788
Other assets	0	0
Total assets	63,020	59,333
Current liabilities	-4,842	-26,455
Long-term liabilities	132,732	130,912
Stockholders' equity	-64,870	-45,124
Total liabilities and stockholders' equity	$63,020	$59,333

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Schedule of Condensed Consolidated Statements Of Income (Loss)) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		$0	$1,089
Revenue	153,116	118,188		447,318	485,072
Operating expenses	101,041	694,739		337,391	2,523,717
Crestwood earn-out	'	'		'	41,097
Equity in net earnings of subsidiaries	0	0		0	0
Operating income (loss)	60,049	-576,551		451,073	-1,997,548
Fortune Creek accretion	-4,818	-4,978	[1]	-14,490	-14,549	[1]
Interest expense and other	38,688	42,497		-225,123	-122,585
Income tax (expense) benefit	-5,966	-166,494	[1]	-18,063	330,575	[1]
Net income (loss)	10,577	-790,520		193,397	-1,804,107
Other comprehensive income (loss)	-8,794	-46,615		-38,114	-44,916
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	1,783	-837,135		155,283	-1,849,023
Quicksilver Resources Inc. [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	1,089
Revenue	114,021	108,366		334,848	429,774
Operating expenses	73,594	600,696		256,810	2,082,777
Crestwood earn-out	'	'		'	41,097
Equity in net earnings of subsidiaries	3,854	-71,911		-9,227	-305,205
Operating income (loss)	52,255	-564,241		409,957	-1,917,111
Fortune Creek accretion	0	0		0	0
Interest expense and other	-36,922	-37,964		-200,639	-114,578
Income tax (expense) benefit	-4,756	-188,457		-15,921	227,582
Net income (loss)	10,577	-790,662		193,397	-1,804,107
Other comprehensive income (loss)	-6,114	-40,955		-29,014	-48,694
Equity in OCI of subsidiaries	-2,680	-5,660		-9,100	3,778
Comprehensive income (loss)	1,783	-837,277		155,283	-1,849,023
Restricted Guarantor Subsidiaries [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	0
Revenue	192	1,182		608	3,390
Operating expenses	68	739		206	2,541
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	0	0		0	0
Operating income (loss)	124	443		402	849
Fortune Creek accretion	0	0		0	0
Interest expense and other	0	0		0	0
Income tax (expense) benefit	0	142		0	0
Net income (loss)	124	585		402	849
Other comprehensive income (loss)	0	0		0	0
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	124	585		402	849
Restricted Non-Guarantor Subsidiaries [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	0
Revenue	38,903	9,336		111,862	54,202
Operating expenses	30,360	95,412		89,559	444,621
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	-1,834	-2,269		-5,300	-6,931
Operating income (loss)	6,709	-88,345		17,003	-397,350
Fortune Creek accretion	0	0		0	0
Interest expense and other	-1,769	-4,586		-24,490	-8,060
Income tax (expense) benefit	-1,210	20,577		-2,142	99,356
Net income (loss)	3,730	-72,354		-9,629	-306,054
Other comprehensive income (loss)	-2,680	-5,660		-9,100	3,778
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	1,050	-78,014		-18,729	-302,276
Restricted Subsidiary Eliminations [Member]	'	'		'	'
Revenue	0	-696		0	-2,294
Operating expenses	0	-696		0	-2,294
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	-3,854	71,911		9,227	305,205
Operating income (loss)	-3,854	71,911		9,227	305,205
Fortune Creek accretion	0	0		0	0
Interest expense and other	0	0		0	0
Income tax (expense) benefit	0	0		0	0
Net income (loss)	-3,854	71,911		9,227	305,205
Other comprehensive income (loss)	0	0		0	0
Equity in OCI of subsidiaries	2,680	5,660		9,100	-3,778
