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Pension Plan and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits
The following tables list components of net periodic benefit costs for the pension plans and other postretirement benefits. The data listed under “pension plan” includes the qualified pension plan and the non-qualified supplemental executive retirement plan. The data listed under “other benefits” is for all other postretirement benefits.
 
 
Three Months Ended March 31
 
Pension Plan
 
Other Benefits
 
2020
 
2019
 
2020
 
2019
Service cost
$
8,811

 
$
6,565

 
$
2,106

 
$
1,762

Interest cost
6,433

 
6,642

 
1,210

 
1,337

Expected return on plan assets
(8,265
)
 
(7,567
)
 
(1,811
)
 
(1,435
)
Amortization of prior service cost
1,057

 
1,262

 
49

 
49

Recognized net actuarial loss
3,196

 
1,312

 
14

 
104

Net periodic benefit cost
$
11,232

 
$
8,214

 
$
1,568

 
$
1,817