Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Deferred Compensation [Member]
Deferred Compensation, Share-based Payments [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Statement [Line Items]
Statement [Line Items]
Common Stock, Dividends, Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances
Stockholders' Equity Attributable to Parent
Beginning Balances, shares
Shares, Issued
Net Income
Net Income (Loss) Attributable to Parent
Other comprehensive loss/income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Dividends
Dividends
Conversion of debentures
Stock Issued During Period, Value, Conversion of Convertible Securities
Conversion of debentures, shares
Stock Issued During Period, Shares, Conversion of Convertible Securities
Share-based compensation
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures
Share-based compensation, shares
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
Treasury Stock Activity During Period, Shares
Treasury Stock Activity During Period, Shares
Treasury Stock Activity During Period, Shares
Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value
Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value
Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value
Ending Balances
Ending Balances, shares
Disclosure of Compensation Related Costs, Share-based Payments [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]
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
Awards to non-employee directors [Member]
Awards to non-employee directors [Member]
Awards to non-employee directors [Member]
Award to key employees [Member]
Award to key employees [Member]
Award to key employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Outstanding - December 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Number of Shares, Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Number of Shares, Vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Number of Shares, Outstanding - March 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Fair Value, Outstanding - December 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Outstanding - March 31, 2014
Deferred compensation plan held Rabbi Trust (in shares)
Shares Held In Trust For Deferred Compensation Plan
Deferred compensation plan held Rabbi Trust.
Shares issued under the performance incentive plan withheld for employee taxes (in shares)
Shares Paid for Tax Withholding for Share Based Compensation
Cash Dividends Declared Per Share of Common Stock (in usd per share)
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
9.08% bond, due June 1, 2022 [Member]
First Mortgage Bond Due On Two Thousand Twenty Two [Member]
First mortgage bond due on 2022.
7.83% note, due January 1, 2015 [Member]
Uncollateralized Senior Note Due On Two Thousand Fifteen [Member]
Uncollateralized senior note due on 2015.
6.64% note, due October 31, 2017 [Member]
Uncollateralized Senior Note One Due On Two Thousand Seventeen [Member]
Uncollateralized senior note one due on 2017.
5.50% note, due October 12, 2020 [Member]
Uncollateralized Senior Note Due On Two Thousand Twenty [Member]
Uncollateralized Senior Note Due On Two Thousand Twenty [Member]
5.93% note, due October 31, 2023 [Member]
Uncollateralized Senior Note Due On Two Thousand Twenty Three [Member]
Uncollateralized senior note due on 2023.
5.68% note, due June 30, 2026 [Member]
Uncollateralized Senior Note Due On Two Thousand Twenty Six [Member]
Uncollateralized senior note due on 2026.
8.25% due March 1, 2014 [Member]
Convertible Debentures Due Two Thousand Fourteen [Member]
Convertible debentures due two thousand fourteen.
Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member]
Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member]
Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member]
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member]
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member]
Uncollateralized Senior Note Due on December Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Long-term debt, interest percentage
Debt Instrument, Interest Rate, Stated Percentage
Debt instrument, maturity date
Debt Instrument, Maturity Date
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Operating Revenues, Unaffiliated Customers [Member]
Operating Segments [Member]
Intersegment Revenues [Member]
Intersegment Eliminations [Member]
Business Segments [Axis]
Segments [Axis]
Segment [Domain]
Segments [Domain]
Regulated Energy [Member]
Regulated Energy [Member]
Regulated energy.
Unregulated Energy [Member]
Unregulated Energy [Member]
Unregulated energy.
Other [Member]
Other Segments [Member]
Other and eliminations [Member]
Other Segments And Intersegments Eliminations [Member]
Other segments and intersegments eliminations.
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Operating Revenues, Unaffiliated Customers
Operating Revenues Unaffiliated Customers [Abstract]
Total operating revenues unaffiliated customers.
Total operating revenues, unaffiliated customers
Revenues
Intersegment Revenues
Intersegment Revenues [Abstract]
Intersegment revenues.
Operating Income
Operating Income [Abstract]
Operating income.
