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Pension Plan and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits
The following table lists 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 September 30
 
Pension Plan
 
Other Benefits
 
2018
 
2017
 
2018
 
2017
Service cost
$
6,966

 
$
6,122

 
$
1,966

 
$
2,169

Interest cost
6,007

 
5,861

 
1,183

 
1,491

Expected return on plan assets
(7,052
)
 
(6,031
)
 
(1,397
)
 
(1,218
)
Amortization of prior service cost
1,263

 
1,445

 
11

 
11

Recognized net actuarial loss
2,791

 
1,881

 
242

 
649

Net periodic benefit cost
$
9,975

 
$
9,278

 
$
2,005

 
$
3,102


 
Nine Months Ended September 30
 
Pension Plan
 
Other Benefits
 
2018
 
2017
 
2018
 
2017
Service cost
$
21,770

 
$
17,851

 
$
7,066

 
$
6,207

Interest cost
17,996

 
17,442

 
4,152

 
4,472

Expected return on plan assets
(20,777
)
 
(18,090
)
 
(4,229
)
 
(3,653
)
Amortization of prior service cost
3,789

 
4,336

 
32

 
32

Recognized net actuarial loss
8,386

 
5,386

 
1,789

 
1,947

Net periodic benefit cost
$
31,164

 
$
26,925

 
$
8,810

 
$
9,005