Pension and Other Post Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Pension Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of components of net periodic benefit costs - pension plans [Table Text Block]

Three Months Ended June 30, 

Six Months Ended June 30, 

Other

Other

Postretirement

Postretirement

Pension Benefits

Benefits

Pension Benefits

Benefits

2021

2020

2021

2020

2021

2020

2021

2020

Service cost

$

316

$

1,164

$

2

$

1

$

632

$

2,338

$

3

$

3

Interest cost

1,094

1,486

10

26

2,184

3,255

21

52

Expected return on plan assets

(2,093)

(1,761)

—

—

(4,175)

(3,720)

—

—

Settlement charge

—

—

—

—

—

22,667

—

—

Actuarial loss amortization

857

615

—

16

1,712

1,662

—

31

Prior service cost amortization

3

(41)

—

—

5

(81)

—

—

Net periodic benefit cost

$

177

$

1,463

$

12

$

43

$

358

$

26,121

$

24

$

86