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Employee Benefit Plans (Details Textual) (USD $) | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Chesapeake Pension Plan [Member] | Jun. 30, 2012 Chesapeake Pension Plan [Member] | Jun. 30, 2012 FPU Pension Plan [Member] | Jun. 30, 2012 FPU Pension Plan [Member] | Jun. 30, 2012 Chesapeake Pension SERP [Member] | Jun. 30, 2012 Chesapeake Pension SERP [Member] | Jun. 30, 2012 Chesapeake Postretirement Plan [Member] | Jun. 30, 2012 Chesapeake Postretirement Plan [Member] | Jun. 30, 2012 FPU Medical Plan [Member] | Jun. 30, 2012 FPU Medical Plan [Member]
Employee Benefit Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Expected pension and postretirement benefit costs | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Expected amortization of pre merger regulatory asset |  |  |  |  |  | 769,000 |  |  |  |  |  |
Unamortized balance of regulatory asset | 5,500,000 | 5,900,000 |  |  |  |  |  |  |  |  |  |
Contribution to pension plan |  |  | 110,000 | 273,000 | 413,000 | 705,000 | 22,000 | 45,000 | 28,000 | 40,000 | 100,000 | 158,000
Additional contribution to pension plan |  |  | 1,300,000 | 1,300,000 | 2,000,000 | 2,000,000 | 88,000 | 88,000 | 87,000 | 87,000 | 193,000 | 193,000
Period of Average for corporate bond rate to measure pension obligations for pension funding purposes | 25 years |  |  |  |  |  |  |  |  |  |  |
Estimated reduction of employer discretionary contributions to pension plans |  |  |  | $ 915,000 |  | $ 1,200,000 |  |  |  |  |  |

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- Definition Estimated reduction of employer discretionary contributions to pension plans. + References No definition available. + Details
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- Definition Expected amortization of pre merger regulatory asset. + References No definition available. + Details
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- Definition Expected pension and postretirement benefit costs. + References No definition available. + Details
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- Definition Period of Average for corporate bond rate to measure pension obligations for pension funding purposes. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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