Amendment Flag
Current Fiscal Year End Date
Document Period End Date
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Registrant Name
Entity Central Index Key
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Type
Summary of Significant Accounting Policies [Abstract]
Accounts Receivable [Member]
Accounts payable - related party
Accounts payable
Accounts receivable, net of allowance for doubtful accounts of $225 and $206, respectively
Accrued and other liabilities
Estimated expenses and liabilities [Abstract]
Estimated expenses and liabilities
Less - Accumulated depreciation, depletion and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Contributed capital
Contributed Capital [Member]
Adjustments to reconcile net earnings to net cash from operating activities -
Affiliated Entities [Member]
Affiliated Entity [Member]
Cash and other [Member]
Other Segments [Member]
Balance, end of year
Balance, beginning of year
Allowance for Doubtful Accounts Receivable
Allowance for Doubtful Accounts [Abstract]
Changes in the allowance for doubtful accounts [Roll Forward]
Allowance for doubtful accounts
Less: Write-offs and recoveries
Allowance for Doubtful Accounts Receivable, Recoveries
Advanced royalty payment
Balance on January 1
Balance on December 31
Asset Retirement Obligation
Property impairments
Asset Retirement Obligations
Asset Retirement Obligations, Policy [Policy Text Block]
Liabilities incurred
Asset retirement obligations
Liabilities settled
Asset Retirement Obligation, Liabilities Settled
Accretion of discount
Asset Retirement Obligation, Accretion Expense
Company's asset retirement obligations [Roll Forward]
Total assets
Assets
Assets
ASSETS
ASSETS
Assets [Abstract]
CURRENT ASSETS:
Assets, Current [Abstract]
OTHER ASSETS:
Total current assets
Assets, Current
Average sales prices
Oil and Gas Production Type [Axis]
Average Sales Price and Production Costs Per Unit of Production [Table]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Percentage of member interest acquired
Voting interest
Business Acquisition [Line Items]
Counterparty Name [Axis]
Report Date [Axis]
Report Date [Axis]
Property and equipment additions
Capital Expenditures Incurred but Not yet Paid
Proved oil and gas properties
Accumulated depreciation, depletion and amortization
Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities
Capitalized costs relating to oil and gas producing activities [Abstract]
Capitalized Costs, Oil and Gas Producing Activities, Net [Abstract]
Unproved oil and gas properties
Net capitalized cost
Capitalized Costs, Oil and Gas Producing Activities, Net
Gross capitalized cost
Capitalized Costs, Oil and Gas Producing Activities, Gross
Capitalized costs relating to oil and gas producing activities
Cash and Cash Equivalents
Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and cash equivalents at end of year
Cash and cash equivalents at beginning of year
Cash and cash equivalents
Increase (decrease) in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
COMMITMENTS AND CONTINGENCIES (NOTE 6)
Commitments and Contingencies
Commitments and Contingencies [Abstract]
Commodity Purchases [Member]
Commodity Contract [Member]
Commodity Contract [Member]
Dividends declared per common share (in dollars per share)
Common Stock [Member]
Dividends, Per share (in dollars per share)
Common stock - shares issued (in shares)
Common stock - shares authorized (in shares)
Common stock - $.10 par value, 7,500,000 shares authorized, 4,217,596 shares outstanding
Common stock - par value (in dollars per share)
Common stock - shares outstanding (in shares)
Employee Benefits [Abstract]
Components of the Company's income tax (provision) benefit [Abstract]
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Components of the federal deferred tax asset (liability) [Abstract]
Components of Deferred Tax Assets and Liabilities [Abstract]
Concentration Risk by Benchmark [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration of Credit Risk
Concentration Risk Disclosure [Text Block]
Concentration Risk [Line Items]
Concentration Risk [Line Items]
Concentration Risk Benchmark [Domain]
Concentration Risk [Table]
Concentration Risk Type [Domain]
Concentration risk, percentage
Principles of Consolidation
Consolidation Items [Axis]
Consolidation Items [Domain]
Long-term non-cancelable operating leases and terminal arrangements for the next five years
Parental guaranteed obligations [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Cost incurred in oil and gas exploration and development activities
Development costs
Property acquisition costs [Abstract]
COSTS AND EXPENSES:
Proved
Total costs incurred
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities
Total costs and expenses
Costs and Expenses
Unproved
Crude Oil [Member]
Crude Oil and NGL [Member]
Current
Current Income Tax Expense (Benefit)
Customer Concentration Risk [Member]
Financial Statement Filing Date [Domain]
Deferred income tax (provision) benefit
Deferred Federal, State and Local, Tax Expense (Benefit)
Deferred taxes and other liabilities
Federal
Deferred Federal Income Tax Expense (Benefit)
Deferred
Deferred Income Tax Expense (Benefit)
Equity method investment
State
