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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net Periodic Cost (Benefit)
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2020
2019
 
2020
2019
Service cost
$
1

$
1

 
$

$

Interest cost
32

39

 
2

2

Expected return on plan assets
(54
)
(57
)
 
(1
)
(1
)
Amortization of prior service credit


 
(2
)
(1
)
Amortization of actuarial loss
15

11

 
2

1

Net periodic cost (benefit)
$
(6
)
$
(6
)
 
$
1

$
1