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Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2020
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s defined benefit plans were as follows (in thousands):

 
Pension Benefits
 
   
Pension Plan
   
SERP
 
   
Three months ended
September 30,
   
Three months ended
September 30,
 
   
2020
   
2019
   
2020
   
2019
 
Components of net periodic benefit cost:
                       
Service cost
 
$
1,917
   
$
1,841
   
$
   
$
 
Interest cost
   
3,919
     
4,123
     
10
     
13
 
Expected return on plan assets
   
(5,960
)
   
(5,239
)
   
     
 
Amortization of actuarial loss
   
994
     
359
     
8
     
7
 
Net periodic benefit cost
 
$
870
   
$
1,084
   
$
18
   
$
20
 

   
Pension Benefits
 
   
Pension Plan
   
SERP
 
   
Nine months ended
September 30,
   
Nine months ended
September 30,
 
   
2020
   
2019
   
2020
   
2019
 
Components of net periodic benefit cost:
                       
Service cost
 
$
5,753
   
$
5,523
   
$
   
$
 
Interest cost
   
11,758
     
12,370
     
30
     
39
 
Expected return on plan assets
   
(17,883
)
   
(15,717
)
   
     
 
Amortization of actuarial loss
   
1,651
     
1,078
     
26
     
21
 
Net periodic benefit cost
 
$
1,279
   
$
3,254
   
$
56
   
$
60
 
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s postretirement benefit plan were as follows (in thousands):

 
Other Postretirement Benefits
 
   
Postretirement Welfare Plan
 
   
Three months ended
September 30,
   
Nine months ended
September 30,
 
   
2020
   
2019
   
2020
   
2019
 
Components of net periodic benefit cost:
                       
Service cost
 
$
   
$
   
$
   
$
 
Interest cost
   
6
     
7
     
17
     
23
 
Amortization of actuarial gain
   
(131
)
   
(135
)
   
(392
)
   
(405
)
Net periodic benefit cost
 
$
(125
)
 
$
(128
)
 
$
(375
)
 
$
(382
)