PrimeEnergy Resources (PNRG) 10-Q 14 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	11-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	PNRG
Entity Registrant Name	PRIMEENERGY CORP
Entity Central Index Key	56868
Current Fiscal Year End Date	-19
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		2,314,094

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current Assets
Cash and cash equivalents	$5,678	$9,209
Restricted cash and cash equivalents	3,877	3,877
Accounts receivable, net	11,615	12,315
Derivative contracts	14,436	16,914
Other current assets	948	1,490
Total Current Assets	36,554	43,805
Property and Equipment, at cost
Oil and gas properties (successful efforts method), net	206,997	207,600
Field and office equipment, net	12,356	12,701
Total Property and Equipment, Net	219,353	220,301
Other Assets	722	794
Total Assets	256,629	264,900
Current Liabilities
Accounts payable	15,096	16,258
Accrued liabilities	6,487	12,401
Current portion of long-term debt	2,930	2,903
Current portion of asset retirement and other long-term obligations	1,366	1,366
Current portion of deferred tax liability	4,559	5,547
Derivative liability short-term	156	170
Due to related parties	1	45
Total Current Liabilities	30,595	38,690
Long-Term Bank Debt	98,908	98,490
Asset Retirement Obligations	11,276	11,269
Deferred Income Taxes	39,113	38,191
Total Liabilities	179,892	186,640
Commitments and Contingencies
Equity
Common stock, $.10 par value; Authorized: 4,000,000 shares, issued: 3,836,397 shares	383	383
Paid-in capital	7,185	7,186
Retained earnings	105,675	105,662
Accumulated other comprehensive loss, net	-100	-92
Treasury stock, at cost; 1,522,253 shares and 1,502,993 shares	-44,807	-43,527
Total Stockholders' Equity - PrimeEnergy	68,336	69,612
Non-controlling interest	8,401	8,648
Total Equity	76,737	78,260
Total Liabilities and Equity	$256,629	$264,900

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$0.10	$0.10
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	3,836,397	3,836,397
Treasury stock, shares	1,522,253	1,502,993

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues
Oil and gas sales	$12,298	$24,201
Realized gain (loss) on derivative instruments, net	5,143	-997
Field service income	5,541	6,772
Administrative overhead fees	2,233	2,284
Unrealized loss on derivative instruments, net	-2,466	-1,982
Other income	46	107
Total Revenues	22,795	30,385
Costs and Expenses
Lease operating expense	9,240	11,906
Field service expense	4,489	5,527
Depreciation, depletion, amortization and accretion on discounted liabilities	5,452	5,353
General and administrative expense	3,367	4,446
Total Costs and Expenses	22,548	27,232
Gain on Sale and Exchange of Assets	489	3,173
Income from Operations	736	6,326
Interest Expense	939	1,079
Income (Loss) Before Provision for Income Taxes	-203	5,247
Provision for Income Taxes	15	1,478
Net Income (Loss)	-218	3,769
Less: Net Income (Loss) Attributable to Non-Controlling Interests	-231	960
Net Income Attributable to PrimeEnergy	$13	$2,809
Basic Income Per Common Share	$0.01	$1.18
Diluted Income Per Common Share	$0	$0.90

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	($218)	$3,769
Other Comprehensive Loss, net of taxes:
Changes in fair value of hedge positions, net of taxes of $4 and $2, respectively	-8	-3
Total other comprehensive loss	-8	-3
Comprehensive Income (Loss)	-226	3,766
Less: Comprehensive Income (Loss) Attributable to Non-Controlling Interest	-231	960
Comprehensive Income Attributable to PrimeEnergy	$5	$2,806

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Changes in fair value of hedge positions, tax	$4	$2

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Equity (USD $)	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total Stockholders' Equity - PrimeEnergy [Member]	Non-Controlling Interest [Member]
In Thousands, except Share data
Balance at Dec. 31, 2014	$78,260	$383	$7,186	$105,662	($92)	($43,527)	$69,612	$8,648
Balance, shares at Dec. 31, 2014	3,836,397	3,836,397
Repurchase 19,260 shares of common stock	-1,280					-1,280	-1,280
Net loss	-218			13			13	-231
Other comprehensive loss, net of taxes	-8				-8		-8
Repurchase of non-controlling interests	-1		-1				-1
Distributions to non-controlling interests	-16							-16
Balance at Mar. 31, 2015	$76,737	$383	$7,185	$105,675	($100)	($44,807)	$68,336	$8,401
Balance, shares at Mar. 31, 2015	3,836,397	3,836,397

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2015
Repurchase of common stock, shares	19,260
Treasury Stock [Member]
Repurchase of common stock, shares	19,260
Total Stockholders' Equity - PrimeEnergy [Member]
Repurchase of common stock, shares	19,260

