Endeavour International 10-Q 11 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document And Entity Information [Abstract]
Document type	10-Q
Document period end date	31-Mar-15
Amendment flag	FALSE
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2015
Current fiscal year end date	-19
Entity central index key	1112412
Entity filer category	Accelerated Filer
Entity registrant name	Endeavour International Corporation
Entity Common Stock, Shares Outstanding		52,800,000

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$66,498	$81,850
Accounts receivable	34,270	35,507
Prepaid expenses and other current assets	36,821	47,397
Total Current Assets	137,589	164,754
Property and Equipment, Net ($11,466 and $10,784 not subject to amortization at March 31, 2015 and December 31, 2014 respectively)	343,735	469,509
Restricted Cash, Long-Term Portion	95,356	100,241
Other Assets	73	72
Total Assets	576,753	734,576
Current Liabilities:
Accounts payable	32,697	27,364
Current maturities of debt	433,141	432,181
Deferred revenue	594	14,157
Asset retirement obligations, current portion	29,835	40,547
Accrued expenses and other	5,332	15,196
Total Current Liabilities	501,599	529,445
Deferred Taxes	39,118	56,670
Other Liabilities	64,496	66,077
Total Liabilities Not Subject to Compromise	605,213	652,192
Liabilities Subject to Compromise	840,900	841,044
Total Liabilities	1,446,113	1,493,236
Commitments and Contingencies
Series C Convertible Preferred Stock:
Series C preferred stock - Liquidation preference: $14,800 and $14,800 at March 31, 2015 and December 31, 2014, respectively	17,481	17,481
Stockholders Equity (Deficit):
Common stock; shares issued and outstanding - 52,834 and 52,900 shares at March 31, 2015 and December 31, 2014, respectively	53	53
Additional paid-in capital	557,072	557,111
Treasury stock, at cost - 72 and 72 shares at March 31, 2015 and December 31, 2014, respectively	-587	-587
Accumulated deficit	-1,443,379	-1,332,718
Total Stockholders' Equity (Deficit)	-886,841	-776,141
Total Liabilities and Stockholders' Equity	576,753	734,576
Series C Preferred Stock [Member]
Series C Convertible Preferred Stock:
Series C preferred stock - Liquidation preference: $14,800 and $14,800 at March 31, 2015 and December 31, 2014, respectively	17,481	17,481
Series B Preferred Stock [Member]
Stockholders Equity (Deficit):
Series B preferred stock - Liquidation preference: $1,971 and $1,971 at March 31, 2015 and December 31, 2014, respectively

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parentheticals) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Property and equipment not subject to amortization	$11,466	$10,784
Common stock shares issued	52,834,000	52,900,000
Common stock shares outstanding	52,834,000	52,900,000
Treasury Stock	72,000	72,000
Series C Preferred Stock [Member]
Preferred stock liquidation preference	14,800	14,800
Series B Preferred Stock [Member]
Preferred stock liquidation preference	$1,971	$1,971

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements Of Operations
Revenues	$64,329	$94,163
Cost of Operations:
Operating expenses	24,145	27,170
Depreciation, depletion and amortization	56,561	44,968
Impairment of oil and gas properties	90,087
Insurance proceeds	-8,425
General and administrative	2,572	4,849
Total Expenses	164,940	76,987
Income (Loss) From Operations	-100,611	17,176
Other Income (Expense):
Unrealized gains on derivatives		2,659
Interest expense	-14,351	-31,477
Letter of credit fees	-58	-3,789
Financing and transaction costs	-1,025	-1,816
Loss on early extinguishment of financing agreements		-3,543
Litigation settlement expense		-19,034
Reorganization items	-6,866
Unrealized gain (loss) on foreign currency exchange	4	-1,273
Other income (expense)	105	-204
Total Other Expense	-22,191	-58,477
Loss Before Income Taxes	-122,802	-41,301
Petroleum Revenue Tax Expense (Benefit)	-12,141	1,725
Corporate Tax Expense		1,844
Total Tax Expense (Benefit)	-12,141	3,569
Net Loss	-110,661	-44,870
Preferred Stock Dividends		456
Net Loss to Common Stockholders	($110,661)	($45,326)
Net Loss per Common Share:
Basic and Diluted	($2.10)	($0.91)
Weighted Average Number of Common Shares Outstanding:
Basic and Diluted	52,763	49,590

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net loss	($110,661)	($44,870)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	56,561	44,968
Impairment of oil and gas properties	90,087
Deferred tax expense (benefit)	-11,137	1,969
Unrealized gains on derivatives		-2,659
Amortization of non-cash compensation	-10	971
Amortization of loan costs and discount	2,238	6,705
Non-cash interest expense		1,883
Loss on early extinguishment of financing agreements		6,856
Non-cash litigation settlement expense		19,034
Other	-5,017	1,847
Changes in operating assets and liabilities:
Decrease in receivables	1,237	19,001
(Increase) decrease in other current assets	2,624	-5,056
Decrease in liabilities	-23,058	-23,100
Net Cash Provided by Operating Activities	2,864	27,549
Cash Flows From Investing Activities:
Capital expenditures	-23,101	-28,845
Proceeds from sale of oil and gas interests		1,352
(Increase) decrease in restricted cash	4,885	-2,457
Net Cash Used in Investing Activities	-18,216	-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-115,163
Borrowings under debt agreements, net of debt discount		140,625
Proceeds from issuance of common stock		12,376
Repayments of Monetary Production Payments		-5,000
Financing costs paid		-9,273
Other financing		-416
Net Cash Provided by (Used in) Financing Activities		23,149
Net Increase (Decrease) in Cash and Cash Equivalents	-15,352	20,748
Cash and Cash Equivalents, Beginning of Period	81,850	34,742
Cash and Cash Equivalents, End of Period	$66,498	$55,490

General

General	3 Months Ended
	Mar. 31, 2015
General, Debtors Condensed Combined Financial Statements And Guarantor Subsidiaries [Abstract]
General	Note 1 – General
	Description of Business
	Endeavour International Corporation is an independent oil and gas company engaged in the exploration, development, production and acquisition of energy reserves in the U.S. and U.K.  Endeavour was incorporated under the laws of the state of Nevada on January 13, 2000.  As used in these Notes to Condensed Consolidated Financial Statements, the terms “Endeavour,” “Company,” “we,” “us,” “our” and similar terms refer to Endeavour International Corporation and, unless the context indicates otherwise, its consolidated subsidiaries.  The accompanying financial statements should be read in conjunction with the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2014.
	Bankruptcy Cases
	On October 10, 2014, (the “Petition Date”), Endeavour and certain of its wholly owned U.S. subsidiaries - Endeavour Operating Corporation, Endeavour Colorado Corporation, Endeavour Energy New Ventures Inc., and END Management Company - and one of its foreign subsidiaries - Endeavour Energy Luxembourg S.à.r.l. (collectively, the “Debtors”) - filed voluntary petitions under Chapter 11 of the United States Bankruptcy Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”).  The Chapter 11 cases are being jointly administered by the Bankruptcy Court as Case No. 14-12308 (the “Bankruptcy Cases”).  See Note 3 – Voluntary Reorganization Under Chapter 11 for a discussion of the Bankruptcy Cases.
	Going Concern
	Our accompanying condensed consolidated financial statements were prepared assuming that we will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business for the twelve month period following the date of these condensed consolidated financial statements.  However, as a result of our Bankruptcy Cases and other matters described herein, including the termination of the Restructuring Support Agreement (“RSA”) on April 29, 2015 (see Note 3 - Voluntary Reorganization under Chapter 11) and the potential breach of our leverage covenant under our Amended Term Loan Facility applicable to our U.K. subsidiary in or about the third quarter of 2015 (see Note 3 – Voluntary Reorganization Under Chapter 11 and Note 8 – Debt Obligations), there is substantial doubt about our ability to continue as a going concern.
	We continue to have discussions with certain of our creditors and their advisors and the advisors to the Official Committee of Unsecured Creditors appointed by the Bankruptcy Court concerning the impact of the price declines that began in late 2014.  Additionally, we have and continue to engage in discussions with certain of our U.S. and U.K. creditors regarding the possibility of raising new capital to reduce the principal amount of outstanding indebtedness under the Amended Term Loan Facility in an amount adequate to avoid a potential default of the leverage covenant, refinancing all or a portion of the Amended Term Loan Facility, or obtaining a waiver or amendment from the lenders under the Amended Term Loan Facility prior to any default thereunder.
	During the pendency of the Bankruptcy Cases, we expect that our primary sources of liquidity will continue to be cash on hand and cash flows from operations.  In addition, the negative covenants under the Amended Term Loan Facility restrict us from obtaining additional capital, including limits on intercompany transfers.
	Our ability to continue as a going concern is dependent on many factors, including, among other things: (i) the cost, duration and outcome of the Bankruptcy Cases; (ii) our ability to maintain adequate cash on hand and generate cash from operations; (iii) our ability to maintain compliance with debt covenant requirements of the Amended Term Loan Facility; and (iv) our ability to achieve profitability following a restructuring.  The accompanying condensed consolidated financial statements do not include any adjustments that might be necessary if our actions to address these factors are not successful.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	Note 2 – Summary of Significant Accounting Policies
	Basis of Presentation and Use of Estimates
	The accompanying unaudited condensed consolidated financial statements have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and have been presented on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business.  The accompanying financial statements do not include any adjustments to reflect the possible future effects on the recoverability of assets or the amounts of liabilities that may result from the outcome of this uncertainty.  See Note 1 – General – Going Concern.
	In the opinion of management, all normal recurring adjustments considered necessary for a fair presentation have been included in these financial statements.  Certain amounts for prior periods have been reclassified to conform to the current presentation.
	U.S. GAAP requires management to use estimates, judgments and assumptions that affect the amounts of assets, liabilities, revenues and expenses reported herein.  While management regularly reviews its estimates, actual results could differ from those estimates.
	Management believes that it is reasonably possible that the following material estimates affecting the financial statements could change in the current year:
		·	estimates of proved oil and gas reserves;
		·	estimates as to the expected future cash flow from proved oil and gas properties; and
		·	estimates of future dismantlement and restoration costs.
	Recent Accounting Pronouncements
	In March 2015, the Financial Accounting Standards Board (FASB) issued an update to the accounting standards to simplify the presentation of debt issuance costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.  The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update.  The guidance is effective for interim periods and annual period beginning after December 15, 2015; however early adoption is permitted.  We are currently evaluating the effect that adopting this guidance will have on our financial position, results of operations or cash flows.
	In May 2014, the FASB issued a new standard on revenue recognition.  The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized.  The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The new standard is effective for annual periods beginning after December 31, 2016 and can be adopted either retrospectively to each reporting period or retrospectively with a cumulative-effect adjustment as of the date of adoption.  In April 2015, the FASB proposed to delay the effective date one year, effective for annual periods beginning after December 31, 2017. The proposal will be subject to the FASB’s due process requirement, which includes a period for public comments. We are currently evaluating the effect that adopting this guidance will have on our financial position, results of operations or cash flows.

Voluntary_Reorganization_Under

Voluntary Reorganization Under Chapter 11	3 Months Ended
	Mar. 31, 2015
Voluntary Reorganization Under Chapter 11 [Abstract]
Voluntary Reorganization Under Chapter 11	Note 3 –  Voluntary Reorganization Under Chapter 11
	Background
	On September 2, 2014, the Company announced that it had decided not to pay approximately $33.5 million in interest due on September 2, 2014 on its 12% First Priority Notes due March 2018 (“First Priority Notes”), 12% Second Priority Notes due June 2018 (“Second Priority Notes”) and 6.5% Convertible Senior Notes due November 2017 (“6.5% Convertible Senior Notes”).
	On October 10, 2014, the Company announced that it reached agreements with holders of more than two-thirds of its First Priority Notes, Second Priority Notes and 7.5% Convertible Bonds (see Note 8 – Debt Obligations) and its 6.5% Convertible Senior Notes and 5.5% Convertible Senior Notes (see Note 8 – Debt Obligations and collectively, “Consenting Debt Holders”), in the form of a consensual Restructuring Support Agreement (“RSA”) that, if implemented as proposed, would significantly reduce the Company’s outstanding debt.  The RSA contemplated that the recapitalization of the Company would occur pursuant to a pre-arranged plan of reorganization.  On the Petition Date, the Debtors filed voluntary petitions under Chapter 11 of the Bankruptcy Code in the Bankruptcy Court.  Since the Petition Date, the Debtors have operated their business as “debtors-in-possession" pursuant to Sections 1107(a) and 1108 of the Bankruptcy Code, which will allow the Company to continue operations and carry on the business in the ordinary course of business during the reorganization proceedings.  Each Debtor will remain in possession of its assets and properties, and its business and affairs will continue to be managed by its directors and officers, subject in each case to the supervision of the Bankruptcy Court.
	On the Petition Date, the Company sought, and thereafter obtained, authority to take a broad range of actions, including, among others, authority to pay royalty interests and joint interest billings, certain employee obligations and pre-Petition contractor claims and taxes.  Additionally, other orders were obtained, including adequate assurance of payment to utility companies as well as continued use of cash management systems.
	None of the Company’s subsidiaries incorporated in the U.K. has filed under Chapter 11.  Such non-filing subsidiaries are referred to herein as “non-Debtors.”
	Termination of RSA and Sale of U.S. Assets
	On April 29, 2015, the Debtors terminated the RSA and filed a notice with the Bankruptcy Court to withdraw its proposed plan or reorganization that had been filed to implement the terms of the RSA (the “Plan”).  We have determined that as a result of the recent decline in commodity prices, the Plan was not feasible and, accordingly, we will not continue to seek its confirmation.  Even if the Plan were to be confirmed, if oil and gas prices remain at their depressed levels, we could breach our leverage covenant under our Amended Term Loan Facility applicable to our U.K. subsidiary in or about the third quarter of 2015, which would result in a default under the terms of the Amended Term Loan Facility and a liquidity shortfall at the end of the fourth quarter of 2015.
	We have and continue to engage in discussions with certain of our U.S. and U.K. creditors regarding the possibility of executing a new RSA, raising new capital to reduce the principal amount of outstanding indebtedness under the Amended Term Loan Facility in an amount adequate to avoid a potential default of the leverage covenant, refinancing all or a portion of the Amended Term Loan Facility, or obtaining a waiver or amendment from the lenders under the Amended Term Loan Facility prior to any default thereunder, or other agreed terms to sustain a restructuring and avoid default.
	There can be no assurance that a reduction, refinancing, waiver or amendment of the Amended Term Loan Facility could be accomplished.  If we are not able to reach a satisfactory agreement with certain of our U.S. and U.K. creditors and are unable to refinance the Amended Term Loan Facility, which is not possible without financial support from certain of our U.S. or U.K. creditors, we may be compelled, either voluntarily or involuntarily, into liquidation of our U.K. operations through an administration proceeding in the U.K., in addition to any Chapter 11 or Chapter 7 liquidation proceeding in the U.S.
	On April 29, 2015, in light of the foregoing, the Company also filed with the Bankruptcy Court a motion to, among other things, approve the sale of substantially all of the Company’s U.S. assets and, in connection with such sale, establish bidding procedures and an auction.  Certain non-Debtors are also exploring restructuring alternatives, including preparing for the commencement of a separate marketing process in the U.K. for the sale of substantially all their U.K.-based oil and gas assets.

