Statement of Financial Position [Abstract]
ASSETS
Assets [Abstract]
Current assets
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted cash
Restricted Cash, Current
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current
Income taxes receivable
Income Taxes Receivable, Current
Inventories
Inventory, Net
Derivative instruments
Derivative Asset, Current
Other current assets
Other Assets, Current
Total current assets
Assets, Current
Properties and equipment, net (Successful efforts method)
Property, Plant and Equipment, Net
Other assets
Other Assets, Noncurrent
Total assets
Assets
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities and Equity [Abstract]
Current liabilities
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Current portion of long-term debt
Long-term Debt, Current Maturities
Accrued liabilities
Accrued Liabilities, Current
Interest payable
Interest Payable, Current
Total current liabilities
Liabilities, Current
Long-term debt, net
Long-term Debt, Excluding Current Maturities
Deferred income taxes
Deferred Income Tax Liabilities, Net
Asset retirement obligations
Asset Retirement Obligations, Noncurrent
Postretirement benefits
Liability, Defined Benefit Plan, Noncurrent
Other liabilities
Other Liabilities, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies
Commitments and Contingencies
Stockholders' equity
Stockholders' Equity Attributable to Parent [Abstract]
Common stock
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital, Common Stock
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Treasury stock
Treasury Stock, Value
Total stockholders' equity
Stockholders' Equity Attributable to Parent
Total liabilities and stockholders' equity
Liabilities and Equity
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Table]
Investment, Name [Axis]
Investment, Name [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
Constitution
Constitution Pipeline Company, LLC [Member]
Constitution Pipeline Company, LLC [Member]
Meade
Meade Pipeline Co LLC [Member]
Represents information pertaining to the Meade Pipeline Co LLC.
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments
Equity Method Investments [Roll Forward]
Equity Method Investments [Roll Forward]
Balance at beginning of period
Equity Method Investments
Contributions
Payments to Acquire Equity Method Investments
Distributions
Proceeds From Equity Method Investments, Distributions (Including Return Of Capital)
Proceeds From Equity Method Investments, Distributions (Including Return Of Capital)
Earnings (loss) on equity method investments
Income (Loss) from Equity Method Investments
Sale of investment
Proceeds from Sale of Equity Method Investments
Balance at end of period
Ownership percentage
Equity Method Investment, Ownership Percentage
Payment for sale of investment
Payment For Sale Of Equity Method Investment
Payment For Sale Of Equity Method Investment
Cover [Abstract]
Document Type
Document Type
Document Quarterly Report
Document Quarterly Report
Document Period End Date
Document Period End Date
Document Transition Report
Document Transition Report
Entity File Number
Entity File Number
Entity Registrant Name
Entity Registrant Name
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Entity Tax Identification Number
Entity Tax Identification Number
Entity Address, Address Line One
Entity Address, Address Line One
Entity Address, Address Line Two
Entity Address, Address Line Two
Entity Address, Address Line Three
Entity Address, Address Line Three
Entity Address, City or Town
Entity Address, City or Town
Entity Address, State or Province
Entity Address, State or Province
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
City Area Code
City Area Code
Local Phone Number
Local Phone Number
Title of 12(b) Security
Title of 12(b) Security
Trading Symbol
Trading Symbol
Security Exchange Name
Security Exchange Name
Entity Current Reporting Status
Entity Current Reporting Status
Entity Interactive Data Current
Entity Interactive Data Current
Entity Filer Category
Entity Filer Category
Entity Small Business
Entity Small Business
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Shell Company
Entity Shell Company
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash received (paid) on settlement of derivative instruments, gain (loss) on derivative instruments
Realized Gain (Loss) on Derivatives
The realized gain (loss) on derivative instruments from the difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.
Non-cash gain (loss) on derivative instruments, gain (loss) on derivative instruments
Unrealized Gain (Loss) on Derivatives
Gain (loss) on derivative instruments
Derivative, Gain (Loss) on Derivative, Net
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
TSR performance share awards
TSR Performance Shares [Member]
Represents the shares or units awarded to the employees based on the comparative performance of the reporting entity's common stock measured against fifteen to sixteen other entities in its peer group over a three year performance period.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Stock price volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Risk free rate of return
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Minimum expected volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Maximum expected volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Minimum risk free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Maximum risk free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum
Outstanding commodity derivatives
Schedule of Derivative Instruments [Table Text Block]
Effect of derivative instruments on the condensed consolidated balance sheet
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Schedule of offsetting of derivative liabilities in the condensed consolidated balance sheet
Offsetting Liabilities [Table Text Block]
Schedule of offsetting of derivative assets in the condensed consolidated balance sheet
Offsetting Assets [Table Text Block]
Effect of derivatives on the condensed consolidated statement of operations
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
Equity Method Investments
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent event
Subsequent Event [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
6.51% weighted-average senior notes
Six Point Five One Percentage Weighted Average Fixed Rate Notes [Member]
6.51% Weighted Average Fixed Rate Notes.
