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Pension Plan and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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 June 30
 Pension PlanOther Benefits
 2020201920202019
Service cost$8,811  $6,565  $2,106  $1,762  
Interest cost6,433  6,642  1,210  1,337  
Expected return on plan assets(8,265) (7,567) (1,811) (1,435) 
Amortization of prior service cost1,057  1,262  49  49  
Recognized net actuarial loss3,196  1,312  14  104  
Net periodic benefit cost$11,232  $8,214  $1,568  $1,817  
 Six Months Ended June 30
 Pension PlanOther Benefits
 2020201920202019
Service cost$17,622  $13,129  $4,212  $3,524  
Interest cost12,866  13,284  2,420  2,674  
Expected return on plan assets(16,530) (15,133) (3,622) (2,871) 
Amortization of prior service cost2,114  2,524  98  99  
Recognized net actuarial loss6,392  2,624  28  207  
Net periodic benefit cost$22,464  $16,428  $3,136  $3,633