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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] Net periodic benefit cost (income) 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,
 
2019
 
2018
 
2019
 
2018
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
Service cost
$
2,497

 
$
3,204

 
$
89

 
$
112

Interest cost
6,629

 
6,108

 
155

 
147

Expected return on plan assets
(6,362
)
 
(7,060
)
 
(218
)
 
(239
)
Amortization of prior service cost (credit)
1,652

 
1

 
(471
)
 
(471
)
Recognized actuarial loss (gain)
—

 
1,072

 
(24
)
 
(20
)
Net Periodic Benefit Cost (Income)
$
4,416

 
$
3,325

 
$
(469
)
 
$
(471
)