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving credit facility
Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Repaid debt
Extinguishment of Debt, Amount
Weighted average interest rate
Long-term Debt, Weighted Average Interest Rate, at Point in Time
Borrowing base
Line of Credit Facility, Maximum Borrowing Capacity
Remaining borrowing capacity
Line of Credit Facility, Remaining Borrowing Capacity
Long-term debt
Long-term Debt, Gross
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period
Asset Retirement Obligation
Liabilities incurred
Asset Retirement Obligation, Liabilities Incurred
Accretion expense
Asset Retirement Obligation, Accretion Expense
Balance at end of period
Less: current asset retirement obligations
Asset Retirement Obligation, Current
Noncurrent asset retirement obligations
Debt and credit agreement components
Schedule of Long-term Debt Instruments [Table Text Block]
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common stock
Common Stock [Member]
Treasury stock
Treasury Stock [Member]
Paid-In Capital
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent [Member]
Retained Earnings
Retained Earnings [Member]
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (shares)
Shares, Outstanding
Balance at beginning of period
Net income
Net Income (Loss) Attributable to Parent
Stock amortization and vesting (shares)
Stock Amortization and Vesting, Shares
This element represent number of shares of stock amortization and vesting of stock during reporting period.
Sale of stock held in rabbi trust
Stock Amortization and Vesting
This element represent value stock amortization and vesting of stock during reporting period.
Purchase of treasury stock (shares)
Stock Repurchased During Period, Shares
Purchase of treasury stock
Stock Repurchased During Period, Value
Cash dividends
Dividends, Common Stock, Cash
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Balance (shares)
Balance at end of period
Debt and Credit Agreements
Long-term Debt [Text Block]
Derivative [Table]
Derivative [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Derivative instruments (current)
Derivative Instruments Current [Member]
Derivative Instruments Current [Member]
Accrued liabilities (current)
Other Current Liabilities [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Derivatives not designated as hedges
Not Designated as Hedging Instrument [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity contracts
Commodity Contract [Member]
Effect of derivative instruments on the Consolidated Balance Sheet
Derivatives, Fair Value [Line Items]
Derivative Assets
Derivative Asset
Derivative Liabilities
Derivative Liability
Fair Value Disclosures [Abstract]
Financial assets and liabilities measured at fair value on a recurring basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Reconciliation of changes in the fair value of financial assets and liabilities classified as level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Carrying amounts and fair values of debt
Fair Value, by Balance Sheet Grouping [Table Text Block]
Asset Retirement Obligations
Asset Retirement Obligation Disclosure [Text Block]
Number of non-financial assets and liabilities impaired
Number of Non Financial Assets and Liabilities Impaired
Represents the number of non-financial assets and liabilities that were impaired during the period.
Income Statement [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Natural gas
Natural Gas, Production [Member]
Other
Other Revenues [Member]
Other Revenues [Member]
OPERATING REVENUES
Revenues [Abstract]
Operating revenues
Revenue from Contract with Customer, Excluding Assessed Tax
Gain on derivative instruments
Derivative Revenue, Cash Settlements And Change In Fair Value
Derivative Revenue, Cash Settlements And Change In Fair Value
Total operating revenues
Revenues
OPERATING EXPENSES
Operating Expenses [Abstract]
Direct operations
Direct Operating Costs
Transportation and gathering
Results of Operations, Transportation Costs
Taxes other than income
Taxes, Miscellaneous
Exploration
Exploration Expense
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization
General and administrative
General and Administrative Expense
Total operating expenses
Costs and Expenses
Earnings (loss) on equity method investments
Loss on sale of assets
Gain (Loss) on Disposition of Property Plant Equipment
INCOME FROM OPERATIONS
Operating Income (Loss)
Interest expense, net
Interest Income (Expense), Net
Other expense
Other Nonoperating Income (Expense)
Income tax expense
Income Tax Expense (Benefit)
NET INCOME
Earnings per share
Earnings Per Share [Abstract]
Basic (in dollars per share)
Earnings Per Share, Basic
Diluted (in dollars per share)
Earnings Per Share, Diluted
Weighted-average common shares outstanding
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Stock-Based Compensation
Share-based Payment Arrangement [Text Block]
Restricted stock units
Restricted Stock Units (RSUs) [Member]
Performance share awards
Performance Shares [Member]
Performance share awards based on internal performance metrics
Internal Metrics Performance Share Awards [Member]
The portion of performance share-based compensation awards that have payouts based on performance against internal performance metrics established by the entity.