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income (loss)	($218)	$3,769
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion on discounted liabilities	5,452	5,353
Gain on sale of properties	-489	-3,173
Unrealized loss on derivative instruments, net	2,466	1,982
Provision (benefit) for deferred income taxes	-63	1,251
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	700	-171
Decrease in due from related parties	255	134
Decrease in other assets	302	191
Increase (decrease) in accounts payable	-1,162	1,141
Increase (decrease) in accrued liabilities	-5,914	653
Net Cash Provided by Operating Activities	1,329	11,130
Cash Flows from Investing Activities:
Capital expenditures, including exploration expense	-4,533	-7,864
Proceeds from sale of properties and equipment	525	3,283
Net Cash Used in Investing Activities	-4,008	-4,581
Cash Flows from Financing Activities:
Purchase of stock for treasury	-1,280	-1,046
Purchase of non-controlling interests	-1	-48
Proceeds from long-term bank debt and other long-term obligations	11,200	14,750
Repayment of long-term bank debt and other long-term obligations	-10,755	-19,211
Distribution to non-controlling interests	-16	-34
Net Cash Used in Financing Activities	-852	-5,589
Net Increase (Decrease) in Cash and Cash Equivalents	-3,531	960
Cash and Cash Equivalents at the Beginning of the Period	9,209	9,526
Cash and Cash Equivalents at the End of the Period	5,678	10,486
Supplemental Disclosures:
Income taxes paid	498	293
Interest paid	$1,237	$1,117

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	(1) Basis of Presentation:
	The accompanying condensed consolidated financial statements of PrimeEnergy Corporation (“PEC” or the “Company”) have not been audited by independent public accountants. Pursuant to applicable Securities and Exchange Commission (“SEC”) rules and regulations, the accompanying interim financial statements do not include all disclosures presented in annual financial statements and the reader should refer to the Company’s Form 10-K for the year ended December 31, 2014. In the opinion of management, the accompanying interim condensed consolidated financial statements contain all material adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the Company’s condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, the condensed consolidated results of operations, cash flows and equity for the three months ended March 31, 2015 and 2014. Certain amounts presented in prior period financial statements have been reclassified for consistency with current period presentation. The results for interim periods are not necessarily indicative of annual results. For purposes of disclosure in the condensed consolidated financial statements, subsequent events have been evaluated through the date the statements were issued.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle of the guidance is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The amendments in this update also require disclosure of sufficient information to allow users to understand the nature, amount, timing and uncertainty of revenue and cash flow arising from contracts. ASU 2014-09 is effective for annual and interim reporting periods beginning after December 15, 2016, and can be adopted either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Early application is not permitted. In April 2015, the FASB proposed to delay the effective date one year. The proposal will be subject to the FASB’s due process requirement, which includes a period for public comments. The Company is currently evaluating the effect that the adoption of ASU 2014-09 will have on the Company’s financial position, results of operations or cash flows.

Acquisitions_and_Dispositions

Acquisitions and Dispositions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions and Dispositions	(2) Acquisitions and Dispositions:
	Historically the Company has repurchased the interests of the partners and trust unit holders in the eighteen oil and gas limited partnerships (the “Partnerships”) and the two asset and business income trusts (the “Trusts”) managed by the Company as general partner and as managing trustee, respectively. The Company purchased such interests in amounts totaling $1,000 and $48,000 for the three months ended March 31, 2015 and 2014, respectively.

Restricted_Cash_and_Cash_Equiv

Restricted Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2015
Cash and Cash Equivalents [Abstract]
Restricted Cash and Cash Equivalents	(3) Restricted Cash and Cash Equivalents:
	Restricted cash and cash equivalents include $3.88 million at March 31, 2015 and December 31, 2014 of cash primarily pertaining to oil and gas revenue payments. There were corresponding accounts payable recorded at March 31, 2015 and December 31, 2014 for these liabilities. Both the restricted cash and the accounts payable are classified as current on the accompanying condensed consolidated balance sheets.

Additional_Balance_Sheet_Infor

Additional Balance Sheet Information	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Additional Balance Sheet Information	(4) Additional Balance Sheet Information:
	Certain balance sheet amounts are comprised of the following:
	(Thousands of dollars)	March 31,			December 31,
		2015			2014
	Accounts Receivable:
	Joint interest billing	$	2,901		$	2,882
	Trade receivables		1,734			1,980
	Oil and gas sales		5,607			6,245
	Other		1,877			1,751
			12,119			12,858
	Less: Allowance for doubtful accounts		(504	)		(543	)
	Total	$	11,615		$	12,315
	Accounts Payable:
	Trade	$	2,440		$	3,995
	Royalty and other owners		9,040			8,444
	Partner advances		1,726			1,344
	Prepaid drilling deposits		559			786
	Other		1,331			1,689
	Total	$	15,096		$	16,258
	Accrued Liabilities:
	Compensation and related expenses	$	2,731		$	2,350
	Property costs		3,087			9,204
	Income tax		130			554
	Other		539			293
	Total	$	6,487		$	12,401

