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Retirement Benefits
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Retirement Benefits
Retirement Benefits
 
 
 
 
 
 
 
 
The components of net periodic benefit credit included in our consolidated statements of income for the three months ended March 31, 2020 and 2019 are as follows:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 March 31
 
Three Months Ended 
 March 31
 
2020
 
2019
 
2020
 
2019
Interest cost
$
12

 
$
16

 
$
3

 
$
4

Expected return on assets
(40
)
 
(34
)
 
(6
)
 
(5
)
Recognized actuarial loss
6

 
4

 
—

 
—

Settlement loss
5

 
2

 
—

 
—

Amortization of prior service credit
—

 
—

 
(2
)
 
(3
)
Net periodic benefit credit
$
(17
)
 
$
(12
)
 
$
(5
)
 
$
(4
)

For the year ending December 31, 2020, no material contributions are expected to be necessary to meet the Employee Retirement Income Security Act of 1974, as amended, or ERISA, required funding levels; however, we may elect to make discretionary contributions up to the maximum amount deductible for income tax purposes. No contributions were made to our retirement benefit plans during the three months ended March 31, 2020 and 2019.