Endeavour International 10-Q 9 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	7-May-14
Document And Entity Information [Abstract]	'	'
Document type	'10-Q	'
Document period end date	31-Mar-14	'
Amendment flag	'false	'
Document Fiscal Period Focus	'Q1	'
Document Fiscal Year Focus	'2014	'
Current fiscal year end date	'--12-31	'
Entity central index key	'0001112412	'
Entity filer category	'Accelerated Filer	'
Entity registrant name	'Endeavour International Corporation	'
Entity Common Stock, Shares Outstanding	'	50.3

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$55,490	$34,742
Accounts receivable	48,217	65,171
Prepaid expenses and other current assets	82,896	60,318
Total Current Assets	186,603	160,231
Property and Equipment, Net ($370,815 and $368,660 not subject to amortization at March 31, 2014 and December 31, 2013, respectively)	1,053,775	1,072,151
Goodwill	259,238	259,238
Other Assets	32,997	33,222
Total Assets	1,532,613	1,524,842
Current Liabilities:	'	'
Accounts payable	56,199	38,033
Current maturities of debt	2,140	'
Deferred revenue	2,152	20,965
Monetary production payment, current portion	120,833	74,167
Accrued expenses and other	79,219	88,625
Total Current Liabilities	260,543	221,790
Long-Term Debt	891,829	870,878
Deferred Taxes	173,847	146,213
Monetary production payment, long-term portion	40,833	92,500
Other Liabilities	127,789	131,370
Total Liabilities	1,494,841	1,462,751
Commitments and Contingencies	'	'
Series C Convertible Preferred Stock:	'	'
Series C preferred stock: Liquidation preference - $37,000 and $37,000 at March 31, 2014 and December 31, 2013, respectively	43,703	43,703
Stockholders Equity:	'	'
Common stock; shares issued and outstanding - 50,395 and 46,981 shares at March 31, 2014 and December 31, 2013, respectively	50	47
Additional paid-in capital	531,066	510,062
Treasury stock, at cost - 72 and 72 shares at March 31, 2014 and December 13, 2013, respectively	-587	-587
Accumulated deficit	-536,460	-491,134
Total Stockholders' Equity	-5,931	18,388
Total Liabilities and Stockholders' Equity	1,532,613	1,524,842
Series C Preferred Stock [Member]	'	'
Series C Convertible Preferred Stock:	'	'
Series C preferred stock: Liquidation preference - $37,000 and $37,000 at March 31, 2014 and December 31, 2013, respectively	43,703	43,703
Series B Preferred Stock [Member]	'	'
Stockholders Equity:	'	'
Series B preferred stock - Liquidation preference: $3,785 and $3,745 at March 31, 2014 and December 31, 2013, respectively	'	'

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parentheticals) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Property and equipment not subject to amortization	$370,815	$368,660
Common stock shares issued	50,395,000	46,981,000
Common stock shares outstanding	50,395,000	46,981,000
Treasury Stock	72,000	72,000
Series C Preferred Stock [Member]	'	'
Preferred stock liquidation preference	37,000	37,000
Series B Preferred Stock [Member]	'	'
Preferred stock liquidation preference	$3,785	$3,745

Condensed_Consolidated_Stateme

Condensed Consolidated Statement of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statement of Operations	'	'
Revenues	$94,163	$57,672
Cost of Operations:	'	'
Operating expenses	27,170	17,490
Depreciation, depletion and amortization	44,968	22,947
Impairment of oil and gas properties	'	3,534
General and administrative	4,849	5,482
Total Expenses	76,987	49,453
Income (loss) From Operations	17,176	8,219
Other Income (Expense):	'	'
Unrealized gains on derivatives	2,659	1,580
Interest expense	-31,477	-21,438
Letter of credit fees	-3,789	-11,380
Loss on early extinguishment of financing agreements	-3,543	'
Litigation settlement expense	-19,034	'
Unrealized gain (loss) on foreign currency exchange	-1,273	9,760
Other income (expense)	-2,020	122
Total Other Expense	-58,477	-21,356
Loss Before Income Taxes	-41,301	-13,137
Petroleum Revenue Tax ("PRT") Expense	1,725	628
Corporate Tax Expense	1,844	281
Total Tax Expense	3,569	909
Net Loss	-44,870	-14,046
Preferred Stock Dividends	456	456
Net Loss to Common Stockholders	($45,326)	($14,502)
Net Loss per Common Share:	'	'
Basic and Diluted	($0.91)	($0.31)
Weighted Average Number of Common Shares Outstanding:	'	'
Basic and Diluted	49,590	47,060

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:	'	'
Net loss	($44,870)	($14,046)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	44,968	22,947
Impairment of oil and gas properties	'	3,534
Deferred tax expense	1,969	128
Unrealized gains on derivatives	-2,659	-1,580
Amortization of non-cash compensation	971	832
Amortization of loan costs and discount	6,705	3,439
Non-cash interest expense	1,883	2,274
Loss on early extinguishment of financing agreements	6,856	'
Litigation settlement expense	19,034	'
Other	1,847	-4,723
Changes in operating assets and liabilities:	'	'
Decrease in receivables	19,001	15,829
Increase in other current assets	-5,056	-11,359
Increase (decrease) in liabilities	-23,100	30,330
Net Cash Provided by Operating Activities	27,549	47,605
Cash Flows From Investing Activities:	'	'
Capital expenditures	-28,845	-59,074
Proceeds from sales, net of cash	1,352	'
Increase in restricted cash	-2,457	'
Net Cash Used in Investing Activities	-29,950	-59,074
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	'
Proceeds from issuance of monetary production payment	'	43,000
Repayments of monetary production payment	-5,000	'
Financing costs paid	-9,273	-9,935
Other financing	-416	'
Net Cash Provided by Financing Activities	23,149	33,065
Net Increase in Cash and Cash Equivalents	20,748	21,596
Cash and Cash Equivalents, Beginning of Period	34,742	59,185
Cash and Cash Equivalents, End of Period	$55,490	$80,781

General

General	3 Months Ended
	Mar. 31, 2014
General 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, 2013.
	2014 Liquidity and Capital Resources
	As of March 31, 2014, we had $912.2 million in outstanding indebtedness.  Being highly leveraged, servicing our debt and other long-term obligations will continue to require a significant portion of our cash flow from operations and available cash on hand.  The combination of these debt servicing requirements, capital expenditures and the delay in cash flow resulting from the Rochelle mechanical issues may exceed the cash flow from our current operations.  During 2014, our primary uses of financial resources are expected to be:
		·	our capital expenditures, primarily related to our drilling activities in the U.K.;
		·	payments for abandonment obligations,
		·	payments due under our production payments; and
		·	interest payments on outstanding indebtedness and payments in support of our reimbursement agreement covering our abandonment obligations.
	Since year-end 2013, we have also completed several transactions to improve our liquidity position and extend the maturities of some of our debt and other obligations.  These recent financing activities are designed in part to provide sufficient liquidity to replace the interruption in production at Rochelle that occurred in the first and second quarter of 2014.  These transactions include:
		·	replacing certain credit facilities which would have expired in 2014;
		·	replacing reimbursement agreements covering certain of our abandonment liabilities in the U.K. which would have expired in 2014;
		·	issuing $12.5 million in common stock and warrants; and
		·	issuing $17.5 million in 6.5% convertible debt.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
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 (“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. 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.
	These accounting principles require 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;
		·	estimates of future dismantlement and restoration costs;
		·	estimates of fair values used in purchase accounting; and
		·	estimates of the fair value of derivative instruments.

Property_And_Equipment

Property And Equipment	3 Months Ended
	Mar. 31, 2014
Property and Equipment [Abstract]	'
Property And Equipment	'
	Note 3 –  Property and Equipment
	Property and equipment included the following at the dates indicated below:
			March 31,			December 31,
			2014			2013
	Oil and gas properties under the full cost method:
	Subject to amortization	$	1,102,962		$	1,084,669
	Not subject to amortization:
	Incurred in 2014		23,041			-
	Incurred in 2013		37,936			52,748
	Incurred in 2012		134,287			138,641
	Incurred prior to 2012		175,551			177,271
			1,473,777			1,453,329
	Computers, furniture and fixtures		8,733			8,734
	Total property and equipment		1,482,510			1,462,063
	Accumulated depreciation, depletion and amortization		-428,735			-389,912
	Net property and equipment	$	1,053,775		$	1,072,151
	The costs not subject to amortization include:
		·		values assigned to unproved reserves acquired;
		·		exploration costs such as drilling costs for projects awaiting approved development plans or the determination of whether or not proved reserves can be assigned; and
		·		other seismic and geological and geophysical costs.
	These costs are 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, results of infield drilling, approval of development plans, drilling results and development of identified projects and periodic assessment of reserves.  We expect acquisition costs and exploration costs excluded from amortization to be transferred to the amortization base over the next three years due to a combination of well performance and results of infield drilling relating to currently producing assets and the drilling and development of identified projects, such as the Rochelle field.  Because of the nature of offshore oil and gas activities, development activities, including sanctioning and regulatory approvals, may take a significant amount of time to implement.  Even though our expectation is that most costs not subject to amortization are to be transferred to the amortization base over the next two years, it is not uncommon for the cycle times to be longer.  We have one U.K. field, Columbus, where costs have been excluded from amortization for greater than five years; however, we continue to work on the development planning for the field.
	For the three months ended March 31, 2014 and 2013, we capitalized $2.6 million and $6.2 million, respectively, in interest related to exploration and development, primarily related to our U.K. activities.  For the three months ended March 31, 2014 and 2013, we capitalized $3.1 million and $5.1 million, respectively, in certain directly related employee costs.
	We did not have an impairment of U.S.  oil and gas properties through the application of the full cost ceiling test at the end of the first quarter of 2014, which utilized prices of $98.43 per barrel for oil and $3.99 per Mcf for gas.  We did not have an impairment of U.K. oil and gas properties through the application of the full cost ceiling test at the end of the first quarter of 2014, which utilized prices of $107.06 per barrel for oil and $10.57 per Mcf for gas.
	For the  first quarter of 2013, we recorded a pre-tax impairment of $3.5 million related to our U.S. oil and gas properties through the application of the full cost ceiling test at the end of the quarter.  The prices used to determine the impairment for our U.S. properties were $92.63 per barrel for oil and $2.97 per Mcf for gas. We did not have an impairment of U.K. oil and gas properties through the application of the full cost ceiling test at the end of the first quarter of 2013, which utilized prices of $110.49 per barrel for oil and $9.71 per Mcf for gas.