Property_and_Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	(5) Property and Equipment:
	Property and equipment at March 31, 2015 and December 31, 2014 consisted of the following:
	(Thousands of dollars)	March 31,			December 31,
		2015			2014
	Proved oil and gas properties, at cost	$	400,527		$	396,588
	Less: Accumulated depletion and depreciation		(193,530	)		(188,988	)
	Oil and Gas Properties, Net	$	206,997		$	207,600
	Field and office equipment	$	27,800		$	27,403
	Less: Accumulated depreciation		(15,444	)		(14,702	)
	Field and Office Equipment, Net	$	12,356		$	12,701
	Total Property and Equipment, Net	$	219,353		$	220,301

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	(6) Long-Term Debt:
	Bank Debt:
	Effective July 30, 2010 the Company entered into a Second Amended and Restated Credit Agreement between Compass Bank as agent and a syndicated group of lenders (“Credit Agreement”). The Credit Agreement has a revolving line of credit and letter of credit facility of up to $250 million with a final maturity date of July 30, 2017. The credit facility is secured by substantially all of the Company’s oil and gas properties. The credit facility is subject to a borrowing base determined by the lenders taking into consideration the estimated value of PEC’s oil and gas properties in accordance with the lenders’ customary practices for oil and gas loans. This process involves reviewing PEC’s estimated proved reserves and their valuation. The borrowing base is redetermined semi-annually, and the available borrowing amount could be increased or decreased as a result of such redetermination. In addition, PEC and the lenders each have at their discretion the right to request the borrowing base be redetermined with a maximum of one such request each year. A revision to PEC’s reserves may prompt such a request on the part of the lenders, which could possibly result in a reduction in the borrowing base and availability under the credit facility. At any time if the sum of the outstanding borrowings and letter of credit exposures exceed the applicable portion of the borrowing base, PEC would be required to repay the excess amount within a prescribed period.
	At March 31, 2015, the credit facility borrowing base was $130.0 million with no required monthly reduction amount. The borrowings made within the credit facility may be placed in a base rate loan or LIBO rate loan. The Company’s borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at March 31, 2015) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.00% at March 31, 2015). At March 31, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.91%, respectively.
	At March 31, 2015, the Company had $90.0 million of borrowings outstanding under its revolving credit facility at a weighted-average interest rate of 3.46% and $40.0 million available for future borrowings. The combined weighted average interest rate paid on outstanding bank borrowings subject to base rate and LIBO interest was 3.41% for the three months ended March 31, 2015 as compared to 3.55% for the three months ended March 31, 2014.
	The Company entered into interest rate hedge agreements to help manage interest rate exposure. These contracts include interest rate swaps. Interest rate swap transactions generally involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. In July 2012, the Company entered into interest swap agreements for a period of two years, which commenced in January 2014, related to $75 million of the Company’s bank debt resulting in a LIBO fixed rate of 0.563%. The Company recorded interest expense and paid $74,000 and $54,000 related to the settlement of interest rate swaps for the three months ended March 31, 2015 and 2014, respectively.
	Equipment Loans:
	On July 31, 2013, the Company entered into a $10.0 million Loan and Security Agreement with JP Morgan Chase Bank (“Equipment Loan”). The Equipment Loan is secured by a portion of the Company’s field service equipment, carries an interest rate of 3.95% per annum, requires monthly payments (principal and interest) of $184,000, and has a final maturity date of July 31, 2018. As of March 31, 2015, the Company had a total of $7.0 million outstanding on this Equipment Loan.
	On July 29, 2014, the Company entered into additional equipment financing facilities totaling $6.0 million with JP Morgan Chase Bank. In August 2014, the Company drew down $4.8 million of this facility that is secured by field service equipment, carries an interest rate of 3.40% per annum, requires monthly payments (principal and interest) of $87,800, and has a final maturity date of July 31, 2019. The remaining $1.2 million under this facility is available to finance the acquisition of any future field service equipment. In December 2014, the Company drew down an additional $0.5 million of this facility that is secured by recently purchased field service equipment. Interim draws on this facility carry a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and in July 2015 will convert along with subsequent draws, if any, into a fixed term loan requiring monthly payments (principal and interest) and a final maturity date of June 30, 2020. As of March 31, 2015, the Company had a total of $4.8 million outstanding on this facility.

