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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2019
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 (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
)
 
 
 
 
 
 
 
 

During 2019, we expect to contribute approximately $13.2 million to our pension plans.