Deferred State and Local Income Tax Expense (Benefit)
Other
Deferred Tax Assets, Other
Net deferred tax liability
Deferred Tax Liabilities, Net
Net long-term deferred tax liability
Deferred Tax Liabilities, Net, Noncurrent
Property
Deferred Tax Liabilities, Property, Plant and Equipment
Contributory expenses
Defined Contribution Plan, Cost Recognized
Depletion taken
Depletion of Oil and Gas Properties
Insurance collateral deposits
Depreciation, depletion and amortization
Depreciation, depletion and amortization
Depreciation, depletion and amortization
Derivative Instrument Risk [Axis]
Liability Derivatives
Derivative Asset, Fair Value, Gross Liability
Derivatives (fair value contracts) - Current assets
Net Value
Net Fair Value January 1
Net Fair Value December 31
Derivative Assets (Liabilities), at Fair Value, Net
Derivatives (fair value contracts) - Current liabilities
Derivative Liability
Number of contracts held
Earnings
Derivative, Gain (Loss) on Derivative, Net
Asset Derivatives
Derivative Asset, Fair Value, Gross Asset
Less Counterparty Offsets
Derivative Liability, Fair Value, Amount Offset Against Collateral
Fair Value Forward Hydrocarbon Commodity Contracts at gross valuation [Abstract]
Earnings (loss) recognized in income [Abstract]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Contract [Domain]
Less Counterparty Offsets
Derivative, Fair Value, Amount Offset Against Collateral, Net
Derivative Instruments, Gain (Loss) [Table]
Derivatives, Fair Value [Line Items]
Use of Derivative Instruments
Derivatives, Reporting of Derivative Activity [Policy Text Block]
Earnings (loss) from discontinued operations, tax
From discontinued operations
Discontinued Operation, Tax Effect of Discontinued Operation
Discontinued Operations [Abstract]
Pre-tax earnings from discontinued operation
Standardized measure of discounted future net cash flows [Abstract]
Discontinued Operations
Dividends paid on common stock
Dividends, Common Stock, Cash
Basic and diluted net earnings per share (in dollars per share)
Net Earnings (Loss), Per Share (in dollars per share)
Earnings Per Share, Basic and Diluted
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
EARNINGS (LOSS) PER SHARE:
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Fair value contracts
As Reported Fair Value Contracts
Energy Marketing Contracts Assets, Current
Inventories
Fair value contracts
As Reported Fair Value Contracts
Equity Component [Domain]
Impairment of equity investment
Pre-tax impairment charge
Investments
Equity and Cost Method Investments, Policy [Policy Text Block]
Percentage of equity method investment
Expensed
Exploration and Production Costs
New field discoveries and extensions, net of future production costs
Fair Value, Hierarchy [Axis]
Measurement Frequency [Axis]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Hierarchy [Domain]
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Level 3 Unobservable [Member]
Level 1 Quoted Prices [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 Observable [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Future net cash flows
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows
Future income taxes
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Income Tax Expense
Discount at 10% per annum
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Ten Percent Annual Discount for Estimated Timing of Cash Flows
Future net cash flows before income taxes
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Cash Inflows
Development costs
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs
Sales of used trucks and equipment
Property sales (gains) other
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Net realized (gains) losses
Gain (Loss) on Sale of Derivatives
Oil and natural gas property sale (gain)
Oil and natural gas property sale gain
Property sales (gains) oil and natural gas
Gain (Loss) on Disposition of Oil and Gas Property
Gain on property sale
Sale of used trucks and equipment [Abstract]
General and administrative
General and administrative expenses
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations [Line Items]
Guarantees [Abstract]
Guarantees
Guarantees [Text Block]
Hedging Designation [Axis]
Hedging Designation [Domain]
Sales of Long-lived Assets
Impairment valuation loss
Impairment of oil and natural gas properties
Oil and natural gas property impairments
Income Taxes [Abstract]
Earnings (loss) from continuing operations
Earnings (Loss) from Continuing Operations
Income Statement Location [Axis]
From continuing operations (in dollars per share)
Earnings (Loss) from Continuing Operations, Per Share (in dollars per share)
Equity investment (earnings) losses
Pre-tax losses from equity method investment
Earnings (loss) before income taxes and equity investments
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income Statement Location [Domain]
Income Tax Authority [Axis]
From discontinued operations (in dollars per share)
Income Tax Authority [Domain]
Income Tax Examination [Table]
Income Taxes
Income Tax Disclosure [Text Block]
Income tax (provision) benefit
From continuing operations
Income Tax Expense (Benefit)