Other_LongTerm_Obligations_and

Other Long-Term Obligations and Commitments	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Other Long-Term Obligations and Commitments	(7) Other Long-Term Obligations and Commitments:
	Operating Leases:
	The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. The future minimum lease payments for the rest of fiscal 2015 and thereafter for the operating leases are as follows:
	(Thousands of dollars)	Operating
		Leases
	2015	$	460
	2016		546
	2017		46
	Total minimum payments	$	1,052
	Rent expense for office space for the three months ended March 31, 2015 and 2014 was $263,000 and $164,000, respectively.
	Asset Retirement Obligation:
	A reconciliation of the liability for plugging and abandonment costs for the three months ended March 31, 2015 is as follows:
	(Thousands of dollars)
	Asset retirement obligation – December 31, 2014	$	12,501
	Liabilities incurred		60
	Liabilities settled		(477	)
	Accretion expense		133
	Asset retirement obligation – March 31, 2015	$	12,217
	The Company’s liability is determined using significant assumptions, including current estimates of plugging and abandonment costs, annual inflation of these costs, the productive life of wells and a risk-adjusted interest rate. Changes in any of these assumptions can result in significant revisions to the estimated asset retirement obligation. Revisions to the asset retirement obligation are recorded with an offsetting change to producing properties, resulting in prospective changes to depreciation, depletion and amortization expense and accretion of discount. Because of the subjectivity of assumptions and the relatively long life of most of the Company’s wells, the costs to ultimately retire the wells may vary significantly from previous estimates.

Contingent_Liabilities

Contingent Liabilities	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities	(8) Contingent Liabilities:
	The Company, as managing general partner of the affiliated Partnerships, is responsible for all Partnership activities, including the drilling of development wells and the production and sale of oil and gas from productive wells. The Company also provides the administration, accounting and tax preparation work for the Partnerships, and is liable for all debts and liabilities of the affiliated Partnerships, to the extent that the assets of a given limited Partnership are not sufficient to satisfy its obligations. At March 31, 2015, the affiliated Partnerships have established cash reserves in excess of their debts and liabilities and the Company believes these reserves will be sufficient to satisfy Partnership obligations.
	The Company is subject to environmental laws and regulations. Management believes that future expenses, before recoveries from third parties, if any, will not have a material effect on the Company’s financial condition. This opinion is based on expenses incurred to date for remediation and compliance with laws and regulations, which have not been material to the Company’s results of operations.
	From time to time, the Company is party to certain legal actions arising in the ordinary course of business. While the outcome of these events cannot be predicted with certainty, management does not expect these matters to have a materially adverse effect on the financial position or results of operations of the Company.

Stock_Options_and_Other_Compen

Stock Options and Other Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Other Compensation	(9) Stock Options and Other Compensation:
	In May 1989, non-statutory stock options were granted by the Company to four key executive officers for the purchase of shares of common stock. At March 31, 2015 and 2014, remaining options held by two key executive officers on 767,500 shares were outstanding and exercisable at prices ranging from $1.00 to $1.25. According to their terms, the options have no expiration date.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	(10) Related Party Transactions:
	The Company, as managing general partner or managing trustee, makes an annual offer to repurchase the interests of the partners and trust unit holders in certain of the Partnerships or Trusts. The Company purchased such interests in amounts totaling $1,000 and $48,000 for the three months ended March 31, 2015 and 2014, respectively.
	Treasury stock purchases in any reported period may include shares from a related party, which may include members of the Company’s Board of Directors.
	Receivables from related parties consist of reimbursable general and administrative costs, lease operating expenses and reimbursement for property development and related costs. These receivables are due from joint venture partners, which may include members of the Company’s Board of Directors.
	Payables owed to related parties primarily represent receipts collected by the Company as agent for the joint venture partners, which may include members of the Company’s Board of Directors, for oil and gas sales net of expenses.