Deferred_Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2014
Deferred Revenue [Abstract]	'
Deferred Revenue	'
	Note 4 – 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.
	In 2013, we entered into two separate forward sale agreements with one of our established purchasers for payments of approximately $22.5 million each.  This effectively hedged a portion of production from our U.K. North Sea assets by locking in pricing for in excess of 200,000 barrels of oil, over a six month delivery period.  Payment for these agreements was received in the first and third quarters of 2013.  The first forward sale commitment was fulfilled in June 2013 and the second forward sale commitment was fulfilled at the end of the first quarter of 2014.  The forward sale liabilities were included in deferred revenue until the purchaser took possession of the product.

Debt_Obligations

Debt Obligations	3 Months Ended
	Mar. 31, 2014
Debt Obligations [Abstract]	'
Debt Obligations	'
	Note 5 – Debt Obligations
	At March 31, 2014, we had $912.2 million in outstanding debt.  Our debt consisted of the following at March 31, 2014 and December 31, 2013:
			March 31,			December 31,
			2014			2013
	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 senior notes, 6.5% fixed rate, due 2017		17,500			-
	Term loan facility, variable rate, due 2017		125,000			-
	Revolving credit facility, 13% fixed rate, due 2014		-			115,163
	Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016		80,692			78,437
			912,192			882,600
	Less:  debt discount, net of premium		-18,223			-11,722
	Less:  current maturities		-2,140			-
	Long-term debt	$	891,829		$	870,878
	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.  In October 2012, we completed a private placement of an additional $54 million aggregate principal amount of 12% first priority notes due 2018 (collectively, the “2018 Notes”).
	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.
	6.5% Convertible Senior Notes
	On February 28, 2014, we entered into a securities purchase agreement  (the “Securities Purchase Agreement”) relating to the issuance of up to $55 million in common stock, warrants and convertible notes.  We closed on an initial $30 million in late February and early March 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 (the “6.5% Convertible Notes).”
	The purchasers also have a 90-day option (the “Purchasers’ Option”) to purchase up to $25,000,000 of additional common stock, warrants and convertible debt on the same terms as the initial issuance, subject to certain limitations.
	The 6.5% Convertible Notes will mature one day following the earlier of (i) November 30, 2017 and (ii) the date 91 days prior to the maturity date of our outstanding 5.5% Convertible Senior Notes due 2016 and our 11.5% Convertible Bonds due 2016, if such securities have not been converted, cancelled or extinguished prior to such date or extended or refinanced in full prior to such date with a resulting maturity date not earlier than March 1, 2018.  Interest is payable on the 6.5% Convertible Notes quarterly, commencing on June 1, 2014.  The notes are subject to customary events of default.
	The 6.5% Convertible Notes are:
		·		convertible at any time;
		·		convertible initially at a rate 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);
		·		subject to certain anti-dilution adjustments;
		·		general unsecured and unsubordinated obligations; and
		·		equally ranked in right of payment with all of our existing and future unsubordinated indebtedness and senior in right of payment to any of our future indebtedness that is expressly subordinated to the 6.5% Convertible Notes.
	Term Loan Facility
	On January 24, 2014, we entered into a $255 million agreement consisting of a  $125 million senior secured first lien term loan facility (“Term Loan Facility”) and a $130 million Combined Procurement Agreement.  The proceeds of the Term Loan Facility were used to repay the outstanding amounts under our Revolving Credit Facility.  The repayment included a prepayment fee and accrued interest of approximately $2.0 million.  Subsequent to the repayment, the Revolving Credit Facility was terminated, all of the associated liens on our collateral obligations were released, and we recorded a loss of $3.5 million on the early extinguishment of financing agreements.
	The Term Loan Facility bears quarterly interest of LIBOR plus 7.00% annually (provided LIBOR equals at least 1.25% annually) and will mature on the earlier of (a) November 30, 2017 and (b) the date 91 days prior to the maturity of our 5.5% convertible senior notes due 2016 and our 11.5% convertible notes due 2016, provided the notes have not been converted, cancelled, extinguished, extended or refinanced prior to that date with a maturity date prior to March 1, 2018.
	Borrowings under the Term Loan Facility are unconditionally guaranteed by us and each of our current and future restricted subsidiaries.  The credit agreement contains covenants and provisions with respect to events of default that are substantially similar to the covenants in the indentures governing our 2018 Notes including, but not limited to, restrictions on our ability to: (i) pay distributions or repurchase or redeem our 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 our assets; (vii) enter into agreements that restrict distributions from our restricted subsidiaries to the Company; (viii) engage in transactions with affiliates; and (ix) create unrestricted subsidiaries.  In addition, the Term Loan Facility contains various financial and technical covenants, including:
		·		a minimum interest coverage ratio of 1.50:1.0;
		·		a maximum leverage ratio of 5.0:1.0; and
		·		a minimum asset coverage ratio of 2.0:1.0.
	Revolving Credit Facility
	On April 12, 2012, we entered into a Revolving Credit Facility, with Cyan Partners, LP, as administrative agent, under which we ultimately borrowed $115 million.
	On January 24, 2014, we repaid the balance outstanding under the Revolving Credit Facility with proceeds from the Term Loan Facility.  Following the repayment, the Revolving Credit Facility was terminated and all of the associated liens on the collateral securing our obligations were released.
	11.5% Convertible Bonds
	Our 11.5% Convertible Bonds 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.
	Fair Value
	The fair value of our outstanding debt obligations was $804.2 million and $868.4 million at March 31, 2014 and December 31, 2013, respectively.  The fair values of long-term debt were determined based upon external market quotes for our 2018 Notes and 5.5% Convertible Senior Notes and discounted cash flows for other debt, which results in a Level 3 fair-value measurement.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	Note 6 – 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.
	Our income tax expense relates primarily to our operations in the U.K. which are taxed at a statutory rate of 62% plus an additional Petroleum Revenue Tax on our Alba field.  The current tax expense is related to Petroleum Revenue Tax on our Alba field.

Monetary_Production_Payment

Monetary Production Payment	3 Months Ended
	Mar. 31, 2014
Monetary Production Payment [Abstract]	'
Monetary Production Payment	'
	Note 7 – Monetary Production Payment
	Our monetary production payment liability, net of repayments, consisted of the following at March 31, 2014 and December 31, 2013:
			March 31,			December 31,
			2014			2013
	Monetary production payment	$	161,666		$	166,667
	Less:  current portion		-120,833			-74,167
	Long-term monetary production payment	$	40,833		$	92,500
	During 2013, we entered into various monetary production payment arrangements (collectively, the “Monetary Production Payments”) covering the proceeds of sale from a portion of EEUK’s entitlement to production from its interests in the certain fields located in the U.K. sector of the North Sea.  Pursuant to the Monetary Production Payments, our obligations are repayable only out of production and will cease upon the earlier of the repayment of amounts outstanding or production from the applicable licences permanently ceasing.  We issued the Monetary Production Payments in the following manner:
		·		In March through May 2013, a total of $125.0 million, with an effective interest rate of 10.0%, associated with production from our interests in the Alba and Bacchus fields;
		·		In August 2013, $25 million, with an effective interest rate of 8.75%, associated with production from our interests in the Alba and Bacchus fields; and
		·		In December 2013, $25 million, with an effective interest rate of 9.75%, associated with production from our interests in the Rochelle field.
	Principal and interest payments are payable within 20 days after the end of each calendar quarter.  In January 2014, we made a principal payment of $5.0 million and payments for the next three quarters are expected to be $5.8 million each.  In January and April 2015, the principal payments will be $51.7 million each.  The final three payments range from $10 million to $18 million, with the final payment to be made in January 2016.
	Our obligations under the Monetary Production Payments are secured by first priority liens over our interests in the applicable license and related joint operating agreements and sales proceeds accounts.  Our obligations are also secured by second priority liens over certain of our other licenses, joint operating agreements and assets which are pari passu with the liens securing the Term Loan facility and the Combined Procurement Agreement.

Other_LongTerm_Liabilities

Other Long-Term Liabilities	3 Months Ended
	Mar. 31, 2014
Other Long-Term Liabilities [Abstract]	'
Other Long-Term Liabilities	'
	Note 8 – Other Long-Term Liabilities
	At March 31, 2014 and December 31, 2013, our other liabilities included the following:
			March 31,		December 31,
			2014		2013
	Asset retirement obligations	$	115,550	$	121,534
	Long-term derivative liabilities		7,586		9,245
	Other		4,653		591
	Total Other Liabilities	$	127,789	$	131,370
	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, 2014 and 2013:
			Three Months Ended
			March 31,
			2014		2013
	Carrying amount of asset retirement obligations as of beginning of period	$	170,429	$	176,076
	Accretion expense (included in DD&A expense)		6,145		5,521
	Impact of foreign currency exchange rate changes		1,370		-10,427
	Payment of asset retirement obligations		-16,548		-4,886
	Liabilities incurred and assumed		3,268		115
	Carrying amount of asset retirement obligations, as of end of period		164,664		166,399
	Less:  Current portion of asset retirement obligations		-49,114		-35,368
	Long-term asset retirement obligations	$	115,550	$	131,031

Equity_Transactions

Equity Transactions	3 Months Ended
	Mar. 31, 2014
Equity Transactions [Abstract]	'
Equity Transactions	'
	Note 9 – 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.  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.
	The purchasers also have a 90-day option to purchase up to $25,000,000 of additional common stock, warrants and convertible debt on the same terms as the initial issuance.  See Note 5:  “Debt Obligations” for discussion of the Securities Purchase Agreement.