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Income Tax Examination [Line Items]
Statutory federal income tax (provision) benefit
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Reconciliation of taxes computed at the corporate federal income tax rate to the reported income tax (provision) [Abstract]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory depletion
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount
From equity investments
Tax benefit from equity investment
Other
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount
Earnings (loss) from discontinued operations net of tax (provision) benefit of zero, zero and $(163) respectively
Income tax receivable
Income Taxes
State income tax (provision) benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Federal and state tax paid
Income Taxes Paid
Increase (decrease) in accounts payable
Decrease (increase) in accounts receivable
Increase (Decrease) in Accounts Receivable
Increase (decrease) in accrued and other liabilities
Decrease (increase) in inventories
Increase (Decrease) in Inventories
Insurance and state collateral (deposits) refunds
Increase (Decrease) in Deposit Assets
Decrease (increase) in income tax receivable
Increase (Decrease) in Income Taxes Receivable
Decrease (increase) in prepayments
Increase (Decrease) in Prepaid Expense
Proved developed and undeveloped oil and gas reserves [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Interest expense
Interest Expense
Interest paid
Federal [Member]
Inventory
Inventory, Policy [Policy Text Block]
Inventory liquidation and valuation (gain) losses
Inventory Adjustments
Interest income
Interest income
Investments [Abstract]
Standby letters of credit
Letters of credit, Total
Letters of Credit Outstanding, Amount
Rental expense
Operating Leases, Rent Expense
Onshore Leasehold [Member]
Leaseholds and Leasehold Improvements [Member]
Letters of Credit [Member]
Total liabilities
Liabilities
Liabilities and shareholders' equity
Liabilities and Equity
LIABILITIES AND SHAREHOLDERS' EQUITY
OTHER LIABILITIES:
Total current liabilities
Liabilities, Current
CURRENT LIABILITIES:
Line of Credit Facility [Table]
Line of Credit Facility [Abstract]
Lender Name [Axis]
Letter of Credit Facility [Line Items]
Line of Credit Facility, Lender [Domain]
Line of credit facility, maximum borrowing capacity
Maximum borrowing amount
LONG-TERM DEBT
Letters of credit, 2019
Letters of credit, Thereafter
Long-term Debt, Maturities, Repayments of Principal after Year Five
Letters of credit, 2018
Letters of credit, 2020
Investments
Letters of credit, 2017
Loss Contingencies [Table]
Accrued future legal costs
Loss Contingency Accrual, Provision
Loss Contingencies [Line Items]
Total number of lawsuits
Loss Contingency, New Claims Filed, Number
Materials and supplies
Maximum [Member]
Minimum [Member]
Natural Gas [Member]
Natural Gas [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
FINANCING ACTIVITIES:
Net cash (used in) investing activities
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
CASH PROVIDED BY OPERATIONS:
Net cash (used in) financing activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
INVESTING ACTIVITIES:
Net earnings (loss)
Net earnings (loss)
Net Earnings (Loss), Amount
Net change in prices and production costs
Net Increase (Decrease) in Sales and Transfer Prices and Production Costs
Recent Accounting Pronouncements
Other Income (Expense):
Not Designated as Hedging Instrument [Member]
Net book value at December 31
Net book value at January 1
Oil and Gas Property, Successful Effort Method, Net
Oil and natural gas
Oil and Gas Producing Activities (Unaudited) [Abstract]
Assumed market prices of oil and natural gas reserves and future net revenues
Volume committed per day under commodity purchase and sale contract (in barrels)
Oil and Gas Delivery Commitments and Contracts, Daily Production
Oil and natural gas operations
Producing Oil and Gas Properties [Member]
Oil and Gas Properties [Member]
Oil and Gas Producing Activities (Unaudited)
Oil and Gas Exploration and Production Industries Disclosures [Text Block]
Oil [Member]
Oil and gas (successful efforts method)
Earliest Open Tax Year
Total
Operating Leases, Future Minimum Payments Due
Rental Expenses [Abstract]
2018
Commitments under long-term non-cancelable operating leases [Abstract]
Reportable Segments [Member]
Operating Segments [Member]
2017
Thereafter
2019
Operating (Loss) Earnings
Operating Income (Loss)
2020
2021
Other changes, net
Other Assets [Member]
Other Liabilities [Member]
Guarantor Obligation [Member]
Payment Guarantee [Member]
Investments
Payments for (Proceeds from) Investments
Cash payment for acquisition
Payments to Acquire Businesses, Gross
Dividend payments
Dividends
Payments of Dividends
Property and equipment additions
Payments to Acquire Property, Plant, and Equipment
Employee Benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Preferred stock - shares authorized (in shares)
Preferred stock - par value (in dollars per share)
Preferred stock - outstanding (in shares)
Preferred stock, $1.00 par value, 960,000 shares authorized, none outstanding
Insurance premiums
Components of Prepayments [Abstract]
Prepayments, total
Prepayments
Prepaid Expense, Current