Debtors_Condensed_Combined_Fin

Debtors Condensed Combined Financial Statements	3 Months Ended
	Mar. 31, 2015
Debtors Condensed Combined Financial Statements	Note 16 – Guarantor Subsidiaries
	Certain of our wholly-owned domestic subsidiaries have, jointly and severally, fully and unconditionally guaranteed the 2018 Notes.  Pursuant to Securities and Exchange Commission (“SEC”) regulations, we have presented in columnar format the condensed consolidating financial information for Endeavour International Corporation, the guarantor subsidiaries on a combined basis, and all non-guarantor subsidiaries on a combined basis.
	The subsidiary guarantees are unsecured obligations of each subsidiary guarantor and rank equally in right of payment with all senior indebtedness of that subsidiary guarantor and senior in right of payment to all subordinated indebtedness of that subsidiary guarantor.  The subsidiary guarantees are effectively subordinated to any secured indebtedness of the subsidiary guarantor with respect to the assets securing the indebtedness.  In addition, the subsidiary guarantees may be released in certain customary circumstances, including (i) the sale of all or substantially all of the properties or assets or a guarantor, (ii) the sale of the capital stock of a guarantor, (iii) the designation of a guarantor as an “Unrestricted Subsidiary,” (iv) upon legal defeasance of the 2018 Notes or satisfaction and discharge of the indentures governing the 2018 Notes, (v) upon the liquidation or dissolution of the guarantor or (vi) if the guarantor ceases to guarantee other of our indebtedness and ceases to be a material subsidiary, each of which is subject to important limitations in the indentures governing the 2018 Notes.
	During 2014, we executed an intercompany loan agreement, effective May 2012, between Endeavour International Corporation and one of its wholly-owned subsidiaries that is a guarantor of the 2018 Notes.  As the intercompany loan is effective for prior periods, the revisions for this loan and related interest to the applicable prior periods are reflected in the financial information herein.  The intercompany loan has no effect on our condensed consolidated results of operations or financial statements of position.
	Condensed consolidating financial statements for our guarantor subsidiaries and non-guarantor subsidiaries are presented in the following tables:
	As of March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	17,515		$	48,983		$	-	$	66,498
	Accounts receivable		-			2,187			32,083			-		34,270
	Current receivables due from affiliates		494,133			68,055			100,272			-662,460		-
	Prepaid expenses and other		-			5,881			30,940			-		36,821
	Current Assets		494,133			93,638			212,278			-662,460		137,589
	Property, plant and equipment, net		-			30,077			313,658			-		343,735
	Restricted cash, long-term portion		-			-			95,356			-		95,356
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			11			62			-		73
	Total Assets	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	Accounts payable	$	-		$	2,833		$	29,864		$	-	$	32,697
	Current maturities of debt		-			-			433,141			-		433,141
	Deferred revenue		-			-			594			-		594
	Current liabilities due to affiliates		648			594,376			67,436			-662,460		-
	Asset retirement obligations, current portion		-			41			29,794			-		29,835
	Accrued expenses and other		621			3,946			765			-		5,332
	Current Liabilities		1,269			601,196			561,594			-662,460		501,599
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			39,118			-		39,118
	Other liabilities		-3			449			64,050			-		64,496
	Total Liabilities Not Subject to Compromise		1,266			1,155,645			1,164,762			-1,716,460		605,213
	Liabilities Subject to Compromise		751,221			5,933			83,746			-		840,900
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		335,827			-318,794			-627,154			-276,720		-886,841
	Total Liabilities and Equity	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	As of December 31, 2014
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	32,055		$	49,795		$	-	$	81,850
	Accounts receivable		-			2,427			33,080			-		35,507
	Current receivables due from affiliates		477,351			53,174			104,085			-634,610		-
	Prepaid expenses and other		-			7,350			40,047			-		47,397
	Current Assets		477,351			95,006			227,007			-634,610		164,754
	Property, plant and equipment, net		-			35,529			433,980			-		469,509
	Restricted cash, long term portion		-			-			100,241			-		100,241
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			10			62			-		72
	Total Assets	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	Accounts payable	$	-		$	2,065		$	25,299		$	-	$	27,364
	Current maturities of debt		-			-			432,181			-		432,181
	Deferred revenue		-			-			14,157			-		14,157
	Current liabilities due to affiliates		648			581,402			52,560			-634,610		-
	Asset retirement obligations, current portion		-			42			40,505			-		40,547
	Accrued expenses and other		385			5,663			9,148			-		15,196
	Current Liabilities		1,033			589,172			573,850			-634,610		529,445
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			56,670			-		56,670
	Other liabilities		1			436			65,640					66,077
	Total Liabilities Not Subject to Compromise		1,034			1,143,608			1,196,160			-1,688,610		652,192
	Liabilities Subject to Compromise		751,219			6,079			83,746			-		841,044
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		319,279			-300,084			-518,616			-276,720		-776,141
	Total Liabilities and Equity	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	For the Three Months Ended March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Revenue	$	-		$	1,083		$	63,246		$	-	$	64,329
Operating expenses		-			1,289			22,856			-		24,145
DD&A expense		-			562			55,999			-		56,561
Impairment of oil and gas properties		-			10,078			80,009			-		90,087
Insurance proceeds		-			-			-8,425			-		-8,425
G&A expenses		33			-649			3,188			-		2,572
Loss from Operations		-33			-10,197			-90,381			-		-100,611
Other Income (Expense):
Interest expense		-			-16,620			-29,351			31,620		-14,351
Letter of credit fees		-			-			-58			-		-58
Financing and transaction costs		-			-45			-980			-		-1,025
Reorganization items		-			-6,866			-			-		-6,866
Unrealized foreign currency gains (losses)		-			-			4			-		4
Other income (expense)		16,620			15,018			87			-31,620		105
Income (loss) before income taxes		16,587			-18,710			-120,679			-		-122,802
Petroleum Revenue Tax ("PRT") Benefit		-			-			-12,141			-		-12,141
Corporate Tax Benefit		-			-			-			-		-
Total tax benefit		-			-			-12,141			-		-12,141
Net income (loss)		16,587			-18,710			-108,538			-		-110,661
Preferred stock dividends		-			-			-			-		-
Net income (loss) to common shareholders	$	16,587		$	-18,710		$	-108,538		$	-	$	-110,661
For the Three Months Ended March 31, 2014
	Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
Revenue	$	-		$	1,947		$	92,216		$	-	$	94,163
Operating expenses		-			1,181			25,989			-		27,170
DD&A expense		-			721			44,247			-		44,968
G&A expenses		995			3,709			145			-		4,849
Income (loss) from Operations		-995			-3,664			21,835			-		17,176
Other Income (Expense):
Unrealized gains on derivatives		469			-			2,190			-		2,659
Interest expense		-20,620			-16,042			-26,435			31,620		-31,477
Letter of credit fees		-			-			-3,789			-		-3,789
Financing and transaction costs		-323			-590			-903					-1,816
Loss on early extinguishment of financing		-			-			-3,543			-		-3,543
agreements
Litigation settlement expense		-			-19,034			-			-		-19,034
Unrealized foreign currency gains (losses)		-			-			-1,273			-		-1,273
Other income (expense)		16,621			14,996			-201			-31,620		-204
Loss before income taxes		-4,848			-24,334			-12,119			-		-41,301
Petroleum Revenue Tax ("PRT") Expense		-			-			1,725			-		1,725
Corporate Tax Expense		-			-			1,844			-		1,844
Total tax expense		-			-			3,569			-		3,569
Net loss		-4,848			-24,334			-15,688			-		-44,870
Preferred stock dividends		456			-			-			-		456
Net loss to common shareholders	$	-5,304		$	-24,334		$	-15,688		$	-	$	-45,326
For the Three Months Ended March 31, 2015
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	16,587	$	-18,710	$	-108,538	$	-	$	-110,661
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		562		55,999		-		56,561
Impairment of oil and gas properties		-		10,078		80,009		-		90,087
Deferred tax expense (benefit)		-		-		-11,137		-		-11,137
Amortization of non-cash compensation		-		-		-		-10		-10
Amortization of loan costs and discount		-		-		2,238		-		2,238
Other		-39		6,338		-11,316		-		-5,017
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		240		997		-		1,237
(Increase) decrease in other current assets		-		-17,219		19,843		-		2,624
Increase (decrease) in liabilities		236		-7,399		-15,895		-		-23,058
Net Cash Provided by (Used in)
Operating Activities		16,784		-26,110		12,200		-10		2,864
Cash Flows From Investing Activities:
Capital expenditures		-		-5,826		-17,897		622		-23,101
Increase in restricted cash		-		-		4,885		-		4,885
Net Cash Used in Investing Activities		-		-5,826		-13,012		622		-18,216
Cash Flows From Financing Activities:
Intercompany cash management		-16,784		17,396		-		-612		-
Other financing		-		-		-		-		-
Net Cash Provided by (Used in)
Financing Activities		-16,784		17,396		-		-612		-
Net Change in Cash and Cash Equivalents		-		-14,540		-812		-		-15,352
Cash and Cash Equivalents, Beginning
of Period		-		32,055		49,795		-		81,850
Cash and Cash Equivalents, End of Period	$	-	$	17,515	$	48,983	$	-	$	66,498
For the Three Months Ended March 31, 2014
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-4,848	$	-24,334	$	-15,688	$	-	$	-44,870
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		721		44,247		-		44,968
Deferred tax expense (benefit)		-		-		1,969		-		1,969
Unrealized (gains) losses on derivatives		-469		-		-2,190		-		-2,659
Amortization of non-cash compensation		162		-		-		809		971
Amortization of loan costs and discount		2,049		-		4,656		-		6,705
Non-cash interest expense		-		-		1,883		-		1,883
Litigation settlement expense		-		19,034		-		-		19,034
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Other		-		-4		1,851		-		1,847
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		-852		19,853		-		19,001
(Increase) decrease in other current assets		-		-238		-4,818		-		-5,056
Increase (decrease) in liabilities		-17,438		20,381		-23,658		-2,385		-23,100
Net Cash Provided by (Used in)
Operating Activities		-20,544		14,708		34,961		-1,576		27,549
Cash Flows From Investing Activities:
Capital expenditures		-		-15,328		-15,093		1,576		-28,845
Proceeds from sales, net of cash		-		1,352		-		-		1,352
Increase in restricted cash		-		-		-2,457		-		-2,457
Net Cash Used in Investing Activities		-		-13,976		-17,550		1,576		-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-		-		-115,163		-		-115,163
Borrowings under debt agreements, net
of debt discount		17,500		-		123,125		-		140,625
Proceeds from issuance of common stock		12,376		-		-		-		12,376
Repayments of MPP		-		-		-5,000		-		-5,000
Intercompany cash management		-8,460		25,604		-17,144		-		-
Financing costs paid		-456		-		-8,817		-		-9,273
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		20,544		25,604		-22,999		-		23,149
Net Change in Cash and Cash Equivalents		-		26,336		-5,588		-		20,748
Cash and Cash Equivalents, Beginning
of Period		-		2,417		32,325		-		34,742
Cash and Cash Equivalents, End of Period	$	-	$	28,753	$	26,737	$	-	$	55,490
Debtors [Member]
Debtors Condensed Combined Financial Statements	Note 4 – Debtors Condensed Combined Financial Statements
	Condensed combined financial statements of the Debtors are set forth below.  The Condensed Combined Financial Statements exclude the financial statements of the non-Debtors.  Transactions and balances of receivables and payables between Debtors are eliminated in consolidation.  However, the Condensed Combined Balance Sheet includes receivables from related non-Debtors and payables to related non-Debtors.  Actual settlement of these related party receivables and payables is, by historical practice, made on a net basis or through an equity contribution.
	Condensed Combined Balance Sheet
	As of March 31, 2015
	Assets:
	Current Assets	$	25,592
	Property and Equipment, Net ($11,466 not subject to amortization)		30,077
	Long-Term Receivables Due from Affiliates (1)		648,801
	Investments in Subsidiaries		295,816
	Other Assets		9
	Total Assets	$	1,000,295
	Liabilities Not Subject to Compromise:
	Accrued expenses and other	$	7,495
	Current Liabilities Due to Affiliates (1)		101,386
	Other		630
	Liabilities Subject to Compromise (2)		840,900
	Series C Convertible Preferred Stock - Liquidation Preference: $14,800		17,481
	Stockholders' Equity (3)		32,403
	Total Liabilities and Stockholders’ Equity	$	1,000,295
		-1		It is expected that upon consummation of the Bankruptcy Cases, all intercompany receivables and payables will be offset and settled through equity contributions.  No allowances for intercompany receivables from the Debtors have been recorded in the condensed combined financial statements.
		-2		See Note 5 – Liabilities Subject to Compromise
		-3		It is expected that upon consummation of the Bankruptcy Cases, all common stock of the Debtors will be cancelled and new common stock will be issued to partially satisfy the bankruptcy claims.
	Condensed Combined Statement of Operations
	Three Months Ended March 31, 2015
	Revenues	$	1,082
	Cost of Operations		11,314
	Loss from Operations		-10,232
	Other Income (Expense):
	Interest income		15,000
	Financing and transaction costs		-58
	Reorganization items (4)		-6,866
	Other expense		26
	Total Other Income		8,102
	Net Loss		-2,130
		-4		See Note 5 – Liabilities Subject to Compromise for additional discussion of Reorganization items.
	Condensed Combined Cash Flow
	Three Months Ended March 31, 2015
	Net cash provided by (used in):
	Operating	$	36,603
	Investing		-52,784
	Financing		16
	Net decrease in cash and cash equivalents		-16,165
	Cash and Cash Equivalents, Beginning of Period		131,656
	Cash and Cash Equivalents, End of Period	$	115,491

Liabilities_Subject_To_Comprom

Liabilities Subject To Compromise	3 Months Ended
	Mar. 31, 2015
Liabilities Subject To Compromise [Abstract]
Liabilities Subject To Compromise	Note 5 –  Liabilities Subject to Compromise
	Liabilities Subject to Compromise represents liabilities incurred prior to the Petition Date which may be affected by the Chapter 11 process.  These amounts represent the Debtors’ allowed claims and their best estimate of claims expected to be allowed which will be resolved as part of the bankruptcy proceedings.
	Liabilities Subject to Compromise consists of the following as of March 31, 2015:
	Accounts Payable	$	5,935
	Debt		790,246
	Accrued Interest and Dividends		44,719
	Total Liabilities Subject to Compromise	$	840,900
	Interest Expense
	The Debtors have discontinued recording interest expense on unsecured or under-secured liabilities subject to compromise on the Petition Date.  Contractual interest not accrued during the first quarter of 2015 was approximately $21.4 million.
	Reorganization Items
	Reorganization items represent the direct and incremental costs of being in bankruptcy, such as professional fees, pre-petition liability claim adjustments and losses related to terminated contracts that are probable and can be estimated.  Reorganization fees for the quarter ended March 31, 2015 related solely to professional fees.