StockBased_Compensation_Arrang

Stock-Based Compensation Arrangements	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation Arrangements [Abstract]	'
Stock-Based Compensation Arrangements	'
	Note 10 – 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.  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,
		2014			2013
	G&A Expenses	$	971		$	832
	Capitalized G&A		163			859
	Total non-cash stock-based compensation	$	1,134		$	1,691
	At March 31, 2014, total compensation cost related to awards not yet recognized was approximately $10.1 million and is expected to be recognized over a weighted average period of less than three years.
	Stock Options
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model. We did not grant any stock options during 2013 or 2014.  Information relating to outstanding stock options is summarized as follows:
				Weighted		Weighted
		Number of		Average		Average
		Shares		Exercise		Contractual		Aggregate
		Underlying		Price per		Life in		Intrinsic
		Options		Share		Years		Value
	Balance outstanding - January 1, 2014	120	$	7.55
	Forfeited	-1		6.68
	Balance outstanding - March 31, 2014	119	$	7.56		4.1	$	-
	Currently exercisable - March 31, 2014	119	$	7.56		4.1	$	-
	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, 2014 is presented below:
						Weighted
						Average Grant
						Date Fair
			Number of			Value per
			Shares			Share
	Balance outstanding - January 1, 2014		628		$	7.44
	Granted		548			8.75
	Vested		-283			8.71
	Forfeited		-51			6.04
	Balance outstanding - March 31, 2014		842		$	5.72
	Total grant date fair value of shares vesting during the period	$	2,622
	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.
	The status of the performance-based share awards as of March 31, 2014 are presented below:
							Weighted
							Average Grant
							Date Fair
			Number of				Value per
			Shares				Share
	Balance outstanding - January 1, 2014		707			$	11.01
	Granted		516				8.29
	Forfeited		-86				10.36
	Balance outstanding - March 31, 2014		1,137			$	9.83

Loss_Per_Share

Loss Per Share	3 Months Ended
	Mar. 31, 2014
Loss Per Share [Abstract]	'
Loss Per Share	'
	Note 11 – 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,
		2014	2013
	Warrants, options and stock-based compensation	9,055	3,915
	Convertible debt	15,933	11,654
	Convertible preferred stock	4,229	4,229
		29,217	19,798

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements [Abstract]	'
Fair Value Measurements	'
	Note 12 – Fair Value Measurements
	We measure the fair value of financial assets and liabilities on a recurring basis, defining fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.  The fair value is based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations.  This includes not only the credit standing of counterparties involved and the impact of credit enhancements but also the impact of our own nonperformance risk on our liabilities.  Fair value measurements are classified and disclosed in one of the following categories:
	Level  1:Fair value is based on actively-quoted market prices, if available.
	Level  2:In the absence of actively-quoted market prices, we seek price information from external sources, including broker quotes and industry publications.  Substantially all of these inputs are observable in the marketplace during the entire term of the instrument, derived from observable data, or supported by observable levels at which transactions are executed in the marketplace.
	Level  3:If valuations require inputs that are both significant to the fair value measurement and less observable from objective sources, we must estimate prices based on available historical and near-term future price information and certain statistical methods that reflect our market assumptions.
	We apply fair value measurements to certain assets and liabilities including commodity derivative instruments and embedded derivatives relating to conversion and change in control features in certain of our debt instruments.  We seek to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.
	Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement.  The following table summarizes the valuation of our financial instruments by pricing levels as of March 31, 2014 and December 31, 2013:
		Quoted Market Prices				Significant Other			Significant
		in Active Markets -				Observable Inputs -			Unobservable Inputs			Total
		Level 1				Level 2			Level - 3			Fair Value
	Embedded derivative liabilities:
	As of March 31, 2014		$	-			$	-		$	-8,166		$	-8,166
	As of December 31, 2013		$	-			$	-		$	-9,245		$	-9,245
	We use a derivative valuation model to derive the value of our embedded derivatives.  Key inputs into this valuation model are our current stock price, risk-free interest rates, the stock volatility and our implied credit spread. The first two aforementioned inputs are based on observable market data and are considered Level 2 inputs while the last two aforementioned inputs are unobservable and thus require management’s judgment and are considered Level 3 inputs.  A 5% decrease or increase in the stock volatility has an inverse effect to the change in the liability and would result in an approximately $0.3 million decrease or increase, respectively.
	The following is a reconciliation of changes in fair value of net derivative assets and liabilities classified as Level 3:
		Three Months Ended
		March 31,
			2014		2013
	Balance at beginning of period	$	-9,245	$	-7,402
	Derivative issuance		-1,580		-
	Realized and unrealized gains included in earnings		2,659		1,580
	Balance at end of period	$	-8,166	$	-5,822
	Changes in unrealized gains relating to derivatives assets and liabilities
	still held at the end of the period	$	2,659	$	1,580

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2014
Derivative Instruments [Abstract]	'
Derivative Instruments	'
	Note 13 – Derivative Instruments
	We had embedded derivatives related to debt and equity instruments at March 31, 2014.
	The fair market value of these derivative instruments is included in our balance sheet as follows for the periods indicated:
			March 31,			December 31,
			2014			2013
	Derivatives not designated as hedges:
	Embedded derivatives related to debt and equity instrument:
	Liabilities:
	Other liabilities - current	$	-580		$	-
	Other liabilities - long-term		-7,586			-9,245
	The effect of the derivatives not designated as hedges on our results of operations was as follows:
				Three Months Ended
				March 31,
				2014			2013
	Unrealized gains on embedded derivatives
	related to debt and equity instruments			$	2,659		$	1,580

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Disclosures [Abstract]	'
Supplemental Cash Flow Information	'
	Note 14 – Supplemental Cash Flow Information
	Cash paid (refunded) during the period for interest and income taxes was as follows:
			Three Months Ended March 31,
			2014		2013
	Interest paid	$	47,814	$	40,701
	Income taxes paid (refunded)	$	-14,002	$	2,121

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies [Abstract]	'
Commitments And Contingencies	'
	Note 15 – Commitments and Contingencies
	Commitments Related to Asset Retirement Obligations
	We have several agreements related to abandonment liabilities for certain of our U.K. oil and gas properties.  Under these agreements, unaffiliated third parties pledged cash to secure letters of credit covering certain of our abandonment liabilities and we agreed to reimburse the pledged cash in the event that the letters of credit are drawn and pledged cash is utilized to satisfy the commitment.  We have no cash collateral associated with these agreements and the commitments under the agreements are not recorded as liabilities.  The associated abandonment obligations are recorded in other long-term liabilities as part of our asset retirement obligations.  Fees and expenses related to these agreements are included in “Letter of credit fees” in other expenses on our condensed consolidated statement of operations.
	Decommissioning Security Agreements
	Procurement Agreements
	Combined Procurement Agreement
	On January 24, 2014, we also 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 (approximately $130 million as of January 24, 2014, subsequently reduced to $90 million as discussed below).  The letters of credit secure decommissioning obligations in connection with certain of our U.K. licences.  The Combined Procurement Agreement was entered into to replace the Alba Reimbursement Agreement and the LOC Procurement Agreement.
	Due to a change in the U.K. tax treatment for decommissioning, we have amended our Decommissioning Securities Agreement for the Alba field.  The new tax law, which allows companies to treat decommissioning on an after-tax basis (including PRT), enabled us to reduce our current letter of credit amount on the Alba field from $120 million to approximately $55 million, resulting in an aggregate $90 million in outstanding letters of credit securing decommissioning obligations under the Combined Procurement Agreement.
	Under the Combined Procurement Agreement, we agreed to pay 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.
	The Combined Procurement Agreement matures on the earlier of (a) November 30, 2017 and (b) the date 91 days prior to the maturity of the Company’s 5.5% convertible senior notes due 2016 and 11.5% convertible notes due 2016, if such notes have not been converted, cancelled, extinguished, extended or refinanced in full prior to such date, with a resulting maturity date not earlier than March 1, 2018.  The Combined Procurement Agreement contains customary representations, warranties, covenants and provisions with respect to events of default that are substantially similar to the covenants in the Term Loan Facility.  Our obligations under the Combined Procurement Agreement are unconditionally guaranteed by us and each of our current and future restricted subsidiaries and secured by substantially all of our assets and the assets of our current and future restricted subsidiaries.
	As of March 31, 2014, we do not expect to begin decommissioning activities for the Alba field for many years.  The timing of decommissioning activities will be determined by the ultimate performance and life of the reservoir, which is not expected to occur until 2029 or later.
	LOC Procurement Agreement
	On January 9, 2013, we entered into a LOC Procurement agreement (the “LOC Procurement Agreement”) with an unaffiliated third party entity, which matures on July 9, 2014.  The LOC Procurement Agreement was entered into in connection with the unaffiliated third party’s entry into a credit support arrangement with a providing bank. Pursuant to this credit support arrangement, the third party pledged cash, contributed by one of our shareholders, to secure letters of credit in the amount of $33.0 million for the support of decommissioning obligations in connection with certain of our U.K. license agreements.
	Concurrent with our entry into the Combined Procurement Agreement on January 24, 2014, the LOC Procurement Agreement was terminated, and we paid all outstanding and accrued fees totaling approximately $0.2 million.
	Alba Reimbursement Agreement
	During the second quarter of 2012, we entered into a reimbursement agreement covering approximately $120 million related to our decommissioning obligations for the Alba field (the “Alba Reimbursement Agreement”).  We paid a fee of 13% per year, payable quarterly, computed based on the outstanding amount of each letter of credit.  In addition, our obligations under the reimbursement agreement are secured on a pari passu basis with our obligations under the Revolving Credit Facility by a first lien on substantially all of our assets.
	With the execution of the Combined Procurement Agreement, on January 24, 2014, we terminated the Alba Reimbursement Agreement and paid all outstanding and accrued fees totaling approximately $122 million.
	Terminated Acquisition of Marcellus Assets
	On July 17, 2011, we entered into agreements with SM Energy Company and certain other sellers named therein (“SM Energy”) for the purchase of oil and gas leases, producing properties, geophysical data, a pipeline and related assets in the Marcellus shale play in Pennsylvania for aggregate consideration of approximately $110 million (the “SM Purchase Agreements”).  We terminated the agreements on December 14, 2011, based on our conclusion that (i) the title defects we identified, after analyzing SM Energy’s responses to the notice of defects and valuation of the defects; and (ii) the condition of the pipeline was not in compliance with applicable regulatory standards.
	SM Energy filed a lawsuit against us in Texas state court on December 20, 2011 alleging that we breached the SM Purchase Agreements by terminating them 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 will:
		·	forfeit our $6 million deposit;
		·	pay SM Energy $5 million;
		·	pay an additional  $4.5 million in three graduated payments, beginning in twelve months; and
		·	issue warrants to purchase 2.1 million shares of our common stock.
	We recorded $19 million in total settlement expense in connection with the settlement, including a $6 million deposit that was paid to SM Energy prior to the execution of the agreements in 2011.