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Financial Instruments	(11) Financial Instruments:
	Fair Value Measurements:
	Authoritative guidance on fair value measurements defines fair value, establishes a framework for measuring fair value and stipulates the related disclosure requirements. The Company follows a three-level hierarchy, prioritizing and defining the types of inputs used to measure fair value. The fair values of the Company’s interest rate swaps, natural gas and crude oil price collars and swaps are designated as Level 3. The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
	March 31, 2015		Quoted Prices in				Significant				Significant			Balance as of
			Active Markets				Other				Unobservable			March 31,
			For Identical				Observable				Inputs (Level 3)			2015
			Assets (Level 1)				Inputs (Level 2)
	(Thousands of dollars)
	Assets
	Commodity derivative contracts		$	—			$	—			$	14,436		$	14,436
	Interest rate derivative contracts			—				—				—			—
	Total assets		$	—			$	—			$	14,436		$	14,436
	Liabilities
	Interest rate derivative contracts		$	—			$	—			$	(156	)	$	(156	)
	Total liabilities		$	—			$	—			$	(156	)	$	(156	)
	December 31, 2014		Quoted Prices in				Significant				Significant			Balance as of
			Active Markets				Other				Unobservable			December 31,
			For Identical				Observable				Inputs (Level 3)			2014
			Assets (Level 1)				Inputs (Level 2)
	(Thousands of dollars)
	Assets
	Commodity derivative contracts		$	—			$	—			$	16,901		$	16,901
	Interest rate derivative contracts			—				—				26			26
	Total assets		$	—			$	—			$	16,927		$	16,927
	Liabilities
	Interest rate derivative contracts		$	—			$	—			$	(170	)	$	(170	)
	Total liabilities		$	—			$	—			$	(170	)	$	(170	)
	The derivative contracts were measured based on quotes from the Company’s counterparties. Such quotes have been derived using valuation models that consider various inputs including current market and contractual prices for the underlying instruments, quoted forward prices for natural gas and crude oil, volatility factors and interest rates, such as a LIBOR curve for a similar length of time as the derivative contract term as applicable. These estimates are verified using comparable NYMEX futures contracts or are compared to multiple quotes obtained from counterparties for reasonableness.
	The significant unobservable inputs for Level 3 derivative contracts include basis differentials and volatility factors. An increase (decrease) in these unobservable inputs would result in an increase (decrease) in fair value, respectively. The Company does not have access to the specific assumptions used in its counterparties’ valuation models. Consequently, additional disclosures regarding significant Level 3 unobservable inputs were not provided.
	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the three months ended March 31, 2015.
	(Thousands of dollars)
	Net assets – December 31, 2014		$	16,757
	Total realized and unrealized (gains) losses:
	Included in earnings (a)			2,603
	Included in other comprehensive loss			(12	)
	Purchases, sales, issuances and settlements			(5,068	)
	Net assets – March 31, 2015		$	14,280
	(a)	Derivative instruments are reported in revenues as realized gain/loss and on a separately reported line item captioned unrealized gain/loss on derivative instruments, and interest rate swap instruments are reported as an increase or reduction to interest expense.
	Derivative Instruments:
	The Company is exposed to commodity price and interest rate risk, and management considers periodically the Company’s exposure to cash flow variability resulting from the commodity price changes and interest rate fluctuations. Futures, swaps and options are used to manage the Company’s exposure to commodity price risk inherent in the Company’s oil and gas production operations. The Company does not apply hedge accounting to any of its commodity based derivatives. Both realized and unrealized gains and losses associated with derivative instruments are recognized in earnings.
	Interest rate swap derivatives are treated as cash-flow hedges and are used to fix or float interest rates on existing debt. The value of these interest rate swaps at March 31, 2015 and December 31, 2014 are located in accumulated other comprehensive loss, net of tax. Settlement of the swaps are recorded within interest expense.
	The following table sets forth the effect of derivative instruments on the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014:
					Fair Value
	(Thousands of dollars)		Balance Sheet Location		March 31,				December 31,
					2015				2014
	Asset Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative contracts		$	—			$	12
	Interest rate swap contracts		Other assets			—				13
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Derivative contracts			12,356				14,629
	Natural gas commodity contracts		Derivative contracts			2,080				2,273
	Total				$	14,436			$	16,927
	Liability Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative liability short-term		$	(156	)		$	(170	)
	Total				$	(156	)		$	(170	)
	Total derivative instruments				$	14,280			$	16,757
	The following table sets forth the effect of derivative instruments on the condensed consolidated statement of operations for the three-month periods ended March 31, 2015 and 2014:
			Location of gain/loss recognized		Amount of gain/loss
			in income		recognized in income
	(Thousands of dollars)				2015				2014
	Derivative designated as cash-flow hedge instruments:
	Interest rate swap contracts		Interest expense		$	(74	)		$	(54	)
Derivatives not designated as cash-flow hedge instruments
Natural gas commodity contracts		Unrealized loss on derivative			(193	)			(504	)
		instruments, net
Crude oil commodity contracts		Unrealized loss on derivative			(2,273	)			(1,478	)
		instruments, net
Natural gas commodity contracts (a)		Realized gain (loss) on			592				(243	)
		derivative instruments, net
Crude oil commodity contracts		Realized gain (loss) on			4,551				(754	)
		derivative instruments, net
				$	2,603			$	(3,033	)
(a)	In January 2014, the Company unwound and monetized natural gas swaps with original settlement dates from January 2015 through December 2015 for net proceeds of $276,000. The $276,000 gain associated with this early settlement transaction is included in realized gain on derivative instruments for the three months ended March 31, 2014.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	(12) Earnings Per Share:
	Basic earnings per share are computed by dividing earnings available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect per share amounts that would have resulted if dilutive potential common stock had been converted to common stock in gain periods. The following reconciles amounts reported in the financial statements:
		Three Months Ended March 31,
		2015						2014
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	13		2,318,348	$	0.01	$	2,809		2,380,536	$	1.18
	Effect of dilutive securities:
	Options		—		753,636				—		751,836
	Diluted	$	13		3,071,984	$	0	$	2,809		3,132,372	$	0.9

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle of the guidance is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The amendments in this update also require disclosure of sufficient information to allow users to understand the nature, amount, timing and uncertainty of revenue and cash flow arising from contracts. ASU 2014-09 is effective for annual and interim reporting periods beginning after December 15, 2016, and can be adopted either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Early application is not permitted. In April 2015, the FASB proposed to delay the effective date one year. The proposal will be subject to the FASB’s due process requirement, which includes a period for public comments. The Company is currently evaluating the effect that the adoption of ASU 2014-09 will have on the Company’s financial position, results of operations or cash flows.

