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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
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, 2021 and 2020 are set forth in the following tables:
Chesapeake
Pension Plan
FPU
Pension Plan
Chesapeake SERPChesapeake
Postretirement
Plan
FPU
Medical
Plan
For the Three Months Ended March 31,2021202020212020202120202021202020212020
(in thousands)          
Interest cost$34 $46 $429 $518 $12 $16 $6 $$6 $10 
Expected return on plan assets(40)(42)(830)(745) —  —  — 
Amortization of prior service credit —  —  — (19)(19) — 
Amortization of net (gain) loss60 65 155 135 7 8 12 (2)— 
Net periodic cost (benefit)54 69 (246)(92)19 21 (5)4 10 
Amortization of pre-merger regulatory asset —  —  —  —  
Total periodic cost (benefit)$54 $69 $(246)$(92)$19 $21 $(5)$$4 $12 
Amounts Included in Regulatory asset and AOCI [Table Text Block]
The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three ended March 31, 2021 and 2020: 
For the Three Months Ended March 31, 2021Chesapeake
Pension
Plan
FPU
Pension
Plan
Chesapeake SERPChesapeake
Postretirement
Plan
FPU
Medical
Plan
Total
(in thousands)
Prior service credit$ $ $ $(19)$ $(19)
Net loss60 155 7 8 (2)228 
Total recognized in net periodic benefit cost60 155 7 (11)(2)209 
Recognized from accumulated other comprehensive loss/(gain) (1)
60 29 7 (11) 85 
Recognized from regulatory asset 126   (2)124 
Total$60 $155 $7 $(11)$(2)$209 
    
For the Three Months Ended March 31, 2020Chesapeake
Pension
Plan
FPU
Pension
Plan
Chesapeake SERPChesapeake
Postretirement
Plan
FPU
Medical
Plan
Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(19)
Net loss65 135 12 — 217 
Total recognized in net periodic benefit cost65 135 (7)— 198 
Recognized from accumulated other comprehensive loss/(gain) (1)
65 26 (7)— 89 
Recognized from regulatory asset— 109 — — — 109 
Total$65 $135 $$(7)$— $198 
    (1) See Note 9, Stockholders' Equity