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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans
 
We sponsor and/or contribute to pension and postretirement health care and life insurance benefit plans for eligible employees. Net periodic benefit cost (credit) for our pension and other postretirement plans consists of the following (in thousands):
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2020
 
2019
 
2020
 
2019
Components of Net Periodic Benefit Cost (Credit)
 
 
 
 
 
 
 
Service cost
$
2,846

 
$
2,497

 
$
92

 
$
89

Interest cost
5,726

 
6,629

 
109

 
155

Expected return on plan assets
(6,545
)
 
(6,362
)
 
(247
)
 
(218
)
Amortization of prior service cost (credit)
—

 
1,652

 
(471
)
 
(471
)
Recognized actuarial loss (gain)
1,280

 
—

 
(18
)
 
(24
)
Net Periodic Benefit Cost (Credit)
$
3,307

 
$
4,416

 
$
(535
)
 
$
(469
)
 
 
 
 
 
 
 
 

We contributed $1.4 million to our pension plans during the three months ended March 31, 2020. We expect to contribute an additional $10.0 million to our pension plans during 2020.