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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2018
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,
 
2018
 
2017
 
2018
 
2017
Components of Net Periodic Benefit Cost (Income)
 
 
 
 
 
 
 
Service cost
$
3,204

 
$
3,130

 
$
112

 
$
128

Interest cost
6,108

 
6,429

 
147

 
180

Expected return on plan assets
(7,060
)
 
(6,008
)
 
(239
)
 
(213
)
Amortization of prior service cost
1

 
2

 
(471
)
 
(471
)
Recognized actuarial loss
1,072

 
1,975

 
(20
)
 
78

Net Periodic Benefit Cost (Income)
$
3,325

 
$
5,528

 
$
(471
)
 
$
(298
)

 
 
 
 
 
 
 
 

We adopted ASU 2017-07 on January 1, 2018. As a result, we recorded the non-service cost component of net periodic benefit cost within other expense, net. This standard requires retrospective adoptions, which resulted in a $2.6 million reclassification from operating, general and administrative expenses to other expense, net for the three months ended March 31, 2017, to conform to current period presentation.