Property_And_Equipment

Property And Equipment	3 Months Ended
	Mar. 31, 2015
Property And Equipment [Abstract]
Property And Equipment	Note 6 –  Property and Equipment
	Property and equipment included the following at the dates indicated below:
			March 31,		December 31,
			2015		2014
	Oil and Gas Properties Under the Full Cost Method:
	Subject to Amortization	$	916,437	$	989,758
	Not Subject to Amortization:
	Incurred in 2015		682		-
	Incurred in 2014		945		945
	Incurred in 2013		774		774
	Incurred prior to 2013		9,065		9,065
			927,903		1,000,542
	Computers, Furniture and Fixtures		8,733		8,733
	Total Property and Equipment		936,636		1,009,275
	Accumulated Depreciation, Depletion and Amortization		-592,901		-539,766
	Net Property and Equipment	$	343,735	$	469,509
	As of March 31, 2015 and December 31, 2014, our properties not subject to amortization balance of $11.5 million and $10.8 million relate to unevaluated well costs in the Marcellus.  These costs will be transferred to the amortization base when it is determined whether or not proved reserves can be assigned to such properties.  This analysis is dependent upon well performance, drilling results and development of identified projects and periodic assessment of reserves.  We expect costs excluded from amortization to be transferred to the amortization base over the next year as previously drilled wells in the U.S. are completed and tied into infrastructure.  We have no unevaluated costs in the U.K.
	For the three months ended March 31, 2015 and 2014, we capitalized none and $2.6 million, respectively, in interest related to exploration and development, primarily related to our U.K. activities.    For the three months ended March 31, 2015 and 2014, we capitalized $2.4 million and $3.1 million, respectively, in certain directly related employee costs.
	Oil and Gas Impairments
	During the first quarter of 2015, we recorded $90.1 million in impairment of oil and gas properties, pre-tax, through the application of the full cost ceiling test.  The primary reason for the impairment was the precipitous fall in oil and gas pricing which began during the fourth quarter of 2014 and which has not yet recovered.  The pricing used for the U.K. for the first quarter of 2015 was $83.49 per barrel for oil and $7.60 per mcf for gas.  The pricing used for the U.S. for the first quarter of 2015 was $78.58 per barrel for oil and $3.73 per mcf for gas.  Should oil and gas prices remain depressed for the remainder of 2015, further impairments of our oil and gas properties are likely to be recorded throughout 2015.
	We did not have an impairment of U.S. oil and gas properties through the application of the full cost ceiling test for the first quarter of 2014, which utilized prices of $98.43 per barrel for oil and $3.99 per mcf for gas. Additionally, we did not have an impairment of U.K. oil and gas properties through the application of the full cost ceiling test for the first quarter of 2014, which utilized prices of $107.06 per barrel for oil and $10.57 per mcf for gas.
	Insurance Settlements
	We have made an insurance claim to recover certain loss of production and replacement costs related to our insurance claim for the loss of production income resulting from the rupture of the Alba water injection pipeline, and received $13.0 million during the fourth quarter of 2014 and $8.4 million during the first quarter of 2015 as preliminary settlements.  The entirety of the amount received during the first quarter of 2015 relates to loss of production.  The claims remain in progress for potential additional recoveries, which are expected to be in the range of $5 million to $7 million.

Deferred_Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2015
Deferred Revenue [Abstract]
Deferred Revenue	Note 7 – Deferred Revenue
	For certain of our U.K. fields, we sell production on a monthly basis; however, the production remains in the field’s storage tanks.  The inventory associated with these sales remains on our balance sheet and the revenue is deferred until the production is shipped out of our storage tanks.
	At March 31, 2015, our deferred revenue was entirely attributable to our Alba field.  Delivery of the production is expected to occur during the second quarter of 2015.

Debt_Obligations

Debt Obligations	3 Months Ended
	Mar. 31, 2015
Debt Obligations [Abstract]
Debt Obligations	Note 8 – Debt Obligations
	At  March 31, 2015, we had $1,230.2 million in outstanding debt.  Our debt consisted of the following at March 31, 2015 and December 31, 2014:
			March 31,			December 31,
			2015			2014
	Liabilities Subject to Compromise: (1)
	Senior Notes, 12% Fixed Rate, Due 2018	$	554,000		$	554,000
	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016		135,000			135,000
	Convertible Bonds, 11.5% Until March 31, 2014 and 7.5% Thereafter,		83,746			83,746
	due 2016
	Convertible Senior Notes, 6.5% Fixed Rate, Due 2017		17,500			17,500
	Total Liabilities Subject to Compromise		790,246			790,246
	Liabilities Not Subject to Compromise:
	Amended Term Loan Facility, Variable Rate, Due 2017		440,000			440,000
	Total Debt Obligations		1,230,246			1,230,246
	Less:  Debt Discount		-6,859			-7,819
	Less:  Liabilities Subject to Compromise		-790,246			-790,246
	Less:  Current Maturities		-433,141			-432,181
	Long-Term Debt	$	-		$	-
		-1		For discussion of the potential impact of our filing under Chapter 11 of the Bankruptcy Code on our debt obligations, see Note 3 – Voluntary Reorganization under Chapter 11.  As a result of our filing under Chapter 11 of the Bankruptcy Code, we are in default of the debt covenants related to the Senior Notes, 5.5% Convertible Senior Notes, 7.5% Convertible Bonds and 6.5% Convertible Senior Notes.  All outstanding balances related to these obligations have been reclassified as Liabilities Subject to Compromise in our Condensed Consolidated Balance Sheets.
	Liabilities Not Subject to Compromise
	Amended Term Loan Facility
	On September 30, 2014, two wholly-owned subsidiaries, Endeavour International Holding B.V. (“EIH”) and End Finco LLC (“Finco” and collectively, “Borrowers”) entered into an amended and restated credit agreement (the “Amended Credit Agreement”) replacing our previous $125 million senior secured first lien term loan facility originally entered into on January 24, 2014 (the “Term Loan Facility”).  EIH and Finco are non-Debtors, and as such, the Amended Credit Agreement is not subject to the Bankruptcy Cases.  Pursuant to the Amended Credit Agreement, the lenders advanced approximately $440 million in aggregate principal amount of term loans to the Borrowers (“Amended Term Loan Facility”).
	The Amended Term Loan Facility bears interest quarterly at a rate of LIBOR plus 10.00% per year (with a LIBOR floor of 1% per year) and matures on January 2, 2017.  The loans under the Amended Term Loan Facility were issued with original issue discount of 2.0%.  Borrowings under the Amended Term Loan Facility are guaranteed by the Company and certain of its current and future subsidiaries, including Endeavour Operating Corporation and Endeavour Energy UK Limited (“Endeavour UK”), subject to certain exceptions.  The Amended Term Loan Facility is secured by the same assets that previously secured the Company’s Term Loan Facility other than cash and cash equivalents in the United States.
	The Amended Credit Agreement contains covenants and provisions with respect to events of default,  including restrictions on the Company’s and its subsidiaries’ abilities to: (i) pay distributions or repurchase or redeem the Company’s capital stock or subordinated debt; (ii) make certain investments; (iii) incur additional indebtedness; (iv) create or incur certain liens; (v) sell assets; (vi) consolidate, merge or transfer all or substantially all of the Company’s assets; (vii) enter into agreements that restrict distributions from the Company’s subsidiaries to the Company; (viii) engage in transactions with affiliates; and (ix) allow EIH or any of its subsidiaries to make dividends, payments or other distributions of any kind to the Debtors, other than pursuant to specific limited amounts and for specified purposes.
	The Amended Credit Agreement contains customary events of default, subject to certain exceptions.  In particular, the following events do not constitute events of default under the Amended Credit Agreement: (a) payment defaults or other defaults to the Company’s existing notes or to certain intercompany indebtedness or (b) a bankruptcy filing by the Company or its domestic subsidiaries and one foreign subsidiary.
	In addition, the Amended Credit Agreement contains various financial covenants as defined in the agreement, including:
		·		a  maximum leverage ratio of 2.75:1.00 beginning with the fiscal quarter ending December 31, 2014; and
		·		a minimum asset coverage ratio of 1.0 to 1.0 as of June 30 and December 31 of each year.
	If oil and gas prices remain at their depressed levels, we could breach our leverage covenant under our Amended Term Loan Facility in or about the third quarter of 2015, which would result in a default under the terms of the Amended Term Loan Facility and a liquidity shortfall at the end of the fourth quarter of 2015.  Based on this determination, we have classified the outstanding balance of the Amended Term Loan Facility as a current liability in the line item “Current maturities of debt” and the related remaining deferred financing costs as a current asset in our Condensed Consolidated Balance Sheets as of March 31, 2015 and December 31, 2014.
	Liabilities Subject to Compromise
	Senior Notes
	In February 2012, we closed the private placement of $350 million aggregate principal amount of 12% First Priority Notes due 2018 and $150 million aggregate principal amount of 12% Second Priority Notes due 2018 (collectively, the “2018 Notes”).  In October 2012, we completed a private placement of an additional $54 million aggregate principal amount of 12% First Priority Notes due 2018.
	5.5% Convertible Senior Notes
	In July 2011, we issued $135 million aggregate principal amount of our 5.5% Convertible Senior Notes due July 15, 2016.  Interest on these notes is payable semi-annually at a rate of 5.5% per annum.  The 5.5% Convertible Senior Notes are convertible into shares of our common stock at an initial conversion rate of 54.019 shares (equivalent to $18.51 per share) of common stock per $1,000 principal amount of the notes, subject to certain anti-dilution adjustments.
	7.5% Convertible Bonds
	In July 2008, we issued 7.5% Convertible Bonds which bore interest at a rate of 11.5% per annum until March 31, 2014, and at a rate of 7.5% thereafter.  Interest is compounded quarterly and added to the outstanding principal balance each quarter.  The bonds are convertible into shares of our common stock at an initial conversion price of $16.52 per $1,000 of principal, which represents a conversion rate of approximately 61 shares of our common stock per $1,000 of principal.
	6.5% Convertible Senior Notes
	On February 28, 2014, we entered into a securities purchase agreement (the “Securities Purchase Agreement”).  We closed on an initial $30 million during the first quarter of 2014, comprised of 2.9 million shares of our common stock; warrants to purchase 0.7 million shares of our common stock at an exercise price of $5.292 per share, expiring on February 28, 2019; and $17.5 million in aggregate principal amount of our 6.5% Convertible Senior Notes.
	Interest on the 6.5% Convertible Senior Notes is payable quarterly and matures the earlier of (i) December 1, 2017 or (ii) 92 days prior to the maturity date of our outstanding 5.5% Convertible Senior Notes or our 7.5% Convertible Bonds, if still outstanding on that date.
	The 6.5% Convertible Senior Notes are convertible at any time at an initial rate of 214.5002 shares of our common stock per $1,000 principal amount of 6.5% Convertible Notes (equivalent to an initial conversion price of approximately $4.662 per share of our common stock).
	Fair Value
	The fair value of our outstanding debt obligations was $446.7 million and $446.1 million at March 31, 2015 and December 31, 2014, respectively.  The fair value of our Amended Term Loan Facility was determined based upon a discounted cash flow model.  As a result, all fair value measures related to our debt are considered Level 3.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Taxes [Abstract]
Income Taxes	Note 9 – Income Taxes
	Our U.S. operations are taxed at a statutory rate of 35%.  However, we currently do not record tax benefits due to losses in the U.S. as there is no assurance that we will generate any U.S. taxable earnings, resulting in a full valuation allowance of all deferred tax assets generated.
	For years prior to January 1, 2015, our U.K. operations were taxed at a statutory rate of 62% (composed of a Ring Fence Corporation Tax rate of 30% and Supplementary Charge rate of 32%).  In March 2015, the Supplementary Charge rate decreased to 20%, which was retroactive to January 1, 2015, so that for 2015 the statutory rate is 50%.  However, we currently do not record tax benefits due to losses in the U.K. relating to Ring Fence Corporation Tax and Supplemental Charge as there is no assurance that we will generate any U.K. taxable earnings.  As a result, we have a full valuation allowance on the deferred tax assets generated relating to these taxes.
	In addition, certain of our U.K. fields are subject to a Petroleum Revenue Tax (“PRT”) rate of 50%.  Our current tax expense is related to PRT on the Alba field, our only producing field subject to PRT.  In March 2015, tax legislation was enacted that will decrease the PRT rate from 50% to 35% for years beginning on January 1, 2016.
	UK Finance Act 2015
	On March 26, 2015, the Finance Act 2015 received Royal Assent and was enacted by the U.K. government.  The Finance Act 2015 implemented several changes affecting our U.K. activities, including:
		·	a decrease in the Supplementary Charge rate from 32% to 20%, which is retroactive to January 1, 2015; and
		·	a decrease in the PRT rate from 50% to 35%, beginning on January 1, 2016.
	As a result of this enacted legislation, the Company recorded an $11.4 million deferred tax expense related to the decrease in the Supplementary Charge rate change during the first quarter of 2015, exactly offset by a reduction in the U.K. valuation allowance which resulted in a zero net charge to the Condensed Consolidated Statements of Operations for the quarter ended March 31, 2015.
	Furthermore, the Company recorded a deferred PRT tax benefit of $7.9 million during the first quarter of 2015 related to the enacted decrease in the PRT rate for the deferred tax liabilities that will reverse subsequent to the January 1, 2016 effective date.

Other_LongTerm_Liabilities

Other Long-Term Liabilities	3 Months Ended
	Mar. 31, 2015
Other Long-Term Liabilities [Abstract]
Other Long-Term Liabilities	Note 10 – Other Long-Term Liabilities
	At March 31, 2015 and December 31, 2014, our other liabilities included the following:
			March 31,		December 31,
			2015		2014
	Asset Retirement Obligations	$	64,359	$	65,935
	Other		137		142
	Total Other Liabilities	$	64,496	$	66,077
	Asset Retirement Obligations
	Our asset retirement obligations relate to our obligation for the plugging and abandonment of oil and gas properties.  The asset retirement obligations are recorded at fair value and accretion expense, recognized over the life of the property, increases the liability to its expected settlement value.  If the fair value of the estimated asset retirement obligation changes, an adjustment is recorded for both the asset retirement obligation and the asset retirement cost.
	The following table provides a rollforward of our asset retirement obligations for the three months ended March 31, 2015:
			Three Months Ended
			March 31,
			2015
	Carrying amount of asset retirement obligations as of December 31, 2014	$	106,482
	Accretion expense (included in DD&A expense)		3,425
	Impact of foreign currency exchange rate changes		-5,014
	Payment of asset retirement obligations		-10,699
	Liabilities incurred and assumed		-
	Carrying amount of asset retirement obligations, as of end of period		94,194
	Less:  Current portion of asset retirement obligations		-29,835
	Long-term asset retirement obligations	$	64,359

Equity_Transactions

Equity Transactions	3 Months Ended
	Mar. 31, 2015
Equity Transactions [Abstract]
Equity Transactions
	Note 11 – Equity Transactions
	In February 2014, we entered into the Securities Purchase Agreement whereby we issued 2.9 million shares of our common stock and warrants to purchase 0.7 million shares of our common stock for a total of $12.5 million in cash.  The warrants have an exercise price of $5.292 per share and expire on February 28, 2019 and are subject to customary anti-dilution provisions.
	For discussion of the potential impact of our filing under Chapter 11 of the Bankruptcy Code on our equity, see Note 3 – Voluntary Reorganization under Chapter 11.

StockBased_Compensation_Arrang

Stock-Based Compensation Arrangements	3 Months Ended
	Mar. 31, 2015
Stock-Based Compensation Arrangements [Abstract]
Stock-Based Compensation Arrangements	Note 12 – Stock- Based Compensation Arrangements
	We grant restricted stock and stock options to employees and directors as incentive compensation.  The restricted stock and options generally vest over three years.  We have not granted any restricted stock or stock options during 2015.
	Non-cash stock-based compensation is recorded in general and administrative (“G&A”) expenses or capitalized G&A as follows:
			Three Months Ended
			March 31,
		2015			2014
	G&A Expenses	$	-10		$	971
	Capitalized G&A		-29			163
	Total non-cash stock-based compensation	$	-39		$	1,134
	At March 31, 2015, total compensation cost related to awards not yet recognized was approximately $3.4 million and is expected to be recognized over a weighted average period of less than two years.
	Stock Options
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model. Information relating to outstanding stock options is summarized as follows:
		Number of		Weighted		Weighted
		Shares		Average		Average		Aggregate
		Underlying		Exercise Price		Contractual		Intrinsic
		Options		per Share		Life in Years		Value
	Balance outstanding - January 1, 2015	107	$	7.76
	Expired	-87		8.21
	Balance outstanding - March 31, 2015	20	$	5.83		3.4	$	-
	Currently exercisable - March 31, 2015	20	$	5.83		3.4	$	-
	Restricted Stock
	Restricted stock awards are valued based on the closing price of our common stock on the measurement date, which is typically the date of grant.
	The status of the restricted shares outstanding as of March 31, 2015 is presented below:
						Weighted
						Average Grant
			Number of			Date Fair Value
			Shares			per Share
	Balance outstanding - January 1, 2015		740		$	4.93
	Vested		-245			5.90
	Forfeited		-27			5.69
	Balance outstanding - March 31, 2015		468		$	4.40
	Total grant date fair value of shares vesting during the period	$	38.3
	Performance-Based Share Awards
	Certain of our executive officers were granted a target number of performance shares under individual Performance Unit Award Agreements.  The performance shares will be earned as the relative total shareholder return ranking is measured among a designated peer group at the end of a three-year performance period.  Payouts will be based on a predetermined schedule at the end of the performance period. The shares issued may range from 0% to 200% of the number of Performance Units specified in the agreements. The fair value of each performance-based award is estimated on the date of grant using a Monte Carlo simulation model.   We have not granted any performance-based share awards during 2015
	The status of the performance-based share awards as of March 31, 2015 is presented below:
						Weighted
						Average Grant
			Number of			Date Fair Value
			Shares			per Share
	Balance outstanding - January 1, 2015		424		$	8.05
	Forfeited		-26			7.91
	Balance outstanding - March 31, 2015		398		$	8.05
	For discussion of the potential impact of our filing under Chapter 11 of the Bankruptcy Code on our equity, see Note 3 – Voluntary Reorganization under Chapter 11.