Employee performance share awards
Employee Performance Shares [Member]
Represents the shares or units awarded to the employees for meeting certain performance targets.
Hybrid performance share awards
Hybrid Performance Shares [Member]
Represents the shares or units awarded to the employees for meeting certain performance targets, if the entity does not meet the performance metric for the applicable period, then the portion of the performance shares that would have been issued on that anniversary date will be forfeited.
Performance shares based on market conditions
Market Based Performance Share Awards [Member]
The portion of performance share-based compensation awards that have payouts based on market conditions established by the entity.
Vesting [Axis]
Vesting [Axis]
Vesting [Domain]
Vesting [Domain]
Hybrid performance share awards, percentage vesting on the first anniversary
Share-based Compensation Award, Share Awards Percentage Vesting on the First Service Anniversary [Member]
Share-based Compensation Award, Share Awards Percentage Vesting on the First Service Anniversary [Member]
Hybrid performance share awards, percentage vesting on the second anniversary
Share-based Compensation Award, Share Awards Percentage Vesting on the Second Service Anniversary [Member]
Share-based Compensation Award, Share Awards Percentage Vesting on the Second Service Anniversary [Member]
Hybrid performance share awards, percentage vesting on the third anniversary
Share-based Compensation Award, Share Awards Percentage Vesting on the Third Service Anniversary [Member]
Share-based Compensation Award, Share Awards Percentage Vesting on the Third Service Anniversary [Member]
Stock-based Compensation arrangements
Stock based compensation expense
Share-based Payment Arrangement, Expense
Granted (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Annual forfeiture rate assumption (as a percent)
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Expected Forfeitures
The rate of forfeitures assumptions that is used in calculating the fair values of a share-based compensation award.
Right to receive additional shares, maximum
Share Based Compensation Arrangement by Share Based Compensation Award Percentage Right to Receive Additional Shares
Represents the right of an employee to receive additional shares of common stock expressed as a percentage of award granted on satisfaction of either a service condition, market condition or a performance condition under an equity-based compensation plan.
Award vesting rights (as a percent)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
Minimum operating cash flow for the year preceding the performance period
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Minimum Operating Cash Flow Requirement
Represents the minimum operating cash flow which the entity must achieve in the one-year period preceding the vesting date of share-based compensation awards with payout based on performance.
Right to receive shares
Share Based Compensation Arrangement by Share Based Compensation Award, Percentage Right to Receive Shares
Represents the right to receive shares under share-based compensation arrangement, expressed as a percentage.
Right to receive an additional award in cash
Share Based Compensation Arrangement By Share Based Compensation Award Percentage Right To Receive Cash
Represents the right to receive cash under share-based compensation arrangement, expressed as a percentage
Number of years over which performance criteria is to be met
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Performance period
Share Based Compensation Arrangement by Share Based Payment Award Performance Period
Represents the performance period for awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
Balance Sheet Related Disclosures [Abstract]
Additional balance sheet information
Additional Balance Sheet Information [Table Text Block]
Tabular disclosure of supplemental balance sheet disclosures for assets and liabilities.