Additional_Balance_Sheet_Infor1

Additional Balance Sheet Information (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Balance Sheet Amounts	Certain balance sheet amounts are comprised of the following:
	(Thousands of dollars)	March 31,			December 31,
		2015			2014
	Accounts Receivable:
	Joint interest billing	$	2,901		$	2,882
	Trade receivables		1,734			1,980
	Oil and gas sales		5,607			6,245
	Other		1,877			1,751
			12,119			12,858
	Less: Allowance for doubtful accounts		(504	)		(543	)
	Total	$	11,615		$	12,315
	Accounts Payable:
	Trade	$	2,440		$	3,995
	Royalty and other owners		9,040			8,444
	Partner advances		1,726			1,344
	Prepaid drilling deposits		559			786
	Other		1,331			1,689
	Total	$	15,096		$	16,258
	Accrued Liabilities:
	Compensation and related expenses	$	2,731		$	2,350
	Property costs		3,087			9,204
	Income tax		130			554
	Other		539			293
	Total	$	6,487		$	12,401

Property_and_Equipment_Tables

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Property and equipment at March 31, 2015 and December 31, 2014 consisted of the following:
	(Thousands of dollars)	March 31,			December 31,
		2015			2014
	Proved oil and gas properties, at cost	$	400,527		$	396,588
	Less: Accumulated depletion and depreciation		(193,530	)		(188,988	)
	Oil and Gas Properties, Net	$	206,997		$	207,600
	Field and office equipment	$	27,800		$	27,403
	Less: Accumulated depreciation		(15,444	)		(14,702	)
	Field and Office Equipment, Net	$	12,356		$	12,701
	Total Property and Equipment, Net	$	219,353		$	220,301

Other_LongTerm_Obligations_and1

Other Long-Term Obligations and Commitments (Tables)	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases	The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. The future minimum lease payments for the rest of fiscal 2015 and thereafter for the operating leases are as follows:
	(Thousands of dollars)	Operating
		Leases
	2015	$	460
	2016		546
	2017		46
	Total minimum payments	$	1,052
Reconciliation of Liability for Plugging and Abandonment Costs	A reconciliation of the liability for plugging and abandonment costs for the three months ended March 31, 2015 is as follows:
	(Thousands of dollars)
	Asset retirement obligation – December 31, 2014	$	12,501
	Liabilities incurred		60
	Liabilities settled		(477	)
	Accretion expense		133
	Asset retirement obligation – March 31, 2015	$	12,217