Principal sources of changes in the standardized measure of discounted future net flows [Abstract]
Principal Sources of Change in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Abstract]
State tax refund
Proceeds from property sales
Proceeds from Sale of Property, Plant, and Equipment
Cash proceeds for sale
Product Concentration Risk [Member]
Production Type [Domain]
Other
Property and equipment, useful life
Property, Plant and Equipment, Useful Life
Property, Plant and Equipment, Type [Domain]
PROPERTY AND EQUIPMENT:
Property, Plant and Equipment, Net [Abstract]
Property and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Property and Equipment [Abstract]
Property and equipment additions
Net property and equipment
Property, Plant and Equipment, Net
Property, Plant and Equipment [Line Items]
Property and equipment
Property, Plant and Equipment, Gross
Property, Plant and Equipment by Type [Axis]
Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table]
Extensions, discoveries and other reserve additions
Production
Proved Developed and Undeveloped Reserves, Production
Proved developed reserves
Oil and gas reserves sold
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place
Total proved reserves
End of year
Beginning of year
Proved Developed and Undeveloped Reserves, Net
Proved undeveloped reserves
Revisions of previous estimates
Provision for doubtful accounts
Commodity purchases, Total
Purchase Obligation
Commodity purchases, 2017
Commodity purchases, 2020
Commodity purchases, 2019
Commodity purchases, 2018
Commodity purchases, Thereafter
Purchase Obligation, Due after Fifth Year
Commodity Put Option [Member]
Quarterly Financial Data (Unaudited)
Quarterly Financial Information [Text Block]
Quarterly Financial Data (Unaudited) [Abstract]
Range [Axis]
Range [Domain]
Allowance for Doubtful Accounts
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]
Identifiable assets by industry segment
Segment Operating Earnings [Abstract]
Reconciliation of segment earnings to earnings before income taxes
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Marketing
Refining and Marketing Revenue
Marketing
Refining and Marketing Costs
Affiliate billings to company
Transactions with Affiliates
Related Party Transactions Disclosure [Text Block]
Related Party [Domain]
Related Party Transaction [Line Items]
Related Party [Axis]
Transactions with Affiliates [Abstract]
Counterparty Name [Domain]
Reserve Quantities [Line Items]
Petroleum Reserves [Axis]
Dry hole costs incurred
Operating income (loss) before income taxes
Results of Operations, Income before Income Taxes
Income tax benefit
Results of Operations, Income Tax Expense
Production
Results of Operations, Production or Lifting Costs
Exploration
Results of Operations, Exploration Expense
Producing property impairment
Results of Operations, Impairment of Oil and Gas Properties
Depreciation, depletion and amortization
Results of Operations, Depreciation, Depletion and Amortization, and Valuation Provisions
Results of operations for oil and gas producing activities
Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block]
Revenues
Results of Operations, Revenue from Oil and Gas Producing Activities
Operating income (loss)
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs)
Results of operations for oil and gas producing activities [Abstract]
Costs and expenses [Abstract]
Results of Operations, Expense from Oil and Gas Producing Activities [Abstract]
Retained Earnings [Member]
Retained earnings
Revenue Recognition [Abstract]
Revenue Recognition
Company billings to affiliate
Total revenues
Revenues
REVENUES:
Net change due to revisions in quantity estimates
Concentration of Credit Risk [Abstract]
Revenues - Marketing [Member]
Sales [Member]
Sales of oil and gas produced, net of production costs
Sales and Transfers of Oil and Gas Produced, Net of Production Costs
Revenue [Member]
Scenario, Unspecified [Domain]
Components of the company's income tax (provision) benefit
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Components of the federal deferred tax asset (liability)
Company's asset retirement obligations
Schedule of Asset Retirement Obligations [Table Text Block]
Schedule of activities with affiliates
Schedule of Related Party Transactions [Table Text Block]
401K Plan contributory expenses
Fair value assets and liabilities
Principal sources of changes in the standardized measure of discounted future net flows
Selected quarterly financial data and earnings per share
Rental expense
Reconciliation of taxes computed at the corporate federal income tax rate to the reported income tax (provision)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Business Acquisitions, by Acquisition [Table]
Capitalized cost activity on the other acreage areas
Schedule of customers providing more than 10 percent of revenues
Parental guaranteed obligations
Schedule of Guarantor Obligations [Table]
Proved developed and undeveloped oil and gas reserves
Property, Plant and Equipment [Table]
Stand-by letters of credit issued
Schedule of Line of Credit Facilities [Table Text Block]
Information concerning business activities and assets by segment
