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Pension Plan and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
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 Plan
 
Other Benefits
 
2019
 
2018
 
2019
 
2018
Service cost
$
6,565

 
$
7,402

 
$
1,762

 
$
2,550

Interest cost
6,642

 
5,995

 
1,337

 
1,484

Expected return on plan assets
(7,567
)
 
(6,862
)
 
(1,435
)
 
(1,416
)
Amortization of prior service cost
1,262

 
1,263

 
49

 
11

Recognized net actuarial loss
1,312

 
2,797

 
104

 
773

Net periodic benefit cost
$
8,214

 
$
10,595

 
$
1,817

 
$
3,402


 
Six Months Ended June 30
 
Pension Plan
 
Other Benefits
 
2019
 
2018
 
2019
 
2018
Service cost
$
13,129

 
$
14,804

 
$
3,524

 
$
5,100

Interest cost
13,284

 
11,989

 
2,674

 
2,969

Expected return on plan assets
(15,133
)
 
(13,725
)
 
(2,871
)
 
(2,832
)
Amortization of prior service cost
2,524

 
2,526

 
99

 
21

Recognized net actuarial loss
2,624

 
5,595

 
207

 
1,547

Net periodic benefit cost
$
16,428

 
$
21,189

 
$
3,633

 
$
6,805