Comprehensive income (loss)	-1,174	77,571		18,327	301,427
Quicksilver And Restricted Subsidiaries [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	1,089
Revenue	153,116	118,188		447,318	485,072
Operating expenses	104,022	696,151		346,575	2,527,645
Crestwood earn-out	'	'		'	41,097
Equity in net earnings of subsidiaries	-1,834	-2,269		-5,300	-6,931
Operating income (loss)	55,234	-580,232		436,589	-2,008,407
Fortune Creek accretion	0	0		0	0
Interest expense and other	38,691	42,550		-225,129	-122,638
Income tax (expense) benefit	-5,966	-167,738		-18,063	326,938
Net income (loss)	10,577	-790,520		193,397	-1,804,107
Other comprehensive income (loss)	-8,794	-46,615		-38,114	-44,916
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	1,783	-837,135		155,283	-1,849,023
Unrestricted Non-Guarantor Subsidiaries [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	0
Revenue	0	0		0	0
Operating expenses	0	0		0	0
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	2,984	1,443		9,190	3,959
Operating income (loss)	2,984	1,443		9,190	3,959
Fortune Creek accretion	0	0		0	0
Interest expense and other	0	-22		0	22
Income tax (expense) benefit	0	0		0	0
Net income (loss)	2,984	1,465		9,190	3,981
Other comprehensive income (loss)	0	0		0	0
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	2,984	1,465		9,190	3,981
Fortune Creek [Member]	'	'		'	'
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	'		'	0
Revenue	5,674	4,422		16,736	10,021
Operating expenses	2,693	3,010		7,552	6,093
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	0	0		0	0
Operating income (loss)	2,981	1,412		9,184	3,928
Fortune Creek accretion	0	0		0	0
Interest expense and other	3	-31		6	31
Income tax (expense) benefit	0	0		0	0
Net income (loss)	2,984	1,443		9,190	3,959
Other comprehensive income (loss)	0	0		0	0
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	2,984	1,443		9,190	3,959
Consolidating Eliminations [Member]	'	'		'	'
Revenue	-5,674	-4,422		-16,736	-10,021
Operating expenses	-5,674	-4,422		-16,736	-10,021
Crestwood earn-out	'	'		'	0
Equity in net earnings of subsidiaries	-1,150	826		-3,890	2,972
Operating income (loss)	-1,150	826		-3,890	2,972
Fortune Creek accretion	-4,818	-4,978		-14,490	-14,549
Interest expense and other	0	0		0	0
Income tax (expense) benefit	0	1,244		0	3,637
Net income (loss)	-5,968	-2,908		-18,380	-7,940
Other comprehensive income (loss)	0	0		0	0
Equity in OCI of subsidiaries	0	0		0	0
Comprehensive income (loss)	-5,968	-2,908		-18,380	-7,940
Tokyo Gas [Member]	'	'		'	'
Crestwood earn-out	7,974	0	[1]	341,146	'
Tokyo Gas [Member] | Quicksilver Resources Inc. [Member]	'	'		'	'
Crestwood earn-out	7,974	'		341,146	'
Tokyo Gas [Member] | Restricted Guarantor Subsidiaries [Member]	'	'		'	'
Crestwood earn-out	0	'		0	'
Tokyo Gas [Member] | Restricted Non-Guarantor Subsidiaries [Member]	'	'		'	'
Crestwood earn-out	0	'		0	'
Tokyo Gas [Member] | Restricted Subsidiary Eliminations [Member]	'	'		'	'
Crestwood earn-out	0	'		0	'
Tokyo Gas [Member] | Quicksilver And Restricted Subsidiaries [Member]	'	'		'	'
Crestwood earn-out	7,974	'		341,146	'
Tokyo Gas [Member] | Unrestricted Non-Guarantor Subsidiaries [Member]	'	'		'	'
Crestwood earn-out	0	'		0	'
Tokyo Gas [Member] | Fortune Creek [Member]	'	'		'	'
Crestwood earn-out	0	'		0	'
Tokyo Gas [Member] | Consolidating Eliminations [Member]	'	'		'	'
Crestwood earn-out	$0	'		$0	'
[1]	Note 1 contains additional information