Guarantor_Subsidiaries

Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2014
General 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 Senior 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 Senior Notes or satisfaction and discharge of the indentures governing the Senior 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 Senior Notes.
	Condensed consolidating financial statements for our guarantor subsidiaries and non-guarantor subsidiaries are presented in the following tables:
	As of March 31, 2014
		Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
	Cash and cash equivalents	$	-	$	28,753	$	26,737	$	-	$	55,490
	Accounts receivable		-		2,273		45,944		-		48,217
	Current receivables due from affiliates		850,227		6,704		49,036		-905,967		-
	Prepaid expenses and other		-		813		82,083		-		82,896
	Current Assets		850,227		38,543		203,800		-905,967		186,603
	Property, plant and equipment, net		-		88,421		965,354		-		1,053,775
	Goodwill		-		-		259,238		-		259,238
	Long-term receivables due from affiliates		-		500,000		-		-500,000		-
	Investments in subsidiaries		57,662		219,058		-		-276,720		-
	Other assets		19,619		56		13,322		-		32,997
	Total Assets	$	927,508	$	846,078	$	1,441,714	$	-1,682,687	$	1,532,613
	Accounts payable	$	-	$	10,094	$	46,105	$	-	$	56,199
	Current maturities of debt		-		-		2,140		-		2,140
	Deferred revenue		-		-		2,152		-		2,152
	Monetary production payment, current portion		-		-		120,833		-		120,833
	Current liabilities due to affiliates		648		899,237		6,082		-905,967		-
	Accrued expenses and other		10,655		6,345		62,219		-		79,219
	Current Liabilities		11,303		915,676		239,531		-905,967		260,543
	Long-term debt		691,483		-		200,346		-		891,829
	Long-term liabilities due to affiliates		-		-		500,000		-500,000		-
	Deferred taxes		-		-		173,847		-		173,847
	Monetary production payment, long-term portion		-		-		40,833		-		40,833
	Other liabilities		4,065		5,077		118,647		-		127,789
	Total Liabilities		706,851		920,753		1,273,204		-1,405,967		1,494,841
	Series C convertible preferred stock		43,703		-		-		-		43,703
	Stockholders' equity		176,954		-74,675		168,510		-276,720		-5,931
	Total Liabilities and Equity	$	927,508	$	846,078	$	1,441,714	$	-1,682,687	$	1,532,613
	As of December 31, 2013
		Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
	Cash and cash equivalents	$	-	$	2,417	$	32,325	$	-	$	34,742
	Accounts receivable		-		1,832		63,339		-		65,171
	Current receivables due from affiliates		853,900		20,783		45,982		-920,665		-
	Prepaid expenses and other		-		594		59,724		-		60,318
	Current Assets		853,900		25,626		201,370		-920,665		160,231
	Property, plant and equipment, net		-		87,313		984,838		-		1,072,151
	Goodwill		-		-		259,238		-		259,238
	Long-term receivables due from affiliates		-		500,000		8		-500,008		-
	Investments in subsidiaries		57,662		219,066		-		-276,728		-
	Other assets		20,518		6,056		6,648		-		33,222
	Total Assets	$	932,080	$	838,061	$	1,452,102	$	-1,697,401	$	1,524,842
	Accounts payable	$	-	$	1,214	$	36,819	$	-	$	38,033
	Current maturities of debt		-		-		-		-		-
	Deferred revenue		-		-		20,965		-		20,965
	Monetary production payment deposit		-		-		74,167		-		74,167
	Current liabilities due to affiliates		648		899,853		20,172		-920,673		-
	Accrued expenses and other		27,474		3,353		57,798		-		88,625
	Current Liabilities		28,122		904,420		209,921		-920,673		221,790
	Long-term debt		678,850		-		192,028		-		870,878
	Long-term liabilities due to affiliates		-		-		500,000		-500,000		-
	Deferred taxes		-		-		146,213		-		146,213
	Monetary production payment, long-term portion		-		-		92,500		-		92,500
	Other liabilities		3,535		601		127,234		-		131,370
	Total Liabilities		710,507		905,021		1,267,896		-1,420,673		1,462,751
	Series C convertible preferred stock		43,703		-		-		-		43,703
	Stockholders' equity		177,870		-66,960		184,206		-276,728		18,388
	Total Liabilities and Equity	$	932,080	$	838,061	$	1,452,102	$	-1,697,401	$	1,524,842
	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
Impairment of oil and gas properties												-		-		-		-		-
General and administrative												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		578		-26,435		15,000		-31,477
Letter of credit fees												-		-		-3,789		-		-3,789
Loss on early extinguishment of debt												-		-		-3,543		-		-3,543
Litigation settlement expense												-		-19,034		-		-		-19,034
Unrealized foreign currency gains (losses)												-		-		-1,273		-		-1,273
Other income (expense)												-322		14,406		-1,104		-15,000		-2,020
Loss Before Income Taxes												-21,468		-7,714		-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												-21,468		-7,714		-15,688		-		-44,870
Preferred stock dividends												456		-		-		-		456
Net loss to common shareholders											$	-21,924	$	-7,714	$	-15,688	$	-	$	-45,326
For the Three Months Ended March 31, 2013
											Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue											$	-	$	2,536	$	55,136	$	-	$	57,672
Operating expenses												-		3,615		13,875		-		17,490
DD&A expense												-		1,139		21,808		-		22,947
Impairment of oil and gas properties												-		3,534		-		-		3,534
General and administrative												732		2,611		2,139		-		5,482
Income (loss) from Operations												-732		-8,363		17,314		-		8,219
Other Income (Expense):
Unrealized gains (losses) on derivatives												-700		-		2,280		-		1,580
Interest expense												-20,160		603		-16,881		15,000		-21,438
Letter of credit fees												-		-		-11,380		-		-11,380
Loss on early extinguishment of debt												-		-		-		-		-
Litigation settlement expense												-		-		-		-		-
Unrealized foreign currency gains (losses)												-		-1	-	9,761	-	-	-	9,760
Other income (expense)												1		14,478		643		-15,000		122
Income (Loss) Before Income Taxes												-21,591		6,717		1,737		-		-13,137
Petroleum Revenue Tax ("PRT") Expense												-		-		628		-		628
Corporate Tax Expense												-		-		281		-		281
Total tax expense												-		-		909		-		909
Net income (loss)												-21,591		6,717		828		-		-14,046
Preferred stock dividends												456		-		-		-		456
Net income (loss) to common shareholders											$	-22,047	$	6,717	$	828	$	-	$	-14,502
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	$	-21,468	$	-7,714	$	-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
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Litigation settlement expense				19,034		-		-		19,034
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		-37,164		31,328		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
Financing costs paid		-456		-		-8,817		-		-9,273
Intercompany cash management		8,160		8,984		-17,144		-		-
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		37,164		8,984		-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
For the Three Months Ended March 31, 2013
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-21,591	$	6,717	$	828	$		$	-14,046
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		1,139		21,808		-		22,947
Impairment of oil and gas properties		-		3,534		-		-		3,534
Deferred tax expense (benefit)		-		-		128		-		128
Unrealized (gains) losses on derivatives		700		-		-2,280		-		-1,580
Amortization of non-cash compensation		163		-		-		669		832
Amortization of loan costs and discount		1,951		-		1,488		-		3,439
Non-cash interest expense		-		-		2,274		-		2,274
Other		43		-4		-4,762		-		-4,723
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		275		15,554		-		15,829
(Increase) decrease in other current assets		3,643		-15,057		55		-		-11,359
Increase (decrease) in liabilities		-17,112		52		48,059		-669		30,330
Net Cash Provided by (Used in)
Operating Activities		-32,203		-3,344		83,152		-		47,605
Cash Flows From Investing Activities:
Capital expenditures		-		-2,532		-56,542		-		-59,074
Net Cash Used in Investing Activities		-		-2,532		-56,542		-		-59,074
Cash Flows From Financing Activities:
Proceeds from issuance of MPP		-		-		43,000		-		43,000
Intercompany cash management		32,794		-19,399		-13,395		-		-
Financing costs paid		-591		-		-9,344		-		-9,935
Net Cash Provided by (Used in)
Financing Activities		32,203		-19,399		20,261		-		33,065
Net Change in Cash and Cash Equivalents		-		-25,275		46,871		-		21,596
Cash and Cash Equivalents, Beginning
of Period		-		27,800		31,385		-		59,185
Cash and Cash Equivalents, End of Period	$	-	$	2,525	$	78,256	$	-	$	80,781

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Summary Of Significant Accounting Policies [Abstract]	'
Basis of Presentation	'
	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 (“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. 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.
	These accounting principles require 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.
Use Of 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;
		·	estimates of future dismantlement and restoration costs;
		·	estimates of fair values used in purchase accounting; and
		·	estimates of the fair value of derivative instruments.

Property_And_Equipment_Tables

Property And Equipment (Tables)	3 Months Ended
	Mar. 31, 2014
Property and Equipment [Abstract]	'
Schedule Of Property And Equipment	'
			March 31,		December 31,
			2014		2013
	Oil and gas properties under the full cost method:
	Subject to amortization	$	1,102,962	$	1,084,669
	Not subject to amortization:
	Incurred in 2014		23,041		-
	Incurred in 2013		37,936		52,748
	Incurred in 2012		134,287		138,641
	Incurred prior to 2012		175,551		177,271
			1,473,777		1,453,329
	Computers, furniture and fixtures		8,733		8,734
	Total property and equipment		1,482,510		1,462,063
	Accumulated depreciation, depletion and amortization		-428,735		-389,912
	Net property and equipment	$	1,053,775	$	1,072,151

Debt_Obligations_Tables

Debt Obligations (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Obligations [Abstract]	'
Schedule Of Debt	'
			March 31,		December 31,
			2014		2013
	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 senior notes, 6.5% fixed rate, due 2017		17,500		-
	Term loan facility, variable rate, due 2017		125,000		-
	Revolving credit facility, 13% fixed rate, due 2014		-		115,163
	Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016		80,692		78,437
			912,192		882,600
	Less:  debt discount, net of premium		-18,223		-11,722
	Less:  current maturities		-2,140		-
	Long-term debt	$	891,829	$	870,878

LongTerm_Liabilities_Tables

Long-Term Liabilities (Tables)	3 Months Ended
	Mar. 31, 2014
Monetary Production Payment [Abstract]	'
Schedule Of Monetary Production Payment Liability	'
			March 31,		December 31,
			2014		2013
	Monetary production payment	$	161,666	$	166,667
	Less:  current portion		-120,833		-74,167
	Long-term monetary production payment	$	40,833	$	92,500

Other_LongTerm_Liabilities_Tab

Other Long-Term Liabilities (Tables)	3 Months Ended
	Mar. 31, 2014
Other Long-Term Liabilities [Abstract]	'
Schedule Of Other Liabilities	'
			March 31,		December 31,
			2014		2013
	Asset retirement obligations	$	115,550	$	121,534
	Long-term derivative liabilities		7,586		9,245
	Other		4,653		591
	Total Other Liabilities	$	127,789	$	131,370
Schedule Of Asset Retirement Obligations	'
			Three Months Ended
			March 31,
			2014		2013
	Carrying amount of asset retirement obligations as of beginning of period	$	170,429	$	176,076
	Accretion expense (included in DD&A expense)		6,145		5,521
	Impact of foreign currency exchange rate changes		1,370		-10,427
	Payment of asset retirement obligations		-16,548		-4,886
	Liabilities incurred and assumed		3,268		115
	Carrying amount of asset retirement obligations, as of end of period		164,664		166,399
	Less:  Current portion of asset retirement obligations		-49,114		-35,368
	Long-term asset retirement obligations	$	115,550	$	131,031

