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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 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 June 30,2021202020212020202120202021202020212020
(in thousands)          
Interest cost$34 $46 $429 $518 $12 $16 $6 $8 $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 5 10 12 (2)— 
Net periodic cost (benefit)54 69 (246)(92)19 21 (3)1 4 10 
Amortization of pre-merger regulatory asset— — — — — — — — — 2 
Total periodic cost (benefit)$54 $69 $(246)$(92)$19 $21 $(3)$1 $4 $12 
Chesapeake
Pension Plan		FPU
Pension Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan
For the Six Months Ended June 30,2021202020212020202120202021202020212020
(in thousands)          
Interest cost$68 $92 $858 $1,036 $24 $32 $12 $16 $12 $20 
Expected return on plan assets(80)(84)(1,660)(1,490)— — — — — — 
Amortization of prior service credit— — — — — — (38)(38)— — 
Amortization of net (gain) loss120 130 310 270 14 10 18 24 (4)— 
Net periodic cost (benefit)108 138 (492)(184)38 42 (8)2 8 20 
Amortization of pre-merger regulatory asset— — — — — — — — — 4 
Total periodic cost (benefit)$108 $138 $(492)$(184)$38 $42 $(8)$2 $8 $24 
Amounts Included in Regulatory asset and AOCI [Table Text Block]
The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three and six months ended June 30, 2021 and 2020: 
For the Three Months Ended June 30, 2021Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(19)
Net loss60 155 7 10 (2)230 
Total recognized in net periodic benefit cost60 155 7 (9)(2)211 
Recognized from accumulated other comprehensive loss/(gain) (1)
60 29 7 (9)— 87 
Recognized from regulatory asset— 126 — — (2)124 
Total$60 $155 $7 $(9)$(2)$211 
    
For the Three Months Ended June 30, 2020Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(19)
Net loss65 135 5 12 — 217 
Total recognized in net periodic benefit cost65 135 5 (7)— 198 
Recognized from accumulated other comprehensive loss/(gain) (1)
65 26 5 (7)— 89 
Recognized from regulatory asset— 109 — — — 109 
Total$65 $135 $5 $(7)$— $198 

For the Six Months Ended June 30, 2021Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(38)$— $(38)
Net loss120 310 14 18 (4)458 
Total recognized in net periodic benefit cost120 310 14 (20)(4)420 
Recognized from accumulated other comprehensive loss/(gain) (1)
120 58 14 (20)(1)171 
Recognized from regulatory asset— 252 — — (3)249 
Total$120 $310 $14 $(20)$(4)$420 
For the Six Months Ended June 30, 2020Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(38)$— $(38)
Net loss130 270 10 24 — 434 
Total recognized in net periodic benefit cost130 270 10 (14)— 396 
Recognized from accumulated other comprehensive loss/(gain) (1)
130 52 10 (14)— 178 
Recognized from regulatory asset— 218 — — — 218 
Total$130 $270 $10 $(14)$— $396 
    
(1) See Note 9, Stockholders' Equity