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information (Schedule of Condensed Consolidated Statements of Cash Flows) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	($81,103)	$141,376
Purchases of property, plant and equipment	-78,549	-437,172
Proceeds from Divestiture of Interest in Subs & Affiliates	'	41,097
Proceeds from sale of properties and equipment	2,994	3,843
Payments to acquire marketable securities	-142,823	0
Proceeds from Sale and Maturity of Marketable Securities	13,178	'
Net cash used by investing activities	300,515	-392,232
Issuance of debt	1,173,306	367,646
Repayments of debt	-1,308,382	-111,115
Debt issuance costs	-25,868	-3,048
Intercompany note	0	'
Distribution of Fortune Creek Partnership funds	-8,079	-6,520
Proceeds from exercise of stock options	0	-11
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	-1,089
Purchase of treasury stock	-1,472	-2,810
Net cash flow provided (used) by financing activities	-170,495	245,253
Effect of exchange rates on cash	2,610	-107
Net increase (decrease) in cash and equivalents	51,527	-5,710
Cash and cash equivalents at beginning of period	4,951	13,146
Cash and cash equivalents at end of period	56,478	7,436
Quicksilver Resources Inc. [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	-113,029	74,952
Purchases of property, plant and equipment	-53,291	-199,136
Proceeds from Divestiture of Interest in Subs & Affiliates	'	41,097
Proceeds from sale of properties and equipment	2,977	3,489
Payments to acquire marketable securities	-142,823	'
Proceeds from Sale and Maturity of Marketable Securities	13,178	'
Net cash used by investing activities	325,756	-154,550
Issuance of debt	1,170,266	177,500
Repayments of debt	-1,157,969	-98,018
Debt issuance costs	-25,868	-1,998
Intercompany note	-147,103	'
Distribution of Fortune Creek Partnership funds	0	0
Proceeds from exercise of stock options	'	-11
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	-1,089
Purchase of treasury stock	-1,472	-2,810
Net cash flow provided (used) by financing activities	-162,146	75,774
Effect of exchange rates on cash	0	0
Net increase (decrease) in cash and equivalents	50,581	-3,824
Cash and cash equivalents at beginning of period	4,618	363
Cash and cash equivalents at end of period	55,199	-3,461
Restricted Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	-19	655
Purchases of property, plant and equipment	19	-655
Proceeds from Divestiture of Interest in Subs & Affiliates	'	0
Proceeds from sale of properties and equipment	0	0
Payments to acquire marketable securities	0	'
Proceeds from Sale and Maturity of Marketable Securities	0	'
Net cash used by investing activities	19	-655
Issuance of debt	0	0
Repayments of debt	0	0
Debt issuance costs	0	0
Intercompany note	0	'
Distribution of Fortune Creek Partnership funds	0	0
Proceeds from exercise of stock options	'	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	0
Purchase of treasury stock	0	0
Net cash flow provided (used) by financing activities	0	0
Effect of exchange rates on cash	0	0
Net increase (decrease) in cash and equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Restricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	25,517	48,301
Purchases of property, plant and equipment	-24,752	-227,509
Proceeds from Divestiture of Interest in Subs & Affiliates	'	0
Proceeds from sale of properties and equipment	17	354
Payments to acquire marketable securities	0	'
Proceeds from Sale and Maturity of Marketable Securities	0	'
Net cash used by investing activities	-24,735	-227,155
Issuance of debt	3,040	190,146
Repayments of debt	-150,413	-13,097
Debt issuance costs	0	-1,050
Intercompany note	147,103	'
Distribution of Fortune Creek Partnership funds	0	0
Proceeds from exercise of stock options	'	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	0
Purchase of treasury stock	0	0
Net cash flow provided (used) by financing activities	-270	175,999
Effect of exchange rates on cash	-512	2,855
Net increase (decrease) in cash and equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Quicksilver And Restricted Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	-87,531	123,908
Purchases of property, plant and equipment	-78,024	-427,300