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Derivatives reflected in the consolidated balance sheet
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives reflected in the consolidated statement of operations
Derivative Instruments, Gain (Loss) [Table Text Block]
Segment Reporting
Segment Reporting Disclosure [Text Block]
Segment [Domain]
Segment Reporting [Abstract]
Segment Reporting Information [Line Items]
Selected quarterly financial data and earnings per share [Abstract]
Selected Quarterly Financial Information [Abstract]
Share-Based Payments
Transportation
Shipping, Handling and Transportation Costs
Leasehold additions
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Standardized measure of discounted future net cash flows
Production rate changes and other
Standardized measure of discounted future net cash flows
End of year
Beginning of year
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves
Accretion of discount
Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves, Accretion of Discount
Statement [Line Items]
Equity Components [Axis]
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY [Abstract]
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Statement [Table]
Statement [Table]
CONSOLIDATED BALANCE SHEETS [Abstract]
Scenario [Axis]
Statements [Axis]
SHAREHOLDERS' EQUITY:
BALANCE
BALANCE
Total shareholders' equity
Stockholders' Equity Attributable to Parent
Subsequent Event [Abstract]
Subsequent Event [Member]
Subsequent Event
Subsequent Event Type [Axis]
Subsequent Event [Line Items]
Subsequent Event [Table]
Subsequent Event Type [Domain]
Statement of Cash Flows [Abstract]
Type of Reserve [Domain]
Net change in fair value contracts
Unrealized Gain (Loss) on Derivatives and Commodity Contracts
Net unrealized gains (losses)
Use of Estimates
Weighted average number of shares outstanding (in shares)
Louisiana [Member]
Michigan [Member]
Texas [Member]
Period of time over which the subsidiary may borrow a specified amount under a credit agreement with the entity.
December 5, 2016 to October 31, 2018 [Member]
December 5, 2016 to October 31, 2018 [Member]
A company that provides medical software services and technologies to medical providers and patients.
VestaCare, Inc. [Member]
A subsidiary of the entity. Bencap provides medical insurance brokerage an medical claims auditing services to employers utilizing ERISA governed employee benefit plans.
Bencap LLC [Member]
Refers to the amount of additional fund request.
Additional Funding Request
Additional funding request
Carrying value as of the balance sheet date of obligations incurred through that date and payable related to accrued medical claims.
Accrued medical claims
The total number of claims alleging oil and gas production subsidence contributing to the formation of a sink hole.
Number of claim alleging oil and gas production
Number of claims alleging subsidence caused by oil and gas production
Medical Accrual [Abstract]
This line item represents the amount of aggregate medical claims for umbrella insurance coverage.
Aggregate Medical Claims For Umbrella Insurance Coverage
Aggregate medical claims for umbrella insurance coverage per calendar year
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees for next twelve months.
Guaranteed Obligations Next Twelve Months
Guaranteed obligations, 2017
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees in four years.
Guaranteed Obligations In Four Years
Guaranteed obligations, 2020
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.
Guaranteed Obligations
Guaranteed obligations, Total
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees thereafter.
Guaranteed Obligations Thereafter
Guaranteed obligations Thereafter
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees in three years.
Guaranteed Obligations In Three Years
Guaranteed obligations, 2019
The carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees in two years.
Guaranteed Obligations in Two Years
Guaranteed obligations, 2018
Document and Entity Information [Abstract]
Amount of the current period expense charged against continuing operations and discontinued operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).
Provision for Bad Debts
Provisions for bad debts
The days of the month following a transaction during which payment for accounts receivable is required to occur, as per industry practice.
Industry practice payment of receivables
Represents customer two.
Customer Two [Member]
Represents customer three.
Customer Three [Member]
Represents customer one.
Customer One [Member]
Represents customer four.
Customer Four [Member]
The percentage of U.S. domestic refiner demand supplied by the Company.
Percentage of US demand supplied by company
Percentage of U.S. demand supplied by company
The number of large crude oil refining concerns from which the disclosed concentration of revenues is derived.
Number of customers
An identifiable operating segment of the entity.
Oil and Gas [Member]
An identifiable operating segment of the entity.
Marketing [Member]
An identifiable operating segment of the entity.
Transportation [Member]
Identifiable Assets By Segment [Abstract]
Operating earnings excluding general and administrative.