Loss_Per_Share

Loss Per Share	3 Months Ended
	Mar. 31, 2015
Loss Per Share [Abstract]
Loss Per Share	Note 13 – Loss per Share
	Basic loss per common share is computed by dividing net loss to common stockholders by the weighted average number of common shares outstanding for the period.  Diluted loss per share includes the effect of our outstanding stock options, warrants and shares issuable pursuant to convertible debt, convertible preferred stock and certain stock incentive plans under the treasury stock method, if including such instruments would be dilutive.
	For each of the periods presented, shares associated with stock options, warrants, convertible debt, convertible preferred stock and certain stock incentive plans were not included because their inclusion would be anti-dilutive.
	The common shares potentially issuable arising from these instruments, which were outstanding during the periods presented in the financial statements consisted of:
		March 31,
		2015	2014
	Warrants, options and stock-based compensation	10,216	9,055
	Convertible debt	16,117	15,933
	Convertible preferred stock	1,691	4,229
		28,024	29,217

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Note 14 – Supplemental Cash Flow Information
	Cash paid (refunded) during the period for interest, income taxes and reorganization items was as follows:
			Three Months Ended March 31,
			2015		2014
	Interest paid	$	12,100	$	47,814
	Income taxes paid (refunded), all related to PRT	$	13,834	$	-14,002
	Reorganization items paid	$	6,805	$	-

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments And Contingencies [Abstract]
Commitments And Contingencies	Note 15 – Commitments and Contingencies
	Commitments Related to Asset Retirement Obligations
	We have entered into decommissioning security agreements related to abandonment liabilities for certain of our U.K. oil and gas properties.  Under these agreements, we are required to post security from time to time in the form of letters of credit, cash or other agreed-upon consideration.    Prior to entry into the LC Issuance Agreement on September 30, 2014 (see below), the commitments under these agreements were not recorded as liabilities, and fees and expenses related to these agreements were included in “Letter of credit fees” in other expenses on our Condensed Consolidated Statements of Operations.
	LC Issuance Agreement
	On September 30, 2014, in conjunction with the Amended Term Loan Facility, the Company entered into an LC Issuance Agreement (the “LC Issuance Agreement”), pursuant to which Credit Suisse agreed to issue letters of credit for Endeavour UK’s account in the amount of approximately £63.1 million as of March 31, 2015, of which £42.5 million, £11.9 million and £8.7 million and relate to decommissioning obligations at Alba, IVRRH and Renee and Rubie, respectively.
	The letters of credit secure decommissioning obligations in connection with certain of Endeavour’s  U.K. Continental Shelf petroleum production.  The Company collateralized its obligations under the LC Issuance Agreement and all letters of credit issued thereunder by posting cash collateral, which has been funded with the proceeds from the Amended Term Loan Facility.
	The posted cash collateral balance of $95.4 million related to the LC Issuance Agreement as of March 31, 2015 is reflected as “Restricted cash, long-term portion” in our Condensed Consolidated Balance Sheets.  The liability related to the posted cash collateral is included as part of the $440 million Amended Term Loan Facility long-term debt obligation.  The LC Issuance Agreement was entered into to replace the Combined Procurement Agreement.
	Combined Procurement Agreement
	On January 24, 2014, we entered into a letter of credit procurement agreement (the “Combined Procurement Agreement”) with an unaffiliated third party (“Payee”), where we agreed to reimburse the Payee for any expense incurred by it in connection with the posting of cash collateral to secure letters of credit issued for our account in the amount of approximately £78 million.  The letters of credit secured decommissioning obligations in connection with certain of our U.K. licenses.  The Combined Procurement Agreement was entered into to replace the previous procurement agreements.
	Under the Combined Procurement Agreement, we paid a quarterly fee computed at a rate of LIBOR plus 7.00% per year (provided that LIBOR shall equal at least 1.25% per year) on the aggregate balance of posted cash collateral.
	Concurrent with our entry into the LC Issuance Agreement on September 30, 2014, the Combined Procurement Agreement was terminated, and we paid all outstanding interest and fees of $1.9 million and $2.4 million, respectively.
	Terminated Acquisition of Marcellus Assets
	SM Energy Company “SM Energy” filed a lawsuit against us in Texas state court on December 20, 2011 alleging that we breached an agreement for the purchase of oil and gas leases, producing properties, geophysical data, a pipeline and related assets in the Marcellus shale play in Pennsylvania by terminating it and refusing to close on the transactions.  On April 16, 2014, we reached an agreement with SM Energy to settle and dismiss the litigation.  In accordance with the settlement agreement, we:
		·	forfeited our $6 million deposit;
		·	paid SM Energy $5 million;
		·	will pay an additional $4.5 million in three graduated payments, beginning in April 2015; and
		·	issued warrants to purchase 2.1 million shares of our common stock with exercise price of $5.29 per share.
	As a result of this settlement, we recorded $19.0 million in total settlement expense during the first quarter of 2014.
	Claim by Mr. William Transier
	We maintained an employment agreement with Mr. Transier that provided for certain severance benefits.  Mr. Transier resigned from his positions as Chief Executive Officer and President effective December 1, 2014.  Mr. Transier filed a claim with the United States Bankruptcy Court for the District of Delaware on December 16, 2014 in the amount of approximately $6.2 million.
	Mr. Transier has asserted that, per his employment agreement, he is entitled to a pro-rata portion of his annual target bonus for the year in which his termination occurred which equates to approximately $0.7 million.
	Additionally he asserts that his contract requires the payment on termination of employment during the contract term (i) at the Company’s election other than as a result of the executive’s misconduct or disability or (ii) at the executive’s election following a “corporate change” or a breach of the employment agreement by us or other “good reason.”  Citing “corporate change” and “good reason,” Mr. Transier’s severance claim of approximately $5.5 million is calculated as follows:
		(i)	three times the sum of the executive’s most recent annual salary and deemed bonus (the average bonus paid during the most recent two years);
		(ii)	all unvested employee restricted stock awards, performance shares and cash performance awards would vest upon any such termination; and
		(iii)	three years of continued coverage for accident and group health insurance benefits substantially similar to those he received immediately prior to the date of termination.
	We have not accrued any portion of the severance claim as a pre-petition liability as of March 31, 2015.
	Legal Proceedings
	Refer to Note 1 — General for information concerning the Bankruptcy Cases.

Guarantor_Subsidiaries

Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2015
General, Debtors Condensed Combined Financial Statements And Guarantor Subsidiaries [Abstract]
Guarantor Subsidiaries	Note 16 – Guarantor Subsidiaries
	Certain of our wholly-owned domestic subsidiaries have, jointly and severally, fully and unconditionally guaranteed the 2018 Notes.  Pursuant to Securities and Exchange Commission (“SEC”) regulations, we have presented in columnar format the condensed consolidating financial information for Endeavour International Corporation, the guarantor subsidiaries on a combined basis, and all non-guarantor subsidiaries on a combined basis.
	The subsidiary guarantees are unsecured obligations of each subsidiary guarantor and rank equally in right of payment with all senior indebtedness of that subsidiary guarantor and senior in right of payment to all subordinated indebtedness of that subsidiary guarantor.  The subsidiary guarantees are effectively subordinated to any secured indebtedness of the subsidiary guarantor with respect to the assets securing the indebtedness.  In addition, the subsidiary guarantees may be released in certain customary circumstances, including (i) the sale of all or substantially all of the properties or assets or a guarantor, (ii) the sale of the capital stock of a guarantor, (iii) the designation of a guarantor as an “Unrestricted Subsidiary,” (iv) upon legal defeasance of the 2018 Notes or satisfaction and discharge of the indentures governing the 2018 Notes, (v) upon the liquidation or dissolution of the guarantor or (vi) if the guarantor ceases to guarantee other of our indebtedness and ceases to be a material subsidiary, each of which is subject to important limitations in the indentures governing the 2018 Notes.
	During 2014, we executed an intercompany loan agreement, effective May 2012, between Endeavour International Corporation and one of its wholly-owned subsidiaries that is a guarantor of the 2018 Notes.  As the intercompany loan is effective for prior periods, the revisions for this loan and related interest to the applicable prior periods are reflected in the financial information herein.  The intercompany loan has no effect on our condensed consolidated results of operations or financial statements of position.
	Condensed consolidating financial statements for our guarantor subsidiaries and non-guarantor subsidiaries are presented in the following tables:
	As of March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	17,515		$	48,983		$	-	$	66,498
	Accounts receivable		-			2,187			32,083			-		34,270
	Current receivables due from affiliates		494,133			68,055			100,272			-662,460		-
	Prepaid expenses and other		-			5,881			30,940			-		36,821
	Current Assets		494,133			93,638			212,278			-662,460		137,589
	Property, plant and equipment, net		-			30,077			313,658			-		343,735
	Restricted cash, long-term portion		-			-			95,356			-		95,356
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			11			62			-		73
	Total Assets	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	Accounts payable	$	-		$	2,833		$	29,864		$	-	$	32,697
	Current maturities of debt		-			-			433,141			-		433,141
	Deferred revenue		-			-			594			-		594
	Current liabilities due to affiliates		648			594,376			67,436			-662,460		-
	Asset retirement obligations, current portion		-			41			29,794			-		29,835
	Accrued expenses and other		621			3,946			765			-		5,332
	Current Liabilities		1,269			601,196			561,594			-662,460		501,599
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			39,118			-		39,118
	Other liabilities		-3			449			64,050			-		64,496
	Total Liabilities Not Subject to Compromise		1,266			1,155,645			1,164,762			-1,716,460		605,213
	Liabilities Subject to Compromise		751,221			5,933			83,746			-		840,900
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		335,827			-318,794			-627,154			-276,720		-886,841
	Total Liabilities and Equity	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	As of December 31, 2014
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	32,055		$	49,795		$	-	$	81,850
	Accounts receivable		-			2,427			33,080			-		35,507
	Current receivables due from affiliates		477,351			53,174			104,085			-634,610		-
	Prepaid expenses and other		-			7,350			40,047			-		47,397
	Current Assets		477,351			95,006			227,007			-634,610		164,754
	Property, plant and equipment, net		-			35,529			433,980			-		469,509
	Restricted cash, long term portion		-			-			100,241			-		100,241
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			10			62			-		72
	Total Assets	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	Accounts payable	$	-		$	2,065		$	25,299		$	-	$	27,364
	Current maturities of debt		-			-			432,181			-		432,181
	Deferred revenue		-			-			14,157			-		14,157
	Current liabilities due to affiliates		648			581,402			52,560			-634,610		-
	Asset retirement obligations, current portion		-			42			40,505			-		40,547
	Accrued expenses and other		385			5,663			9,148			-		15,196
	Current Liabilities		1,033			589,172			573,850			-634,610		529,445
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			56,670			-		56,670
	Other liabilities		1			436			65,640					66,077
	Total Liabilities Not Subject to Compromise		1,034			1,143,608			1,196,160			-1,688,610		652,192
	Liabilities Subject to Compromise		751,219			6,079			83,746			-		841,044
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		319,279			-300,084			-518,616			-276,720		-776,141
	Total Liabilities and Equity	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	For the Three Months Ended March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Revenue	$	-		$	1,083		$	63,246		$	-	$	64,329
Operating expenses		-			1,289			22,856			-		24,145
DD&A expense		-			562			55,999			-		56,561
Impairment of oil and gas properties		-			10,078			80,009			-		90,087
Insurance proceeds		-			-			-8,425			-		-8,425
G&A expenses		33			-649			3,188			-		2,572
Loss from Operations		-33			-10,197			-90,381			-		-100,611
Other Income (Expense):
Interest expense		-			-16,620			-29,351			31,620		-14,351
Letter of credit fees		-			-			-58			-		-58
Financing and transaction costs		-			-45			-980			-		-1,025
Reorganization items		-			-6,866			-			-		-6,866
Unrealized foreign currency gains (losses)		-			-			4			-		4
Other income (expense)		16,620			15,018			87			-31,620		105
Income (loss) before income taxes		16,587			-18,710			-120,679			-		-122,802
Petroleum Revenue Tax ("PRT") Benefit		-			-			-12,141			-		-12,141
Corporate Tax Benefit		-			-			-			-		-
Total tax benefit		-			-			-12,141			-		-12,141
Net income (loss)		16,587			-18,710			-108,538			-		-110,661
Preferred stock dividends		-			-			-			-		-
Net income (loss) to common shareholders	$	16,587		$	-18,710		$	-108,538		$	-	$	-110,661
For the Three Months Ended March 31, 2014
	Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
Revenue	$	-		$	1,947		$	92,216		$	-	$	94,163
Operating expenses		-			1,181			25,989			-		27,170
DD&A expense		-			721			44,247			-		44,968
G&A expenses		995			3,709			145			-		4,849
Income (loss) from Operations		-995			-3,664			21,835			-		17,176
Other Income (Expense):
Unrealized gains on derivatives		469			-			2,190			-		2,659
Interest expense		-20,620			-16,042			-26,435			31,620		-31,477
Letter of credit fees		-			-			-3,789			-		-3,789
Financing and transaction costs		-323			-590			-903					-1,816
Loss on early extinguishment of financing		-			-			-3,543			-		-3,543
agreements
Litigation settlement expense		-			-19,034			-			-		-19,034
Unrealized foreign currency gains (losses)		-			-			-1,273			-		-1,273
Other income (expense)		16,621			14,996			-201			-31,620		-204
Loss before income taxes		-4,848			-24,334			-12,119			-		-41,301
Petroleum Revenue Tax ("PRT") Expense		-			-			1,725			-		1,725
Corporate Tax Expense		-			-			1,844			-		1,844
Total tax expense		-			-			3,569			-		3,569
Net loss		-4,848			-24,334			-15,688			-		-44,870
Preferred stock dividends		456			-			-			-		456
Net loss to common shareholders	$	-5,304		$	-24,334		$	-15,688		$	-	$	-45,326
For the Three Months Ended March 31, 2015
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	16,587	$	-18,710	$	-108,538	$	-	$	-110,661
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		562		55,999		-		56,561
Impairment of oil and gas properties		-		10,078		80,009		-		90,087
Deferred tax expense (benefit)		-		-		-11,137		-		-11,137
Amortization of non-cash compensation		-		-		-		-10		-10
Amortization of loan costs and discount		-		-		2,238		-		2,238
Other		-39		6,338		-11,316		-		-5,017
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		240		997		-		1,237
(Increase) decrease in other current assets		-		-17,219		19,843		-		2,624
Increase (decrease) in liabilities		236		-7,399		-15,895		-		-23,058
Net Cash Provided by (Used in)
Operating Activities		16,784		-26,110		12,200		-10		2,864
Cash Flows From Investing Activities:
Capital expenditures		-		-5,826		-17,897		622		-23,101
Increase in restricted cash		-		-		4,885		-		4,885
Net Cash Used in Investing Activities		-		-5,826		-13,012		622		-18,216
Cash Flows From Financing Activities:
Intercompany cash management		-16,784		17,396		-		-612		-
Other financing		-		-		-		-		-
Net Cash Provided by (Used in)
Financing Activities		-16,784		17,396		-		-612		-
Net Change in Cash and Cash Equivalents		-		-14,540		-812		-		-15,352
Cash and Cash Equivalents, Beginning
of Period		-		32,055		49,795		-		81,850
Cash and Cash Equivalents, End of Period	$	-	$	17,515	$	48,983	$	-	$	66,498
For the Three Months Ended March 31, 2014
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-4,848	$	-24,334	$	-15,688	$	-	$	-44,870
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		721		44,247		-		44,968
Deferred tax expense (benefit)		-		-		1,969		-		1,969
Unrealized (gains) losses on derivatives		-469		-		-2,190		-		-2,659
Amortization of non-cash compensation		162		-		-		809		971
Amortization of loan costs and discount		2,049		-		4,656		-		6,705
Non-cash interest expense		-		-		1,883		-		1,883
Litigation settlement expense		-		19,034		-		-		19,034
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Other		-		-4		1,851		-		1,847
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		-852		19,853		-		19,001
(Increase) decrease in other current assets		-		-238		-4,818		-		-5,056
Increase (decrease) in liabilities		-17,438		20,381		-23,658		-2,385		-23,100
Net Cash Provided by (Used in)
Operating Activities		-20,544		14,708		34,961		-1,576		27,549
Cash Flows From Investing Activities:
Capital expenditures		-		-15,328		-15,093		1,576		-28,845
Proceeds from sales, net of cash		-		1,352		-		-		1,352
Increase in restricted cash		-		-		-2,457		-		-2,457
Net Cash Used in Investing Activities		-		-13,976		-17,550		1,576		-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-		-		-115,163		-		-115,163
Borrowings under debt agreements, net
of debt discount		17,500		-		123,125		-		140,625
Proceeds from issuance of common stock		12,376		-		-		-		12,376
Repayments of MPP		-		-		-5,000		-		-5,000
Intercompany cash management		-8,460		25,604		-17,144		-		-
Financing costs paid		-456		-		-8,817		-		-9,273
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		20,544		25,604		-22,999		-		23,149
Net Change in Cash and Cash Equivalents		-		26,336		-5,588		-		20,748
Cash and Cash Equivalents, Beginning
of Period		-		2,417		32,325		-		34,742
Cash and Cash Equivalents, End of Period	$	-	$	28,753	$	26,737	$	-	$	55,490

