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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans |
|  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan
For the Three Months Ended March 31, |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 105 |  |  | $ | 102 |  |  | $ | 630 |  |  | $ | 626 |  |  | $ | 23 |  |  | $ | 23 |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | 14 |  |  | $ | 15 |
Expected return on plan assets |  | (131 | ) |  | (135 | ) |  | (701 | ) |  | (777 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | (20 | ) |  | (19 | ) |  | — |  |  | — |
Amortization of net loss |  | 104 |  |  | 90 |  |  | 128 |  |  | 114 |  |  | 22 |  |  | 25 |  |  | 18 |  |  | 17 |  |  | — |  |  | 2 |
Net periodic cost (benefit) |  | 78 |  |  | 57 |  |  | 57 |  |  | (37 | ) |  | 45 |  |  | 50 |  |  | 9 |  |  | 9 |  |  | 14 |  |  | 17 |
Amortization of pre-merger regulatory asset |  | — |  |  | — |  |  | 191 |  |  | 190 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Total periodic cost |  | $ | 78 |  |  | $ | 57 |  |  | $ | 248 |  |  | $ | 153 |  |  | $ | 45 |  |  | $ | 50 |  |  | $ | 9 |  |  | $ | 9 |  |  | $ | 16 |  |  | $ | 19 |
For the Three Months Ended March 31, 2016 |  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (20 | ) |  | $ | — |  |  | $ | (20 | )
Net loss |  | 104 |  |  | 128 |  |  | 22 |  |  | 18 |  |  | — |  |  | 272 |
Total recognized in net periodic benefit cost |  | $ | 104 |  |  | $ | 128 |  |  | $ | 22 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 252 |
Recognized from accumulated other comprehensive loss (1) |  | $ | 104 |  |  | $ | 24 |  |  | $ | 22 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 148 |
Recognized from regulatory asset |  | — |  |  | 104 |  |  | — |  |  | — |  |  | — |  |  | 104 |
Total |  | $ | 104 |  |  | $ | 128 |  |  | $ | 22 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 252 |
For the Three Months Ended March 31, 2015 |  | Chesapeake Pension Plan |  | FPU Pension Plan |  | Chesapeake SERP |  | Chesapeake Postretirement Plan |  | FPU Medical Plan |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | (19 | ) |  | $ | — |  |  | $ | (17 | )
Net loss |  | 90 |  |  | 114 |  |  | 25 |  |  | 17 |  |  | 2 |  |  | 248 |
Total recognized in net periodic benefit cost |  | $ | 90 |  |  | $ | 114 |  |  | $ | 27 |  |  | $ | (2 | ) |  | $ | 2 |  |  | $ | 231 |
Recognized from accumulated other comprehensive loss (1) |  | $ | 90 |  |  | $ | 22 |  |  | $ | 27 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 137 |
Recognized from regulatory asset |  | — |  |  | 92 |  |  | — |  |  | — |  |  | 2 |  |  | 94 |
Total |  | $ | 90 |  |  | $ | 114 |  |  | $ | 27 |  |  | $ | (2 | ) |  | $ | 2 |  |  | $ | 231 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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