Basis of Accounting
Basis of Accounting, Policy [Policy Text Block]
Reclassifications
Reclassification, Comparability Adjustment [Policy Text Block]
Recently Adopted Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Asset retirement obligations
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Revenue from Contract with Customer [Abstract]
Unsatisfied performance obligations
Revenue, Remaining Performance Obligation, Amount
Contracts with customers
Contract with Customer, Asset, after Allowance for Credit Loss
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations, expected period of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Revenue Recognition
Revenue from Contract with Customer [Text Block]
Earnings per Common Share
Earnings Per Share [Text Block]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at fair value measurement
Portion at Fair Value Measurement [Member]
Carrying Amount
Reported Value Measurement [Member]
Estimated Fair Value
Estimate of Fair Value Measurement [Member]
Fair value disclosures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt
Long-term Debt
Current maturities
Long-term debt, excluding current maturities
Statement of Cash Flows [Abstract]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to cash provided by operating activities:
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, depletion and amortization
Deferred income tax expense
Deferred Income Tax Expense (Benefit)
Loss on sale of assets
Exploratory dry hole cost
Results of Operations, Dry Hole Costs
Gain on derivative instruments
Net cash received in settlement of derivative instruments
Proceeds from (Payments for) Derivative Instrument, Operating Activities
Proceeds from (Payments for) Derivative Instrument, Operating Activities
Loss (earnings) on equity method investments
Distribution of earnings from equity method investments
Proceeds from Equity Method Investment, Distribution
Amortization of debt issuance costs
Amortization of Debt Issuance Costs
Stock-based compensation and other
Stock Based Compensation Expense and Other
The aggregate amount of noncash, equity-based employee remuneration and non-cash share-based compensation expense. This may include the value of stock options, amortization of restricted stock, and adjustments for officers compensation, as well as other non-cash expenses. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable, net
Increase (Decrease) in Receivables
Income taxes
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable
Inventories
Increase (Decrease) in Inventories
Other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable and accrued liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Interest payable
Increase (Decrease) in Interest Payable, Net
Other assets and liabilities
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
CASH FLOWS FROM INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures
Payments to Explore and Develop Oil and Gas Properties
Proceeds from sale of assets
Proceeds from Sale of Property, Plant, and Equipment
Investment in equity method investments
Distribution of investment from equity method investments
Proceeds from Equity Method Investment, Distribution, Return of Capital
Proceeds from sale of equity method investments
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
CASH FLOWS FROM FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings from debt
Proceeds from Issuance of Long-term Debt
Repayments of debt
Repayments of Long-term Debt
Treasury stock repurchases
Payments for Repurchase of Equity
Dividends paid
Payments of Ordinary Dividends, Common Stock
Tax withholdings on vesting of stock awards
Payment, Tax Withholding, Share-based Payment Arrangement
Capitalized debt issuance costs
Payments of Debt Issuance Costs
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Net (decrease) increase in cash, cash equivalents and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Cash, cash equivalents and restricted cash, beginning of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash, cash equivalents and restricted cash, end of period
Summary of information related to the company's equity method investments
Equity Method Investments [Table Text Block]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Stock awards
Share-based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average stock awards excluded from diluted EPS due to the anti-dilutive effect calculated using the treasury stock method (shares)
Antidilutive Securities Excluded from Computation of EPS, Amount, Treasury Stock Method
Antidilutive Securities Excluded from Computation of EPS, Amount, Treasury Stock Method
Assumptions to Determine the Grant Date Fair Value of the Equity Component and the Period-End Fair Value of the Liability
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Inputs, Level 1 [Member]
Significant Other Observable Inputs (Level 2)
Fair Value, Inputs, Level 2 [Member]
Significant Unobservable Inputs (Level 3)
Fair Value, Inputs, Level 3 [Member]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Recurring basis
Fair Value, Recurring [Member]
Financial Assets and Liabilities Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan
Deferred Compensation Plan Assets
Derivative instruments
Total assets
Assets, Fair Value Disclosure
Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan
Deferred Compensation Liability, Classified, Noncurrent
Derivative instruments
Total liabilities
Financial and Nonfinancial Liabilities, Fair Value Disclosure
Cash dividends, per share (in dollars per share)
Common Stock, Dividends, Per Share, Declared
Common stock, authorized (shares)
Common Stock, Shares Authorized
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, issued (shares)
Common Stock, Shares, Issued
Treasury stock (shares)
Treasury Stock, Shares
Disaggregation of revenue
Disaggregation of Revenue [Table Text Block]
Accounts receivable, net
Accounts and Financing Receivable, after Allowance for Credit Loss [Abstract]
Trade accounts
Accounts Receivable, before Allowance for Credit Loss, Current
Other accounts
Other Receivables
Accounts receivable, gross
Receivables Gross Current
The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables.
Allowance for doubtful accounts
Accounts Receivable, Allowance for Credit Loss, Current
Accounts receivable, net
Other assets
Other Assets, Noncurrent [Abstract]
Deferred compensation plan
Debt issuance costs
Debt Issuance Cost, Gross, Noncurrent
Operating lease right-of-use assets
Operating Lease, Right-of-Use Asset
Other accounts
Other Assets, Miscellaneous, Noncurrent
Other assets
Accounts payable
Accounts Payable, Current [Abstract]
Trade accounts
Accounts Payable, Trade, Current
Royalty and other owners
Accrued Royalties, Current
Accrued transportation
Accrued Transportation Costs
Accrued Transportation Costs
Accrued capital costs
Accrued Capital Expenditures
Accrued Capital Expenditures
Taxes other than income
Accrual for Taxes Other than Income Taxes, Current
Other accounts
Accounts Payable, Other, Current
Accounts payable
Accrued liabilities
Accrued Liabilities, Current [Abstract]
Employee benefits
Accrued Employee Benefits, Current
Taxes other than income
Accrual for Ad Valorem and Other Non Income Taxes Current
Carrying value as of the balance sheet date of obligations incurred and payable for advalorem taxes, franchise and other non-income taxes. Reflects the current portion of the liability (payable within one year or the normal operating cycle if longer).