Total operating income
Operating Income (Loss)
Other income, net of other expenses
Other Nonoperating Income (Expense)
Interest
Interest Expense
Income Before Income Taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Income taxes
Income Tax Expense (Benefit)
Net Income
Identifiable Assets
Assets [Abstract]
Total identifiable assets
Assets
Regulated Operations [Abstract]
Rates and Other Regulatory Activities [Table]
Investment In Affiliates [Table]
Investment In Affiliates [Table]
Project Name [Axis]
Project [Axis]
Project with Exploratory Well Costs Capitalized for More than One Year, Name [Domain]
Project [Domain]
TETLP Expansion Project [Member]
TETLP Expansion Project [Member]
TETLP Expansion Project [Member]
White Oak Lateral Project Filing [Member]
White Oak Lateral Project Filing [Member]
White Oak Lateral Project Filing [Member]
Geographical [Axis]
Geographical [Axis]
Segment, Geographical [Domain]
Geographical [Domain]
Florida [Member]
Florida [Member]
Florida [Member]
Eastern Shore [Member]
Eastern Shore Gas Company [Member]
Eastern shore Gas Company.
Rates and Other Regulatory Activities [Line Items]
Investment In Affiliates [Line Items]
Investment In Affiliates [Line Items]
Reduction in accumulated depreciation
Reduction in accumulated depreciation
Reduction in accumulated depreciation
Public Utilities, Interim Rate Increase (Decrease), Amount
Public Utilities, Interim Rate Increase (Decrease), Amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Estimated Environmental Cleanup Costs To Be Recovered
Estimated Environmental Cleanup Costs To Be Recovered
Estimated Environmental Cleanup Costs To Be Recovered
Increase in Pipeline Capacity
Total Capacity After Pipeline Improvements
Total Capacity After Pipeline Improvements
Estimated capital cost
Estimated Capital Cost
Estimated Capital Cost
White Oak lateral capacity of firm transportation service
Lateral Capacity Of Firm Transportation Service
Lateral Capacity Of Firm Transportation Service
White Oak lateral length of pipeline to be installed
Lateral Length Of Pipeline To Be Installed
Lateral Length Of Pipeline To Be Installed
Lateral diamater of pipeline to be installed
Lateral Diameter Of Pipeline To Be Installed
Lateral Diameter Of Pipeline To Be Installed
New plant capacity volume
New Plant Capacity Volume
New Plant Capacity Volume
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Summary of Changes in Fair Value of Investments
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Mark-to-market energy assets [Member]
Mark To Market Energy Assets [Member]
Mark-to-market energy assets.
Mark-to-market energy liabilities [Member]
Mark To Market Energy Liabilities [Member]
Mark to market energy liabilities.
Derivative, by Nature [Axis]
Derivative, by Nature [Axis]
Derivative, Name [Domain]
Derivative, Name [Domain]
Forward Contracts [Member]
Forward Contracts [Member]
Call options [Member]
Call Option [Member]
Put Option [Member]
Put Option [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Derivatives designated as fair value hedges [Member]
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Document Period End Date
Document Period End Date
Derivatives asset not designated as hedging instruments, Forward contracts, Asset Derivatives
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value
Derivatives asset not designated as hedging instruments, Call Option, Derivatives assets
Derivative Asset
Derivatives designated as fair value hedges, Asset derivatives
Derivative Asset, Fair Value, Amount Not Offset Against Collateral
Derivatives not designated as hedging instruments, Liability derivatives
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Transfers in due to change in trustee
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Purchases and adjustments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)
Transfers
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Investment Income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Ending Balance
Long-term debt including current maturities
Long-term Debt
Fair value of long-term debt
Long-term Debt, Fair Value
Total Long-term debt
Long-term Debt and Capital Lease Obligations
Outstanding Trading Contracts
Schedule of Derivative Instruments [Table Text Block]
Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements
Derivative Instruments, Gain (Loss) [Table Text Block]
Effects of Trading Activities on Condensed Consolidated Statements of Income
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
Investments, Debt and Equity Securities [Abstract]
Investments
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Total compensation expense
Allocated Share-based Compensation Expense
Less: tax benefit
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Share-Based Compensation amounts included in net income
Allocated Share-based Compensation Expense, Net of Tax
Commitments and Contingencies Disclosure [Abstract]
Other Contingencies And Commitments [Table]
Other Contingencies And Commitments [Table]
Other Contingencies And Commitments [Table]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
September 12, 2013 [Member]
Letter Of Credit Two [Member]
Letter of credit two.