StockBased_Compensation_Arrang1

Stock-Based Compensation Arrangements (Tables)	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation Arrangements [Abstract]	'
Schedule Of General And Administrative Expenses	'
			Three Months Ended
			March 31,
		2014			2013
	G&A Expenses	$	971		$	832
	Capitalized G&A		163			859
	Total non-cash stock-based compensation	$	1,134		$	1,691
Schedule Of Outstanding Stock Options	'
				Weighted		Weighted
		Number of		Average		Average
		Shares		Exercise		Contractual		Aggregate
		Underlying		Price per		Life in		Intrinsic
		Options		Share		Years		Value
	Balance outstanding - January 1, 2014	120	$	7.55
	Forfeited	-1		6.68
	Balance outstanding - March 31, 2014	119	$	7.56		4.1	$	-
	Currently exercisable - March 31, 2014	119	$	7.56		4.1	$	-
Schedule Of Restricted Shares Granted	'
						Weighted
						Average Grant
						Date Fair
			Number of			Value per
			Shares			Share
	Balance outstanding - January 1, 2014		628		$	7.44
	Granted		548			8.75
	Vested		-283			8.71
	Forfeited		-51			6.04
	Balance outstanding - March 31, 2014		842		$	5.72
	Total grant date fair value of shares vesting during the period	$	2,622
Schedule Of Performance-Based Share Awards	'
							Weighted
							Average Grant
							Date Fair
			Number of				Value per
			Shares				Share
	Balance outstanding - January 1, 2014		707			$	11.01
	Granted		516				8.29
	Forfeited		-86				10.36
	Balance outstanding - March 31, 2014		1,137			$	9.83

Loss_Per_Share_Tables

Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Loss Per Share [Abstract]	'
Schedule Of Common Shares Potentially Issuable	'
		March 31,
		2014	2013
	Warrants, options and stock-based compensation	9,055	3,915
	Convertible debt	15,933	11,654
	Convertible preferred stock	4,229	4,229
		29,217	19,798

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements [Abstract]	'
Schedule Of Valuations Of Investments And Financial Instruments	'
		Quoted Market Prices				Significant Other			Significant
		in Active Markets -				Observable Inputs -			Unobservable Inputs			Total
		Level 1				Level 2			Level - 3			Fair Value
	Embedded derivative liabilities:
	As of March 31, 2014		$	-			$	-		$	-8,166		$	-8,166
	As of December 31, 2013		$	-			$	-		$	-9,245		$	-9,245
Schedule Of Reconciliation Of Fair Value Of Derivative Assets And Liabilities	'
		Three Months Ended
		March 31,
			2014		2013
	Balance at beginning of period	$	-9,245	$	-7,402
	Derivative issuance		-1,580		-
	Realized and unrealized gains included in earnings		2,659		1,580
	Balance at end of period	$	-8,166	$	-5,822
	Changes in unrealized gains relating to derivatives assets and liabilities
	still held at the end of the period	$	2,659	$	1,580

Derivative_Instruments_Tables

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments [Abstract]	'
Schedule Of Fair Market Value Of Derivative Instruments Included On The Balance Sheet	'
			March 31,			December 31,
			2014			2013
	Derivatives not designated as hedges:
	Embedded derivatives related to debt and equity instrument:
	Liabilities:
	Other liabilities - current	$	-580		$	-
	Other liabilities - long-term		-7,586			-9,245
Schedule Of Effect Of Derivatives Not Designated As Hedges On Results Of Operations	'
				Three Months Ended
				March 31,
				2014			2013
	Unrealized gains on embedded derivatives
	related to debt and equity instruments			$	2,659		$	1,580

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Disclosures [Abstract]	'
Schedule Of Supplemental Cash Flow Information	'
			Three Months Ended March 31,
			2014		2013
	Interest paid	$	47,814	$	40,701
	Income taxes paid (refunded)	$	-14,002	$	2,121

Guarantor_Subsidiaries_Tables

Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2014
General And Guarantor Subsidiaries [Abstract]	'
Schedule Of Condensed Financial Statements	'
	As of March 31, 2014
		Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
	Cash and cash equivalents	$	-	$	28,753	$	26,737	$	-	$	55,490
	Accounts receivable		-		2,273		45,944		-		48,217
	Current receivables due from affiliates		850,227		6,704		49,036		-905,967		-
	Prepaid expenses and other		-		813		82,083		-		82,896
	Current Assets		850,227		38,543		203,800		-905,967		186,603
	Property, plant and equipment, net		-		88,421		965,354		-		1,053,775
	Goodwill		-		-		259,238		-		259,238
	Long-term receivables due from affiliates		-		500,000		-		-500,000		-
	Investments in subsidiaries		57,662		219,058		-		-276,720		-
	Other assets		19,619		56		13,322		-		32,997
	Total Assets	$	927,508	$	846,078	$	1,441,714	$	-1,682,687	$	1,532,613
	Accounts payable	$	-	$	10,094	$	46,105	$	-	$	56,199
	Current maturities of debt		-		-		2,140		-		2,140
	Deferred revenue		-		-		2,152		-		2,152
	Monetary production payment, current portion		-		-		120,833		-		120,833
	Current liabilities due to affiliates		648		899,237		6,082		-905,967		-
	Accrued expenses and other		10,655		6,345		62,219		-		79,219
	Current Liabilities		11,303		915,676		239,531		-905,967		260,543
	Long-term debt		691,483		-		200,346		-		891,829
	Long-term liabilities due to affiliates		-		-		500,000		-500,000		-
	Deferred taxes		-		-		173,847		-		173,847
	Monetary production payment, long-term portion		-		-		40,833		-		40,833
	Other liabilities		4,065		5,077		118,647		-		127,789
	Total Liabilities		706,851		920,753		1,273,204		-1,405,967		1,494,841
	Series C convertible preferred stock		43,703		-		-		-		43,703
	Stockholders' equity		176,954		-74,675		168,510		-276,720		-5,931
	Total Liabilities and Equity	$	927,508	$	846,078	$	1,441,714	$	-1,682,687	$	1,532,613
	As of December 31, 2013
		Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
	Cash and cash equivalents	$	-	$	2,417	$	32,325	$	-	$	34,742
	Accounts receivable		-		1,832		63,339		-		65,171
	Current receivables due from affiliates		853,900		20,783		45,982		-920,665		-
	Prepaid expenses and other		-		594		59,724		-		60,318
	Current Assets		853,900		25,626		201,370		-920,665		160,231
	Property, plant and equipment, net		-		87,313		984,838		-		1,072,151
	Goodwill		-		-		259,238		-		259,238
	Long-term receivables due from affiliates		-		500,000		8		-500,008		-
	Investments in subsidiaries		57,662		219,066		-		-276,728		-
	Other assets		20,518		6,056		6,648		-		33,222
	Total Assets	$	932,080	$	838,061	$	1,452,102	$	-1,697,401	$	1,524,842
	Accounts payable	$	-	$	1,214	$	36,819	$	-	$	38,033
	Current maturities of debt		-		-		-		-		-
	Deferred revenue		-		-		20,965		-		20,965
	Monetary production payment deposit		-		-		74,167		-		74,167
	Current liabilities due to affiliates		648		899,853		20,172		-920,673		-
	Accrued expenses and other		27,474		3,353		57,798		-		88,625
	Current Liabilities		28,122		904,420		209,921		-920,673		221,790
	Long-term debt		678,850		-		192,028		-		870,878
	Long-term liabilities due to affiliates		-		-		500,000		-500,000		-
	Deferred taxes		-		-		146,213		-		146,213
	Monetary production payment, long-term portion		-		-		92,500		-		92,500
	Other liabilities		3,535		601		127,234		-		131,370
	Total Liabilities		710,507		905,021		1,267,896		-1,420,673		1,462,751
	Series C convertible preferred stock		43,703		-		-		-		43,703
	Stockholders' equity		177,870		-66,960		184,206		-276,728		18,388
	Total Liabilities and Equity	$	932,080	$	838,061	$	1,452,102	$	-1,697,401	$	1,524,842
	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
Impairment of oil and gas properties												-		-		-		-		-
General and administrative												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		578		-26,435		15,000		-31,477
Letter of credit fees												-		-		-3,789		-		-3,789
Loss on early extinguishment of debt												-		-		-3,543		-		-3,543
Litigation settlement expense												-		-19,034		-		-		-19,034
Unrealized foreign currency gains (losses)												-		-		-1,273		-		-1,273
Other income (expense)												-322		14,406		-1,104		-15,000		-2,020
Loss Before Income Taxes												-21,468		-7,714		-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												-21,468		-7,714		-15,688		-		-44,870
Preferred stock dividends												456		-		-		-		456
Net loss to common shareholders											$	-21,924	$	-7,714	$	-15,688	$	-	$	-45,326
For the Three Months Ended March 31, 2013
											Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue											$	-	$	2,536	$	55,136	$	-	$	57,672
Operating expenses												-		3,615		13,875		-		17,490
DD&A expense												-		1,139		21,808		-		22,947
Impairment of oil and gas properties												-		3,534		-		-		3,534
General and administrative												732		2,611		2,139		-		5,482
Income (loss) from Operations												-732		-8,363		17,314		-		8,219
Other Income (Expense):
Unrealized gains (losses) on derivatives												-700		-		2,280		-		1,580
Interest expense												-20,160		603		-16,881		15,000		-21,438
Letter of credit fees												-		-		-11,380		-		-11,380
Loss on early extinguishment of debt												-		-		-		-		-
Litigation settlement expense												-		-		-		-		-
Unrealized foreign currency gains (losses)												-		-1	-	9,761	-	-	-	9,760
Other income (expense)												1		14,478		643		-15,000		122
Income (Loss) Before Income Taxes												-21,591		6,717		1,737		-		-13,137
Petroleum Revenue Tax ("PRT") Expense												-		-		628		-		628
Corporate Tax Expense												-		-		281		-		281
Total tax expense												-		-		909		-		909
Net income (loss)												-21,591		6,717		828		-		-14,046
Preferred stock dividends												456		-		-		-		456
Net income (loss) to common shareholders											$	-22,047	$	6,717	$	828	$	-	$	-14,502
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	$	-21,468	$	-7,714	$	-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
Loss on early extinguishment of debt		-		-		6,856		-		6,856
Litigation settlement expense				19,034		-		-		19,034
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		-37,164		31,328		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
Financing costs paid		-456		-		-8,817		-		-9,273
Intercompany cash management		8,160		8,984		-17,144		-		-
Other financing		-416		-		-		-		-416
Net Cash Provided by (Used in)
Financing Activities		37,164		8,984		-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
For the Three Months Ended March 31, 2013
	Endeavour International Corporation		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Eliminations		Consolidated
Cash Flows from Operating Activities:
Net loss	$	-21,591	$	6,717	$	828	$		$	-14,046
Adjustments to reconcile net loss to
net cash provided by (used in) operations
Depreciation, depletion and amortization		-		1,139		21,808		-		22,947
Impairment of oil and gas properties		-		3,534		-		-		3,534
Deferred tax expense (benefit)		-		-		128		-		128
Unrealized (gains) losses on derivatives		700		-		-2,280		-		-1,580
Amortization of non-cash compensation		163		-		-		669		832
Amortization of loan costs and discount		1,951		-		1,488		-		3,439
Non-cash interest expense		-		-		2,274		-		2,274
Other		43		-4		-4,762		-		-4,723
Changes in operating assets and liabilities:
(Increase) decrease in receivables		-		275		15,554		-		15,829
(Increase) decrease in other current assets		3,643		-15,057		55		-		-11,359
Increase (decrease) in liabilities		-17,112		52		48,059		-669		30,330
Net Cash Provided by (Used in)
Operating Activities		-32,203		-3,344		83,152		-		47,605
Cash Flows From Investing Activities:
Capital expenditures		-		-2,532		-56,542		-		-59,074
Net Cash Used in Investing Activities		-		-2,532		-56,542		-		-59,074
Cash Flows From Financing Activities:
Proceeds from issuance of MPP		-		-		43,000		-		43,000
Intercompany cash management		32,794		-19,399		-13,395		-		-
Financing costs paid		-591		-		-9,344		-		-9,935
Net Cash Provided by (Used in)
Financing Activities		32,203		-19,399		20,261		-		33,065
Net Change in Cash and Cash Equivalents		-		-25,275		46,871		-		21,596
Cash and Cash Equivalents, Beginning
of Period		-		27,800		31,385		-		59,185
Cash and Cash Equivalents, End of Period	$	-	$	2,525	$	78,256	$	-	$	80,781