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 17 – Subsequent Events
	On April 29, 2015, the Debtors terminated the RSA and filed a notice with the Bankruptcy Court to withdraw the Plan.  We have determined that as a result of the recent decline in commodity prices, the Plan was not feasible and, accordingly, we will not continue to seek its confirmation.
	On April 29, 2015, in light of the foregoing, the Company also filed with the Bankruptcy Court a motion to, among other things, approve the sale of substantially all of the Company’s U.S. oil and gas assets and, in connection with such sale, establish bidding procedures and an auction.  Certain non-Debtors are also exploring restructuring alternatives, including preparing for the commencement of a separate marketing process in the U.K. for the sale of substantially all their U.K.-based oil and gas assets.
	Refer to Note 3 – Voluntary Reorganization Under Chapter 11 for further information.

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation and Use of Estimates
	Basis of Presentation and Use of Estimates
	The accompanying unaudited condensed consolidated financial statements have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and have been presented on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business.  The accompanying financial statements do not include any adjustments to reflect the possible future effects on the recoverability of assets or the amounts of liabilities that may result from the outcome of this uncertainty.  See Note 1 – General – Going Concern.
	In the opinion of management, all normal recurring adjustments considered necessary for a fair presentation have been included in these financial statements.  Certain amounts for prior periods have been reclassified to conform to the current presentation.
	U.S. GAAP requires management to use estimates, judgments and assumptions that affect the amounts of assets, liabilities, revenues and expenses reported herein.  While management regularly reviews its estimates, actual results could differ from those estimates.
	Management believes that it is reasonably possible that the following material estimates affecting the financial statements could change in the current year:
		·	estimates of proved oil and gas reserves;
		·	estimates as to the expected future cash flow from proved oil and gas properties; and
		·	estimates of future dismantlement and restoration costs.
Recent Accounting Standards	Recent Accounting Pronouncements
	In March 2015, the Financial Accounting Standards Board (FASB) issued an update to the accounting standards to simplify the presentation of debt issuance costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.  The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update.  The guidance is effective for interim periods and annual period beginning after December 15, 2015; however early adoption is permitted.  We are currently evaluating the effect that adopting this guidance will have on our financial position, results of operations or cash flows.
	In May 2014, the FASB issued a new standard on revenue recognition.  The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized.  The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The new standard is effective for annual periods beginning after December 31, 2016 and can be adopted either retrospectively to each reporting period or retrospectively with a cumulative-effect adjustment as of the date of adoption.  In April 2015, the FASB proposed to delay the effective date one year, effective for annual periods beginning after December 31, 2017. The proposal will be subject to the FASB’s due process requirement, which includes a period for public comments. We are currently evaluating the effect that adopting this guidance will have on our financial position, results of operations or cash flows.

Debtors_Condensed_Combined_Fin1

Debtors Condensed Combined Financial Statements (Tables)	3 Months Ended
	Mar. 31, 2015
Schedule Of Debtors Condensed Combined Financial Statements
	As of March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	17,515		$	48,983		$	-	$	66,498
	Accounts receivable		-			2,187			32,083			-		34,270
	Current receivables due from affiliates		494,133			68,055			100,272			-662,460		-
	Prepaid expenses and other		-			5,881			30,940			-		36,821
	Current Assets		494,133			93,638			212,278			-662,460		137,589
	Property, plant and equipment, net		-			30,077			313,658			-		343,735
	Restricted cash, long-term portion		-			-			95,356			-		95,356
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			11			62			-		73
	Total Assets	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	Accounts payable	$	-		$	2,833		$	29,864		$	-	$	32,697
	Current maturities of debt		-			-			433,141			-		433,141
	Deferred revenue		-			-			594			-		594
	Current liabilities due to affiliates		648			594,376			67,436			-662,460		-
	Asset retirement obligations, current portion		-			41			29,794			-		29,835
	Accrued expenses and other		621			3,946			765			-		5,332
	Current Liabilities		1,269			601,196			561,594			-662,460		501,599
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			39,118			-		39,118
	Other liabilities		-3			449			64,050			-		64,496
	Total Liabilities Not Subject to Compromise		1,266			1,155,645			1,164,762			-1,716,460		605,213
	Liabilities Subject to Compromise		751,221			5,933			83,746			-		840,900
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		335,827			-318,794			-627,154			-276,720		-886,841
	Total Liabilities and Equity	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	As of December 31, 2014
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	32,055		$	49,795		$	-	$	81,850
	Accounts receivable		-			2,427			33,080			-		35,507
	Current receivables due from affiliates		477,351			53,174			104,085			-634,610		-
	Prepaid expenses and other		-			7,350			40,047			-		47,397
	Current Assets		477,351			95,006			227,007			-634,610		164,754
	Property, plant and equipment, net		-			35,529			433,980			-		469,509
	Restricted cash, long term portion		-			-			100,241			-		100,241
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			10			62			-		72
	Total Assets	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	Accounts payable	$	-		$	2,065		$	25,299		$	-	$	27,364
	Current maturities of debt		-			-			432,181			-		432,181
	Deferred revenue		-			-			14,157			-		14,157
	Current liabilities due to affiliates		648			581,402			52,560			-634,610		-
	Asset retirement obligations, current portion		-			42			40,505			-		40,547
	Accrued expenses and other		385			5,663			9,148			-		15,196
	Current Liabilities		1,033			589,172			573,850			-634,610		529,445
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			56,670			-		56,670
	Other liabilities		1			436			65,640					66,077
	Total Liabilities Not Subject to Compromise		1,034			1,143,608			1,196,160			-1,688,610		652,192
	Liabilities Subject to Compromise		751,219			6,079			83,746			-		841,044
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		319,279			-300,084			-518,616			-276,720		-776,141
	Total Liabilities and Equity	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	For the Three Months Ended March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Revenue	$	-		$	1,083		$	63,246		$	-	$	64,329
	Operating expenses		-			1,289			22,856			-		24,145
	DD&A expense		-			562			55,999			-		56,561
	Impairment of oil and gas properties		-			10,078			80,009			-		90,087
	Insurance proceeds		-			-			-8,425			-		-8,425
G&A expenses		33			-649			3,188			-		2,572
Loss from Operations		-33			-10,197			-90,381			-		-100,611
Other Income (Expense):
Interest expense		-			-16,620			-29,351			31,620		-14,351
Letter of credit fees		-			-			-58			-		-58
Financing and transaction costs		-			-45			-980			-		-1,025
Reorganization items		-			-6,866			-			-		-6,866
Unrealized foreign currency gains (losses)		-			-			4			-		4
Other income (expense)		16,620			15,018			87			-31,620		105
Income (loss) before income taxes		16,587			-18,710			-120,679			-		-122,802
Petroleum Revenue Tax ("PRT") Benefit		-			-			-12,141			-		-12,141
Corporate Tax Benefit		-			-			-			-		-
Total tax benefit		-			-			-12,141			-		-12,141
Net income (loss)		16,587			-18,710			-108,538			-		-110,661
Preferred stock dividends		-			-			-			-		-
Net income (loss) to common shareholders	$	16,587		$	-18,710		$	-108,538		$	-	$	-110,661
For the Three Months Ended March 31, 2014
	Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
Revenue	$	-		$	1,947		$	92,216		$	-	$	94,163
Operating expenses		-			1,181			25,989			-		27,170
DD&A expense		-			721			44,247			-		44,968
G&A expenses		995			3,709			145			-		4,849
Income (loss) from Operations		-995			-3,664			21,835			-		17,176
Other Income (Expense):
Unrealized gains on derivatives		469			-			2,190			-		2,659
Interest expense		-20,620			-16,042			-26,435			31,620		-31,477
Letter of credit fees		-			-			-3,789			-		-3,789
Financing and transaction costs		-323			-590			-903					-1,816
Loss on early extinguishment of financing		-			-			-3,543			-		-3,543
agreements
Litigation settlement expense		-			-19,034			-			-		-19,034
Unrealized foreign currency gains (losses)		-			-			-1,273			-		-1,273
Other income (expense)		16,621			14,996			-201			-31,620		-204
Loss before income taxes		-4,848			-24,334			-12,119			-		-41,301
Petroleum Revenue Tax ("PRT") Expense		-			-			1,725			-		1,725
Corporate Tax Expense		-			-			1,844			-		1,844
Total tax expense		-			-			3,569			-		3,569
Net loss		-4,848			-24,334			-15,688			-		-44,870
Preferred stock dividends		456			-			-			-		456
Net loss to common shareholders	$	-5,304		$	-24,334		$	-15,688		$	-	$	-45,326
For the Three Months Ended March 31, 2015
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	16,587	$	-18,710	$	-108,538	$	-	$	-110,661
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		562		55,999		-		56,561
Impairment of oil and gas properties		-		10,078		80,009		-		90,087
Deferred tax expense (benefit)		-		-		-11,137		-		-11,137
Amortization of non-cash compensation		-		-		-		-10		-10
Amortization of loan costs and discount		-		-		2,238		-		2,238
Other		-39		6,338		-11,316		-		-5,017
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		240		997		-		1,237
(Increase) decrease in other current assets		-		-17,219		19,843		-		2,624
Increase (decrease) in liabilities		236		-7,399		-15,895		-		-23,058
Net Cash Provided by (Used in)
Operating Activities		16,784		-26,110		12,200		-10		2,864
Cash Flows From Investing Activities:
Capital expenditures		-		-5,826		-17,897		622		-23,101
Increase in restricted cash		-		-		4,885		-		4,885
Net Cash Used in Investing Activities		-		-5,826		-13,012		622		-18,216
Cash Flows From Financing Activities:
Intercompany cash management		-16,784		17,396		-		-612		-
Other financing		-		-		-		-		-
Net Cash Provided by (Used in)
Financing Activities		-16,784		17,396		-		-612		-
Net Change in Cash and Cash Equivalents		-		-14,540		-812		-		-15,352
Cash and Cash Equivalents, Beginning
of Period		-		32,055		49,795		-		81,850
Cash and Cash Equivalents, End of Period	$	-	$	17,515	$	48,983	$	-	$	66,498
For the Three Months Ended March 31, 2014
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-4,848	$	-24,334	$	-15,688	$	-	$	-44,870
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		721		44,247		-		44,968
Deferred tax expense (benefit)		-		-		1,969		-		1,969
Unrealized (gains) losses on derivatives		-469		-		-2,190		-		-2,659
Amortization of non-cash compensation		162		-		-		809		971
Amortization of loan costs and discount		2,049		-		4,656		-		6,705
Non-cash interest expense		-		-		1,883		-		1,883
Litigation settlement expense		-		19,034		-		-		19,034
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Other		-		-4		1,851		-		1,847
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		-852		19,853		-		19,001
(Increase) decrease in other current assets		-		-238		-4,818		-		-5,056
Increase (decrease) in liabilities		-17,438		20,381		-23,658		-2,385		-23,100
Net Cash Provided by (Used in)
Operating Activities		-20,544		14,708		34,961		-1,576		27,549
Cash Flows From Investing Activities:
Capital expenditures		-		-15,328		-15,093		1,576		-28,845
Proceeds from sales, net of cash		-		1,352		-		-		1,352
Increase in restricted cash		-		-		-2,457		-		-2,457
Net Cash Used in Investing Activities		-		-13,976		-17,550		1,576		-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-		-		-115,163		-		-115,163
Borrowings under debt agreements, net
of debt discount		17,500		-		123,125		-		140,625
Proceeds from issuance of common stock		12,376		-		-		-		12,376
Repayments of MPP		-		-		-5,000		-		-5,000
Intercompany cash management		-8,460		25,604		-17,144		-		-
Financing costs paid		-456		-		-8,817		-		-9,273
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		20,544		25,604		-22,999		-		23,149
Net Change in Cash and Cash Equivalents		-		26,336		-5,588		-		20,748
Cash and Cash Equivalents, Beginning
of Period		-		2,417		32,325		-		34,742
Cash and Cash Equivalents, End of Period	$	-	$	28,753	$	26,737	$	-	$	55,490
Debtors [Member]
Schedule Of Debtors Condensed Combined Financial Statements
	Condensed Combined Balance Sheet
	As of March 31, 2015
	Assets:
	Current Assets	$	25,592
	Property and Equipment, Net ($11,466 not subject to amortization)		30,077
	Long-Term Receivables Due from Affiliates (1)		648,801
	Investments in Subsidiaries		295,816
	Other Assets		9
	Total Assets	$	1,000,295
	Liabilities Not Subject to Compromise:
	Accrued expenses and other	$	7,495
	Current Liabilities Due to Affiliates (1)		101,386
	Other		630
	Liabilities Subject to Compromise (2)		840,900
	Series C Convertible Preferred Stock - Liquidation Preference: $14,800		17,481
	Stockholders' Equity (3)		32,403
	Total Liabilities and Stockholders’ Equity	$	1,000,295
		-1		It is expected that upon consummation of the Bankruptcy Cases, all intercompany receivables and payables will be offset and settled through equity contributions.  No allowances for intercompany receivables from the Debtors have been recorded in the condensed combined financial statements.
		-2		See Note 5 – Liabilities Subject to Compromise
		-3		It is expected that upon consummation of the Bankruptcy Cases, all common stock of the Debtors will be cancelled and new common stock will be issued to partially satisfy the bankruptcy claims.
	Condensed Combined Statement of Operations
	Three Months Ended March 31, 2015
	Revenues	$	1,082
	Cost of Operations		11,314
	Loss from Operations		-10,232
	Other Income (Expense):
	Interest income		15,000
	Financing and transaction costs		-58
	Reorganization items (4)		-6,866
	Other expense		26
	Total Other Income		8,102
	Net Loss		-2,130
		-4		See Note 5 – Liabilities Subject to Compromise for additional discussion of Reorganization items.
	Condensed Combined Cash Flow
	Three Months Ended March 31, 2015
	Net cash provided by (used in):
	Operating	$	36,603
	Investing		-52,784
	Financing		16
	Net decrease in cash and cash equivalents		-16,165
	Cash and Cash Equivalents, Beginning of Period		131,656
	Cash and Cash Equivalents, End of Period	$	115,491