December 2, 2013 [Member]
Letters of Credit Three [Member]
Letters of Credit Three [Member]
June 1, 2014 [Member]
Letters of Credit Four [Member]
Letters of Credit Four [Member]
TETLP Letter of Credit [Member]
Letter Of Credit One [Member]
Letter of credit one.
Texas Eastern Transmission, LP [Member]
Tetlp [Member]
TETLP.
Other Contingencies And Commitments [Line Items]
Other Contingencies And Commitments [Line Items]
Other Contingencies And Commitments [Line Items]
Number of years to purchase propane under contract
Number Of Years To Purchase Propane Under Contract
Number Of Years To Purchase Propane Under Contract
Annual Estimate Of Volume Of Propane To Be Purchased
Annual Estimate Of Volume Of Propane To Be Purchased
Annual Estimate Of Volume Of Propane To Be Purchased
Total liabilities to tangible net worth minimum times
Maximum Liabilities To Tangible Net Worth Ratio Under Agreement One
Maximum liabilities to tangible net worth ratio under agreement one.
Fixed charge coverage ratio minimum times
Minimum Fixed Charge Coverage Ratio Under Agreement One
Minimum fixed charge coverage ratio under agreement one.
Time to cure ratio
Maximum Days To Make Default Good
Maximum days to make default good.
Funds from operations interest coverage ratio minimum times
Minimum Interest Coverage Ratio Under Agreement Two
Minimum interest coverage ratio under agreement two.
Total debt to capital maximum
Maximum Debt To Net Capital Ratio Under Agreement Two
Maximum debt to net capital ratio under agreement two.
Maximum authorized liability under such guarantees and letters of credit
Maximum Authorized Amount Under Corporate Guarantees And Letters Of Credit
Maximum authorized amount under corporate guarantees and letters of credit.
Aggregate guaranteed amount
Guarantor Obligations, Maximum Exposure, Undiscounted
Amount of letter of credit to our current primary insurance company
Standby Letters Of Credit
Standby Letters Of Credit
Draws on letters of credit
Letters of Credit Outstanding, Amount
Liability for Uncertain Tax Positions, Noncurrent
Liability for Uncertain Tax Positions, Noncurrent
Unrecognized Tax Benefits
Sales and Excise Tax Payable
Share-Based Compensation Amounts Included in Net Income
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Summary of Stock Activity under SICP
Schedule of Share-based Compensation, Activity [Table Text Block]
Equity [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
[Line Items] for Reclassification out of Accumulated Other Comprehensive Income [Table]
Amortization of pension and postretirement items:
Pension and Other Postretirement Benefit Expense [Abstract]
Prior service cost
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax
Net loss
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax
Tax benefit
Net of tax
Net Income (Loss) Available to Common Stockholders, Basic
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurement Frequency [Domain]
Recurring [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Estimate of Fair Value, Fair Value Disclosure [Member]
Estimate of Fair Value Measurement [Member]
Quoted Prices in Active Markets (Level 1) [Member]
Fair Value, Inputs, Level 1 [Member]
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Inputs, Level 2 [Member]
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Inputs, Level 3 [Member]
Asset Class [Axis]
Asset Class [Axis]
Fair Value by Asset Class [Domain]
Asset Class [Domain]
Investments in equity securities [Member]
Equity Securities [Member]
Investments in guaranteed income fund [Member]
Guaranteed Income Fund [Member]
Guaranteed Income Fund [Member]
Investments - other [Member]
Other Investments [Member]
Mark To Market Energy Assets Including Put Option [Member]
Mark To Market Energy Assets Including Put Option [Member]
Mark to market energy assets including put option.
Liability Class [Axis]
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
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]
Assets:
Assets, Fair Value Disclosure [Abstract]
Investments
Investments, Fair Value Disclosure
Mark-to-market energy assets
Liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Mark-to-market energy liabilities
Derivative Liability
Accounting Policies [Abstract]
New Accounting Pronouncements or Change in Accounting Principle [Table]
New Accounting Pronouncements or Change in Accounting Principle [Table]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
Adjustments for Change in Accounting Principle [Axis]
Adjustments for Change in Accounting Principle [Axis]
Adjustments for Change in Accounting Principle [Domain]
Adjustments for Change in Accounting Principle [Domain]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Reclassifications
Reclassification, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
Compensation and Retirement Disclosure [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Chesapeake Pension Plan [Member]
Chesapeake Pension Plan [Member]
Chesapeake pension plan.
