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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 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 31,2022202120222021202220212022202120222021
(in thousands)          
Interest cost$— $34 $449 $429 $13 $12 $6 $6 $6 $6 
Expected return on plan assets— (40)(857)(830)— — — — — — 
Amortization of prior service credit— — — — — — (19)(19)— — 
Amortization of net (gain) loss— 60 124 155 7 7 12 8 — (2)
Total periodic cost (benefit)$— $54 $(284)$(246)$20 $19 $(1)$(5)$6 $4 
Amounts Included in Regulatory asset and AOCI [Table Text Block]
The following tables present the amounts included in the regulatory asset and accumulated other comprehensive income that were recognized as components of net periodic benefit cost during the three months ended March 31, 2022 and 2021: 
For the Three Months Ended March 31, 2022Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(19)
Net loss— 124 7 12 — 143 
Total recognized in net periodic benefit cost— 124 7 (7)— 124 
Recognized from accumulated other comprehensive (income)/loss (1)
— 24 7 (7)— 24 
Recognized from regulatory asset— 100 — — — 100 
Total$— $124 $7 $(7)$— $124 
    
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 (income)/loss (1)
60 29 7 (11)— 85 
Recognized from regulatory asset— 126 — — (2)124 
Total$60 $155 $7 $(11)$(2)$209 
(1) See Note 9, Stockholders' Equity