Liabilities_Subject_To_Comprom1

Liabilities Subject To Compromise (Tables)	3 Months Ended
	Mar. 31, 2015
Liabilities Subject To Compromise [Abstract]
Schedule Of Liabilities Subject To Compromise
	Accounts Payable	$	5,935
	Debt		790,246
	Accrued Interest and Dividends		44,719
	Total Liabilities Subject to Compromise	$	840,900

Property_And_Equipment_Tables

Property And Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property And Equipment [Abstract]
Schedule Of Property And Equipment
			March 31,		December 31,
			2015		2014
	Oil and Gas Properties Under the Full Cost Method:
	Subject to Amortization	$	916,437	$	989,758
	Not Subject to Amortization:
	Incurred in 2015		682		-
	Incurred in 2014		945		945
	Incurred in 2013		774		774
	Incurred prior to 2013		9,065		9,065
			927,903		1,000,542
	Computers, Furniture and Fixtures		8,733		8,733
	Total Property and Equipment		936,636		1,009,275
	Accumulated Depreciation, Depletion and Amortization		-592,901		-539,766
	Net Property and Equipment	$	343,735	$	469,509

Debt_Obligations_Tables

Debt Obligations (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Obligations [Abstract]
Schedule Of Debt
			March 31,			December 31,
			2015			2014
	Liabilities Subject to Compromise: (1)
	Senior Notes, 12% Fixed Rate, Due 2018	$	554,000		$	554,000
	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016		135,000			135,000
	Convertible Bonds, 11.5% Until March 31, 2014 and 7.5% Thereafter,		83,746			83,746
	due 2016
	Convertible Senior Notes, 6.5% Fixed Rate, Due 2017		17,500			17,500
	Total Liabilities Subject to Compromise		790,246			790,246
	Liabilities Not Subject to Compromise:
	Amended Term Loan Facility, Variable Rate, Due 2017		440,000			440,000
	Total Debt Obligations		1,230,246			1,230,246
	Less:  Debt Discount		-6,859			-7,819
	Less:  Liabilities Subject to Compromise		-790,246			-790,246
	Less:  Current Maturities		-433,141			-432,181
	Long-Term Debt	$	-		$	-
		-1		For discussion of the potential impact of our filing under Chapter 11 of the Bankruptcy Code on our debt obligations, see Note 3 – Voluntary Reorganization under Chapter 11.  As a result of our filing under Chapter 11 of the Bankruptcy Code, we are in default of the debt covenants related to the Senior Notes, 5.5% Convertible Senior Notes, 7.5% Convertible Bonds and 6.5% Convertible Senior Notes.  All outstanding balances related to these obligations have been reclassified as Liabilities Subject to Compromise in our Condensed Consolidated Balance Sheets.

Other_LongTerm_Liabilities_Tab

Other Long-Term Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Other Long-Term Liabilities [Abstract]
Schedule Of Other Liabilities
			March 31,		December 31,
			2015		2014
	Asset Retirement Obligations	$	64,359	$	65,935
	Other		137		142
	Total Other Liabilities	$	64,496	$	66,077
Schedule Of Asset Retirement Obligations
			Three Months Ended
			March 31,
			2015
	Carrying amount of asset retirement obligations as of December 31, 2014	$	106,482
	Accretion expense (included in DD&A expense)		3,425
	Impact of foreign currency exchange rate changes		-5,014
	Payment of asset retirement obligations		-10,699
	Liabilities incurred and assumed		-
	Carrying amount of asset retirement obligations, as of end of period		94,194
	Less:  Current portion of asset retirement obligations		-29,835
	Long-term asset retirement obligations	$	64,359

StockBased_Compensation_Arrang1

Stock-Based Compensation Arrangements (Tables)	3 Months Ended
	Mar. 31, 2015
Stock-Based Compensation Arrangements [Abstract]
Schedule Of General And Administrative Expenses
			Three Months Ended
			March 31,
		2015			2014
	G&A Expenses	$	-10		$	971
	Capitalized G&A		-29			163
	Total non-cash stock-based compensation	$	-39		$	1,134
Schedule Of Outstanding Stock Options
		Number of		Weighted		Weighted
		Shares		Average		Average		Aggregate
		Underlying		Exercise Price		Contractual		Intrinsic
		Options		per Share		Life in Years		Value
	Balance outstanding - January 1, 2015	107	$	7.76
	Expired	-87		8.21
	Balance outstanding - March 31, 2015	20	$	5.83		3.4	$	-
	Currently exercisable - March 31, 2015	20	$	5.83		3.4	$	-
Schedule Of Restricted Shares Granted
						Weighted
						Average Grant
			Number of			Date Fair Value
			Shares			per Share
	Balance outstanding - January 1, 2015		740		$	4.93
	Vested		-245			5.90
	Forfeited		-27			5.69
	Balance outstanding - March 31, 2015		468		$	4.40
	Total grant date fair value of shares vesting during the period	$	38.3
Schedule Of Performance-Based Share Awards
						Weighted
						Average Grant
			Number of			Date Fair Value
			Shares			per Share
	Balance outstanding - January 1, 2015		424		$	8.05
	Forfeited		-26			7.91
	Balance outstanding - March 31, 2015		398		$	8.05

Loss_Per_Share_Tables

Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Loss Per Share [Abstract]
Schedule Of Common Shares Potentially Issuable
		March 31,
		2015	2014
	Warrants, options and stock-based compensation	10,216	9,055
	Convertible debt	16,117	15,933
	Convertible preferred stock	1,691	4,229
		28,024	29,217

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Schedule Of Supplemental Cash Flow Information
			Three Months Ended March 31,
			2015		2014
	Interest paid	$	12,100	$	47,814
	Income taxes paid (refunded), all related to PRT	$	13,834	$	-14,002
	Reorganization items paid	$	6,805	$	-

Guarantor_Subsidiaries_Tables

Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2015
General, Debtors Condensed Combined Financial Statements And Guarantor Subsidiaries [Abstract]
Schedule Of Condensed Financial Statements
	As of March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	17,515		$	48,983		$	-	$	66,498
	Accounts receivable		-			2,187			32,083			-		34,270
	Current receivables due from affiliates		494,133			68,055			100,272			-662,460		-
	Prepaid expenses and other		-			5,881			30,940			-		36,821
	Current Assets		494,133			93,638			212,278			-662,460		137,589
	Property, plant and equipment, net		-			30,077			313,658			-		343,735
	Restricted cash, long-term portion		-			-			95,356			-		95,356
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			11			62			-		73
	Total Assets	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	Accounts payable	$	-		$	2,833		$	29,864		$	-	$	32,697
	Current maturities of debt		-			-			433,141			-		433,141
	Deferred revenue		-			-			594			-		594
	Current liabilities due to affiliates		648			594,376			67,436			-662,460		-
	Asset retirement obligations, current portion		-			41			29,794			-		29,835
	Accrued expenses and other		621			3,946			765			-		5,332
	Current Liabilities		1,269			601,196			561,594			-662,460		501,599
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			39,118			-		39,118
	Other liabilities		-3			449			64,050			-		64,496
	Total Liabilities Not Subject to Compromise		1,266			1,155,645			1,164,762			-1,716,460		605,213
	Liabilities Subject to Compromise		751,221			5,933			83,746			-		840,900
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		335,827			-318,794			-627,154			-276,720		-886,841
	Total Liabilities and Equity	$	1,105,795		$	842,784		$	621,354		$	-1,993,180	$	576,753
	As of December 31, 2014
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Cash and cash equivalents	$	-		$	32,055		$	49,795		$	-	$	81,850
	Accounts receivable		-			2,427			33,080			-		35,507
	Current receivables due from affiliates		477,351			53,174			104,085			-634,610		-
	Prepaid expenses and other		-			7,350			40,047			-		47,397
	Current Assets		477,351			95,006			227,007			-634,610		164,754
	Property, plant and equipment, net		-			35,529			433,980			-		469,509
	Restricted cash, long term portion		-			-			100,241			-		100,241
	Long-term receivables due from affiliates		554,000			500,000			-			-1,054,000		-
	Investments in subsidiaries		57,662			219,058			-			-276,720		-
	Other assets		-			10			62			-		72
	Total Assets	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	Accounts payable	$	-		$	2,065		$	25,299		$	-	$	27,364
	Current maturities of debt		-			-			432,181			-		432,181
	Deferred revenue		-			-			14,157			-		14,157
	Current liabilities due to affiliates		648			581,402			52,560			-634,610		-
	Asset retirement obligations, current portion		-			42			40,505			-		40,547
	Accrued expenses and other		385			5,663			9,148			-		15,196
	Current Liabilities		1,033			589,172			573,850			-634,610		529,445
	Long-term liabilities due to affiliates		-			554,000			500,000			-1,054,000		-
	Deferred taxes		-			-			56,670			-		56,670
	Other liabilities		1			436			65,640					66,077
	Total Liabilities Not Subject to Compromise		1,034			1,143,608			1,196,160			-1,688,610		652,192
	Liabilities Subject to Compromise		751,219			6,079			83,746			-		841,044
	Series C convertible preferred stock		17,481			-			-			-		17,481
	Stockholders' equity (deficit)		319,279			-300,084			-518,616			-276,720		-776,141
	Total Liabilities and Equity	$	1,089,013		$	849,603		$	761,290		$	-1,965,330	$	734,576
	For the Three Months Ended March 31, 2015
		Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
	Revenue	$	-		$	1,083		$	63,246		$	-	$	64,329
	Operating expenses		-			1,289			22,856			-		24,145
	DD&A expense		-			562			55,999			-		56,561
	Impairment of oil and gas properties		-			10,078			80,009			-		90,087
	Insurance proceeds		-			-			-8,425			-		-8,425
G&A expenses		33			-649			3,188			-		2,572
Loss from Operations		-33			-10,197			-90,381			-		-100,611
Other Income (Expense):
Interest expense		-			-16,620			-29,351			31,620		-14,351
Letter of credit fees		-			-			-58			-		-58
Financing and transaction costs		-			-45			-980			-		-1,025
Reorganization items		-			-6,866			-			-		-6,866
Unrealized foreign currency gains (losses)		-			-			4			-		4
Other income (expense)		16,620			15,018			87			-31,620		105
Income (loss) before income taxes		16,587			-18,710			-120,679			-		-122,802
Petroleum Revenue Tax ("PRT") Benefit		-			-			-12,141			-		-12,141
Corporate Tax Benefit		-			-			-			-		-
Total tax benefit		-			-			-12,141			-		-12,141
Net income (loss)		16,587			-18,710			-108,538			-		-110,661
Preferred stock dividends		-			-			-			-		-
Net income (loss) to common shareholders	$	16,587		$	-18,710		$	-108,538		$	-	$	-110,661
For the Three Months Ended March 31, 2014
	Endeavour International Corporation			Combined Guarantor Subsidiaries			Combined Non-Guarantor Subsidiaries			Eliminations		Consolidated
Revenue	$	-		$	1,947		$	92,216		$	-	$	94,163
Operating expenses		-			1,181			25,989			-		27,170
DD&A expense		-			721			44,247			-		44,968
G&A expenses		995			3,709			145			-		4,849
Income (loss) from Operations		-995			-3,664			21,835			-		17,176
Other Income (Expense):
Unrealized gains on derivatives		469			-			2,190			-		2,659
Interest expense		-20,620			-16,042			-26,435			31,620		-31,477
Letter of credit fees		-			-			-3,789			-		-3,789
Financing and transaction costs		-323			-590			-903					-1,816
Loss on early extinguishment of financing		-			-			-3,543			-		-3,543
agreements
Litigation settlement expense		-			-19,034			-			-		-19,034
Unrealized foreign currency gains (losses)		-			-			-1,273			-		-1,273
Other income (expense)		16,621			14,996			-201			-31,620		-204
Loss before income taxes		-4,848			-24,334			-12,119			-		-41,301
Petroleum Revenue Tax ("PRT") Expense		-			-			1,725			-		1,725
Corporate Tax Expense		-			-			1,844			-		1,844
Total tax expense		-			-			3,569			-		3,569
Net loss		-4,848			-24,334			-15,688			-		-44,870
Preferred stock dividends		456			-			-			-		456
Net loss to common shareholders	$	-5,304		$	-24,334		$	-15,688		$	-	$	-45,326
For the Three Months Ended March 31, 2015
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	16,587	$	-18,710	$	-108,538	$	-	$	-110,661
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		562		55,999		-		56,561
Impairment of oil and gas properties		-		10,078		80,009		-		90,087
Deferred tax expense (benefit)		-		-		-11,137		-		-11,137
Amortization of non-cash compensation		-		-		-		-10		-10
Amortization of loan costs and discount		-		-		2,238		-		2,238
Other		-39		6,338		-11,316		-		-5,017
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		240		997		-		1,237
(Increase) decrease in other current assets		-		-17,219		19,843		-		2,624
Increase (decrease) in liabilities		236		-7,399		-15,895		-		-23,058
Net Cash Provided by (Used in)
Operating Activities		16,784		-26,110		12,200		-10		2,864
Cash Flows From Investing Activities:
Capital expenditures		-		-5,826		-17,897		622		-23,101
Increase in restricted cash		-		-		4,885		-		4,885
Net Cash Used in Investing Activities		-		-5,826		-13,012		622		-18,216
Cash Flows From Financing Activities:
Intercompany cash management		-16,784		17,396		-		-612		-
Other financing		-		-		-		-		-
Net Cash Provided by (Used in)
Financing Activities		-16,784		17,396		-		-612		-
Net Change in Cash and Cash Equivalents		-		-14,540		-812		-		-15,352
Cash and Cash Equivalents, Beginning
of Period		-		32,055		49,795		-		81,850
Cash and Cash Equivalents, End of Period	$	-	$	17,515	$	48,983	$	-	$	66,498
For the Three Months Ended March 31, 2014
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-4,848	$	-24,334	$	-15,688	$	-	$	-44,870
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		721		44,247		-		44,968
Deferred tax expense (benefit)		-		-		1,969		-		1,969
Unrealized (gains) losses on derivatives		-469		-		-2,190		-		-2,659
Amortization of non-cash compensation		162		-		-		809		971
Amortization of loan costs and discount		2,049		-		4,656		-		6,705
Non-cash interest expense		-		-		1,883		-		1,883
Litigation settlement expense		-		19,034		-		-		19,034
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Other		-		-4		1,851		-		1,847
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		-852		19,853		-		19,001
(Increase) decrease in other current assets		-		-238		-4,818		-		-5,056
Increase (decrease) in liabilities		-17,438		20,381		-23,658		-2,385		-23,100
Net Cash Provided by (Used in)
Operating Activities		-20,544		14,708		34,961		-1,576		27,549
Cash Flows From Investing Activities:
Capital expenditures		-		-15,328		-15,093		1,576		-28,845
Proceeds from sales, net of cash		-		1,352		-		-		1,352
Increase in restricted cash		-		-		-2,457		-		-2,457
Net Cash Used in Investing Activities		-		-13,976		-17,550		1,576		-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-		-		-115,163		-		-115,163
Borrowings under debt agreements, net
of debt discount		17,500		-		123,125		-		140,625
Proceeds from issuance of common stock		12,376		-		-		-		12,376
Repayments of MPP		-		-		-5,000		-		-5,000
Intercompany cash management		-8,460		25,604		-17,144		-		-
Financing costs paid		-456		-		-8,817		-		-9,273
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		20,544		25,604		-22,999		-		23,149
Net Change in Cash and Cash Equivalents		-		26,336		-5,588		-		20,748
Cash and Cash Equivalents, Beginning
of Period		-		2,417		32,325		-		34,742
Cash and Cash Equivalents, End of Period	$	-	$	28,753	$	26,737	$	-	$	55,490