Consolidated [Member]
Consolidated [Member]
Consolidated [Member]
FPU Pension Plan [Member]
Florida Public Utilities Company Pension Plan [Member]
Florida public utilities company pension plan.
Chesapeake Pension SERP [Member]
Chesapeake Pension Serp [Member]
Chesapeake pension SERP.
Chesapeake Postretirement Plan [Member]
Chesapeake Postretirement Plan [Member]
Chesapeake postretirement plan.
FPU Medical Plan [Member]
Florida Public Utilities Company Medical Plan [Member]
Florida public utilities company medical plan.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Expected pension and postretirement benefit costs
Expected Pension And Postretirement Benefit Costs
Expected pension and postretirement benefit costs.
Expected amortization of pre merger regulatory asset
Expected Amortization Of Pre Merger Regulatory Asset
Expected amortization of pre merger regulatory asset.
Unamortized balance of regulatory asset
Unamortized Balance Of Regulatory Asset
Unamortized balance of regulatory asset.
Defined Benefit Plan, Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost
Contribution to pension plan
Defined Benefit Plan, Contributions by Employer
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year
Environmental Remediation Obligations [Abstract]
Environmental Commitments And Contingencies [Table]
Environmental Commitments And Contingencies [Table]
Environmental Commitments And Contingencies [Table]
FPU [Member]
Florida Public Utilities Company [Member]
Florida public utilities company.
Chesapeake [Member]
Chesapeake [Member]
Chesapeake [Member]
Manufactured Gas Plant [Member]
Manufactured Gas Plant [Member]
Manufactured Gas Plant [Member]
West Palm Beach Florida [Member]
West Palm Beach Florida [Member]
West Palm Beach Florida.
Sanford Florida [Member]
Sanford Florida [Member]
Sanford Florida.
Environmental Commitments And Contingencies [Line Items]
Environmental Commitments And Contingencies [Line Items]
Environmental Commitments And Contingencies [Line Items]
Company's exposure in number of former Manufactured Gas Plant Sites
Companys Exposure In Number Of Former Manufactured Gas Plant Sites
Company's exposure in number of former Manufactured Gas Plant Sites.
Environmental liabilities
Accrued Environmental Loss Contingencies, Noncurrent
Approval of recovery of environmental costs
Maximum Amount Of Environmental Costs That Can Be Recovered From Insurance And Customers
Maximum amount of environmental costs that can be recovered from insurance and customers.
Environmental costs recovered
Environmental Costs Recognized, Recovery Credited to Expense
Regulatory assets for future recovery of environmental costs
Regulatory Assets Related To Environmental Costs
Regulatory assets related to environmental costs.
Estimated costs of remediation range, minimum
Environmental Exit Costs, Reasonably Possible Additional Losses, Low Estimate
Estimated costs of remediation range, maximum
Environmental Exit Costs, Reasonably Possible Additional Losses, High Estimate
Environmental remediation expense percent
Percentage Of Share In Remediation Costs
Percentage of share in remediation costs.
Amount paid for funding requirements
Payments for Environmental Liabilities
Cost of remedy for settlements of claims
Estimated Environmental Remediation Expense
Estimated environmental remediation expense.
Environmental remediation expense
Environmental Remediation Expense
Statement of Financial Position [Abstract]
Property, Plant and Equipment
Property, Plant and Equipment, Net [Abstract]
Regulated energy
Public Utilities, Property, Plant and Equipment, Plant in Service
Unregulated energy
Unregulated Energy Property Plant And Equipment
Unregulated energy.
Other
Property, Plant and Equipment, Other, Gross
Total property, plant and equipment
Property, Plant and Equipment, Gross
Less: Accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Plus: Construction work in progress
Construction in Progress, Gross
Net property, plant and equipment
Property, Plant and Equipment, Net
Current Assets
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Accounts receivable (less allowance for uncollectible accounts of $1,976 and $1,635, respectively)
Accounts Receivable, Net, Current
Accrued revenue
Accrued Revenue
Accrued revenue.