Segment Operating Earnings
Segment operating earnings (loss)
Segment operating earnings
Activities by Segment [Abstract]
Activities by Segment [Abstract]
Cash payments to a related party for use of assets under operating leases.
Related Party Transaction Payments for Rent from Transactions with Related Party
Rentals paid to affiliate
Recovery of expenses recognized resulting from transaction costs (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.
Recovery of Cost of Services, Overhead from Related Parties
Overhead recoveries
Amount paid to managing member or general partner, affiliate of managing member or general partner, or affiliate of limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but not limited to, salaries, rent, or overhead costs through transactions with a related party.
Related Party Transaction, Payment for Administrative Fees from Transactions with Related Party
Fees paid to Bencap
Tabular disclosure of the expense and loss contingencies that were incurred but no reported in the period or disclosed as of the balance sheet date.
Schedule of Expense and Loss Contingencies [Table Text Block]
Schedule of expenses and losses incurred but not reported
Tabular disclosure of medical accrual amounts of the entities self-insurance program.
Schedule of Medical Accrual Amounts [Table Text Block]
Schedule of accrued medical claims
Tabular disclosure of proved developed and proved undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period.
Schedule of Proved Oil and Gas Reserves [Table Text Block]
Components of proved oil and gas reserves
Tabular disclosure of the effect of income taxes and discounting on the standardized measure of discounted future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed.
Schedule of Effect of Income Taxes and Discounting on the Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Reserves Disclosure [Table Text Block]
Effect of income taxes and discounting on the standardized measure of discounted future net cash flows
Tabular disclosure of valuation allowance for receivables due a company that are expected to be uncollectible.
Schedule of Allowance for Doubtful Accounts Receivable [Table Text Block]
Changes in the allowance for doubtful accounts
Market Price [Abstract]
These amounts are the total of discounted future development and production costs before future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.
Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Before Future Income Tax Expense
Discounted future net cash flows before income taxes
Exploration costs incurred, including capitalized costs in oil and gas activities.
Costs Incurred Exploration Costs Capitalized
Capitalized
Proved Reserves [Abstract]
Total proved reserves [Abstract]
The amount of sales or transfers of oil gas that was previously included in proved oil and gas reserves.
Sale of Oil and Gas Reserves in the Standardized Measure of Discounted Future Net Flows
Sale of oil and gas reserves
The standardized measure of discounted future net flows of change in income taxes.
Standardized Measure of Discounted Future Net Flows Net Change in Income Taxes
Net change in income taxes
Proved oil and gas reserves [Abstract]
Components of proved oil and gas reserves [Abstract]
This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows before income tax relating to proved oil and gas reserves.
Discounted Future Net Cash Flows Before Income Tax Relating To Proved Oil And Gas Reserves 10 Percent Annual Discount For Estimated Timing Of Cash Flows
Discount at 10% per annum
Costs Incurred Exploration of Oil and Gas Properties [Abstract]
Exploration costs [Abstract]
This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future income tax relating to proved oil and gas reserves.
Discounted Future Income Tax Relating To Proved Oil And Gas Reserves 10 Percent Annual Discount For Estimated Timing Of Cash Flows
Future income taxes, net of discount at 10% per annum
These amounts are the total of future development and production costs before future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.
Future Net Cash Flows Relating To Proved Oil And Gas Reserves Before Future Income Tax Expense
Future gross revenues
The future cost of lease operating expenses of oil and gas from proved reserves located in this geographic region.
Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Lease Operating Expenses
Lease operating expenses
Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Costs [Abstract]
Future costs [Abstract]
Costs Incurred In Oil And Gas Exploration And Development Activities [Abstract]
Cost incurred in oil and gas exploration and development activities [Abstract]
Effect of income taxes and discounting on the standardized measure of discounted future net cash flows [Abstract]
Effect of income taxes and discounting on the standardized measure of discounted future net cash flows [Abstract]
Proved reserves are estimated using the average period of oil and gas prices.
Period of Average Estimated Price of Proved Reserves
Period of average estimated price of proved reserves
Gross amount, as of the balance sheet date, of long-lived depreciable assets used in the transportation of liquid chemicals on a "for hire" basis.
Transportation Property And Equipment
Transportation
Gross amount, as of the balance sheet date, of long-lived depreciable assets used in the storage and distributions of crude oil and refined petroleum products.
Marketing Property And Equipment
Marketing
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations and equity method investment.
Deferred Income Tax Expense (Benefit), Including Tax Expense (Benefit) from Equity Method Investment
Deferred income taxes (includes equity investments)
Tabular disclosure of aggregate capitalized costs relating to property plant and equipment that were not included in amounts reported for cash additions in the Statements of Cash Flows.
