XML 31 R22.htm IDEA: XBRL DOCUMENT v3.22.1
Pension Plan and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2022
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 PlanOther Benefits
 2022202120222021
Service cost$9,235 $9,010 $1,683 $1,611 
Interest cost6,329 5,319 1,008 805 
Expected return on plan assets(11,307)(9,866)(2,482)(2,192)
Amortization of prior service cost242 253 39 49 
Recognized net actuarial loss999 1,924 (228)(110)
Net periodic benefit cost$5,498 $6,640 $20 $163