Propane inventory, at average cost
Energy Related Inventory, Propane Gas
Other inventory, at average cost
Other Inventory, Gross
Storage gas prepayments
Energy Related Inventory, Natural Gas in Storage
Prepaid expenses
Prepaid Expense, Current
Income taxes receivable
Income Taxes Receivable, Current
Mark-to-market energy assets
Energy Marketing Contracts Assets, Current
Regulatory assets
Regulatory Assets, Current
Deferred income taxes
Deferred Tax Assets, Net of Valuation Allowance, Current
Other current assets
Other Assets, Current
Total current assets
Assets, Current
Deferred Charges and Other Assets
Deferred Charges And Other Assets [Abstract]
Deferred Charges and Other Assets.
Investments, at fair value
Regulatory assets
Regulatory Assets, Noncurrent
Goodwill
Goodwill
Other intangible assets, net
Intangible Assets, Net (Excluding Goodwill)
Receivables and other deferred charges
Receivables And Other Deferred Charges
Receivables and other deferred charges
Total deferred charges and other assets
Deferred Charges And Other Assets
Total deferred charges and other assets
Total Assets
Stockholders' equity
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value $0.4867 per share (authorized 25,000,000 shares)
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital, Common Stock
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Deferred compensation obligation
Deferred Compensation Equity
Treasury stock
Treasury Stock, Value
Total stockholders' equity
Long-term debt, net of current maturities
Long-term Debt, Excluding Current Maturities
Total capitalization
Capitalization, Long-term Debt and Equity
Current Liabilities
Liabilities, Current [Abstract]
Current portion of long-term debt
Long-term Debt, Current Maturities
Short-term borrowing
Short-term Debt
Accounts payable
Accounts Payable, Current
Accrued compensation
Employee-related Liabilities, Current
Accrued interest
Interest Payable, Current
Dividends payable
Dividends Payable, Current
Income Taxes Payable
Accrued Income Taxes, Current
Mark-to-market energy liabilities
Energy Marketing Contract Liabilities, Current
Regulatory liabilities
Regulatory Liability, Current
Customer deposits and refunds
Customer Advances and Deposits, Current
Other accrued liabilities
Other Accrued Liabilities, Current
Total current liabilities
Liabilities, Current
Deferred Credits and Other Liabilities
Deferred Revenue and Credits, Noncurrent [Abstract]
Deferred income taxes
Deferred Tax Liabilities, Net, Noncurrent
Deferred investment tax credits
Accumulated Deferred Investment Tax Credit
Regulatory liabilities
Regulatory Liability, Noncurrent
Accrued asset removal cost-Regulatory liability
Accrued Asset Removal Cost Regulatory Liability
Accrued asset removal cost--Regulatory liability
Other pension and benefit costs
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent
Other liabilities
Other Liabilities, Noncurrent
Total deferred credits and other liabilities
Deferred Credits and Other Liabilities
Other commitments and contingencies (Note 6)
Commitments and Contingencies
Total Capitalization and Liabilities
Liabilities and Equity
Debt Conversion Description [Axis]
Debt Conversion Description [Axis]
Debt Conversion, Name [Domain]
Debt Conversion, Name [Domain]
Convertible Debt Securities [Member]
Convertible Debt Securities [Member]
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]
Aggregate Unsecured Senior Notes [Member]
Aggregate Unsecured Senior Notes [Member]
Aggregate Unsecured Senior Notes [Member]
Long term debt maximum borrowing capacity
Long Term Debt Commitment
Long Term Debt Commitment
Total long-term debt
Repayments of Long-term Debt
Repayments of Long-term Debt
Debt Conversion, Converted Instrument, Amount
Debt Conversion, Converted Instrument, Amount
Repayments of Convertible Debt
Repayments of Convertible Debt
Share-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Fair Value of Financial Instruments
Fair Value Disclosures [Text Block]
Derivative [Table]
Derivative [Table]
Designated as Hedging Instrument [Member]
Mark To Market Energy Assets [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Derivative [Line Items]
Derivative [Line Items]
Purchase quantity for propane price cap
Purchase Quantity For Propane Price Cap
Purchase quantity for propane price cap.
Strike price of put option
Derivative, Price Risk Option Strike Price
Payment to purchase put option
Payment To Purchase Put Option
Payment to purchase put option.