Capitalized Costs Relating to Property Plant and Equipment Not Included in Statement of Cash Flows [Table Text Block]
Capitalized costs included in property plant and equipment
Tabular disclosure of non-cash financing activities for the period.
Non-cash Financing Activities, Statement of Cash Flow [Table Text Block]
Non-cash financing activities
Tabular disclosure of the entity's accounting policy for the recognition of revenue under certain crude oil contracts.
Revenue Recognition, Crude Oil Contracts [Table Text Block]
Reporting revenue of crude oil contracts on a gross revenue basis
Tabular disclosure of realized gains and losses on the sale of equipment reported in the statement of income.
Summary of Pre-tax Gains on the Sale of Equipment [Table Text Block]
Pre-tax gain on the sale of equipment
Tabular disclosure of the fair value of impairment provisions included in oil and gas segment operation losses.
Fair Value, Impairment Provision, Oil and Gas Segment Operations [Table Text Block]
Fair value of impairment provisions
Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas non producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances.
Capitalized Costs Relating to Oil and Gas Non Producing Activities [Table Text Block]
Fair value measurements for producing oil and gas properties that were subject to fair value impairment
Tabular disclosure of the carrying amounts of cash deposits and other assets. This disclosure includes other current assets and other noncurrent assets.
Schedule of Cash Deposits and Other Assets [Table Text Block]
Components of cash deposits and other assets
Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas non producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances.
Capitalized costs for non producing oil and gas leasehold interests [Table Text Block]
Capitalized costs for non-producing oil and gas leasehold interests
Tabular disclosure of factors impacting assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
Schedule Of Factors Impacting the Fair Value Assets And Liabilities Measured On Recurring Basis [Table Text Block]
Factors impacting the change in the net value of the company's fair value contracts
Tabular disclosure of the carrying amounts of components of prepayments and other assets.
Components of prepayments and other [Table Text Block]
Components of prepayments and other
Earliest Tax Years Remaining for Federal and Major States of Operations [Abstract]
Earliest tax years remaining for Federal and major states of operations [Abstract]
The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable income or loss from continuing operations and discontinued operations.
Current Federal Tax Expense (Benefit), Continuing and Discontinued Operations
Federal
The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable income or loss from continuing operations and discontinued operations.
Current State and Local Tax Expense (Benefit), Continuing and Discontinued Operations
State
The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable income or loss from continuing operations and discontinued operations.
Current Income Tax Expense (Benefit), Continuing and Discontinued Operations
Current income tax (provision) benefit
Current Income Tax Expense (Benefit), Continuing and Discontinued Operations [Abstract]
Current [Abstract]
Deferred Income Tax Expense (Benefit), Continuing and Discontinued Operations [Abstract]
Deferred [Abstract]
Noncurrent amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.
Deferred Tax Liabilities, Prepaid Expenses, Noncurrent
Prepaid and other insurance
Deferred Tax Liabilities Noncurrent [Abstract]
Long-term deferred tax asset (liability) [Abstract]
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and discontinued operations.
Income tax expense benefit continuing and discontinued operations
Income tax (provision) benefit
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences uniform capitalization.
Deferred Tax Asset Uniform Capitalization
Uniform capitalization
Income Tax Expense (Benefit), Continuing And Discontinued Operations [Abstract]
Income tax (provision) benefit, continuing and discontinued operations [Abstract]
Tabular disclosure of earliest tax years remaining for Federal and major states of operations.
Schedule of Earliest Tax Years Remaining for Federal and Major States of Operations [Table Text Block]
Earliest tax years remaining for federal and major states of operations
Tabular disclosure of income tax (benefit) expense allocated between continuing operations and discontinued operations.
Schedule of Income Tax Expense Benefit Allocation [Table Text Block]
Income tax (provision) benefit allocable to continuing and discontinued operations
Factors Impacting the Change in the Net Value of the Entity's Fair Value Contracts [Abstract]
Factors impacting the change in the net value of the Company's fair value contracts [Abstract]
Assets or liabilities, including financial instruments classified in shareholders' equity, measured at fair value and categorized as counterparty offsets.
Counterparty offsets [Member]
Counterparty Offsets [Member]
Disclosure of accounting policy related to prepayments.
Prepayments [Policy Text Block]
Prepayments
Disclosure of accounting policy for cash deposits and other assets.
Cash Deposits and Other Assets [Policy Text Block]
Cash Deposits and Other Assets
Disclosure of accounting policy for the statement of cash flows of consolidated entities.
