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Environmental Commitments and Contingencies (Details Textual) (USD $) | 6 Months Ended |
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Jun. 30, 2012 Property | Jun. 30, 2011 | Dec. 31, 2011
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Environmental liabilities | $ 9,298,000 |  | $ 9,492,000
Amount paid for funding requirements | 194,000 | 326,000 |
Environmental Commitments and Contingencies (Additional Textual) [Abstract] |  |  |
Company's exposure in number of former Manufactured Gas Plant Sites | 6 |  |
FPU [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Environmental liabilities | 10,900,000 |  |
Approval of recovery of environmental costs | 14,000,000 |  |
Environmental costs recovered | 8,500,000 |  |
Chesapeake [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Environmental liabilities | 223,000 |  |
Regulatory assets for future recovery of environmental costs | 792,000 |  |
Manufactured Gas Plant [Member] | FPU [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Regulatory assets for future recovery of environmental costs | 5,500,000 |  |
West Palm Beach Florida [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Estimated costs of remediation range, minimum | 4,600,000 |  |
Estimated costs of remediation range, maximum | 15,700,000 |  |
Sanford Florida [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Estimated costs of remediation range, maximum | 13,000,000 |  |
Cost of remedy for settlements of claims | 20,000,000 |  |
Costs to resolve liability | 650,000 |  |
Sanford Florida [Member] | FPU [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Estimated costs of remediation range, maximum | 650,000 |  |
Environmental remediation expense percent | 5.00% |  |
Amount paid for funding requirements | 650,000 |  |
Environmental Remediation Expense | 24,000 |  |
Key West Florida [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Period of regulatory inactivity | 17 years |  |
Key West Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Costs to resolve liability | 100,000 |  |
Pensacola Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Costs to resolve liability | 5,000 |  |
Salisbury Maryland [Member] | Maximum [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Monitoring well remaining maximum cost | 5,000 |  |
Winter Haven Florida [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Operating and monitoring system cost | 46,000 |  |
Cost of excavation | 250,000 |  |
Corrective measures cost | $ 1,000,000 |  |
Winter Haven Florida [Member] | Maximum [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Remedial action time period | 3 years |  |
Winter Haven Florida [Member] | Minimum [Member] |  |  |
Environmental Commitments and Contingencies (Textual) [Abstract] |  |  |
Remedial action time period | 2 years |  |

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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161, 163 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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