General_Details

General (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]	'	'
Outstanding indebtedness	$912,192,000	$882,600,000
Value of common stock issued	12,500,000	'
6.5% Convertible Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt principal amount	$17,500,000	'
Interest rate	6.50%	'

Property_And_Equipment_Narrati

Property And Equipment (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Oil And Gas Properties And Equipment [Line Items]	'	'
Amortization period	'3 years	'
Transfer period	'2 years	'
Directly related employee costs capitalized	$3,100,000	$5,100,000
Impairment of oil and gas properties	'	3,534,000
U.S. [Member]	'	'
Oil And Gas Properties And Equipment [Line Items]	'	'
Impairment of oil and gas properties	'	3,500,000
Average price per barrel, oil	98.43	92.63
Average price per barrel, gas	3.99	2.97
United Kingdom [Member]	'	'
Oil And Gas Properties And Equipment [Line Items]	'	'
Average price per barrel, oil	107.06	110.49
Average price per barrel, gas	10.57	9.71
U.K. Activities [Member]	'	'
Oil And Gas Properties And Equipment [Line Items]	'	'
Exploration and development related capitalized costs	$2,600,000	$6,200,000

Property_And_Equipment_Schedul

Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	$1,473,777	$1,453,329
Computers, furniture and fixtures	8,733	8,734
Total property and equipment	1,482,510	1,462,063
Accumulated depreciation, depletion and amortization	-428,735	-389,912
Net property and equipment	1,053,775	1,072,151
Subject To Amortization [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	1,102,962	1,084,669
Not Subject To Amortization [Member] | Incurred in 2014 [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	23,041	'
Not Subject To Amortization [Member] | Incurred in 2013 [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	37,936	52,748
Not Subject To Amortization [Member] | Incurred in 2012 [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	134,287	138,641
Not Subject To Amortization [Member] | Incurred prior to 2012 [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Oil and gas properties under the full cost method	$175,551	$177,271

Deferred_Revenue_Details

Deferred Revenue (Details) (United Kingdom North Sea [Member], USD $)	Dec. 31, 2013
In Millions, unless otherwise specified	bbl
United Kingdom North Sea [Member]	'
Oil and Gas Delivery Commitments and Contracts [Line Items]	'
Deferred revenue	$22.50
Number of barrels of oil to be delivered	200,000

Debt_Obligations_Senior_Notes_

Debt Obligations (Senior Notes Narrative) (Details) (USD $)	Oct. 31, 2012	Feb. 29, 2012	Feb. 29, 2012	Mar. 31, 2014	Dec. 31, 2013
	First Priority Notes [Member]	First Priority Notes [Member]	Second Priority Notes [Member]	Senior Notes,12% Fixed Rate, Due 2018 [Member]	Senior Notes,12% Fixed Rate, Due 2018 [Member]
	Senior Notes [Member]	Senior Notes [Member]	Senior Notes [Member]
Debt Instrument [Line Items]	'	'	'	'	'
Debt principal amount	$54,000,000	$350,000,000	$150,000,000	'	'
Interest rate	12.00%	12.00%	12.00%	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, 2014	Dec. 31, 2013
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%
Debt maturity date	'	15-Jul-16	'
Conversion rate	54.019	'	'
Conversion price	$18.51	'	'
Principal amount of notes	$1,000	'	'

Debt_Obligations_65_Convertibl

Debt Obligations (6.5% Convertible Senior Notes Narrative) (Details) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended			3 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Feb. 28, 2014	Mar. 01, 2014	Feb. 28, 2014	Mar. 31, 2014	Jul. 31, 2011	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
	Securities Purchase Agreement [Member]	Securities Purchase Agreement [Member]	Securities Purchase Agreement [Member]	Securities Purchase Agreement [Member]	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	11.5% Convertible Bonds [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Credit facility initiation date	'	'	'	28-Feb-14	'	'	'	'
Value of common stock, warrants and convertible notes issued	$55,000,000	$30,000,000	'	'	'	'	'	'
Common stock, shares issued	2.9	2.9	2.9	'	'	'	'	'
Number of common stock shares warrants can be converted into	0.7	0.7	0.7	'	'	'	'	'
Warrants exercise price	$5.29	$5.29	$5.29	'	'	'	'	'
Debt principal amount	'	17,500,000	'	'	135,000,000	'	'	'
Interest rate	'	6.50%	'	'	'	5.50%	5.50%	11.50%
Option purchase period	'	'	'90 days	'90 days	'	'	'	'
Value of options to purchase additional shares	'	$25,000,000	$25,000,000	'	'	'	'	'
Conversion rate	'	4.662	'	'	54.019	'	'	61
Conversion price	'	$4.66	'	'	$18.51	'	'	$16.52

Debt_Obligations_Term_Loan_Fac

Debt Obligations (Term Loan Facilities) (Details)	0 Months Ended	3 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Jan. 24, 2014	Mar. 31, 2014	Jan. 24, 2014	Jan. 24, 2014	Jan. 24, 2014	Jan. 24, 2014	Jan. 24, 2014	Jan. 24, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
	Term Loan Facility [Member]	Term Loan Facility [Member]	Combined Procurement Agreement [Member]	Combined Procurement Agreement [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	Minimum [Member]	Maximum [Member]	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	11.5% Convertible Bonds [Member]
	USD ($)	USD ($)	USD ($)	GBP (£)	Term Loan Facility [Member]	Combined Procurement Agreement [Member]	Term Loan Facility [Member]	Term Loan Facility [Member]
Line of Credit Facility [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Credit facility initiation date	'	24-Jan-14	'	'	'	'	'	'	'	'	'
Maximum credit amount	$255	'	$130	£ 78	'	'	'	'	'	'	'
Amount of term loan facility advanced	125	'	130	'	'	'	'	'	'	'	'
Prepayment fee and accrued interest	2	'	'	'	'	'	'	'	'	'	'
(Loss) on early extinguishment of debt	'	$3.50	'	'	'	'	'	'	'	'	'
Basis spread on variable rate	'	'	'	'	7.00%	7.00%	'	'	'	'	'
Interest rate	'	'	'	'	'	1.25%	1.25%	'	5.50%	5.50%	11.50%
Maturity date	'	30-Nov-17	'	'	'	'	'	'	'	'	'
Minimum interest coverage ratio	'	'	'	'	'	'	150.00%	'	'	'	'
Leverage ratio	'	'	'	'	'	'	'	500.00%	'	'	'
Asset coverage ratio	'	'	'	'	'	'	200.00%	'	'	'	'

Debt_Obligations_Revolving_Cre

Debt Obligations (Revolving Credit Facility Narrative) (Details) (Cyan Partners Limited Partnership [Member], Revolving Credit Facility [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Jan. 24, 2014
Cyan Partners Limited Partnership [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Issuance date	12-Apr-12	'
Amount borrowed	'	$115

Debt_Obligations_115_Convertib

Debt Obligations (11.5% Convertible Bonds) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
	11.5% Convertible Bonds [Member]	7.5% Fixed Rate [Member]	7.5% Fixed Rate [Member]
Debt Instrument [Line Items]	'	'	'
Interest rate	11.50%	7.50%	7.50%
Conversion price	$16.52	'	'
Principal amount of notes	$1,000	'	'
Conversion rate	61	'	'
Debt maturity date	31-Mar-14	'	'

Debt_Obligations_Fair_Value_Na

Debt Obligations (Fair Value Narrative) (Details) (Fair Value, Inputs, Level 3 [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
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	$804.20	$868.40

Debt_Obligations_Schedule_Of_D

Debt Obligations (Schedule Of Debt) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Long-term debt, gross	$912,192	$882,600
Less: debt discount, net of premium	-18,223	-11,722
Less: current maturities	-2,140	'
Long-term debt	891,829	870,878
Senior Notes,12% Fixed Rate, Due 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	554,000	554,000
Interest rate	12.00%	12.00%
Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	135,000	135,000
Interest rate	5.50%	5.50%
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	17,500	'
Interest rate	6.50%	'
Term Loan Facility, Variable Rate, Due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	125,000	'
Revolving Credit Facility, 13% Fixed Rate, Due 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	'	115,163
Interest rate	13.00%	13.00%
Convertible bonds, 11.5% until March 31, 2014 and 7.5% thereafter, due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, gross	$80,692	$78,437
Interest rate	11.50%	11.50%
7.5% Fixed Rate [Member]	'	'
Debt Instrument [Line Items]	'	'
Interest rate	7.50%	7.50%

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014
Income Taxes [Abstract]	'
U.S. statutory rate	35.00%
Foreign statutory rate	62.00%

Monetary_Production_Payment_Na

Monetary Production Payment (Narrative) (Details) (USD $)

1 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

Jan. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Aug. 31, 2013

31-May-13

Apr. 30, 2015

Jan. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Mar. 31, 2014

Alba And Bacchus Fields [Member]

Alba And Bacchus Fields [Member]

Alba And Bacchus Fields [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Minimum [Member]

Maximum [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Long-Term Liabilites [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Monetary production payment

'

$161,666,000

$166,667,000

$25,000,000

$25,000,000

$125,000,000

'

'

'

'

'

'

'

Additional monetary production payment implied cost

'

'

'

9.75%

8.75%

10.00%

'

'

'

'

'

'

'

Principal payment amount

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Expected principal payment

'

'

'

'

'

'

$51,700,000

$51,700,000

$5,800,000

$5,800,000

$5,800,000

$10,000,000

$18,000,000

Monetary_Production_Payment_Sc

Monetary Production Payment (Schedule Of Monetary Production Payment Liability) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Monetary Production Payment [Abstract]	'	'
Monetary production payment	$161,666	$166,667
Less: current portion	120,833	74,167
Long-term monetary production payment	$40,833	$92,500

