Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Pension [Table Text Block]

Three Months Ended June 30,

Six Months Ended June 30,

Other

Other

Postretirement

Postretirement

Pension Benefits

Benefits

Pension Benefits

Benefits

2020

2019

2020

2019

2020

2019

2020

2019

Service cost

$

1,164

$

978

$

1

$

2

$

2,338

$

1,963

$

3

$

4

Interest cost

1,486

1,105

26

36

3,255

2,216

52

71

Expected return on plan assets

(1,761)

(978)

—

—

(3,720)

(1,962)

—

—

Settlement charge

—

—

—

—

22,667

—

—

—

Actuarial loss amortization

615

773

16

—

1,662

1,549

31

—

Prior service cost amortization

(41)

(41)

—

—

(81)

(83)

—

—

Net periodic benefit cost

$

1,463

$

1,837

$

43

$

38

$

26,121

$

3,683

$

86

$

75