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
	March 31, 2015		Quoted Prices in				Significant				Significant			Balance as of
			Active Markets				Other				Unobservable			March 31,
			For Identical				Observable				Inputs (Level 3)			2015
			Assets (Level 1)				Inputs (Level 2)
	(Thousands of dollars)
	Assets
	Commodity derivative contracts		$	—			$	—			$	14,436		$	14,436
	Interest rate derivative contracts			—				—				—			—
	Total assets		$	—			$	—			$	14,436		$	14,436
	Liabilities
	Interest rate derivative contracts		$	—			$	—			$	(156	)	$	(156	)
	Total liabilities		$	—			$	—			$	(156	)	$	(156	)
	December 31, 2014		Quoted Prices in				Significant				Significant			Balance as of
			Active Markets				Other				Unobservable			December 31,
			For Identical				Observable				Inputs (Level 3)			2014
			Assets (Level 1)				Inputs (Level 2)
	(Thousands of dollars)
	Assets
	Commodity derivative contracts		$	—			$	—			$	16,901		$	16,901
	Interest rate derivative contracts			—				—				26			26
	Total assets		$	—			$	—			$	16,927		$	16,927
	Liabilities
	Interest rate derivative contracts		$	—			$	—			$	(170	)	$	(170	)
	Total liabilities		$	—			$	—			$	(170	)	$	(170	)
Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the three months ended March 31, 2015.
	(Thousands of dollars)
	Net assets – December 31, 2014		$	16,757
	Total realized and unrealized (gains) losses:
	Included in earnings (a)			2,603
	Included in other comprehensive loss			(12	)
	Purchases, sales, issuances and settlements			(5,068	)
	Net assets – March 31, 2015		$	14,280
	(a)	Derivative instruments are reported in revenues as realized gain/loss and on a separately reported line item captioned unrealized gain/loss on derivative instruments, and interest rate swap instruments are reported as an increase or reduction to interest expense.
Effect of Derivative Instruments on Consolidated Balance Sheets	The following table sets forth the effect of derivative instruments on the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014:
					Fair Value
	(Thousands of dollars)		Balance Sheet Location		March 31,				December 31,
					2015				2014
	Asset Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative contracts		$	—			$	12
	Interest rate swap contracts		Other assets			—				13
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Derivative contracts			12,356				14,629
	Natural gas commodity contracts		Derivative contracts			2,080				2,273
	Total				$	14,436			$	16,927
	Liability Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative liability short-term		$	(156	)		$	(170	)
	Total				$	(156	)		$	(170	)
	Total derivative instruments				$	14,280			$	16,757
Effect of Derivative Instruments on Consolidated Statements of Operations	The following table sets forth the effect of derivative instruments on the condensed consolidated statement of operations for the three-month periods ended March 31, 2015 and 2014:
			Location of gain/loss recognized		Amount of gain/loss
			in income		recognized in income
	(Thousands of dollars)				2015				2014
	Derivative designated as cash-flow hedge instruments:
	Interest rate swap contracts		Interest expense		$	(74	)		$	(54	)
	Derivatives not designated as cash-flow hedge instruments
	Natural gas commodity contracts		Unrealized loss on derivative			(193	)			(504	)
			instruments, net
	Crude oil commodity contracts		Unrealized loss on derivative			(2,273	)			(1,478	)
			instruments, net
	Natural gas commodity contracts (a)		Realized gain (loss) on			592				(243	)
			derivative instruments, net
	Crude oil commodity contracts		Realized gain (loss) on			4,551				(754	)
			derivative instruments, net
					$	2,603			$	(3,033	)
	(a)	In January 2014, the Company unwound and monetized natural gas swaps with original settlement dates from January 2015 through December 2015 for net proceeds of $276,000. The $276,000 gain associated with this early settlement transaction is included in realized gain on derivative instruments for the three months ended March 31, 2014.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings (Loss) per Share	The following reconciles amounts reported in the financial statements:
		Three Months Ended March 31,
		2015						2014
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	13		2,318,348	$	0.01	$	2,809		2,380,536	$	1.18
	Effect of dilutive securities:
	Options		—		753,636				—		751,836
	Diluted	$	13		3,071,984	$	0	$	2,809		3,132,372	$	0.9

Acquisitions_and_Dispositions_

Acquisitions and Dispositions - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Trust
	Partnership
Business Combinations [Abstract]
Number of limited partnerships	18
Number of business income trusts	2
Purchase of non-controlling interests	$1	$48

Restricted_Cash_and_Cash_Equiv1

Restricted Cash and Cash Equivalents - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Cash and Cash Equivalents [Abstract]
Restricted cash and cash equivalents pertaining to oil and gas revenue payments	$3.88	$3.88

Additional_Balance_Sheet_Infor2

Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts Receivable:
Joint interest billing	$2,901	$2,882
Trade receivables	1,734	1,980
Oil and gas sales	5,607	6,245
Other	1,877	1,751
Accounts Receivable, Gross	12,119	12,858
Less: Allowance for doubtful accounts	-504	-543
Total	11,615	12,315
Accounts Payable:
Trade	2,440	3,995
Royalty and other owners	9,040	8,444
Partner advances	1,726	1,344
Prepaid drilling deposits	559	786
Other	1,331	1,689
Total	15,096	16,258
Accrued Liabilities:
Compensation and related expenses	2,731	2,350
Property costs	3,087	9,204
Income tax	130	554
Other	539	293
Total	$6,487	$12,401

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Proved oil and gas properties, at cost	$400,527	$396,588
Less: Accumulated depletion and depreciation	-193,530	-188,988
Oil and Gas Properties, Net	206,997	207,600
Field and office equipment	27,800	27,403
Less: Accumulated depreciation	-15,444	-14,702
Field and Office Equipment, Net	12,356	12,701
Total Property and Equipment, Net	$219,353	$220,301