Voluntary_Reorganization_Under1

Voluntary Reorganization Under Chapter 11 (Narrative) (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Sep. 02, 2014	Oct. 31, 2012	Feb. 29, 2012	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2008	Jul. 31, 2011
Debt Instrument [Line Items]
Interest due	$33.50
First Priority Notes [Member]
Debt Instrument [Line Items]
Interest rate	12.00%	12.00%	12.00%
Second Priority Notes [Member]
Debt Instrument [Line Items]
Interest rate	12.00%		12.00%
6.5% Convertible Notes [Member]
Debt Instrument [Line Items]
Interest rate	6.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate				7.50%	7.50%	7.50%	7.50%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Interest rate				5.50%	5.50%	5.50%		5.50%

Debtors_Condensed_Combined_Fin2

Debtors Condensed Combined Financial Statements (Debtors Condensed Combined Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Current Assets	$137,589	$164,754
Property and Equipment, Net ($11,466 not subject to amortization)	343,735	469,509
Other Assets	73	72
Total Assets	576,753	734,576
Liabilities Not Subject To Compromise:
Other	64,496	66,077
Liabilities Subject to Compromise	840,900	841,044
Series C Convertible Preferred Stock - Liquidation Preference: $14,800	17,481	17,481
Stockholders' Equity	-886,841	-776,141
Total Liabilities and Stockholders' Equity	576,753	734,576
Property and equipment not subject to amortization	11,466	10,784
Debtors [Member]
Assets
Current Assets	25,592
Property and Equipment, Net ($11,466 not subject to amortization)	30,077
Long-Term Receivables Due from Affiliates	648,801
Investments in Subsidiaries	295,816
Other Assets	9
Total Assets	1,000,295
Liabilities Not Subject To Compromise:
Accrued expenses and other	7,495
Current Liabilities Due to Affiliates	101,386
Other	630
Liabilities Subject to Compromise	840,900
Series C Convertible Preferred Stock - Liquidation Preference: $14,800	17,481
Stockholders' Equity	32,403
Total Liabilities and Stockholders' Equity	1,000,295
Property and equipment not subject to amortization	11,466
Preferred stock liquidation preference	$14,800

Debtors_Condensed_Combined_Fin3

Debtors Condensed Combined Financial Statements (Debtors Condensed Combined Statement Of Operations) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues	$64,329	$94,163
Cost of Operations	164,940	76,987
Income (Loss) From Operations	-100,611	17,176
Other Income (Expense):
Financing and transaction costs	-1,025	-1,816
Reorganization items	-6,866
Other expense	105	-204
Total Other Expense	-22,191	-58,477
Net Loss	-110,661	-44,870
Debtors [Member]
Revenues	1,082
Cost of Operations	11,314
Income (Loss) From Operations	-10,232
Other Income (Expense):
Interest income	15,000
Financing and transaction costs	-58
Reorganization items	-6,866
Other expense	26
Total Other Expense	8,102
Net Loss	($2,130)

Debtors_Condensed_Combined_Fin4

Debtors Condensed Combined Financial Statements (Debtors Condensed Combined Cash Flow) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating	$2,864	$27,549
Investing	-18,216	-29,950
Financing		23,149
Net Increase (Decrease) in Cash and Cash Equivalents	-15,352	20,748
Cash and Cash Equivalents, Beginning of Period	81,850	34,742
Cash and Cash Equivalents, End of Period	66,498	55,490
Debtors [Member]
Operating	36,603
Investing	-52,784
Financing	16
Net Increase (Decrease) in Cash and Cash Equivalents	-16,165
Cash and Cash Equivalents, Beginning of Period	131,656
Cash and Cash Equivalents, End of Period	$115,491

Liabilities_Subject_To_Comprom2

Liabilities Subject To Compromise (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Liabilities Subject To Compromise [Abstract]
Contractual interest not accrued	$21.40

Liabilities_Subject_To_Comprom3

Liabilities Subject To Compromise (Schedule Of Liabilities Subject To Compromise) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt	$790,246	$790,246
Total Liabilities Subject to Compromise	840,900	841,044
Debtors [Member]
Accounts Payable	5,935
Debt	790,246
Accrued Interest and Dividends	44,719
Total Liabilities Subject to Compromise	$840,900

Property_And_Equipment_Narrati

Property And Equipment (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Directly related employee costs capitalized	$2,400,000	$3,100,000
Impairment of oil and gas properties	90,087,000
Average price per barrel, oil	78.58	98.43
Average price per barrel, gas	3.73	3.99
U.K. Activities [Member]
Business Acquisition [Line Items]
Properties not subject to amortization	0
Exploration and development related capitalized costs	0	2,600,000
Average price per barrel, oil	83.49	107.06
Average price per barrel, gas	7.6	10.57
Marcellus Acreage [Member]
Business Acquisition [Line Items]
Properties not subject to amortization	11,500,000	10,800,000
Alba Field [Member] | Loss Of Production Income [Member]
Business Acquisition [Line Items]
Proceeds from insurance claim	8,400,000		13,000,000
Alba Field [Member] | Loss Of Production Income [Member] | Forecast [Member] | Minimum [Member]
Business Acquisition [Line Items]
Proceeds from insurance claim	5,000,000
Alba Field [Member] | Loss Of Production Income [Member] | Forecast [Member] | Maximum [Member]
Business Acquisition [Line Items]
Proceeds from insurance claim	$7,000,000

Property_And_Equipment_Schedul

Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	$927,903	$1,000,542
Computers, Furniture and Fixtures	8,733	8,733
Total Property and Equipment	936,636	1,009,275
Accumulated Depreciation, Depletion and Amortization	-592,901	-539,766
Net Property and Equipment	343,735	469,509
Proved Properties [Member]
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	916,437	989,758
Unproved Properties, Incurred In 2015 [Member]
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	682
Unproved Properties, Incurred In 2014 [Member]
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	945	945
Unproved Properties, Incurred In 2013 [Member]
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	774	774
Unproved Properties, Incurred Prior To 2013 [Member]
Property, Plant and Equipment [Line Items]
Oil and Gas Properties Under the Full Cost Method	$9,065	$9,065

Debt_Obligations_Amended_Term_

Debt Obligations (Amended Term Loan Facility) (Details) (USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Jan. 24, 2014
Amended Term Loan Facility [Member]
Debt Instrument [Line Items]
Number of subsidiaries		2
Credit facility initiation date	24-Jan-14
Debt principal amount			$125,000,000
Amount advanced	$440,000,000	440,000,000
Debt maturity date	2-Jan-17
Discount rate		2.00%
London Interbank Offered Rate (LIBOR) [Member] | Amended Term Loan Facility [Member]
Debt Instrument [Line Items]
LIBOR floor rate		1.00%
London Interbank Offered Rate (LIBOR) [Member] | Monetary Production Payments [Member]
Debt Instrument [Line Items]
Interest rate		10.00%
Minimum [Member] | Amended Term Loan Facility [Member]
Debt Instrument [Line Items]
Asset coverage ratio	1
Maximum [Member] | Amended Term Loan Facility [Member]
Debt Instrument [Line Items]
Leverage ratio	2.75

Debt_Obligations_Senior_Notes_

Debt Obligations (Senior Notes Narrative) (Details) (USD $)	Sep. 02, 2014	Oct. 31, 2012	Feb. 29, 2012
First Priority Notes [Member]
Debt Instrument [Line Items]
Debt principal amount		$54,000,000	$350,000,000
Interest rate	12.00%	12.00%	12.00%
Second Priority Notes [Member]
Debt Instrument [Line Items]
Debt principal amount			$150,000,000
Interest rate	12.00%		12.00%

Debt_Obligations_55_Convertibl

Debt Obligations (5.5% Convertible Senior Notes Narrative) (Details) (Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member], USD $)	1 Months Ended	3 Months Ended
	Jul. 31, 2011	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Debt principal amount	$135,000,000
Interest rate	5.50%	5.50%	5.50%	5.50%
Debt maturity date		15-Jul-16
Conversion rate	0.054019
Conversion price	$18.51

Debt_Obligations_75_Convertibl

Debt Obligations (7.5% Convertible Bonds) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2008	Mar. 31, 2014
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%	7.50%	7.50%
Conversion price	$16.52
Conversion rate	0.061
11.5% Convertible Bonds [Member]
Debt Instrument [Line Items]
Interest rate					11.50%

Debt_Obligations_65_Convertibl

Debt Obligations (6.5% Convertible Senior Notes Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2014	Dec. 31, 2014
Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Credit facility initiation date	28-Feb-14
Value of common stock, warrants and convertible notes issued		$30,000,000
Common stock, shares issued		2.9
Number of common stock shares warrants can be converted into		0.7
Warrants exercise price		$5.29
Warrants expiration date	28-Feb-19
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Debt principal amount		$17,500,000
Interest rate	6.50%	6.50%		6.50%
Conversion rate			0.2145002
Conversion price			$4.66

Debt_Obligations_Fair_Value_Na

Debt Obligations (Fair Value Narrative) (Details) (Fair Value, Inputs, Level 3 [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt obligations outstanding	$446.70	$446.10

Debt_Obligations_Schedule_Of_D

Debt Obligations (Schedule Of Debt) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2011	Jul. 31, 2008	Mar. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	$790,246	$790,246
Liabilities Not Subject to Compromise	605,213	652,192
Total Debt Obligations	1,230,246	1,230,246
Less: Debt Discount	-6,859	-7,819
Less: Liabilities Subject to Compromise	-790,246	-790,246
Less: current maturities	-433,141	-432,181
Senior Notes,12% Fixed Rate, Due 2018 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	554,000	554,000
Less: Liabilities Subject to Compromise	-554,000	-554,000
Interest rate	12.00%	12.00%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	135,000	135,000
Less: Liabilities Subject to Compromise	-135,000	-135,000
Interest rate	5.50%	5.50%	5.50%	5.50%
Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	83,746	83,746
Less: Liabilities Subject to Compromise	-83,746	-83,746
Interest rate	11.50%	11.50%
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%	7.50%		7.50%
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Total Liabilities Subject to Compromise	17,500	17,500
Less: Liabilities Subject to Compromise	-17,500	-17,500
Interest rate	6.50%	6.50%				6.50%
Amended Term Loan Facility, Due 2017 [Member]
Debt Instrument [Line Items]
Liabilities Not Subject to Compromise	$440,000	$440,000

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Operating Loss Carryforwards [Line Items]
U.S. statutory rate		35.00%
Foreign statutory rate	62.00%	50.00%
Deferred tax expense (benefit)		($11,137)	$1,969
Ring Fence Corporation Tax [Member]
Operating Loss Carryforwards [Line Items]
Foreign statutory rate	30.00%
Supplementary Charge [Member]
Operating Loss Carryforwards [Line Items]
Foreign statutory rate	32.00%	20.00%
Deferred tax expense (benefit)		11,400
Petroleum Revenue Tax [Member]
Operating Loss Carryforwards [Line Items]
Foreign statutory rate		50.00%
Deferred tax expense (benefit)		($7,900)
PRT Rate Beginning On January 1, 2016 [Member]
Operating Loss Carryforwards [Line Items]
Foreign statutory rate		35.00%

Other_LongTerm_Liabilities_Sch

Other Long-Term Liabilities (Schedule Of Other Liabilities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Other Long-Term Liabilities [Abstract]
Asset Retirement Obligations	$64,359	$65,935
Other	137	142
Total Other Liabilities	$64,496	$66,077

Other_LongTerm_Liabilities_Sch1

Other Long-Term Liabilities (Schedule Of Asset Retirement Obligations) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Long-Term Liabilities [Abstract]
Carrying amount of asset retirement obligations as of beginning of period	$106,482
Accretion expense (included in DD&A expense)	3,425
Impact of foreign currency exchange rate changes	-5,014
Payment of asset retirement obligations	-10,699
Carrying amount of asset retirement obligations, as of end of period	94,194
Less: Current portion of asset retirement obligations	-29,835	-40,547
Long-term asset retirement obligations	$64,359	$65,935

Equity_Transactions_Narrative_

Equity Transactions (Narrative) (Details) (Securities Purchase Agreement [Member], USD $)	1 Months Ended	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Feb. 28, 2014	Mar. 31, 2015
Securities Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Common stock, shares issued	2.9
Number of common stock shares warrants can be converted into	0.7
Value of common stock issued	$12.50
Warrants exercise price	$5.29
Warrants expiration date		28-Feb-19

StockBased_Compensation_Arrang2

Stock-Based Compensation Arrangements (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Vesting period	3 years
Compensation cost related to awards not yet recognized.	$3.40
Performance period	3 years
Maximum [Member]
Unrecognized compensation cost, recognition period	2 years
Range Of Shares Percent	200.00%
Minimum [Member]
Range Of Shares Percent	0.00%

StockBased_Compensation_Arrang3

Stock-Based Compensation Arrangements (Schedule Of General And Administrative Expenses) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total non-cash stock-based compensation	($39)	$1,134
G&A Expenses [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
G&A Expenses (Income)	-10	971
Capitalized G&A [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
G&A Expenses (Income)	($29)	$163

StockBased_Compensation_Arrang4

Stock-Based Compensation Arrangements (Schedule Of Outstanding Stock Options) (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Stock-Based Compensation Arrangements [Abstract]
Balance outstanding, Number of Shares Underlying Options	107
Expired, Number of Shares Underlying Options	-87
Balance outstanding, Number of Shares Underlying Options	20
Currently exercisable, Number of Shares Underlying Options	20
Balance outstanding, Weighted Average Exercise Price per Share	$7.76
Expired, Weighted Average Exercise Price per Share	$8.21
Balance outstanding, Weighted Average Exercise Price per Share	$5.83
Currently exercisable, Weighted Average Exercise Price per Share	$5.83
Balance outstanding, Weighted Average Contractual Life in Years	3 years 4 months 24 days
Currently exercisable, Weighted Average Contractual Life in Years	3 years 4 months 24 days

StockBased_Compensation_Arrang5

Stock-Based Compensation Arrangements (Schedule Of Restricted Shares Granted) (Details) (Restricted Stock [Member], USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance outstanding, Number of Shares	740
Vested, Number of Shares	-245
Forfeited, Number of Shares	-27
Balance outstanding, Number of Shares	468
Total grant date fair value of shares vesting during the period	$38.30
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$4.93
Vested, Weighted Average Grant Date Fair Value per Share	$5.90
Forfeited, Weighted Average Grant Date Fair Value per Share	$5.69
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$4.40

