Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2021

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Schedule Of Net Benefit Costs [Table Text Block]

Three Months Ended March 31, 

Other

Pension Benefits

Postretirement Benefits

2021

2020

2021

2020

Service cost

$

316

$

1,174

$

1

$

2

Interest cost

1,090

1,769

11

26

Expected return on plan assets

(2,082)

(1,959)

—

—

Settlement loss

—

22,667

—

—

Actuarial loss amortization

855

1,047

—

15

Prior service (credit) cost amortization

2

(40)

—

—

Total net periodic benefit cost

$

181

$

24,658

$

12

$

43