Operating lease liabilities
Operating Lease, Liability, Current
Other accounts
Other Accrued Liabilities, Current
Accrued liabilities
Other liabilities
Other Liabilities, Noncurrent [Abstract]
Deferred compensation plan
Operating lease liabilities
Operating Lease, Liability, Noncurrent
Other accounts
Other Sundry Liabilities, Noncurrent
Other liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]
Calculation of basic and diluted weighted-average shares outstanding
Schedule of Weighted Average Number of Shares [Table Text Block]
Calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
5.58% weighted-average senior notes
Five Point Five Eight Percentage Weighted Average Fixed Rate Notes [Member]
5.58% Weighted Average Fixed Rate Notes.
3.65% weighted-average senior notes
Three Point Sixty Five Percentage Weighted Average Fixed Rate Note [Member]
3.65% Weighted Average Fixed Rate Note
Total debt
Unamortized debt issuance costs
Debt Issuance Costs, Net
Additional Balance Sheet Information
Supplemental Balance Sheet Disclosures [Text Block]
Derivative Instruments
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Property, Plant and Equipment [Abstract]
Proved oil and gas properties
Proved Oil and Gas Property, Successful Effort Method
Unproved oil and gas properties
Unproved Oil and Gas Property, Successful Effort Method
Land, buildings and other equipment
Property, Plant and Equipment, Other, Gross
Properties and equipment, gross, total
Property, Plant and Equipment, Gross
Accumulated depreciation, depletion and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Properties and equipment, net
Schedule of properties and equipment, net
Property, Plant and Equipment [Table Text Block]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Total gain (loss) included in earnings
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
Settlement (gain) loss
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements
Transfers in and/or out of Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net
Balance at end of period
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)
Derivative, by Nature [Axis]
Derivative, Name [Domain]
Natural gas (NYMEX)
Natural Gas Contract, Contract One [Member]
Natural Gas Contract, Contract One [Member]
Natural gas (NYMEX)
Natural Gas, Contract Two [Member]
Natural Gas, Contract Two [Member]
Derivative [Line Items]
Derivative [Line Items]
Volume (in Mmbtu)
Derivative, Nonmonetary Notional Amount, Energy Measure
Floor, range (in usd per Mmbtu)
Derivative, Floor Price
Floor, weighted-average (in usd per Mmbtu)
Derivative, Average Floor Price
Ceiling, range (in usd per Mmbtu)
Derivative, Cap Price
Ceiling, weighted-average (in usd per Mmbtu)
Derivative, Average Cap Price
Swaps weighted-average (in usd per Mmbtu)
Derivative, Swap Type, Average Fixed Price
Weighted-average shares - basic (shares)
Dilution effect of stock awards at end of period (shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Weighted-average shares - diluted (shares)
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Natural gas
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers
Offsetting of Derivative Assets and Liabilities in the Condensed Consolidated Balance Sheet
Offsetting [Abstract]
Derivative assets
Derivative Asset [Abstract]
Gross amounts of recognized assets
Derivative Asset, Fair Value, Gross Asset
Gross amounts offset in the condensed consolidated balance sheet
Derivative Asset, Fair Value, Gross Liability
Net amounts of assets presented in the condensed consolidated balance sheet
Gross amounts of financial instruments not offset in the condensed consolidated balance sheet
Derivative Asset, Fair Value, Amount Offset Against Collateral
Net amount
Derivative liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities
Derivative Liability, Fair Value, Gross Liability
Gross amounts offset in the condensed consolidated balance sheet
Derivative Liability, Fair Value, Gross Asset
Net amounts of liabilities presented in the condensed consolidated balance sheet
Derivative Liability, Fair Value, Amount Not Offset Against Collateral
Gross amounts of financial instruments not offset in the condensed consolidated balance sheet
Derivative Liability, Not Subject to Master Netting Arrangement
Net amount
Properties and Equipment, Net
Property, Plant and Equipment Disclosure [Text Block]