Other_LongTerm_Liabilities_Sch

Other Long-Term Liabilities (Schedule Of Other Liabilities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Other Long-Term Liabilities [Abstract]	'	'	'
Asset retirement obligations	$115,550	$121,534	$131,031
Long-term derivative liabilities	7,586	9,245	'
Other	4,653	591	'
Total Other Liabilities	$127,789	$131,370	'

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, 2014	Mar. 31, 2013	Dec. 31, 2013
Other Long-Term Liabilities [Abstract]	'	'	'
Carrying amount of asset retirement obligations as of beginning of period	$170,429	$176,076	'
Accretion expense (included in DD&A expense)	6,145	5,521	'
Impact of foreign currency exchange rate changes	1,370	-10,427	'
Payment of asset retirement obligations	-16,548	-4,886	'
Liabilities incurred and assumed	3,268	115	'
Carrying amount of asset retirement obligations, as of end of period	164,664	166,399	'
Less: Current portion of asset retirement obligations	-49,114	-35,368	'
Long-term asset retirement obligations	$115,550	$131,031	$121,534

Equity_Transactions_Narrative_

Equity Transactions (Narrative) (Details) (Securities Purchase Agreement [Member], USD $)	0 Months Ended	1 Months Ended	3 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 01, 2014	Feb. 28, 2014	Mar. 31, 2014
Securities Purchase Agreement [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Common stock, shares issued	2.9	2.9	'
Number of common stock shares warrants can be converted into	0.7	0.7	'
Warrants exercise price	$5.29	$5.29	'
Warrants expiration date	'	28-Feb-19	'
Option purchase period	'	'90 days	'90 days
Value of options to purchase additional shares	$25,000,000	$25,000,000	'

StockBased_Compensation_Arrang2

Stock-Based Compensation Arrangements (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Vesting period	'3 years
Compensation cost related to awards not yet recognized.	$10.10
Unrecognized compensation cost, recognition period	'3 years
Performance period	'3 years
Maximum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Range Of Shares Percent	200.00%
Minimum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
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, 2014	Mar. 31, 2013
Stock-Based Compensation Arrangements [Abstract]	'	'
G&A Expenses	$971	$832
Capitalized G&A	163	859
Total non-cash stock-based compensation	$1,134	$1,691

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, 2014
Stock-Based Compensation Arrangements [Abstract]	'
Options outstanding, beginning balance	120
Options Forfeited	-1
Options outstanding, ending balance	119
Currently excercisable	119
Options outstanding, weighted average excercise price per share, beginning balance	$7.55
Options outstanding, weighted average price per share, forfeited	$6.68
Options outstanding, weighted average excercise price per share, ending balance	$7.56
Currently excercisable	$7.56
Options outstanding, weighted average contractual life in years	'4 years 1 month 6 days
Currently exercisable, weighted average contracutal life in years	'4 years 1 month 6 days

StockBased_Compensation_Arrang5

Stock-Based Compensation Arrangements (Restricted Stock) (Details) (Restricted Stock [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Balance outstanding, Number of Shares	628
Granted, Number of Shares	548
Vested, Number of Shares	-283
Forfeited, Nuimber of Shares	-51
Balance outstanding, Number of Shares	842
Total grant date fair value of shares vesting during the period	$2,622
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$7.44
Granted, Weighted Average Grant Date Fair Value per Share	$8.75
Vested, Weighted Average Grant Date Fair Value per Share	$8.71
Forfeited, Weighted Average Grant Date Fair Value per Share	$6.04
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$5.72

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, 2014
Performance Shares [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Balance outstanding, Number of Shares	707
Granted, Number of Shares	516
Forfeited, Nuimber of Shares	-86
Balance outstanding, Number of Shares	1,137
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$11.01
Granted, Weighted Average Grant Date Fair Value per Share	$8.29
Forfeited, Weighted Average Grant Date Fair Value per Share	$10.36
Balance outstanding, Weighted Average Grant Date Fair Value per Share	$9.83

Loss_Per_Share_Details

Loss Per Share (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Common shares potentially issuable	29,217	19,798
Options, Warrants And Stock-Based Compensation [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Common shares potentially issuable	9,055	3,915
Convertible Debt Securities [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Common shares potentially issuable	15,933	11,654
Convertible Preferred Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Common shares potentially issuable	4,229	4,229

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule Of Valuations Of Investments And Financial Instruments) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total derivative liabilities	($8,166,000)	($9,245,000)
Volatilty rate, increase or decrease	5.00%	'
Amount of increase or decrease in liability based on stock volatilty	300,000	'
Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total derivative liabilities	($8,166,000)	($9,245,000)

Fair_Value_Measurements_Schedu1

Fair Value Measurements (Schedule Of Reconciliation Of Fair Value Of Derivative Assets And Liabilities) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value Measurements [Abstract]	'	'
Balance at beginning of period	($9,245)	($7,402)
Derivative issuance	-1,580	'
Realized amd unrealized gains included in earnings	2,659	1,580
Balance at end of period	-8,166	-5,822
Changes in unrealized gains (losses) relating to derivatives assets and liabilities still held at the end of the period	$2,659	$1,580

Derivative_Instruments_Schedul

Derivative Instruments (Schedule Of Fair Market Value Of Derivative Instruments Included On The Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Embedded derivatives	($7,586)	($9,245)
Other Current Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Embedded derivatives	-580	'
Other Noncurrent Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Embedded derivatives	($7,586)	($9,245)

Derivative_Instruments_Schedul1

Derivative Instruments (Schedule Of Effect Of Derivatives Not Designated As Hedges On Results Of Operations) (Details) (Not Designated as Hedging Instrument [Member], Embedded Derivative Financial Instruments [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Unrealized Gain (Loss) on Derivatives	$2,659	$1,580

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, 2014	Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]	'	'
Interest paid	$47,814	$40,701
Income taxes paid (refunded)	($14,002)	$2,121

Commitments_And_Contingencies_

Commitments And Contingencies (Combined Procurement Agreement) (Details) (Combined Procurement Agreement [Member])	Jan. 24, 2014	Jan. 24, 2014	Dec. 31, 2013	Jan. 24, 2014	Mar. 31, 2014
In Millions, unless otherwise specified	USD ($)	GBP (£)	USD ($)	London Interbank Offered Rate (LIBOR) [Member]	Subsequent Event [Member]
					USD ($)
Commitments And Contingencies [Line Items]	'	'	'	'	'
Maximum credit amount	$130	£ 78	'	'	$90
Amount outstanding	$55	'	$120	'	'
Basis spread on variable rate	'	'	'	7.00%	'
Interest rate	'	'	'	1.25%	'

Commitments_And_Contingencies_1

Commitments And Contingencies (LOC Procurement Agreement) (Details) (Procurement Agreement [Member], USD $)	Jan. 24, 2014	Jan. 09, 2013
Procurement Agreement [Member]	'	'
Commitments And Contingencies [Line Items]	'	'
Maximum credit amount	'	$33,000,000
LOC Procurement Agreement, outstanding and accrued fees	$200,000	'

Commitments_And_Contingencies_2

Commitments And Contingencies (Alba Reimbursement Agreement) (Details) (Alba Reimbursement Agreement [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2012	Jan. 24, 2013
Alba Reimbursement Agreement [Member]	'	'
Reimbursement Agreement [Line Items]	'	'
Reimbursement agreement related to abandonment liabilities	$120	'
Reimbursement agreement, outstanding and accrued fees	'	$122
Reimbursement agreement related to abandonment liabilities, annual fee	13.00%	'

Commitments_And_Contingencies_3

Commitments And Contingencies (Terminated Acquisition Of Marcellus Assets) (Details) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Jul. 17, 2011	Mar. 31, 2014	Apr. 16, 2014
			SM Energy Company	SM Energy Company	Subsequent Event [Member]
					SM Energy Litigation [Member]
Business Combination, Separately Recognized Transactions [Line Items]	'	'	'	'	'
Payment to acquire acquisitions	'	'	$110,000,000	'	'
Termination date	'	'	'	'December 14, 2011	'
Amount of deposit forfeited	'	'	'	'	6,000,000
Settlement amount	'	'	'	'	5,000,000
Note issuance amount	'	'	'	'	4,500,000
Value of common stock issued	50,000	47,000	'	'	'
Litigation settlement expense	$19,034,000	'	'	'	'