Derivative asset, fair value, net
Payment to purchase call options
Payments for Derivative Instrument, Financing Activities
Fair value of call options
Number of counterparties under master netting agreements
Number Of Counterparties With Master Repurchase Agreements
Number Of Counterparties With Master Repurchase Agreements
Rights to offset accounts receivable
Accounts Receivable Subject To Master Netting Arrangement
Accounts Receivable Subject To Master Netting Arrangement
Rights to offset accounts payable
Accounts Payable Subject To Master Netting Arrangement
Accounts Payable Subject To Master Netting Arrangement
Gain (Loss) on Sale of Derivatives
Derivative, Gain on Derivative
Derivative Instruments
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Prior service cost (credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Net loss
Defined Benefit Plan, Future Amortization of Gain (Loss)
Recognized from accumulated other comprehensive loss
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax
Recognized from regulatory asset
Defined Benefit Plan Amounts Recognized From Regulatory Asset
Defined Benefit Plan Amounts Recognized From Regulatory Asset
Total recognized in net periodic benefit cost
Defined Benefit Plan Amounts Recognized Gain (Loss)
Defined Benefit Plan Amounts Recognized Gain (Loss)
Segment Information
Segment Reporting Disclosure [Text Block]
Document Document And Entity Information [Abstract]
Document Document and Entity Information [Abstract]
Document Information [Table]
Document Information [Table]
Entity Information [Line Items]
Entity Information [Line Items]
Entity Registrant Name
Entity Registrant Name
Trading Symbol
Trading Symbol
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Rates and Other Regulatory Activities
Public Utilities Disclosure [Text Block]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Beginning balance
Other comprehensive loss before reclassifications
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Amounts reclassified from accumulated other comprehensive loss
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Net current-period other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Ending balance
Statement of Partners' Capital [Abstract]
Employee Benefits, net of tax:
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Amortization of prior service cost, net of tax of ($6) and ($6), respectively
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax
Net gain, net of tax of $27 and $38, respectively
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax
Total other comprehensive income
Comprehensive Income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) [Table]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Revenue [Member]
Sales [Member]
Derivatives not designated as hedging instruments [Member]
Not Designated as Hedging Instrument [Member]
Call Option [Member]
Put/Call Option [Member]
Put Or Call Option [Member]
Put Or Call Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivatives
Unrealized Gain (Loss) on Derivatives
Schedule of Segment Reporting Information by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Allowance for uncollectible accounts
Allowance for Doubtful Accounts Receivable, Current
Common stock, par value (in usd per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Changes in Accumulated Other Comprehensive Loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Tax expense recognized on the amortization of prior service cost
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax
Tax expense recognized on the net gain (loss)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax
Outstanding Long-Term Debt
Schedule of Debt [Table Text Block]
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Statement of Cash Flows [Abstract]
Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization
Depreciation and accretion included in other costs
Depreciation And Accretion Included In Other Costs
Depreciation and accretion included in other costs
Deferred income taxes, net
Deferred Income Tax Expense (Benefit)
(Gain) loss on sale of assets
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Unrealized (gain) loss on commodity contracts
Unrealized Gain (Loss) on Commodity Contracts
Unrealized gain on investments
Unrealized Gain (Loss) on Investments
Realized gain on sales of investments, net
Gain (Loss) on Sale of Investments
Employee benefits
Employee Benefits and Share-based Compensation
Share-based compensation
Share-based Compensation
Other, net
Other Noncash Income (Expense)
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Purchase of investments
Increase (Decrease) in Trading Securities
Accounts receivable and accrued revenue
Increase (Decrease) in Accounts Receivable
Propane inventory, storage gas and other inventory
Increase (Decrease) in Inventories
Regulatory assets
Increase (Decrease) in Other Regulatory Assets
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable and other accrued liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Income taxes receivable
Increase (Decrease) in Income Taxes Receivable
Accrued interest
Increase (Decrease) in Interest Payable, Net
Customer deposits and refunds
Increase (Decrease) in Customer Deposits
Accrued compensation
Increase (Decrease) in Employee Related Liabilities
Regulatory liabilities
Increase (Decrease) in Regulatory Liabilities
Other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Investing Activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Property, plant and equipment expenditures
