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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] 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
)