StockBased_Compensation_Arrang6

Stock-Based Compensation Arrangements (Schedule Of Performance-Based Share Awards) (Details) (Performance Shares [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance outstanding, Number of Shares	424
Forfeited, Number of Shares	-26
Balance outstanding, Number of Shares	398
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$8.05
Forfeited, Weighted Average Grant Date Fair Value per Share	$7.91
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$8.05

Loss_Per_Share_Schedule_Of_Com

Loss Per Share (Schedule Of Common Shares Potentially Issuable) (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares potentially issuable	28,024	29,217
Warrants, Options And Stock-Based Compensation [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares potentially issuable	10,216	9,055
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares potentially issuable	16,117	15,933
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares potentially issuable	1,691	4,229

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Schedule Of Supplemental Cash Flow Information) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest paid	$12,100	$47,814
Income taxes paid (refunded), all related to PRT	13,834	-14,002
Reorganization items paid	$6,805

Commitments_And_Contingencies_

Commitments And Contingencies (LC Issuance Agreement) (Details)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Sep. 30, 2014
	USD ($)	USD ($)	LC Issuance Agreement [Member]	LC Issuance Agreement [Member]	LC Issuance Agreement [Member]	LC Issuance Agreement [Member]	LC Issuance Agreement [Member]	Amended Term Loan Facility [Member]	Amended Term Loan Facility [Member]
			USD ($)	GBP (£)	Alba [Member]	IVRRH [Member]	Renee And Rubie [Member]	USD ($)	USD ($)
					GBP (£)	GBP (£)	GBP (£)
Line of Credit Facility [Line Items]
Letters of credit amount				£ 63,100,000	£ 42,500,000	£ 11,900,000	£ 8,700,000
Restricted Cash, Long-Term Portion	95,356,000	100,241,000	95,400,000
Amount advanced								$440,000,000	$440,000,000

Commitments_And_Contingencies_1

Commitments And Contingencies (Combined Procurement Agreement) (Details) (Combined Procurement Agreement [Member])	0 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jan. 24, 2014	Jan. 24, 2014
	USD ($)	GBP (£)	London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Maximum credit amount		£ 78
Basis spread on variable rate			7.00%
Interest rate			1.25%
Repayment of outstanding interest	1.9
Repayment of outstanding fees	$2.40

Commitments_And_Contingencies_2

Commitments And Contingencies (Terminated Acquisition Of Marcellus Assets) (Details) (USD $)	3 Months Ended	0 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Apr. 16, 2014
Loss Contingencies [Line Items]
Litigation settlement expense	$19,034,000
SM Energy Litigation [Member]
Loss Contingencies [Line Items]
Amount of deposit forfeited		6,000,000
Settlement amount		5,000,000
Note issuance amount		$4,500,000
Number of common stock shares warrants can be converted into		2.1
Warrants exercise price		$5.29

Commitments_And_Contingencies_3

Commitments And Contingencies (Claim By Mr. William Transier) (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Dec. 16, 2014	Dec. 16, 2014
Commitments And Contingencies [Abstract]
Litigation amount	$6.20
Annual bonus amount		0.7
Severance claim amount	$5.50

Guarantor_Subsidiaries_Balance

Guarantor Subsidiaries (Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$66,498	$81,850	$55,490	$34,742
Accounts receivable	34,270	35,507
Prepaid expenses and other	36,821	47,397
Current Assets	137,589	164,754
Property, plant and equipment, net	343,735	469,509
Restricted cash, long-term portion	95,356	100,241
Other assets	73	72
Total Assets	576,753	734,576
Accounts payable	32,697	27,364
Current maturities of debt	433,141	432,181
Deferred revenue	594	14,157
Asset retirement obligations, current portion	29,835	40,547
Accrued expenses and other	5,332	15,196
Current Liabilities	501,599	529,445
Deferred taxes	39,118	56,670
Other liabilities	64,496	66,077
Total Liabilities Not Subject to Compromise	605,213	652,192
Liabilities Subject to Compromise	840,900	841,044
Series C convertible preferred stock	17,481	17,481
Stockholder's equity (deficit)	-886,841	-776,141
Total Liabilities and Equity	576,753	734,576
Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Current receivables due from affiliates	-662,460	-634,610
Current Assets	-662,460	-634,610
Long-term receivables due from affiliates	-1,054,000	-1,054,000
Investments in subsidiaries	-276,720	-276,720
Total Assets	-1,993,180	-1,965,330
Current liabilities due to affiliates	-662,460	-634,610
Current Liabilities	-662,460	-634,610
Long-term liabilities due to affiliates	-1,054,000	-1,054,000
Total Liabilities Not Subject to Compromise	-1,716,460	-1,688,610
Stockholder's equity (deficit)	-276,720	-276,720
Total Liabilities and Equity	-1,993,180	-1,965,330
Endeavour International Corporation [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Current receivables due from affiliates	494,133	477,351
Current Assets	494,133	477,351
Long-term receivables due from affiliates	554,000	554,000
Investments in subsidiaries	57,662	57,662
Total Assets	1,105,795	1,089,013
Current liabilities due to affiliates	648	648
Accrued expenses and other	621	385
Current Liabilities	1,269	1,033
Other liabilities	-3	1
Total Liabilities Not Subject to Compromise	1,266	1,034
Liabilities Subject to Compromise	751,221	751,219
Series C convertible preferred stock	17,481	17,481
Stockholder's equity (deficit)	335,827	319,279
Total Liabilities and Equity	1,105,795	1,089,013
Combined Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	17,515	32,055	28,753	2,417
Accounts receivable	2,187	2,427
Current receivables due from affiliates	68,055	53,174
Prepaid expenses and other	5,881	7,350
Current Assets	93,638	95,006
Property, plant and equipment, net	30,077	35,529
Long-term receivables due from affiliates	500,000	500,000
Investments in subsidiaries	219,058	219,058
Other assets	11	10
Total Assets	842,784	849,603
Accounts payable	2,833	2,065
Current liabilities due to affiliates	594,376	581,402
Asset retirement obligations, current portion	41	42
Accrued expenses and other	3,946	5,663
Current Liabilities	601,196	589,172
Long-term liabilities due to affiliates	554,000	554,000
Other liabilities	449	436
Total Liabilities Not Subject to Compromise	1,155,645	1,143,608
Liabilities Subject to Compromise	5,933	6,079
Stockholder's equity (deficit)	-318,794	-300,084
Total Liabilities and Equity	842,784	849,603
Combined Non- Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	48,983	49,795	26,737	32,325
Accounts receivable	32,083	33,080
Current receivables due from affiliates	100,272	104,085
Prepaid expenses and other	30,940	40,047
Current Assets	212,278	227,007
Property, plant and equipment, net	313,658	433,980
Restricted cash, long-term portion	95,356	100,241
Other assets	62	62
Total Assets	621,354	761,290
Accounts payable	29,864	25,299
Current maturities of debt	433,141	432,181
Deferred revenue	594	14,157
Current liabilities due to affiliates	67,436	52,560
Asset retirement obligations, current portion	29,794	40,505
Accrued expenses and other	765	9,148
Current Liabilities	561,594	573,850
Long-term liabilities due to affiliates	500,000	500,000
Deferred taxes	39,118	56,670
Other liabilities	64,050	65,640
Total Liabilities Not Subject to Compromise	1,164,762	1,196,160
Liabilities Subject to Compromise	83,746	83,746
Stockholder's equity (deficit)	-627,154	-518,616
Total Liabilities and Equity	$621,354	$761,290

Guarantor_Subsidiaries_Income_

Guarantor Subsidiaries (Income Statement) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Income Statements, Captions [Line Items]
Revenue	$64,329	$94,163
Operating expenses	24,145	27,170
DD&A expense	56,561	44,968
Impairment of oil and gas properties	90,087
Insurance proceeds	-8,425
G&A expenses	2,572	4,849
Income (Loss) From Operations	-100,611	17,176
Unrealized gains on derivatives		2,659
Interest expense	-14,351	-31,477
Letter of credit fees	-58	-3,789
Financing and transaction costs	-1,025	-1,816
Reorganization items	-6,866
Loss on early extinguishment of financing agreements		-3,543
Litigation settlement expense		-19,034
Unrealized foreign currency gains (losses)	4	-1,273
Other income (expense)	105	-204
Income (Loss) Before Income Taxes	-122,802	-41,301
Petroleum Revenue Tax ("PRT") Benefit	-12,141	1,725
Corporate Tax Expense (Benefit)		1,844
Total tax benefit	-12,141	3,569
Net income (loss)	-110,661	-44,870
Preferred Stock Dividends		456
Net income (loss) to common shareholders	-110,661	-45,326
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest expense	31,620	31,620
Other income (expense)	-31,620	-31,620
Endeavour International Corporation [Member]
Condensed Income Statements, Captions [Line Items]
G&A expenses	33	995
Income (Loss) From Operations	-33	-995
Unrealized gains on derivatives		469
Interest expense		-20,620
Financing and transaction costs		-323
Other income (expense)	16,620	16,621
Income (Loss) Before Income Taxes	16,587	-4,848
Net income (loss)	16,587	-4,848
Preferred Stock Dividends		456
Net income (loss) to common shareholders	16,587	-5,304
Combined Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	1,083	1,947
Operating expenses	1,289	1,181
DD&A expense	562	721
Impairment of oil and gas properties	10,078
G&A expenses	-649	3,709
Income (Loss) From Operations	-10,197	-3,664
Interest expense	-16,620	-16,042
Financing and transaction costs	-45	-590
Reorganization items	-6,866
Litigation settlement expense		-19,034
Other income (expense)	15,018	14,996
Income (Loss) Before Income Taxes	-18,710	-24,334
Net income (loss)	-18,710	-24,334
Net income (loss) to common shareholders	-18,710	-24,334
Combined Non- Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	63,246	92,216
Operating expenses	22,856	25,989
DD&A expense	55,999	44,247
Impairment of oil and gas properties	80,009
Insurance proceeds	-8,425
G&A expenses	3,188	145
Income (Loss) From Operations	-90,381	21,835
Unrealized gains on derivatives		2,190
Interest expense	-29,351	-26,435
Letter of credit fees	-58	-3,789
Financing and transaction costs	-980	-903
Loss on early extinguishment of financing agreements		-3,543
Unrealized foreign currency gains (losses)	4	-1,273
Other income (expense)	87	-201
Income (Loss) Before Income Taxes	-120,679	-12,119
Petroleum Revenue Tax ("PRT") Benefit	-12,141	1,725
Corporate Tax Expense (Benefit)		1,844
Total tax benefit	-12,141	3,569
Net income (loss)	-108,538	-15,688
Net income (loss) to common shareholders	($108,538)	($15,688)

Guarantor_Subsidiaries_Cash_Fl

Guarantor Subsidiaries (Cash Flow Statement) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net loss	($110,661)	($44,870)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	56,561	44,968
Impairment of oil and gas properties	90,087
Deferred tax expense (benefit)	-11,137	1,969
Unrealized (gains) losses on derivatives		-2,659
Amortization of non-cash compensation	-10	971
Amortization of loan costs and discount	2,238	6,705
Non-cash interest expense		1,883
Loss on early extinguishment of debt		6,856
Litigation settlement expense		19,034
Other	-5,017	1,847
Changes in operating assets and liabilities:
(Increase) decrease in receivables	1,237	19,001
(Increase) decrease in other current assets	2,624	-5,056
Increase (decrease) in liabilities	-23,058	-23,100
Net Cash Provided by (Used in) Operating Activities	2,864	27,549
Cash Flows From Investing Activities:
Capital expenditures	-23,101	-28,845
Proceeds from sale of oil and gas interests		1,352
Increase in restricted cash	4,885	-2,457
Net Cash Used in Investing Activities	-18,216	-29,950
Cash Flows From Financing Activities:
Repayments of borrowings		-115,163
Borrowings under debt agreements, net of debt discount		140,625
Proceeds from issuance of common stock		12,376
Repayments of MPP		-5,000
Financing costs paid		-9,273
Other financing		-416
Net Cash Provided by (Used in) Financing Activities		23,149
Net Change in Cash and Cash Equivalents	-15,352	20,748
Cash and Cash Equivalents, Beginning of Period	81,850	34,742
Cash and Cash Equivalents, End of Period	66,498	55,490
Eliminations [Member]
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of non-cash compensation	-10	809
Changes in operating assets and liabilities:
Increase (decrease) in liabilities		-2,385
Net Cash Provided by (Used in) Operating Activities	-10	-1,576
Cash Flows From Investing Activities:
Capital expenditures	622	1,576
Net Cash Used in Investing Activities	622	1,576
Cash Flows From Financing Activities:
Intercompany cash management	-612
Net Cash Provided by (Used in) Financing Activities	-612
Endeavour International Corporation [Member]
Cash Flows from Operating Activities:
Net loss	16,587	-4,848
Adjustments to reconcile net loss to net cash provided by operating activities:
Unrealized (gains) losses on derivatives		-469
Amortization of non-cash compensation		162
Amortization of loan costs and discount		2,049
Other	-39
Changes in operating assets and liabilities:
Increase (decrease) in liabilities	236	-17,438
Net Cash Provided by (Used in) Operating Activities	16,784	-20,544
Cash Flows From Financing Activities:
Borrowings under debt agreements, net of debt discount		17,500
Proceeds from issuance of common stock		12,376
Financing costs paid		-456
Intercompany cash management	-16,784	-8,460
Other financing		-416
Net Cash Provided by (Used in) Financing Activities	-16,784	20,544
Combined Guarantor Subsidiaries [Member]
Cash Flows from Operating Activities:
Net loss	-18,710	-24,334
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	562	721
Impairment of oil and gas properties	10,078
Litigation settlement expense		19,034
Other	6,338	-4
Changes in operating assets and liabilities:
(Increase) decrease in receivables	240	-852
(Increase) decrease in other current assets	-17,219	-238
Increase (decrease) in liabilities	-7,399	20,381
Net Cash Provided by (Used in) Operating Activities	-26,110	14,708
Cash Flows From Investing Activities:
Capital expenditures	-5,826	-15,328
Proceeds from sale of oil and gas interests		1,352
Net Cash Used in Investing Activities	-5,826	-13,976
Cash Flows From Financing Activities:
Intercompany cash management	17,396	25,604
Net Cash Provided by (Used in) Financing Activities	17,396	25,604
Net Change in Cash and Cash Equivalents	-14,540	26,336
Cash and Cash Equivalents, Beginning of Period	32,055	2,417
Cash and Cash Equivalents, End of Period	17,515	28,753
Combined Non- Guarantor Subsidiaries [Member]
Cash Flows from Operating Activities:
Net loss	-108,538	-15,688
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	55,999	44,247
Impairment of oil and gas properties	80,009
Deferred tax expense (benefit)	-11,137	1,969
Unrealized (gains) losses on derivatives		-2,190
Amortization of loan costs and discount	2,238	4,656
Non-cash interest expense		1,883
Loss on early extinguishment of debt		6,856
Other	-11,316	1,851
Changes in operating assets and liabilities:
(Increase) decrease in receivables	997	19,853
(Increase) decrease in other current assets	19,843	-4,818
Increase (decrease) in liabilities	-15,895	-23,658
Net Cash Provided by (Used in) Operating Activities	12,200	34,961
Cash Flows From Investing Activities:
Capital expenditures	-17,897	-15,093
Increase in restricted cash	4,885	-2,457
Net Cash Used in Investing Activities	-13,012	-17,550
Cash Flows From Financing Activities:
Repayments of borrowings		-115,163
Borrowings under debt agreements, net of debt discount		123,125
Repayments of MPP		-5,000
Financing costs paid		-8,817
Intercompany cash management		-17,144
Net Cash Provided by (Used in) Financing Activities		-22,999
Net Change in Cash and Cash Equivalents	-812	-5,588
Cash and Cash Equivalents, Beginning of Period	49,795	32,325
Cash and Cash Equivalents, End of Period	$48,983	$26,737