Payments to Acquire Property, Plant, and Equipment
Proceeds from sales of assets
Proceeds from Sale of Productive Assets
Payments to Acquire Businesses, Gross
Payments to Acquire Businesses, Gross
Environmental expenditures
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing Activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Common stock dividends
Payments of Ordinary Dividends, Common Stock
Purchase of stock for Dividend Reinvestment Plan
Proceeds from (Repurchase of) Equity
Change in cash overdrafts due to outstanding checks
Increase (Decrease) in Outstanding Checks, Financing Activities
Net borrowing (repayment) under line of credit agreements
Proceeds from (Repayments of) Lines of Credit
Repayment of long-term debt
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Net Decrease in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and Cash Equivalents-Beginning of Period
Cash and Cash Equivalents-End of Period
Employee Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Business Combinations [Abstract]
Acquisitions
Business Combination Disclosure [Text Block]
Unrealized gain, net of other expenses
Trading Securities, Change in Unrealized Holding Gain (Loss)
Calculation of Earnings Per Share
Earnings Per Share [Text Block]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Table]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Table]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Table]
8.25% Convertible debentures [Member]
Eight Point Two Five Percent Senior Debentures [Member]
Eight Point Two Five Percent Senior Debentures [Member]
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Debt Instrument, Interest Rate During Period
Debt Instrument, Interest Rate During Period
Investment [Table]
Investment [Table]
Investment Holding [Axis]
Investment Holding [Axis]
Investment Holding [Domain]
Investment Holding [Domain]
Investment [Line Items]
Investment [Line Items]
Environmental Commitments and Contingencies
Environmental Loss Contingency Disclosure [Text Block]
Florida Public Utilities Company [Member]
Key West Florida [Member]
Key West Florida [Member]
Key West Florida [Member]
Pensacola Florida [Member]
Pensacola Florida [Member]
Pensacola Florida [Member]
Winter Haven Florida [Member]
Winter Haven Florida [Member]
Winter Haven Florida [Member]
Salisbury Maryland [Member]
Salisbury Maryland [Member]
Salisbury Maryland [Member]
Period of regulatory inactivity
Period Of Regulatory Inactivity
Period of regulatory inactivity.
Costs to resolve liability
Environmental Exit Costs, Anticipated Cost
Remedial action time period
Period To Meet Remedial Action Objectives
Period to meet remedial action objectives.
Additional remediation costs
Estimated Additional Possible Future Environmental Remediation
Estimated Additional Possible Future Environmental Remediation
Corrective measures cost
Environmental Exit Costs, Reasonably Possible Additional Loss
Monitoring well remaining maximum cost
Maximum Costs Of Monitoring Well
Maximum costs of monitoring well.
Other Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Eastern Shore Gas Company [Member]
Fort Meade [Member]
Fort Meade [Member]
Fort Meade [Member]
Propane Acquisition [Member]
Propane [Member]
Propane [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Inventory Purchase Accounting Adjustment
Inventory Purchase Accounting Adjustments
Inventory, purchase accounting adjustments
Purchase Price Adjustment
Purchase Price Adjustment
Purchase Price Adjustment
Number of residential and commercial customers receiving propane gas distribution service
Number Of Residential And Commercial Customers Receiving Propane Distribution Service
Number of residential and commercial customers receiving propane distribution service.
Minimum number of customers to whom gas distribution systems and bulk delivery service provided
Minimum Number Of Customers Provided Bulk Delivery Service
Minimum Number Of Customers Provided Bulk Delivery Service
Purchase price allocated to property, plant and equipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Purchase price allocated to propane and other inventory
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory
Receivables
Business Combination, Acquired Receivables, Fair Value
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities
Revenues
Net Income (Loss) Attributable to Parent
Purchase price allocated to intangible assets related to customer list
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Payments to Acquire Businesses, Gross
Sales Tax
Business Acquisition, Cost of Acquired Entity, Transaction Costs, Sales Tax
Business Acquisition, Cost of Acquired Entity, Transaction Costs, Sales Tax
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other
Goodwill, Purchase Accounting Adjustments
Goodwill, Purchase Accounting Adjustments
Employee Benefit Plans
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Amounts Included in Regulatory Asset and Accumulated Other Comprehensive Income/Loss Recognized as Net Periodic Benefit Cost
Amounts Included In Regulatory Asset And Other Comprehensive Income Loss Table [Text Block]
Amounts Included In Regulatory Asset And Other Comprehensive Income Loss [Table Text Block]
Interest cost
Defined Benefit Plan, Interest Cost
Expected return on plan assets
Defined Benefit Plan, Expected Return on Plan Assets
Amortization of prior service cost
Amortization of net loss
Net periodic cost (benefit)
Amortization of pre-merger regulatory asset
Amortization Of Pre Merger Regulatory Asset
Amortization of pre-merger regulatory asset.
