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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2020
Pension Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of Net Periodic Benefit Cost

Three Months Ended

Six Months Ended

June 30,

June 30,

Pension Benefits

2020

2019

2020

2019

Interest cost

$

358

$

466

$

716

$

932

Expected return on plan assets

(609)

(555)

(1,218)

(1,110)

Amortization of unrecognized net loss

140

137

280

274

$

(111)

$

48

$

(222)

$

96

Postretirement Benefit Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of Net Periodic Benefit Cost

Three Months Ended

Six Months Ended

June 30,

June 30,

Postretirement Benefit Plan

2020

2019

2020

2019

Service cost

$

-

$

5

$

-

$

10

Interest cost

-

45

-

90

Amortization of prior service cost

-

4

-

8

Amortization of unrecognized net gain

-

(97)

-

(194)

$

-

$

(43)

$

-

$

(86)