Guarantor_Subsidiaries_Balance

Guarantor Subsidiaries (Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Cash and cash equivalents	$55,490	$34,742	$80,781	$59,185
Accounts receivable	48,217	65,171	'	'
Prepaid expenses and other	82,896	60,318	'	'
Current Assets	186,603	160,231	'	'
Property, plant and equipment, net	1,053,775	1,072,151	'	'
Goodwill	259,238	259,238	'	'
Other assets	32,997	33,222	'	'
Total Assets	1,532,613	1,524,842	'	'
Accounts payable	56,199	38,033	'	'
Current maturities of debt	2,140	'	'	'
Deferred revenue	2,152	20,965	'	'
Monetary production payment, current portion	120,833	74,167	'	'
Accrued expenses and other	79,219	88,625	'	'
Current Liabilities	260,543	221,790	'	'
Long-term debt	891,829	870,878	'	'
Deferred taxes	173,847	146,213	'	'
Monetary production payment, long-term portion	40,833	92,500	'	'
Other liabilities	127,789	131,370	'	'
Total Liabilities	1,494,841	1,462,751	'	'
Series C convertible preferred stock	43,703	43,703	'	'
Stockholder's equity	-5,931	18,388	'	'
Total Liabilities and Equity	1,532,613	1,524,842	'	'
Eliminations [Member]	'	'	'	'
Current receivables due from affiliates	-905,967	-920,665	'	'
Current Assets	-905,967	-920,665	'	'
Long-term receivables due from affiliates	-500,000	-500,008	'	'
Investments in subsidiaries	-276,720	-276,728	'	'
Total Assets	-1,682,687	-1,697,401	'	'
Current liabilites due to affiliates	-905,967	-920,673	'	'
Current Liabilities	-905,967	-920,673	'	'
Long-term liabilities due from affiliates	-500,000	-500,000	'	'
Total Liabilities	-1,405,967	-1,420,673	'	'
Stockholder's equity	-276,720	-276,728	'	'
Total Liabilities and Equity	-1,682,687	-1,697,401	'	'
Endeavour International Corporation [Member]	'	'	'	'
Current receivables due from affiliates	850,227	853,900	'	'
Current Assets	850,227	853,900	'	'
Investments in subsidiaries	57,662	57,662	'	'
Other assets	19,619	20,518	'	'
Total Assets	927,508	932,080	'	'
Current liabilites due to affiliates	648	648	'	'
Accrued expenses and other	10,655	27,474	'	'
Current Liabilities	11,303	28,122	'	'
Long-term debt	691,483	678,850	'	'
Other liabilities	4,065	3,535	'	'
Total Liabilities	706,851	710,507	'	'
Series C convertible preferred stock	43,703	43,703	'	'
Stockholder's equity	176,954	177,870	'	'
Total Liabilities and Equity	927,508	932,080	'	'
Combined Guarantor Subsidiaries [Member]	'	'	'	'
Cash and cash equivalents	28,753	2,417	2,525	27,800
Accounts receivable	2,273	1,832	'	'
Current receivables due from affiliates	6,704	20,783	'	'
Prepaid expenses and other	813	594	'	'
Current Assets	38,543	25,626	'	'
Property, plant and equipment, net	88,421	87,313	'	'
Long-term receivables due from affiliates	500,000	500,000	'	'
Investments in subsidiaries	219,058	219,066	'	'
Other assets	56	6,056	'	'
Total Assets	846,078	838,061	'	'
Accounts payable	10,094	1,214	'	'
Current liabilites due to affiliates	899,237	899,853	'	'
Accrued expenses and other	6,345	3,353	'	'
Current Liabilities	915,676	904,420	'	'
Other liabilities	5,077	601	'	'
Total Liabilities	920,753	905,021	'	'
Stockholder's equity	-74,675	-66,960	'	'
Total Liabilities and Equity	846,078	838,061	'	'
Combined Non- Guarantor Subsidiaries [Member]	'	'	'	'
Cash and cash equivalents	26,737	32,325	78,256	31,385
Accounts receivable	45,944	63,339	'	'
Current receivables due from affiliates	49,036	45,982	'	'
Prepaid expenses and other	82,083	59,724	'	'
Current Assets	203,800	201,370	'	'
Property, plant and equipment, net	965,354	984,838	'	'
Goodwill	259,238	259,238	'	'
Long-term receivables due from affiliates	'	8	'	'
Other assets	13,322	6,648	'	'
Total Assets	1,441,714	1,452,102	'	'
Accounts payable	46,105	36,819	'	'
Current maturities of debt	2,140	'	'	'
Deferred revenue	2,152	20,965	'	'
Monetary production payment, current portion	120,833	74,167	'	'
Current liabilites due to affiliates	6,082	20,172	'	'
Accrued expenses and other	62,219	57,798	'	'
Current Liabilities	239,531	209,921	'	'
Long-term debt	200,346	192,028	'	'
Long-term liabilities due from affiliates	500,000	500,000	'	'
Deferred taxes	173,847	146,213	'	'
Monetary production payment, long-term portion	40,833	92,500	'	'
Other liabilities	118,647	127,234	'	'
Total Liabilities	1,273,204	1,267,896	'	'
Stockholder's equity	168,510	184,206	'	'
Total Liabilities and Equity	$1,441,714	$1,452,102	'	'

Guarantor_Subsidiaries_Income_

Guarantor Subsidiaries (Income Statement) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$94,163	$57,672
Operating expenses	27,170	17,490
DD&A expense	44,968	22,947
Impairment of oil and gas properties	'	3,534
General and administrative	4,849	5,482
Income (loss) From Operations	17,176	8,219
Unrealized (gains) losses on derivatives	2,659	1,580
Interest expense	-31,477	-21,438
Letter of credit fees	-3,789	-11,380
Loss on early extinguishment of debt	-3,543	'
Litigation settlement expense	-19,034	'
Unrealized foreign currency gains (losses)	-1,273	9,760
Other income (expense)	-2,020	122
Income (Loss) Before Income Taxes	-41,301	-13,137
Petroleum Revenue Tax ("PRT") Expense (Benefit)	1,725	628
Corporate Tax Expense	1,844	281
Total tax expense	3,569	909
Net income (loss)	-44,870	-14,046
Preferred stock dividends	456	456
Net income (loss) to common shareholders	-45,326	-14,502
Eliminations [Member]	'	'
Interest expense	15,000	15,000
Other income (expense)	-15,000	-15,000
Endeavour International Corporation [Member]	'	'
General and administrative	995	732
Income (loss) From Operations	-995	-732
Unrealized (gains) losses on derivatives	469	-700
Interest expense	-20,620	-20,160
Other income (expense)	-322	1
Income (Loss) Before Income Taxes	-21,468	-21,591
Net income (loss)	-21,468	-21,591
Preferred stock dividends	456	456
Net income (loss) to common shareholders	-21,924	-22,047
Combined Guarantor Subsidiaries [Member]	'	'
Revenue	1,947	2,536
Operating expenses	1,181	3,615
DD&A expense	721	1,139
Impairment of oil and gas properties	'	3,534
General and administrative	3,709	2,611
Income (loss) From Operations	-3,664	-8,363
Interest expense	578	603
Litigation settlement expense	-19,034	'
Unrealized foreign currency gains (losses)	'	-1
Other income (expense)	14,406	14,478
Income (Loss) Before Income Taxes	-7,714	6,717
Net income (loss)	-7,714	6,717
Net income (loss) to common shareholders	-7,714	6,717
Combined Non- Guarantor Subsidiaries [Member]	'	'
Revenue	92,216	55,136
Operating expenses	25,989	13,875
DD&A expense	44,247	21,808
General and administrative	145	2,139
Income (loss) From Operations	21,835	17,314
Unrealized (gains) losses on derivatives	2,190	2,280
Interest expense	-26,435	-16,881
Letter of credit fees	-3,789	-11,380
Loss on early extinguishment of debt	-3,543	'
Unrealized foreign currency gains (losses)	-1,273	9,761
Other income (expense)	-1,104	643
Income (Loss) Before Income Taxes	-12,119	1,737
Petroleum Revenue Tax ("PRT") Expense (Benefit)	1,725	628
Corporate Tax Expense	1,844	281
Total tax expense	3,569	909
Net income (loss)	-15,688	828
Net income (loss) to common shareholders	($15,688)	$828

Guarantor_Subsidiaries_Cash_Fl

Guarantor Subsidiaries (Cash Flow Statement) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:	'	'
Net loss	($44,870)	($14,046)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	44,968	22,947
Impairment of oil and gas properties	'	3,534
Deferred tax expense (benefit)	1,969	128
Unrealized (gains) losses on derivatives	-2,659	-1,580
Amortization of non-cash compensation	971	832
Amortization of loan costs and discount	6,705	3,439
Non-cash interest expense	1,883	2,274
Loss on early extinguishment of debt	6,856	'
Litigation settlement expense	19,034	'
Other	1,847	-4,723
Changes in operating assets and liabilities:	'	'
(Increase) decrease in receivables	19,001	15,829
(Increase) decrease in other current assets	-5,056	-11,359
Increase (decrease) in liabilities	-23,100	30,330
Net Cash Provided by (Used in) Operating Activities	27,549	47,605
Cash Flows From Investing Activities:	'	'
Capital expenditures	-28,845	-59,074
Proceeds from sales, net of cash	1,352	'
Increase in restricted cash	-2,457	'
Net Cash Used in Investing Activities	-29,950	-59,074
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	'
Proceeds from issuance of MPP	'	43,000
Repayments of MPP	-5,000	'
Financing costs paid	-9,273	-9,935
Other financing	-416	'
Net Cash Provided by (Used in) Financing Activities	23,149	33,065
Net Change in Cash and Cash Equivalents	20,748	21,596
Cash and Cash Equivalents, Beginning of Period	34,742	59,185
Cash and Cash Equivalents, End of Period	55,490	80,781
Eliminations [Member]	'	'
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Amortization of non-cash compensation	809	669
Changes in operating assets and liabilities:	'	'
Increase (decrease) in liabilities	-2,385	-669
Net Cash Provided by (Used in) Operating Activities	-1,576	'
Cash Flows From Investing Activities:	'	'
Capital expenditures	1,576	'
Net Cash Used in Investing Activities	1,576	'
Endeavour International Corporation [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net loss	-21,468	-21,591
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Unrealized (gains) losses on derivatives	-469	700
Amortization of non-cash compensation	162	163
Amortization of loan costs and discount	2,049	1,951
Other	'	43
Changes in operating assets and liabilities:	'	'
(Increase) decrease in other current assets	'	3,643
Increase (decrease) in liabilities	-17,438	-17,112
Net Cash Provided by (Used in) Operating Activities	-37,164	-32,203
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	-591
Intercompany cash management	8,160	32,794
Other financing	-416	'
Net Cash Provided by (Used in) Financing Activities	37,164	32,203
Combined Guarantor Subsidiaries [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net loss	-7,714	6,717
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	721	1,139
Impairment of oil and gas properties	'	3,534
Litigation settlement expense	19,034	'
Other	-4	-4
Changes in operating assets and liabilities:	'	'
(Increase) decrease in receivables	-852	275
(Increase) decrease in other current assets	-238	-15,057
Increase (decrease) in liabilities	20,381	52
Net Cash Provided by (Used in) Operating Activities	31,328	-3,344
Cash Flows From Investing Activities:	'	'
Capital expenditures	-15,328	-2,532
Proceeds from sales, net of cash	1,352	'
Net Cash Used in Investing Activities	-13,976	-2,532
Cash Flows From Financing Activities:	'	'
Intercompany cash management	8,984	-19,399
Net Cash Provided by (Used in) Financing Activities	8,984	-19,399
Net Change in Cash and Cash Equivalents	26,336	-25,275
Cash and Cash Equivalents, Beginning of Period	2,417	27,800
Cash and Cash Equivalents, End of Period	28,753	2,525
Combined Non- Guarantor Subsidiaries [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net loss	-15,688	828
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	44,247	21,808
Deferred tax expense (benefit)	1,969	128
Unrealized (gains) losses on derivatives	-2,190	-2,280
Amortization of loan costs and discount	4,656	1,488
Non-cash interest expense	1,883	2,274
Loss on early extinguishment of debt	6,856	'
Other	1,851	-4,762
Changes in operating assets and liabilities:	'	'
(Increase) decrease in receivables	19,853	15,554
(Increase) decrease in other current assets	-4,818	55
Increase (decrease) in liabilities	-23,658	48,059
Net Cash Provided by (Used in) Operating Activities	34,961	83,152
Cash Flows From Investing Activities:	'	'
Capital expenditures	-15,093	-56,542
Increase in restricted cash	-2,457	'
Net Cash Used in Investing Activities	-17,550	-56,542
Cash Flows From Financing Activities:	'	'
Repayments of borrowings	-115,163	'
Borrowings under debt agreements, net of debt discount	123,125	'
Proceeds from issuance of MPP	'	43,000
Repayments of MPP	-5,000	'
Financing costs paid	-8,817	-9,344
Intercompany cash management	-17,144	-13,395
Net Cash Provided by (Used in) Financing Activities	-22,999	20,261
Net Change in Cash and Cash Equivalents	-5,588	46,871
Cash and Cash Equivalents, Beginning of Period	32,325	31,385
Cash and Cash Equivalents, End of Period	$26,737	$78,256