Statement of Cash Flows [Policy Text Block]
Statement of Cash Flows
Disclosure of accounting policy for the nature of an entity's business.
Nature of Operations [Policy Text Block]
Nature of Operations
Disclosure of accounting policy for the total amount of the contingent obligation under letters of credit outstanding as of the balance sheet.
Letter of Credit Facility, Policy [Policy Text Block]
Letter of Credit Facility
Duration period applicable to the existing contract from January 2017 to April 2017.
Jan2017 To April2017 [Member]
Jan 2017 through April 2017 [Member]
Duration period applicable to the existing contract from January 2017 to March 2017.
Jan2017 To Mar2017 [Member]
Jan 2017 through Mar 2017 [Member]
Duration period applicable to the existing contract
March 2016 [Member]
Duration period applicable to the existing contract.
February 2016 [Member]
Assets used to produce oil or gas that were impaired in 2015.
Producing Oil And Gas Properties Impaired In2015 [Member]
Producing Oil And Gas Properties Impaired in 2015 [Member]
Number of days from the transaction date, cash is received from the debtor.
Number of Days Cash is Received from Transaction Date
Number of days, cash is received from transaction date
Non-producing oil and gas properties.
Non Producing Oil and Gas Properties [Member]
Non-Producing Oil and Gas Properties [Member]
Represents categorization of total capitalized costs for non-producing oil and gas leasehold interests.
South Texas Project acreage [Member]
Represents categorization of total capitalized costs for non-producing oil and gas leasehold interests.
Napoleonville, Louisiana acreage [Member]
Napoleonville Louisiana acreage [Member]
Represents categorization of total capitalized costs for non-producing oil and gas leasehold interests.
Wyoming and Other Acreage Areas [Member]
Wyoming and other acreage [Member]
Assets used to produce oil or gas that were impaired in 2016.
Producing Oil And Gas Properties Impaired In2016 [Member]
Producing Oil And Gas Properties Impaired in 2016 [Member]
Percentage of crude oil and natural gas sales in accounts receivable.
Percentage of Crude Oil and Natural Gas Sales in Accounts Receivable
Percentage of crude oil and natural gas sales in accounts receivable
A Credit and Security Agreement with Wells Fargo Bank that is maintained by the Company.
Wells Fargo Bank [Member]
A liquidity ratio that measures a company's ability to pay short-term obligations.
Current ratio
Duration period applicable to the existing contract.
January 2016 [Member]
The amount of cash collateral deposits for commodity purchases, as of the balance sheet date.
Cash collateral deposits for commodity purchases
Amount of asset related to consideration paid in advance for rent and other costs that provides economic benefits within a future period of one year or the normal operating cycle, if longer.
Prepaid Rent and Other
Rents, license and other
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Current Assets [Member]
Capitalized costs of in-process wells suspended incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.
Capitalized Costs, In-Process Wells Suspended
In-process wells suspended
Amount of cash deposits and noncurrent assets classified as other.
Cash Deposits and Other Assets, Noncurrent
Cash deposits and other
Cash deposits and other
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Current Liabilities [Member]
This line item represents the capitalized costs for non-producing oil and gas leasehold interests specified as a percentage of total oil and gas property costs.
Capitalized costs for non producing oil and gas leasehold interests specified as percentage of total costs
Capitalized costs for non-producing oil and gas leasehold interests specified as percentage of total costs
Net amount of capitalized costs relating to oil and gas non producing activities.
Capitalized Costs Oil And Gas Non Producing Activities Net
Total Non-producing Leasehold Costs
The net book value of the oil and gas properties sold.
Net Book Value, Sale of Oil and Gas Properties
Property sales
Capitalized Costs Oil And Gas Producing and Non Producing Activities Net [Abstract]
Fair value measurements for producing and non-producing oil and gas properties that were subject to fair value impairment [Abstract]
Deposits established for the remittance of state crude oil severance taxes and other state collateral deposits.
State collateral deposits
Cash Deposits and Other Assets [Abstract]
Increase in the entity's reported revenue.
Increase in Entity Reporting Revenue
Revenue gross-up
The amount of net income (loss) from equity investments per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.
Income Loss From Equity Investments Per Basic And Diluted Share
From equity investments (in dollars per share)
This item represents the entity's proportionate share for the period of the net income (loss), net of tax, of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
Income (Loss) from Equity Method Investments, Net of Tax
Earnings (loss) from equity investments, net of tax benefit of $770, zero and zero, respectively
Recognized net loss from investment
Revenue from the transport of liquid chemicals on a for hire basis.
Liquid chemical transportation revenue
Transportation
Income Tax Expense Benefits [Abstract]
Income Tax (Provision) Benefit: