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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
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 $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 8 12 (2)— 
Net periodic cost (benefit)54 69 (246)(92)19 21 (5)1 4 10 
Amortization of pre-merger regulatory asset— — — — — — — — — 2 
Total periodic cost (benefit)$54 $69 $(246)$(92)$19 $21 $(5)$1 $4 $12 

We expect to record $0.7 million in pension and post-retirement benefit for 2021. The components of our net periodic costs have been recorded or reclassified to other expense, net in the condensed consolidated statements of income. Pursuant to a Florida PSC order, FPU continues to record, as a regulatory asset, a portion of the unrecognized postretirement benefit costs related to its regulated operations after the FPU merger. The portion of the unrecognized pension and postretirement benefit costs related to FPU’s unregulated operations and Chesapeake Utilities' operations is recorded to accumulated other comprehensive loss.
The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three ended March 31, 2021 and 2020: 
For the Three Months Ended March 31, 2021Chesapeake
Pension
Plan		FPU
Pension
Plan		Chesapeake SERPChesapeake
Postretirement
Plan		FPU
Medical
Plan		Total
(in thousands)
Prior service credit$— $— $— $(19)$— $(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 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 
    (1) See Note 9, Stockholders' Equity.
During the three months ended March 31, 2021, we contributed approximately $0.1 million to the Chesapeake Pension Plan and approximately $0.4 million to the FPU Pension Plan. We expect to contribute approximately $0.3 million and $2.1 million, respectively, to the Chesapeake Pension Plan and FPU Pension Plans during 2021, which represents the minimum annual contribution payments required.
The Chesapeake SERP, the Chesapeake Postretirement Plan and the FPU Medical Plan are unfunded and are expected to be paid out of our general funds. Cash benefits paid under the Chesapeake SERP for the three months ended March 31, 2021 were immaterial. We expect to pay total cash benefits of approximately $0.2 million under the Chesapeake SERP in 2021. Cash benefits paid under the Chesapeake Postretirement Plan, primarily for medical claims for the three months ended March 31, 2021 were $0.2 million. We estimate that approximately $0.2 million will be paid for such benefits under the Chesapeake Postretirement Plan in 2021. Cash benefits paid under the FPU Medical Plan, primarily for medical claims for the three months ended March 31, 2021, were immaterial. We estimate that approximately $0.1 million will be paid for such benefits under the FPU Medical Plan in 2021.