Total periodic cost
Periodic Cost Benefit
Periodic Cost Benefit
Promissory note [Member]
Promissory Note [Member]
Promissory note.
Capital Lease Obligations
Capital Lease Obligations
Total Long-term debt
Less: current maturities
Total long-term debt, net of current maturities
Significant Accounting Policies [Text Block]
Significant Accounting Policies [Text Block]
Service period [Axis]
Service period [Axis]
Service period [Axis]
Service period [Domain]
Service period [Domain]
[Domain] for Service period [Axis]
2014-2016 service period [Member]
2014-2016 service period [Member]
2014-2016 service period [Member]
2013-2015 service period [Member]
2013-2015 service period [Member]
2013-2015 service period [Member]
Amortization of expense equally over a service period
Period For Amortization Of Share Based Expenses
Period for amortization of share based expenses.
Unrecognized compensation expense related to the awards to non-employee directors
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options
Granted awards, shares
Vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Intrinsic value of the SICP awards
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants Intrinsic Value
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants Intrinsic Value
Income Statement [Abstract]
Operating Revenues
Revenues [Abstract]
Regulated energy
Regulated Operating Revenue
Unregulated energy
Unregulated Operating Revenue
Other
Other Revenue, Net
Total Operating Revenues
Operating Expenses
Operating Expenses [Abstract]
Regulated energy cost of sales
Regulated Energy Cost Of Sales
Regulated energy cost of sales
Unregulated energy and other cost of sales
Unregulated Energy And Other Cost Of Sales
Unregulated energy and other cost of sales
Operations
Operations
Operations.
Maintenance
Maintenance Costs
Other taxes
Taxes, Other
Total Operating Expenses
Operating Expenses
Operating Income
Interest charges
Weighted Average Common Shares Outstanding:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Earnings Per Share of Common Stock:
Basic (in usd per share)
Earnings Per Share, Basic
Diluted (in usd per share)
Earnings Per Share, Diluted
Calculation of Basic Earnings Per Share:
Earnings Per Share, Basic [Abstract]
Weighted shares outstanding - Basic (in shares)
Basic Earnings Per Share (in usd per share)
Calculation of Diluted Earnings Per Share:
Earnings Per Share, Diluted [Abstract]
Reconciliation of Numerator:
Reconciliation Of Numerator [Abstract]
Reconciliation of numerator:
Effect of 8.25% Convertible debentures
Interest on Convertible Debt, Net of Tax
Adjusted numerator-Diluted
Net Income (Loss) Available to Common Stockholders, Diluted
Reconciliation of Denominator:
Reconciliation Of Denominator [Abstract]
Reconciliation of denominator.
Effect of dilutive securities:
Effect Of Dilutive Securities [Abstract]
Effect of dilutive securities.
Share-based Compensation (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
8.25% Convertible debentures (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities
Adjusted denominator-Diluted (in shares)
Diluted Earnings Per Share (in usd per share)
Long-Term Debt
Long-term Debt [Text Block]
Accumulated Other Comprehensive Income (Loss)
Comprehensive Income (Loss) Note [Text Block]
Trading Activities, Gain and Losses, by Type, by Income Statement Location [Table]
Trading Activities, Gain and Losses, by Type, by Income Statement Location [Table]
Option Indexed to Issuer's Equity, Type [Axis]
Option Indexed to Issuer's Equity, Type [Axis]
Option Indexed to Issuer's Equity, Type [Domain]
Option Indexed to Issuer's Equity, Type [Domain]
Options [Member]
Options [Member]
Options [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized gain (loss) on forward contracts Revenue
Total
Derivative, Gain (Loss) on Derivative, Net