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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2020
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 nine months ended September 30, 2020 and 2019 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 September 30,2020201920202019202020192020201920202019
(in thousands)          
Interest cost$46 $104 $518 $614 $16 $16 $8 $10 $10 $12 
Expected return on plan assets(42)(127)(745)(693)— — — — — — 
Amortization of prior service credit— — — — — — (19)(19)— — 
Amortization of net loss65 101 135 128 5 17 12 11 — — 
Net periodic cost (benefit)69 78 (92)49 21 33 1 2 10 12 
Settlement expense— — — — — 58 — — — — 
Amortization of pre-merger regulatory asset— — — 162 — — — — 2 2 
Total periodic cost$69 $78 $(92)$211 $21 $91 $1 $2 $12 $14 
Chesapeake
Pension Plan		FPU
Pension Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan
For the Nine Months Ended September 30,2020201920202019202020192020201920202019
(in thousands)          
Interest cost$138 $314 $1,554 $1,844 $48 $58 $24 $29 $30 $36 
Expected return on plan assets(126)(381)(2,235)(2,079)— — — — — — 
Amortization of prior service credit— — — — — — (57)(58)— — 
Amortization of net loss195 304 405 386 15 68 36 35 — — 
Net periodic cost (benefit)207 237 (276)151 63 126 3 6 30 36 
Settlement expense— — — — — 58 — — — — 
Amortization of pre-merger regulatory asset— — — 543 — — — — 6 6 
Total periodic cost$207 $237 $(276)$694 $63 $184 $3 $6 $36 $42 
Amounts Included in Regulatory asset and AOCI [Table Text Block]
The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three and nine months ended September 30, 2020 and 2019: 
For the Three Months Ended September 30, 2020Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(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 Three Months Ended September 30, 2019Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(19)
Net loss101 128 17 11 — 257 
Total recognized in net periodic benefit cost101 128 17 (8)— 238 
Recognized from accumulated other comprehensive loss/(gain) (1)
101 24 (93)(8)— 24 
Recognized from regulatory asset— 104 — — — 104 
Total$101 $128 $(93)$(8)$— $128 
For the Nine Months Ended September 30, 2020Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(57)$— $(57)
Net loss195 405 15 36 — 651 
Total recognized in net periodic benefit cost195 405 15 (21)— 594 
Recognized from accumulated other comprehensive loss/(gain) (1)
195 78 15 (21)— 267 
Recognized from regulatory asset— 327 — — — 327 
Total$195 $405 $15 $(21)$— $594 
For the Nine Months Ended September 30, 2019Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(58)$— $(58)
Net loss304 386 (42)35 — 683 
Total recognized in net periodic benefit cost304 386 (42)(23)— 625 
Recognized from accumulated other comprehensive loss/(gain) (1)
304 73 (42)(23)— 312 
Recognized from regulatory asset— 313 — — — 313 
Total$304 $386 $(42)$(23)$— $625 
    (1) See Note 9, Stockholders' Equity