Proceeds from Divestiture of Interest in Subs & Affiliates	'	41,097
Proceeds from sale of properties and equipment	2,994	3,843
Payments to acquire marketable securities	-142,823	'
Proceeds from Sale and Maturity of Marketable Securities	13,178	'
Net cash used by investing activities	301,040	-382,360
Issuance of debt	1,173,306	367,646
Repayments of debt	-1,308,382	-111,115
Debt issuance costs	-25,868	-3,048
Intercompany note	0	'
Distribution of Fortune Creek Partnership funds	0	0
Proceeds from exercise of stock options	'	-11
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	-1,089
Purchase of treasury stock	-1,472	-2,810
Net cash flow provided (used) by financing activities	-162,416	251,773
Effect of exchange rates on cash	-512	2,855
Net increase (decrease) in cash and equivalents	50,581	-3,824
Cash and cash equivalents at beginning of period	4,618	363
Cash and cash equivalents at end of period	55,199	-3,461
Unrestricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	0	0
Purchases of property, plant and equipment	0	0
Proceeds from Divestiture of Interest in Subs & Affiliates	'	0
Proceeds from sale of properties and equipment	0	0
Payments to acquire marketable securities	0	'
Proceeds from Sale and Maturity of Marketable Securities	0	'
Net cash used by investing activities	0	0
Issuance of debt	0	0
Repayments of debt	0	0
Debt issuance costs	0	0
Intercompany note	0	'
Distribution of Fortune Creek Partnership funds	0	0
Proceeds from exercise of stock options	'	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	0
Purchase of treasury stock	0	0
Net cash flow provided (used) by financing activities	0	0
Effect of exchange rates on cash	0	0
Net increase (decrease) in cash and equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Fortune Creek [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Net cash flow provided (used) by operating activities	6,428	17,468
Purchases of property, plant and equipment	-525	-9,872
Proceeds from Divestiture of Interest in Subs & Affiliates	'	0
Proceeds from sale of properties and equipment	0	0
Payments to acquire marketable securities	0	'
Proceeds from Sale and Maturity of Marketable Securities	0	'
Net cash used by investing activities	-525	-9,872
Issuance of debt	0	0
Repayments of debt	0	0
Debt issuance costs	0	0
Intercompany note	0	'
Distribution of Fortune Creek Partnership funds	-8,079	-6,520
Proceeds from exercise of stock options	'	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	'	0
Purchase of treasury stock	0	0
Net cash flow provided (used) by financing activities	-8,079	-6,520
Effect of exchange rates on cash	3,122	-2,962
Net increase (decrease) in cash and equivalents	946	-1,886
Cash and cash equivalents at beginning of period	333	12,783
Cash and cash equivalents at end of period	1,279	10,897
Tokyo Gas [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	463,418	0
Tokyo Gas [Member] | Quicksilver Resources Inc. [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	463,418	'
Tokyo Gas [Member] | Restricted Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Tokyo Gas [Member] | Restricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Tokyo Gas [Member] | Quicksilver And Restricted Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	463,418	'
Tokyo Gas [Member] | Unrestricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Tokyo Gas [Member] | Fortune Creek [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Synergy [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	42,297	0
Synergy [Member] | Quicksilver Resources Inc. [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	42,297	'
Synergy [Member] | Restricted Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Synergy [Member] | Restricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Synergy [Member] | Quicksilver And Restricted Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	42,297	'
Synergy [Member] | Unrestricted Non-Guarantor Subsidiaries [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	0	'
Synergy [Member] | Fortune Creek [Member]	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Proceeds from Divestiture of Interest in Subs & Affiliates	$0	'