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Aug. 31, 2014	Jul. 31, 2015	Jul. 31, 2013	Jul. 29, 2014
Debt Instrument [Line Items]
Credit facility borrowing capacity	$250,000,000
Maturity date of amended and restated credit agreement	30-Jul-17
Credit facility borrowing base	130,000,000
Credit facility, interest rate description	The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at March 31, 2015) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.00% at March 31, 2015). At March 31, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.91%, respectively.
Percentage for base rate loans at the prime rate	3.25%
Minimum range for applicable margin utilization rate	1.50%
Maximum range for applicable margin utilization rate	2.00%
Debt instrument interest one base rate basis for effective rate	5.00%
Effective LIBOR loan rate	2.91%
Outstanding borrowings under revolving credit facility	90,000,000
Weighted-average interest rate of borrowings	3.46%
Credit facility remaining borrowing capacity	40,000,000
Debt instrument basis weighted average interest rate spread on variable rate	3.41%	3.55%
Interest swap agreements period	2 years
Settlement of interest rate swaps	74,000	54,000
Equipment Loan [Member]
Debt Instrument [Line Items]
Percentage for base rate loans at the prime rate	3.95%
Company's bank debt	7,000,000
Equipment Loan, face amount						10,000,000
Equipment Loan, monthly payment	184,000
Equipment Loan, maturity date	31-Jul-18
Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Percentage for base rate loans at the prime rate	3.40%
Credit facility remaining borrowing capacity	1,200,000
Company's bank debt	4,800,000
Equipment Loan, face amount							6,000,000
Equipment Loan, monthly payment	87,800
Equipment Loan, maturity date	31-Jul-19
Additional equipment Loan, drawings			500,000	4,800,000
Equipment Loan, interest rate description	Interim draws on this facility carry a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and in July 2015 will convert along with subsequent draws
Additional Equipment Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
LIBOR rate loans	2.50%
Scenario, Forecast [Member] | Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Equipment Loan, maturity date					30-Jun-20
Minimum [Member]
Debt Instrument [Line Items]
LIBOR rate loans	2.50%
Maximum [Member]
Debt Instrument [Line Items]
LIBOR rate loans	3.00%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Percentage for base rate loans at the prime rate	0.56%
Swap agreement date	2012-07
Commenced date	2014-01
Company's bank debt	$75,000,000

Other_LongTerm_Obligations_and2

Other Long-Term Obligations and Commitments - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Lease period description	Term of more than one year
Rent expense for office space	$263	$164

Other_LongTerm_Obligations_and3

Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$460
2016	546
2017	46
Total minimum payments	$1,052

Other_LongTerm_Obligations_and4

Other Long-Term Obligations and Commitments - Reconciliation of Liability for Plugging and Abandonment Costs (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Asset retirement obligation at beginning of period	$12,501
Liabilities incurred	60
Liabilities settled	-477
Accretion expense	133
Asset retirement obligation at end of period	$12,217

Stock_Options_and_Other_Compen1

Stock Options and Other Compensation - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014	31-May-89
	Officers	Officers	Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	767,500	767,500
Options exercisable, shares	767,500	767,500
Number of key executive officers to whom non-statutory stock options granted	2	2	4
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price	1	1
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price	1.25	1.25

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Related Party Transactions [Abstract]
Repurchase interests of partners and trust unit holders	$1	$48

Financial_Instruments_Schedule

Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Derivative assets	$14,436	$16,927
Liabilities
Derivative liabilities	-156	-170
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	14,436	16,927
Liabilities
Derivative liabilities	-156	-170
Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	14,436	16,901
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		26
Liabilities
Derivative liabilities	-156	-170
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	14,436	16,927
Liabilities
Derivative liabilities	-156	-170
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	14,436	16,901
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		26
Liabilities
Derivative liabilities	($156)	($170)

Financial_Instruments_Schedule1

Financial Instruments - Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net assets (liabilities) at beginning of period	$16,757
Total realized and unrealized (gains) losses:
Included in earnings	2,603
Included in other comprehensive loss	-12
Purchases, sales, issuances and settlements	-5,068
Net assets (liabilities) at end of period	$14,280

Financial_Instruments_Effect_o

Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative assets	$14,436	$16,927
Derivative liabilities	-156	-170
Total derivative instruments	14,280	16,757
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		12
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		13
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Derivative Liability Short-Term [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	-156	-170
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	12,356	14,629
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$2,080	$2,273

Financial_Instruments_Effect_o1

Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$2,603	($3,033)
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	-74	-54
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized Loss on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	-193	-504
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	592	-243
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized Loss on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	-2,273	-1,478
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$4,551	($754)

Financial_Instruments_Effect_o2

Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Parenthetical) (Detail) (USD $)	1 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Fair Value Disclosures [Abstract]
Swaps, settlement dates description		January 2015 through December 2015
Net proceeds from derivative instruments	$276
Gains on settlement of derivative instruments			$276

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net Income, Basic	$13	$2,809
Net Income, Diluted	$13	$2,809
Weighted Average Number of Shares Outstanding, Basic	2,318,348	2,380,536
Weighted Average Number of Shares Outstanding, Options	753,636	751,836
Weighted Average Number of Shares Outstanding, Diluted	3,071,984	3,132,372
Per Share Amount, Basic	$0.01	$1.18
Per Share Amount, Diluted	$0	$0.90