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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | Net periodic benefit costs for our pension and post-retirement benefits plans for the three months ended March 31, 2018 and 2017 are set forth in the following tables:
|  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan
For the Three Months Ended March 31, |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 97 |  |  | $ | 103 |  |  | $ | 592 |  |  | $ | 623 |  |  | $ | 21 |  |  | $ | 22 |  |  | $ | 10 |  |  | $ | 10 |  |  | $ | 12 |  |  | $ | 13 |
Expected return on plan assets |  | (138 | ) |  | (127 | ) |  | (774 | ) |  | (699 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (19 | ) |  | (19 | ) |  | — |  |  | — |
Amortization of net loss |  | 88 |  |  | 107 |  |  | 109 |  |  | 131 |  |  | 25 |  |  | 22 |  |  | 15 |  |  | 16 |  |  | — |  |  | — |
Net periodic cost (benefit) (1) |  | 47 |  |  | 83 |  |  | (73 | ) |  | 55 |  |  | 46 |  |  | 44 |  |  | 6 |  |  | 7 |  |  | 12 |  |  | 13 |
Amortization of pre-merger regulatory asset |  | — |  |  | — |  |  | 191 |  |  | 191 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Total periodic cost |  | $ | 47 |  |  | $ | 83 |  |  | $ | 118 |  |  | $ | 246 |  |  | $ | 46 |  |  | $ | 44 |  |  | $ | 6 |  |  | $ | 7 |  |  | $ | 14 |  |  | $ | 15 |
Amounts Included in Regulatory asset and AOCI [Table Text Block] | The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three months ended March 31, 2018 and 2017:
For the Three Months Ended March 31, 2018 |  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (19 | ) |  | $ | — |  |  | $ | (19 | )
Net loss |  | 88 |  |  | 109 |  |  | 25 |  |  | 15 |  |  | — |  |  | 237 |
Total recognized in net periodic benefit cost |  | 88 |  |  | 109 |  |  | 25 |  |  | (4 | ) |  | — |  |  | 218 |
Recognized from accumulated other comprehensive loss (1) |  | 88 |  |  | 21 |  |  | 25 |  |  | (4 | ) |  | — |  |  | 130 |
Recognized from regulatory asset |  | — |  |  | 88 |  |  | — |  |  | — |  |  | — |  |  | 88 |
Total |  | $ | 88 |  |  | $ | 109 |  |  | $ | 25 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | 218 |
For the Three Months Ended March 31, 2017 |  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (19 | ) |  | $ | — |  |  | $ | (19 | )
Net loss |  | 107 |  |  | 131 |  |  | 22 |  |  | 16 |  |  | — |  |  | 276 |
Total recognized in net periodic benefit cost |  | 107 |  |  | 131 |  |  | 22 |  |  | (3 | ) |  | — |  |  | 257 |
Recognized from accumulated other comprehensive loss (1) |  | 107 |  |  | 25 |  |  | 22 |  |  | (3 | ) |  | — |  |  | 151 |
Recognized from regulatory asset |  | — |  |  | 106 |  |  | — |  |  | — |  |  | — |  |  | 106 |
Total |  | $ | 107 |  |  | $ | 131 |  |  | $ | 22 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | 257 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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