Segment_Information_Operating_

Segment Information (Operating Income And Property And Equipment Costs Incurred) (Details) (USD $)	3 Months Ended					9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012		Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Number of geographical segments	'	'		'	'	'	'		2
Revenue	$153,116	$118,188		'	'	$447,318	$485,072		'
Depletion, depreciation and accretion	14,390	34,014	[1]	'	'	47,911	136,469	[1]	'
Depletion, depreciation and accretion	'	'		'	'	47,911	136,469		'
Impairment expense	0	551,132	[1]	'	'	0	2,068,787	[1]	'
Operating income (loss)	60,049	-576,551		'	'	451,073	-1,997,548		'
Property and equipment costs incurred	20,721	67,765		'	'	72,455	359,029		'
Property, plant and equipment - net	862,932	'		'	'	862,932	'		1,029,058
Total assets	1,331,613	'		'	'	1,331,613	'		1,381,788
UNITED STATES	'	'		'	'	'	'		'
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Revenue	114,002	108,365		'	'	334,804	429,776		'
Depletion, depreciation and accretion	8,402	23,205		'	'	29,745	101,432		'
Impairment expense	'	479,905		1,042,700	178,000	'	1,700,682		'
Operating income (loss)	56,911	-476,542		'	'	456,624	-1,559,594		'
Property and equipment costs incurred	15,147	43,722		'	'	50,459	160,699		'
Property, plant and equipment - net	452,023	'		'	'	452,023	'		614,071
Total assets	847,466	'		'	'	847,466	'		784,104
CANADA	'	'		'	'	'	'		'
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Revenue	38,407	8,859		'	'	110,052	52,249		'
Depletion, depreciation and accretion	4,114	8,938		'	'	12,458	29,454		'
Impairment expense	'	66,282		157,000	139,900	'	363,160		'
Operating income (loss)	11,076	-82,528		'	'	30,126	-382,194		'
Property and equipment costs incurred	4,288	21,382		'	'	9,972	178,783		'
Property, plant and equipment - net	303,265	'		'	'	303,265	'		294,921
Total assets	365,058	'		'	'	365,058	'		371,532
Midstream [Member]	'	'		'	'	'	'		'
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Revenue	6,381	6,082		'	'	19,198	15,363		'
Depletion, depreciation and accretion	1,300	1,281		'	'	3,947	3,810		'
Impairment expense	'	4,945		'	'	'	4,945		'
Operating income (loss)	3,107	443		'	'	9,593	849		'
Property and equipment costs incurred	1,615	1,824		'	'	2,369	13,263		'
Property, plant and equipment - net	101,038	'		'	'	101,038	'		111,523
Total assets	112,483	'		'	'	112,483	'		217,609
Corporate [Member]	'	'		'	'	'	'		'
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Revenue	0	0		'	'	0	0		'
Depletion, depreciation and accretion	574	590		'	'	1,761	1,773		'
Impairment expense	'	0		'	'	'	0		'
Operating income (loss)	-11,045	-17,924		'	'	-45,270	-56,609		'
Property and equipment costs incurred	-329	837		'	'	9,655	6,284		'
Property, plant and equipment - net	6,606	'		'	'	6,606	'		8,543
Total assets	6,606	'		'	'	6,606	'		8,543
Elimination [Member]	'	'		'	'	'	'		'
Segment Reporting Information [Line Items]	'	'		'	'	'	'		'
Revenue	-5,674	-5,118		'	'	-16,736	-12,316		'
Depletion, depreciation and accretion	0	0		'	'	0	0		'
Impairment expense	'	0		'	'	'	0		'
Operating income (loss)	0	0		'	'	0	0		'
Property and equipment costs incurred	0	0		'	'	0	0		'
Property, plant and equipment - net	0	'		'	'	0	'		0
Total assets	$0	'		'	'	$0	'		$0
[1]	Note 1 contains additional information

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Cash Paid Or Received For Interest And Income Taxes) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]	'	'
Interest, net of capitalized interest	$227,189	$141,811
Income taxes	$1,217	($1,528)

Supplemental_Cash_Flow_Informa3

Supplemental Cash Flow Information (Other Significant Noncash Transactions) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]	'	'
Capital Expenditures Incurred but Not yet Paid	$4,867	$37,386

Transactions_With_Related_Part1

Transactions With Related Parties (Details) (USD $)	9 Months Ended			1 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	31-May-13	31-May-13	31-May-13	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
	Mercury Exploration Company [Member]	Mercury Exploration Company [Member]	Darden Family [Member]	Thomas F. Darden [Member]	Restricted Stock [Member]	Stock Options [Member]	Use Of Airplane [Member]	Use Of Airplane [Member]	Commissions Paid [Member]
					Thomas F. Darden [Member]	Thomas F. Darden [Member]	Darden Family [Member]	Darden Family [Member]	Darden Family [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'
Revenue from Related Parties	$100,000	$100,000	'	'	'	'	'	'	'
Percentage of ownership interest	'	'	30.00%	'	'	'	'	'	'
Payments to related parties	'	'	'	'	'	'	300,000	400,000	200,000
Monthly business expense allowance	'	'	'	12,500	'	'	'	'	'
Cash bonus related to Tokyo Gas Transaction	'	'	'	1,100,000	'	'	'	'	'
Options issued, fair value	'	'	'	1,100,000	'	'	'	'	'
Unvested equity awards	'	'	'	'	242,724	304,407	'	'	'
Legal fee reimbursement allowance	'	'	'	40,000	'	'	'	'	'
Monthly consulting fee	'	'	'	45,000	'	'	'	'	'
Maximum bonus eligibility	'	'	'	$2,500,000	'	'	'	'	'